I just completed my swap over to my current project and I seem to have a stutter from 2,200 - 3,000 only. The car has 30lb injectors + Pro-M calibrated MAF which the previous owner added to the donor car. Stock a9L ECU, EGR system (all emissions) eliminated, and 100% OEM fuel system beyond the injectors.
The car runs fine in any condition from idle - 2,200 rpm and then 3,000 - 5,200rpm. It just has a small window of issue. It will fight through it, but you just can't pass quickly. It's only when it's warm (in closed loop mode) and runs through the gears in warm-up condidtion (before the car gets up to temp).
My thoughts are currently:
- injectors + MAF are too big and car struggles with too much fuel when going from a steady cruise to sudden acceleration
- someone suggested a poor ground for the distributor, and I'm lost where I could add a ground. The harness has been modified, and all grounds are better than OEM condition.
Anyone have thoughts?
I haven't checked codes on the car, so I may try that soon. It's not just a plug in and watch the lights as my set-up barely resembles OEM condition.
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