Any ideas what's causing my car to over fuel so bad?

[lee2cossies]

Here's what a plug looks like after running for 5 mins.

It's running l8 ecu with 83lbs Siemens, has a new set pressure Bosch regulator, new coolant temp and air charge, set tps, tried a few map sensors same issue! I'm thinking its got to be the chip or possibly the co adjuster on ecu? Any ideas?

[twin turbo]

have you adjusted the co on ecu? it need to be setup correct,

[lee2cossies]

Havnt touched it but it was fine on a previous car with very similar spec to mine. I know it will need setting up but I'm only trying to get the car to run decent so I can run it in until it gets mapped.

[mark shead]

What's the diff in spec.

Mark

[twin turbo]

"very similar" and identical, is a big diffrence...

[lee2cossies]

The only difference in spec is headwork and turbo. Sx200 has replaced a gt30. Didn't think it would cause it to over fuel this bad? Il end up having to get it set up to run it in.

[twin turbo]

offcourse a headjob and turbo Will make diffrence, if not it would be no point doing it..

[lee2cossies]

I know it will make a difference but cause it to over fuel this bad just on idle after running with new plugs fitted for at the most 5 minutes? Iv never had any problems before with changing spec turbos etc when the car is just idling?

[James @ Auto Dynamix]

headwork causes a big change in manifold depression, it will read higher in the map closer to atmosphere and there is far more fuel up there.

[twin turbo]

a head job(porting++) is to make the head flow more air, so Will need more fuel on same pressure(mapsensor) since much more air Will go into cylinders on all rpm. so if then you put on a Stock head you Will get allot less air into the cylinders att the same pressure in innlet, but still feed just as much fuel in, causing it to overfuel.

same With turbo but not so much effect if "similar" turbo, but Will make some diffrence since resistance and air flow..

very basic told, but you get the point?

[lee2cossies]

Get the point but the only difference in head work I meant was one head was a ported head by nms and the new head is touring car spec by nick waples so imagine their going to be different but not as much a difference as standard to say 500hp spec. It's best for me to get a temporary chip then to my exact spec is best?

[James @ Auto Dynamix]

so many things can make differences though, cam timing being one,
if it was me, id want to do the job in 2 parts at that spec, get the car in and check diagnostics and set up, then map it a base to allow you to run in on, then bring it back once done for some boost.

what inlet manifold is it on?

[twin turbo]

two diffrent portjobs Will not flow the same.

and running in is BS, in my opinion... the engine should be runn in like it is supose to be used, if not, how Will it be ready for it? you dont sit on in a Chair looking at tv and eating chips if you are in "training" to run a maraton?

[lee2cossies]

so many things can make differences though, cam timing being one,
if it was me, id want to do the job in 2 parts at that spec, get the car in and check diagnostics and set up, then map it a base to allow you to run in on, then bring it back once done for some boost.

what inlet manifold is it on?

That sounds a plan james, only problem is it's 200 miles away to where I'm taking it to be mapped! Could msd do a chip for me just to run in with my spec?

[James @ Auto Dynamix]

not at your spec really, its a live mapper