greys ecu running yellows, what would it run like?

[pl0x]

like title says what would a TT legacy with 4 plug ecu run like with yellows?

i dont know if anyone seen it on trademe but there was a 94 rs legacy for $1500 which "wasnt running write" said it idled crappy and felt like it had a massive boost leak and under powered.

Said he had just had a 96 tt engine with 80kms on it put in and it was running crap.

he didnt really give me alot of info when i asked question, so unsure whats in got lol

so im thinking it could have yellows and therefore running shit because its meant to be running greys

[dubbedup]

Run extremely rich, other than that pass.

[funkytown]

the 96 would suit a 3 lug loom wudnt it? not a 4 plug..? injectors are possible to..

does it have the 4plug still or a 3?

[pl0x]

id be stoked if it had the 3 plug, but im pretty sure it would still have the 94 ecu which is 4 plug,

but the newer 3 plug motor, which if the injectors were yellows could be causing the not running right.

really im trying to figure why it would not be running right

[BC5RA]

Without getting into the 4 plug 3 plug debate.

If running an ECU tuned for 380cc injectors and you physically run 440cc injectors, the ECU under closed loop (light throttle) will only just compensate for the difference in injector size, when it enters open loop (set parameters at full throttle) it will be doughy, low on power and eventually foul the Spark plugs.

[pl0x]

so, running on yellows wouldnt be causing the ruff idle?

[BC5RA]

If it has for sometime been running the 440's yes i would imagine so.

[Guest]

yep i am running yellows on stock 4 plug ecu and have been on a dyno and checked fuel/air mixture runs mint ;D cheers keith stewart dyno

[Guest boostin]

There's a good chance of it bore washing too.

[Guest]

would bore washing not show up running rich ect and surely have some detionation, i am getting good gas mileage and the wagon runs good, 500 odd ks a tank, also you would see this in your oil like it would smell more petroly and you would start making oil due to the unburnt fuel going down the cylinder and adding to the oil increasing to the oil level??? if that makes sense, i going to keep running them, i rebuild ma engine 17,000k ago and have ran yellows from start with no probs,

[ReubenH]

Mismatching injectors and ECU's just seems like a bad, if not stupid idea to me... And that's before the science.

It honestly is not hard to upgrade to a 3-plug ECU that will run yellows...