ok so here it is.....

gsvt · Jul 13, 2004

i just finished dropping the 4.6 2v (01') into my car. I also have the saleen routes type supercharger bolted on with the heat exchange ... The trans is out of a 99 cobra with a dual friction centerforce clutch. The car is up and running well... EXCEPT..... I have a small problem. The car revs well and runs well when not in gear. I can push the pedal to the ground and get a smooth acceleration of the motor. Well when the engine is in gear for example first... it does not do that. The engine hesitates or studders from idle to about 2700 - 3000 rpm. It's odd because this is only when the car is in gear. I thought that it would do it all the time. Well what the car does is hesistate and run rough through those rpm. It has trouble moving through those rpm and when it get out of them.. it revs a lot cleaner. I'm not sure if the engine is running too rich or too lean. My guess is too lean because of the supercharger. Also to add to this incase someone has an idea what is going wrong... I do not have the pvc or egr system... they are blocked off. Well I bought a computer from someone that was supposevely from a 99 saleen s281.. it had the saleen factory sticker and information. Anyone have an idea what is going wrong? or better yet.. how to fix the problem. please help

Eric

stangman · Jul 13, 2004

if i were you i would get it to a tuner & on the dyno asap. cause with that new setup, i'm sure you would hate to see it messed up. good luck with it man

btw- check your plugs to see if you are running that lean

ScottLuscombe · Jul 13, 2004

Well, it's pretty obvious it's a tuning issue, if you're running the stock computer with a blower you're going to run into problems.

Your engine is simply going "WTF" and most likely dumping in too much fuel.

Are you running an 03 Cobra fuel system setup? What injectors? You should 42lb injectors, a 90mm Lightning MAF, and the 03 Cobra dual pumps and the 03 Cobra baffled tank.

If you're running a stock tank, when you stand on it on lower rpms the weight transfer might be pulling fuel off the pump and sucking air.

You're going to go BOOM if you're not careful, get a custom chip burned and get on the dyno for some tuning, it's definitely a tuning issue.

Don't drive your car, get it tuned first or atleast get a base tune program, don't simply trust a "supposed" tune.

S

gsvt · Jul 13, 2004

ScottLuscombe said:
Well, it's pretty obvious it's a tuning issue, if you're running the stock computer with a blower you're going to run into problems.

Your engine is simply going "WTF" and most likely dumping in too much fuel.

Are you running an 03 Cobra fuel system setup? What injectors? You should 42lb injectors, a 90mm Lightning MAF, and the 03 Cobra dual pumps and the 03 Cobra baffled tank.

If you're running a stock tank, when you stand on it on lower rpms the weight transfer might be pulling fuel off the pump and sucking air.

You're going to go BOOM if you're not careful, get a custom chip burned and get on the dyno for some tuning, it's definitely a tuning issue.

Don't drive your car, get it tuned first or atleast get a base tune program, don't simply trust a "supposed" tune.

S

i have the fuel system out of an 01' cobra. I am using 30# injectors.. which came with the saleen kit. I have an 87mm maf. I'm just curious why I don't have this problem with i'm just standing still. only when i'm in gear. How much should it cost to get a chip and get it programmed? Should I buy the equipment or should I get it done? Which equipment should I buy? Thanks

Eric

gsvt · Jul 13, 2004

btw, my 87 pro-m is calibrated to 30# injectors. (Red)

gsvt · Jul 13, 2004

any idea?

gsvt · Jul 13, 2004

how about the Diablo Sport Predator Programmer ? I think the problem i'm having is because i have a smaller pulley on. The computer is programmed for a stock s281. I looked on the computer and it has it printed out by saleen.

GoBabyVroommm · Jul 13, 2004

Get a tune and you'll be fine. I have a 99 cobra motor in mine and its running lean all the time. It doesn't move off the red on the A/F gauge. Owell its all gettin fixed this winter. Good luck

gsvt · Jul 13, 2004

GoBabyVroommm said:
Get a tune and you'll be fine. I have a 99 cobra motor in mine and its running lean all the time. It doesn't move off the red on the A/F gauge. Owell its all gettin fixed this winter. Good luck

so i should get it tuned? or would the Diablo Sport Predator Programmer work?

8yourZ06 · Jul 13, 2004

gsvt said:
so i should get it tuned? or would the Diablo Sport Predator Programmer work?

You need to have a real tune. Sounds like you need to have your fuel map reprogrammed..

Green4.6GT · Jul 13, 2004

talk to cobra killer, T&J can definately help you out with a tune

Joel's98GT · Jul 13, 2004

8yourZ06 said:
You need to have a real tune. Sounds like you need to have your fuel map reprogrammed..

i agree, typical sign of maf/fuel mapping problem. you and unhook the maf from the intake pipe and ilde and rev all day but the second you apply load, it will die.

Kevin2811 · Jul 13, 2004

When you drive the car you also encounter load which is a hell of a lot different than just running it in neutral.

gsvt · Jul 14, 2004

Joel's98GT said:
i agree, typical sign of maf/fuel mapping problem. you and unhook the maf from the intake pipe and ilde and rev all day but the second you apply load, it will die.

what do you mean by a real tune? The Predator Programmer does fuel tables. i don't really know what that is. The reason I rather get that is becuase the only place I know around my house that will tune my car is Livernois Motorsports. But they are a rip off. They get their name in a mustang mag. a few times and they charged 900% what everyone else is charging. For example... 700 to do rear end gear on irs, 675 chip program, 600 shorty headers install, 700 for long install. Kinda steep if you ask me. I much rather just get the programmer myself and flash the computer if at all possible.

gsvt · Jul 14, 2004

what exactly is the fuel map? is that program part of the maf? or the ecm? the name cobra killer doesn't exist... and there is a t&jboy. Anyone know someone in the Detroit area that can help me out? Thanks...

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