That's what the 411 guys use right?

I'd probably use it if I had a stock LSx vehicle.

I almost bought a C5 but the electronics scare me. Too much crap breaks on those.

-- Joe

 

Yea I run HpT pro on my stock boosted 5.3. Works very well and the pro is setup for datalogging. They are even kind enough to provide MAF boosted, 2 & 3 BAR MAP base OP systems for you to choose from.

You can run the LSX style PCMs on different motors from what I've seen.

 

The OPs cam is not a good match for forced induction. Not even turbos. But if he has it, run it, just means he's leaving power and drivability on the table. With turbos you want no overlap, otherwise the exhaust (which is under pressure from the turbo) will revert back into the intake during overlap, thus displacing good fresh air that gets sucked back into the cylinder just to get reburned. I don't have the means to verify how much overlap but once you have overlap it negatively affects power on a forced induction setup. If you were running a blower you'd want more exhaust duration and a much higher love, positive displacement like even more exhaust duration and high lobe. Turbos don't need it as the turbo needs the pressure... but no overlap.

 

I run a 1mb 6243 ecu coil over plug true mpfi w/ my h/c/I turbo gen I sbc . You can run any gen 3/4 ecu with SBC gen1 or LT1/4 gen 2 not only the 0411.
HP tuners is great , you can still pass emissions with radical combos as long as your able to pass a sniff test.
Best thing is its not limited to just one vehicle. I use it on my jeep also.

 

i have more intake pressure then ex pressure it doesnt matter , like i said when u have a free flowing hotside u can run a cam more suited to n/a

 

Ya im sure you me and 1000s of other guys could do better with something other than off the shelf grinds. Its pretty hard to choose a cam that doesnt make power with a turbo. 95 out of 100x if its good na itll be great FI.

 

i was going to get a custom cam ground but i didnt have the time to wait , this cam is small and lil overlap compared to the cams i used to run int he v6 motors , it will make power just fine

infact hotrod or one of those guys did back to back testing with turbo cams vs the (wrong cams) for turbo and the wrong cams worked just fine


a turbo cam made flatter power , while the wrong cams made more power but was much peakier

 

http://www.hotrod.com/articles/ctrp-...amshaft-guide/

I think this is the article you are referring to. An interesting read.

Turbos are strange things.

-- Joe

 

You can always fix that with advancing the camshaft if p2vc allows it thats what I did. It was the best suited cam off the shelf for me but the peak power range was to high in the rpm.
I new I was going to go with comp so I used there software punching what was as close as possible to my combo and came up with the 280xfi + 2 degrees advanced ontop of there 4.
They sure are,
Thanks for the link. It will give me something to read tonight tricker treating with the family

 

thats not it but it gets to the point

 

the injectors fixed it , i have one reset when i let go of the starter button and thats it

starts up ,runs and doesnt stall oyut anymore randomly

thank you joe

 

Cool. Drive the car, enjoy it. Resume tinkering in the spring.


-- Joe

 

i need to adress another issue first , gota get my hands on a leakdown tester though a compression tester should work as well .

rember when i bent those pushrods due to to long of intake bolts , well i have this backfire in the ex system, i think maybe i may have kissed a valve with a piston during that time .

the odd thing is it goes away as the motor warms up

anywich way i only need to check 2 cyls so it shouldnt take long to find out, it could also be another autolite plug going out as it doesnt do it constantly its completly random if it was a valve u would think it would pop every cycle


im actually going to take out for a spin friday then drop it off at the shop so i can work on the rear end swap

 

joe any idea on the dead time on those injectors or voltage offsets?

not really a ig deal but having that info would save me some tinkering lol

 

This is how I had them set up:





Remember, the MS uses a magical dead time calculation that is not based on reality. Other ECU's may do the same thing, I don't recall, but the MS only asks you about "dead time" not "open time" followed by "Close time", so I don't know how the *!#@ it calculates using just this magical dead time number, which seems to want to be smaller than the actual "open time" number provided by the injector manufacturer.

(I've seen the MS experts try to explain it on the forums, but they contradict themselves in doing so often)

Coil Resistance: 12.5 Ohms / High Impedance / High-Z (No ECM driver modifications required)
Static Flow Rate @ 43.5PSI ( 300kPa ) w/Gas: 60 lb/hr = 630 cc/min = 453 g/min
Static Flow Rate @ 87PSI ( 600kPa ) w/Gas: 85.7 lb/hr = 900 cc/min = 648 g/min
Gain: 0.11ms/mg
Offset: 0.055ms
Turn on time @ 14VDC: 1.14ms
Turn off time: 0.85ms @ 600KPa

-- Joe

 

Bingo. I learned that from Bison over on Turbo Buick...

We don't even get a freaking idle video from him Joe lol...

 

lol theres enough of those , ive gota do some retuning before i take it out again still

 

looks liek my missfire is a plug swaped the plugs in the motor side to side and the miss follwoed the plugs i think im just going to break down and pay the 6.50$ a piece for the ngk's this time , the autolight ar2923 have been a thorn in my side about as bad as the low-z injectors

 

NGK R5671A-8 $15.00 on ebay.

 

BTW those autolites foul out very easily........one of the reasons I switched to ngk.

 

thank you ,,

yup these things are fouling out so damn easy , 1-2 tests on the launch control or hit the 2 step and they are fouled

since my traction control functions something like a 2 step it fouls them out on that as well

 

Mine would foul out very easily...got tired of it. Switched to NGk and haven't had any issues.

 

tell me about it lol 1 trip to the drag strip and 75-100 street miles and this will be set number 3 or maybe even 4 , deffinatly over it


need to take my buddy out for a ride in the car this weekend and try to convince him to build the virgin gm rocket block he has , hes big into diesel stuff but not gas stuff, hes got 2x cummin's builds going right now , ones a 4cyl into a chevy 2500 and the other is a 6cyl with compound turbos and all the goodies going into a gm crew cab/long bed 2500 iirc on the truck

 

its alive again and doing well thanks again joe i cant thank ya enough

 

home for lunch , started the car up , let her run for 45 mins just sitting outside idling , not one hiccup out of the ecm/motor , im actually excited about the damn car again

did manage to take it for a drive yesterday really fast and it seems like i just need to fine tune the ae , and the 3-8 psi psi range of the table a bit and i should be good to go


joe what was that adapter u used for the iac , im getting a lil stalling here and there with the trans in gear hopefully a lil more ignition timing will cure it but if not im going to have to install and iac on this


btw anyone want some precision turbo low-z injectors going to put them up for sale on here and yb , they ohm out fine they were just to much for the ms ecm

 

I'm running a PWM->stepper adapter on my microsquirt module. So in my software IAC is represented in percentage rather than steps.

Your Ms2 should drive a 4 wire IAC as is. You need to verify the wiring though.

-- Joe

 

ms1 currently so yeah thats why i wa sinterested in the pwm to stepper adapter

 

Don MacPhail :
TTR Ignition Systems
www.ttrignition.com

Email him. I suspect it will work with MS1 if it's got a fidle.

-- Joe

 

thanks yeah it has a fidle, if i can find were i put my ms2 cpu maybe ill put it back in , but i honestly dont want to mess with it since its running good now

 

My cold start and warmup are completely pooched now with the new injectors. Gotta tune it out.

Tuning cold start sucks because once the motor is warm you are done for the day.

-- Joe

 

its not to bad when the motors cold i just have to hold the idle up around 1500 for 10-15 seconds and then the car will idle on its own , then i just let the motor warm up for a few more mins and i can drive it .

im never in that much of a rush were i need to hop in hit the key and go


first thing on my list is fixing the fuel level sending unit , or my pump setup i ran out of gas yesterday pulling into the driveway damn gauege still says i have a 1/4 tank , so either my fuel pumps arent low enough in the tank or i bent the float rod when i put the pumps in

 

How much advance are you running at idle?

I started mine the other day. It caught and died. Caught and died. Then caught and idled. I couldn't move it for a minute or two. Even little throttle movements caused it to stumble.


-- Joe

 

im around 32-35* at idle

when i started it yesterday it fired and died the very first time , but the second time it was fine


if its stumbling cold u may need to increase or decrease ur cold ae multplier , more then likley u need to increase it

 

were supposed to hae some mid 60 to low 70* days today and for the next few days going to try to get the car out inbetween work and everything else .


would be nice to go out on a cruise once before i bring the car back to the shop for a repaint and rear swap over the winter, i think the only other thing i actually need to do the car this winter is take the trans out and go threw it .

its actually nice to have such a short list of things to do to the car

 

You guys run **** ton of advance at idle. Im at 9* over here. +1 on the AE cold multiplier. I had to double my AE when i put the blower on, and add roughly 20% to the cold number.

 

i tried to get idle ignition timming way down but the motor just wouldnt run right , now that i have swapped injectors things may be different , so ill give it another shot


but the motor runs great with that much timing at idle so who knows

 

Unless I'm on drugs, I still have your tune saved on my computer. It says 15 degrees of initial, and the table shows 16 degrees in the idle area (so 16 degrees if your initial is really 15) ???

My Corvette stock runs a ton of advance at idle:




I've verrified it with the scanner, it idles around 30-32 degrees.




-- Joe

 

joe did u throw away all those modified pistons for ur th350?

 

Yes.

-- Joe

 

Ok, that's dumb.

Explains why my AE is totally pooched after going to smaller injectors.

-- Joe

 

damn i wanted to see if u could take some measurements for me .
though it may not be needed i was able to find the spare presure plates i had laying around today , one might be thick enough to make up for the slightly excessive clearance in the low rev pack

need to figure out how im going to plumb in the nitrous nozzles in the intake no room on the sides , so that means either a spacer plate under the plenum , or plumbing it in under the intake.
might be enough room to do it in the center for the center 4 runners , 2 in the front by the thermostat housing for the front 2 runners , and if theres enough room by the distributor i could put those back there but i bet the lines would be a nightmare to bend up for that

 

Why are you putting nitrous on it ?

-- Joe

 

cause ive had this kit here forever , going to use it to spool up a big turbo.

 

You are going to blow the car up haha.

-- Joe

 

im not scared , i dont expect the nitrous to be on long at all to spool up a pt88

 

What ever happened to the s475

 

needed money at the time ,,,,
we got our first snow storm over night so its time to take the car and park it in the shop for the winter , probably be mid/late feb before it starts getting nice enough to play with it again , so that gives me a decent bit of time to do some of the things i need to do on the car

 

You guys got weird weather.

Feb is the worst for snow here. Usually snows until early April.

-- Joe

 

it can snow well into march even april and this town has even goten snow in july before

i live in the high cold desert , the weather is always ****ed up

it was 70* out 2 days ago , will be 10* tom morning ith a high in the 30's, and next week we will be back into th 60's

 

picking up a relay board and cable form joe on tuesday , should clean up the engine wiring alot , will be my first time using one of the relay boards for an ms

it was 65* out yesterday so i decided not to take the car into the shop for the winter just yet not sure ill get to do much with it this week hopefulyl the weather will stay inthe 60's for 2 weeks though as id like to get the car out for one nice long drive before i take it in for winter