project89

iTrader: (1)

im having a really hard time tunning my idle on this motor and i dont think it should lope as bad as it does .

if i set the idle to 600 rpms it lopes from 6-1000 rpms, now i have the lowest part of the idle set to about 900/950 and it is loping to about 1100-1150

the combo is tpi intake 9.2-1 cr cam is 234° / 244°, .488" / .510" 109lsa
ive tried setting the timming anywere between 16* all the way upto 32* at ilde 32* gets me the smallest amount of lope but i dont think this cam should be loping as hard as it does

heres a lil video

http://videos.streetfire.net/video/blah2_2333530.htm
thats with the idle set up high and alot of timing


and here is a video with low idle speed and around 18* timing

its loud caus ei had a bad leak at the downpipe flange on the passengerside turbo

http://www.streetfire.net/video/blah_2333187.htm

what do u guys think should this cam have that rough of an idle?

mw66nova

iTrader: (13)

why such a huge camshaft with such a tight lsa on a turbo combo?

87_TA

I guess I have multiple questions to help eliminate the issue...
First off 650 is way low... The cam is not that big, LSA is sorta tight and not sure of total overlap, I see your overlap at .050 but that is only part of the equation, do you have .006#s by any chance? Is it HYD roller, or flat tappet? Either will usually increase overall overlap.

At target idle warmed what are your BLM? What are your IAC counts warmed in park/neutral? You say you have an exhaust leak, is it near the O2 sensor? Lastly why is there no piping from Turbo to intake - unless I missed it, but quick look at video looked like open throttle body?

Also it says your car is an 89? So are you still running 165 ECM MAF? And if still running MAF is it not on intake? from what I saw..

If scaling MAF tables or VE, makeing the surrounding areas close to that of the idle cell will help smooth thins out.. Does it idle well in open loop?

Orr89RocZ

iTrader: (20)

Its a big cam for a L98 type motor...its gonna lope. Its gonna be very picky on fueling as MAP values swing with the cam's lope. Just need to spend time dialing in the fuel curve and really give it alot of timing.

project89

iTrader: (1)

cause its what i had to use at the time,eventually it will be swaped out for a 224/224 cam

not using an iac,setting idle speed via throttle blade opening just like a carb
hyd flat its the edelbrock rpm performer cam

the second video was with trying to keep the idle low and the leak was fixed, not using o2 feedback yet on the mototr so the leak wouldnt have mattered anyway

it apears the manifold base is leaking going to strip off the manifold today and reseal it

87_TA

Well I am not sure of your tuning/ecm knowledge at this point so I don't what to tell you and what not.. I also I do not want to offend you with simple fixes, but to someone who does not know ecm's reaction to mods it is confusing..

First what ecm are you using? MAF or SD? 165/730 ecms..
If you are not using o2 - have you forced open loop or locked BLM's? If using throttle blades what is your TPS reading? Why are you not using IAC?
Any and all of these can force ecm into limp home mode, and you will never run right unless compensated for in tune.. If you are using a stock ecm and not tuning you simply can not just unplug the 02 and IAC or crank open throttle blades - at some point TPS thinks you are no longer at idle and trying to add Acceleartion enrichment.. (Pump SHot) any/all of these will cause your surge issue.. That is a larger cam, not huge by any means, probably had a good amount of total over lap, but very tunable if you have an understanding..

project89

iTrader: (1)

well i found my issues , my brand new areomotive pump is dead fp is pulsing between 15-27 psi at idle

im not using a stock ecm, im using a megasquirt 2 ive tuned many of these things.
not using an iac for simplicity, ive done multiple cars with ms and havent used an iac on any of them

87_TA

Congrats, Like I said - you gave us limited info, I did not know who or what I was dealing with.. Will MegaSquirt accept IAC? How are they to work with?

mw66nova

iTrader: (13)

make sure you call aeromotive. they have a very helpful tech department, and will fix your pump.

Pillsbry10

iTrader: (1)

the newer models of megasquirt will allow you to use IAC as well as program the fans and a few other options.

project89

iTrader: (1)

megasquirt 2 and above can use stepper or pwm iac valves,ms 1 can only use a on off type or pwm with some mods, but will not do stepper.
its easy to use the iac with the ms unit stepper motor iac takes some time to get right but its not hard.t found with some careful tunning of the cold start and warmup maps the iac isnt even needed.

it is nice to have one if u have ac though to bring idle up when the ac kicks on

going to give them a call tommorow i have 2 brand new 340LPH stealth intank pumps, im hoping they will exchange them. im going to drop the tank tommorow and pull them out as well. stupid me threw away my stock pump so i may go get a cheap 50$ pump from napa as well so i can atleast drive the car around for now

project89

iTrader: (1)

can somone check my math please

i just picked up 3 brand new zr-1 vette pumps to use temp until i get my pumps back from areomotive paid 15 bucks each pump

ok from what i can find these pumps are 190LPH
190lph = 50.1GPH
302LB/HR divided by BFSC of .62 = 480hp per pump at 43 psi

so these 3 pumps should support just shy of 1,500 hp @ 43psi of fp if the info i found on them is correct

and just to compare them to the aremotive pumps
340LPH=89.9GPH
540LB/HR divided by BFSC of .62 = 870 hp per pump at 43 psi
so both pumps should be able to support 1700 hp

granted hp able to be supported will drop as pressure goes up unfortunatly i cant get a flow sheet for the zr-1 pumps

(Liters per Hour) / 3.785 = Gallons
Multiply by 6.009 = LBS/HR
Divide by BSFC = Horsepower Capacity
So for a 190 LPH fuel pump:
190 / 3.785 =50.19 Gallons
50.19 x 6.009 = 301.64 LBS/HR
301.64 / 0.62 = 486.51 “Horsepower Capacity”

vwdave

I know youve found your answer, Im just posting for a point of reference.

224*/230* .575" lift, I think 112+ LSA. I set the timing to 17* initial, idle at 900 and A/F at 14.9-15.0 and while it chops, the idle never fluctuates. Still pull 12" of vacuum also. AC is cold and brakes still work as they should.

project89

iTrader: (1)

i ended up swaping out the cam for someth8ing much more turbo friendly
summit 224/224

car idles like stock now

http://www.streetfire.net/video/blah-blah_2340619.htm