Low rev/high load stuble

[UnatralyAspiratd]

I have been fighting this issue since I got the MPI on the road. I drive the car everyday but this issue is quite annoying. It appears when you start from a stop... its idling at 1000 and you release the clutch and the revs fall to say 800. As you add throttle (or dont) it stubles and chuggs. I can feel it when i blip the throttle in neutral. it stumbles for a second before it revs clean. It idles all day long and starts well. Runs just fine down the road, as low as i can run the revs and the issue is not present. Its only when i start from a stop. I can avoid it if i add some revs (basically keep it 1000+) before the clutch starts to grab. Tried adding some fuel to the affected zone and it is better but still does it. Havent messed with the timing yet, its at 10 or 12 in that region, maybe I'll add a few clicks.

 

any suggestions?

 

Heres the deal:

Magna Intake

Performance Electronics ECU

-8 braided stainless fuel line

Aeromotive BCFPR (~45psi @ 0psi, +1/+1)

Walbro 255 lph pump

2.5" Intercooler plumbing

70mm Aus. TB

550cc Injectors

Accel coils (wasted spark, no dist.)

Stock turbo

 

Thanks,

Chris

[button]

i would assume an ignition timing mis-calculation... try adjusting the lower ign values.