Single turbo 352 iroc 1000hp or bust the grand finale
#1301
Re: Single turbo 352 iroc 1000hp or bust the grand finale
85# injectors are good for like 1200hp.
#1302
Re: Single turbo 352 iroc 1000hp or bust the grand finale
Motors vary depending how efficient
I'm using wheel hp and relating back to crank because thats all i can measure. I was 79% dc at 640 whp on my 9.86 at 141 run on my old turbo setup. That was 11.2 air fuel and 80lb siemens.
Thats about 0.63 bsfc but it was richer than ideal. I wanted 11.6-11.7 air fuel but got 11.2-11.3
My last build estimated at 1450 flywheel maxed out 127 lb inj at 46 psi base pressure which makes them closer to 113 lb.
96% dc, puts bsfc at 0.60 on 110 gas which has a leaner stoich than pump
Generally .6 is fine. But you want dc around 80 so you can have margin for overboost protection and failsafes
I'm using wheel hp and relating back to crank because thats all i can measure. I was 79% dc at 640 whp on my 9.86 at 141 run on my old turbo setup. That was 11.2 air fuel and 80lb siemens.
Thats about 0.63 bsfc but it was richer than ideal. I wanted 11.6-11.7 air fuel but got 11.2-11.3
My last build estimated at 1450 flywheel maxed out 127 lb inj at 46 psi base pressure which makes them closer to 113 lb.
96% dc, puts bsfc at 0.60 on 110 gas which has a leaner stoich than pump
Generally .6 is fine. But you want dc around 80 so you can have margin for overboost protection and failsafes
#1303
Re: Single turbo 352 iroc 1000hp or bust the grand finale
Staged injectors isnt easy to do. Gotta fab up an intake that has room for dual rails or 2 inj per runner and then an advanced efi system required. However over 1000 hp you kinda need decent efi system anyway
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Re: Single turbo 352 iroc 1000hp or bust the grand finale
New tech of these injectors work extremely well. 200-220 lb stuff is working well now, high z.
Staged injectors isnt easy to do. Gotta fab up an intake that has room for dual rails or 2 inj per runner and then an advanced efi system required. However over 1000 hp you kinda need decent efi system anyway
Staged injectors isnt easy to do. Gotta fab up an intake that has room for dual rails or 2 inj per runner and then an advanced efi system required. However over 1000 hp you kinda need decent efi system anyway
-- Joe
#1308
Re: Single turbo 352 iroc 1000hp or bust the grand finale
Fic bosch 127
https://fuelinjectorconnection.com/p...high-impedance
https://fuelinjectorconnection.com/p...high-impedance
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Engine: 3xx ci tubo
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Re: Single turbo 352 iroc 1000hp or bust the grand finale
New tech of these injectors work extremely well. 200-220 lb stuff is working well now, high z.
Staged injectors isnt easy to do. Gotta fab up an intake that has room for dual rails or 2 inj per runner and then an advanced efi system required. However over 1000 hp you kinda need decent efi system anyway
Staged injectors isnt easy to do. Gotta fab up an intake that has room for dual rails or 2 inj per runner and then an advanced efi system required. However over 1000 hp you kinda need decent efi system anyway
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Engine: 3xx ci tubo
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Re: Single turbo 352 iroc 1000hp or bust the grand finale
What confuses some of the GM thirdgen guys in terms of injector firing strategies is the ECM used. A GM 730 does single fire mode with the single injector driver it contains. It sprays all 8 injectors every 2 crank revs. Using this mode the end user will find the engine idles rougher and they decide this mode sucks. They associate this with alternating bank fire which it is not. Using the 749 or 427 ECM allows alternating bank fire scheme which is much much better.
Alternating bank fire starts spraying 4 injectors every crank rev which gives a smooth idle and has a "cycle/spray time" of 2 crank revs.
Open/close time is ECM dependent. If an ECM applies a larger voltage with less resistance then they can turn on faster. If the ECM does a short to ground at turn off with 0 resistance they will turn off faster than something with 100 ohms resistance. Most people don't understand that the ECM hardware dictates turn on/off times. The injector manufacturer should post the inductance and resistance of the winding, not turn on/off times. People mis use this in setting up the tune and correct for the error they induced with messing with the VE or load tables.
Alternating bank fire starts spraying 4 injectors every crank rev which gives a smooth idle and has a "cycle/spray time" of 2 crank revs.
Open/close time is ECM dependent. If an ECM applies a larger voltage with less resistance then they can turn on faster. If the ECM does a short to ground at turn off with 0 resistance they will turn off faster than something with 100 ohms resistance. Most people don't understand that the ECM hardware dictates turn on/off times. The injector manufacturer should post the inductance and resistance of the winding, not turn on/off times. People mis use this in setting up the tune and correct for the error they induced with messing with the VE or load tables.
Last edited by junkcltr; 08-24-2016 at 10:12 AM.
#1311
Re: Single turbo 352 iroc 1000hp or bust the grand finale
I have run the 80's and 127's (i think) on code $59 with 730 ecm and worked fine for me. I do think the sequential is alittle bit smoother running but then again, i spent more time on the tune for drivability than when i had 730 ecm with the 127's. I have to check notes to see when i made the change. That system was only running for a few months before i had the heads redone and moved to shaft rockers and 411 pcm
Last edited by Orr89RocZ; 08-24-2016 at 10:30 AM.
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Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: Single turbo 352 iroc 1000hp or bust the grand finale
I have run the 80's and 127's (i think) on code $59 with 730 ecm and worked fine for me. I do think the sequential is alittle bit smoother running but then again, i spent more time on the tune for drivability than when i had 730 ecm with the 127's. I have to check notes to see when i made the change. That system was only running for a few months before i had the heads redone and moved to shaft rockers and 411 pcm
Even with a huge over lap cam and high cube sbc the math says it was a "bad configuration, but yeah it would run at idle for short bursts. Run the numbers for the amount HP you were spraying fuel for at idle with 127 injectors. Does that HP number at idle make sense?
Yes, you could sneak by with the 80 injectors with a rough idle.
There was a reason you dumped that 730 ECM for the 411 PCM. We both know a 106mm turbo can be installed on a GEO 3 cylinder but is a "bad configuration".
EDIT: mute point on asking for AFR with 127 injectors. Large over lap cam will pump O2 into the exhaust at idle so it will false read on the lean side. So the real rich AFR will report on the WBO2 as leaner. Yeah, it will run with 127 injectors, but the quality is in question.
Last edited by junkcltr; 08-24-2016 at 11:01 AM.
#1313
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
dead time on my injectors is .85-.9ms, they are also peak and hold injectors. i.e ecm applies full voltage to snap them open , and then uses pwm to use like 6 volts to keep them held open
Last edited by project89; 08-24-2016 at 10:58 AM.
#1314
Re: Single turbo 352 iroc 1000hp or bust the grand finale
Could you post the wideband AFR reading at idle? I bet it wasn't higher than 9 AFR.
Even with a huge over lap cam and high cube sbc the math says it was a "bad configuration, but yeah it would run at idle for short bursts. Run the numbers for the amount HP you were spraying fuel for at idle with 127 injectors. Does that HP number at idle make sense?
Yes, you could sneak by with the 80 injectors with a rough idle.
There was a reason you dumped that 730 ECM for the 411 PCM. We both know a 106mm turbo can be installed on a GEO 3 cylinder but is a "bad configuration".
EDIT: mute point on asking for AFR with 127 injectors. Large over lap cam will pump O2 into the exhaust at idle so it will false read on the lean side. So the real rich AFR will report on the WBO2 as leaner. Yeah, it will run with 127 injectors, but the quality is in question.
Even with a huge over lap cam and high cube sbc the math says it was a "bad configuration, but yeah it would run at idle for short bursts. Run the numbers for the amount HP you were spraying fuel for at idle with 127 injectors. Does that HP number at idle make sense?
Yes, you could sneak by with the 80 injectors with a rough idle.
There was a reason you dumped that 730 ECM for the 411 PCM. We both know a 106mm turbo can be installed on a GEO 3 cylinder but is a "bad configuration".
EDIT: mute point on asking for AFR with 127 injectors. Large over lap cam will pump O2 into the exhaust at idle so it will false read on the lean side. So the real rich AFR will report on the WBO2 as leaner. Yeah, it will run with 127 injectors, but the quality is in question.
I have plenty of vids of the car running those injectors. It may seem they are large and would not run idle well, but they do.
I know guys running these on 4 bangers
The 411 was to gain better fuel control and ease of tuning. I was having problems with getting chips to burn cleanly and had a ecm issue where sometimes a hard bump would shut car off lol 411 did seem to improve tuning ease and did seem to offer good driving tuneability but i had no complaints when car was 730
#1315
Re: Single turbo 352 iroc 1000hp or bust the grand finale
This is probably why on some aftermarket systems people are seeing richer AFR's when the DC goes above 100% (and the dead time is discarded). I believe on my siemens injectors that dead time accounts for something like 10.25% of the duty cycle reported.
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
my pull and save backup engine lmao
and what has been my own hell the last few days ( gm 2.4 twin cam engine ) had to rop the cradle out of an alero , so i could get the trans for another alero , and the head off the motor for a gran prix , really shitty job
and what has been my own hell the last few days ( gm 2.4 twin cam engine ) had to rop the cradle out of an alero , so i could get the trans for another alero , and the head off the motor for a gran prix , really shitty job
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Car: 89 RS 89 iroc 87 firebird
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Re: Single turbo 352 iroc 1000hp or bust the grand finale
pumpgas 91 to vp 114 = 2.5 point drop in afr ????
just went out to play with the car and after putting in some vp 114 now the car is running pig rich? nothing has changed except that its 65* outside instead of 95-105*
i need to go out and pick up my laptop from the shop so i cant really see whats going on witht he sensors atm
is it even possible for vp114 to make the car run that much richer ?
im thinking maybe my ait sensor went out and its just adding extra fueling
just went out to play with the car and after putting in some vp 114 now the car is running pig rich? nothing has changed except that its 65* outside instead of 95-105*
i need to go out and pick up my laptop from the shop so i cant really see whats going on witht he sensors atm
is it even possible for vp114 to make the car run that much richer ?
im thinking maybe my ait sensor went out and its just adding extra fueling
#1319
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
thanks i didnt think it would make that huge of a difference but last time i ran it it was a mix of vp and pump gas, musta had more pump gas in the tank then i thought i did
i never grabbed my laptop just didnt have the time maybe ill get to it today on sunday
#1320
Re: Single turbo 352 iroc 1000hp or bust the grand finale
Originally Posted by project89
... and what has been my own hell the last few days ( gm 2.4 twin cam engine ) had to rop the cradle out of an alero , so i could get the trans for another alero , and the head off the motor for a gran prix , really shitty job
Originally Posted by project89
i never grabbed my laptop just didnt have the time maybe ill get to it today on sunday
#1321
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
dyno is planned but im still trying to save up to grab that ms2 setup from joe first , i do not trust my ecm so i want to replace it before i really start beating on the car
#1322
Re: Single turbo 352 iroc 1000hp or bust the grand finale
What is Joe running then, MS3 or Microsquirt? This is why I always hesitated with MegaSquirt, and why after all these years I still prefer the GM stuff over anything else. Features never really sold me, I just wanted reliability. Am still new to the whole W-Body thing, but already I now see that GM used the exact same PCM to control my L27 that they did with the L67, just different MAF and larger injectors. Talk about a breeze to make my Regal boosted. Was actually going to go Megasquirt with it, but she's only going to see 350 horsepower, if even that, so the stock PCM is staying. I want the engine to last for the next guy, so I am not going to jeopardize anything. This car actually came with an AC delete pulley for the series 1 3800, so much room down there, I'm thinking a turbo setup similar to the 4G63 with the turbo flange on the bottom. Still considering the supercharger from a '95 Riviera option, but I am not sure on the pulleys, plus the turbo would be easier believe it or not. Almost got my hands on an SL2 Saturn because of you the other day lol, I have since heard crazy things about that engine...
Anyways any idea on when your getting that MS2 from Joe...?
Anyways any idea on when your getting that MS2 from Joe...?
#1323
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Car: 86' IROC
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Re: Single turbo 352 iroc 1000hp or bust the grand finale
What is Joe running then, MS3 or Microsquirt? This is why I always hesitated with MegaSquirt, and why after all these years I still prefer the GM stuff over anything else. Features never really sold me, I just wanted reliability. Am still new to the whole W-Body thing, but already I now see that GM used the exact same PCM to control my L27 that they did with the L67, just different MAF and larger injectors. Talk about a breeze to make my Regal boosted. Was actually going to go Megasquirt with it, but she's only going to see 350 horsepower, if even that, so the stock PCM is staying. I want the engine to last for the next guy, so I am not going to jeopardize anything. This car actually came with an AC delete pulley for the series 1 3800, so much room down there, I'm thinking a turbo setup similar to the 4G63 with the turbo flange on the bottom. Still considering the supercharger from a '95 Riviera option, but I am not sure on the pulleys, plus the turbo would be easier believe it or not. Almost got my hands on an SL2 Saturn because of you the other day lol, I have since heard crazy things about that engine...
Anyways any idea on when your getting that MS2 from Joe...?
Anyways any idea on when your getting that MS2 from Joe...?
#1325
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
i wouldnt say im having a failure , i would just say that the used self built unit i bought was a pile of **** when i got it , it was missing key compnents and stuff
even though its running good now i dont trust the unit , never buy a used unit unless u know the person selling it.im going to put the unit in my car now on my turbocharged lsr bike , as the carb on it just isnt working out well , i can only get the thing to go wot , it wont idle or run part throttle worth a damn witht he carb on it
only reason im buying the unit from joe is 1 i trust him , bought my ultrabell/transcase and transbrake vb from him, #2 the unit he has is one of the smd units not one u assemble yourself
should hopefully be picking that unit up next week sometime , finally got caught up on bills
even though its running good now i dont trust the unit , never buy a used unit unless u know the person selling it.im going to put the unit in my car now on my turbocharged lsr bike , as the carb on it just isnt working out well , i can only get the thing to go wot , it wont idle or run part throttle worth a damn witht he carb on it
only reason im buying the unit from joe is 1 i trust him , bought my ultrabell/transcase and transbrake vb from him, #2 the unit he has is one of the smd units not one u assemble yourself
should hopefully be picking that unit up next week sometime , finally got caught up on bills
Last edited by project89; 08-31-2016 at 12:08 PM.
#1326
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Re: Single turbo 352 iroc 1000hp or bust the grand finale
I was thinking about doing a MS3 upgrade on it since it's a 3.57 board and just hold onto it for a future LSx project before you said you needed it.
With that said the more I interact with people on the forums about tuning, the more I realize why people have issues with the MS stuff. Even with my IAC problem I had the other day (which was a wiring issue), when I ask direct questions on the forums very few people actually knew the answers. When trying to compare IAC settings with a stock bin in tunercat it's absolutely impossible because the stock code doesn't have even 10% of the IAC options, so between not knowing what values to use, and screwing the pooch on the wiring it's quite easy to screw it up.
The GM stuff "just works" because it's already programmed to work for these engines, these sensors, these wiring harnesses.
When I changed the IAC I swapped two wires and it totally ruined my day.
And for a little while even I was about to blame MS code or Tunerstudio, when it was just an idiot wiring it. MS is not for idiots.
-- Joe
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
lol idiots get it right on the first try too , my very very first ms install and tunning took 1 try to wire and 3 hours to tune
street helped me with it and can vouch for that , i was a total noob to wiring back then and i didnt screw a darn thing up
street helped me with it and can vouch for that , i was a total noob to wiring back then and i didnt screw a darn thing up
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Re: Single turbo 352 iroc 1000hp or bust the grand finale
Guys who use stock or EBL, like 90% of the tune is done for them by GM. All they really need to do is set the injector constant, adjust the ve and spark tables and maybe a few constants here and there for fine tuning.
On the MS you literally have to make sure every single feature is configured properly for the sensors and engine you are using.
I asked Matt Cramer once about 4 years ago if he was interested in doing a PNP unit for TPI/TBI cars using the Delphi 56 connector (like I did mine) and he said there was zero demand for it and it wasn't worth the R&D time.. That's too bad.
There is no question using the MS makes you smarter and more aware of every component of your system.
-- Joe
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
pt 80 or pt 7675 ????
i think thats the route im going this winter
i think thats the route im going this winter
#1331
Re: Single turbo 352 iroc 1000hp or bust the grand finale
Running a Megasquirt doesn't make you a better tuner, from my experience with them it just makes you that much more aware of the hardware involved, and how it all works in conjunction with one another. You're not just fine tuning a vehicle with Megasquirt, you're essentially creating your own operating system in a sense, which really isn't for everyone.
As a project, sure, Megasquirt can be quite the learning experience, and although I give Junkcltr a hard time every now and then, fact is when I read what he says about the system it makes perfect sense, as he has taken the time to seriously delve into it and figure it all out. Most guys just want to turn the key and go have fun on a Friday or Saturday night though, pick up their girlfriends, go race, or go hang out with their friends and not have to worry if the engine will start or not. Most care little with how it all works, they just want it to work. The GM "stuff" works though, and you will rarely, if ever, see someone buy a new GM and pull the PCM out in favor for something else, it is unheard of, and that is because the new GM systems are superior...
7675 ftw...
As a project, sure, Megasquirt can be quite the learning experience, and although I give Junkcltr a hard time every now and then, fact is when I read what he says about the system it makes perfect sense, as he has taken the time to seriously delve into it and figure it all out. Most guys just want to turn the key and go have fun on a Friday or Saturday night though, pick up their girlfriends, go race, or go hang out with their friends and not have to worry if the engine will start or not. Most care little with how it all works, they just want it to work. The GM "stuff" works though, and you will rarely, if ever, see someone buy a new GM and pull the PCM out in favor for something else, it is unheard of, and that is because the new GM systems are superior...
Originally Posted by project89
pt 80 or pt 7675 ????
#1335
Re: Single turbo 352 iroc 1000hp or bust the grand finale
Guys who use stock or EBL, like 90% of the tune is done for them by GM. All they really need to do is set the injector constant, adjust the ve and spark tables and maybe a few constants here and there for fine tuning.
#1339
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
real pt80 , im not opposed to the bw but a billet wheel s480 is exspensive compared to the pt80
theres also another option, theres some companys out there doing really interesting holset hybrid turbos which are priced relatively well
theres also another option, theres some companys out there doing really interesting holset hybrid turbos which are priced relatively well
Last edited by project89; 09-02-2016 at 03:25 PM.
#1341
Re: Single turbo 352 iroc 1000hp or bust the grand finale
Originally Posted by project89
i think its going to be the pt80 as i can get them stupid cheap
On a side note, go to get the Regal inspected and they told me no longer needed, not even a visual is needed, no sticker in the window whatsoever needed anymore from '95 down lol. Heh, now I'm looking at the GTA and thinking "hmm, a 454 BBC would fit nice in there" lol, but I'm sticking with the 305... for now.
#1343
Re: Single turbo 352 iroc 1000hp or bust the grand finale
Originally Posted by project89
got tierd of the paint company waiting to get back to me so i took matters into my own hands , so far the results look positive
paint looks good...
#1347
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
if i have to reapint its not going to be that green its either going to be a
green - blue flip flop
or a chemelon
#1348
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Car: 89 RS 89 iroc 87 firebird
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Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
btw joe i went back threw my ms settings today , and for whatever odd reason i was running 2 squirts simultaneously, so i switched it to 2 alternating , and the idle actually cleared up a good bit
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Re: Single turbo 352 iroc 1000hp or bust the grand finale
There is no question that alternating fixes the idle pulsewidth issues and makes it idle better, however everything I'm reading says it's a **** idea under boost because the fuel is going to move around in the intake and go where the valves are open, not puddle on the back of a closed valve like on a n/a motor.
Ideally, it would do alternating at idle and switch to simultaneous when the pulsewidths cross a threshold (kinda like how $58 does it). But when I asked James he basically told me to **** off, and write it myself.
When you have a chance, email me a idle log. Curious how yours is running. Right now I'm running 2/alt and I'm seeing between 3.8-4 msec idle pulsewidths at 900rpm and 60 kpa.
I tried putting the car in storage last week, but I could barely stop it. I almost rolled out into the street. Long story short, new non-low drag calipers, different size master and I think that is cured. Got pissed off while waiting for parts, ripped the trans cooler off and mounted a FMIC. Started plumbing it. Ripped the exhaust off, rewelded all the joints. Fixed a few leaks, moved the wideband to the merge. Moving the trans cooler.
Then I need to figure out how to fabricate my blower to draw from my ram-air hood.
By next weekend it should be back up and running again.
My poor '75 Stingray is sitting out in a field. The grass is so high around it you can barely see the roof of the car.
-- Joe
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Single turbo 352 iroc 1000hp or bust the grand finale
I've been going back and forth between both.
There is no question that alternating fixes the idle pulsewidth issues and makes it idle better, however everything I'm reading says it's a **** idea under boost because the fuel is going to move around in the intake and go where the valves are open, not puddle on the back of a closed valve like on a n/a motor.
Ideally, it would do alternating at idle and switch to simultaneous when the pulsewidths cross a threshold (kinda like how $58 does it). But when I asked James he basically told me to **** off, and write it myself.
When you have a chance, email me a idle log. Curious how yours is running. Right now I'm running 2/alt and I'm seeing between 3.8-4 msec idle pulsewidths at 900rpm and 60 kpa.
I tried putting the car in storage last week, but I could barely stop it. I almost rolled out into the street. Long story short, new non-low drag calipers, different size master and I think that is cured. Got pissed off while waiting for parts, ripped the trans cooler off and mounted a FMIC. Started plumbing it. Ripped the exhaust off, rewelded all the joints. Fixed a few leaks, moved the wideband to the merge. Moving the trans cooler.
Then I need to figure out how to fabricate my blower to draw from my ram-air hood.
By next weekend it should be back up and running again.
My poor '75 Stingray is sitting out in a field. The grass is so high around it you can barely see the roof of the car.
-- Joe
There is no question that alternating fixes the idle pulsewidth issues and makes it idle better, however everything I'm reading says it's a **** idea under boost because the fuel is going to move around in the intake and go where the valves are open, not puddle on the back of a closed valve like on a n/a motor.
Ideally, it would do alternating at idle and switch to simultaneous when the pulsewidths cross a threshold (kinda like how $58 does it). But when I asked James he basically told me to **** off, and write it myself.
When you have a chance, email me a idle log. Curious how yours is running. Right now I'm running 2/alt and I'm seeing between 3.8-4 msec idle pulsewidths at 900rpm and 60 kpa.
I tried putting the car in storage last week, but I could barely stop it. I almost rolled out into the street. Long story short, new non-low drag calipers, different size master and I think that is cured. Got pissed off while waiting for parts, ripped the trans cooler off and mounted a FMIC. Started plumbing it. Ripped the exhaust off, rewelded all the joints. Fixed a few leaks, moved the wideband to the merge. Moving the trans cooler.
Then I need to figure out how to fabricate my blower to draw from my ram-air hood.
By next weekend it should be back up and running again.
My poor '75 Stingray is sitting out in a field. The grass is so high around it you can barely see the roof of the car.
-- Joe
i wanna say it was 2.4msec on alt and was in the mid 3's on simul