N55 stutters on boost

[Sharas_v6]

Hi,

I have this issues where the engine struggles and stutters on boost at midrange, anywhere from 3500-4000rpm, mid to high throttle, running MHD and their OTS "Stage 2+" map and I am running out of ideas - maybe someone has some insights before i throw in the towel.
I have already replaced the ignition coils to new Delphi units, 2nd set of plugs - had NKG 97506, switched back to OE Bosch gapped down to ~.025, fuel pressures seem ok, no codes from the ecu.

The car: 2011 135 with DCT trans, stock pwg turbo, running on 91 octane
The mods:
Injen intake, intercooler with charge pipes, catless downpipe
GFB metal diverter valve (no 2ndary spring)
*catch* - i have done some light headwork, only blended in the valve seats and cleaned up the ports, nothing crazy.

Logs - 2 short pulls, one 2nd gear, one 2nd to 3rd, you can see how choppy the rpm curve is:

datazap.me | sharas_mr2 | Log 1602129544

datazap.me

datazap.me | sharas_mr2 | Log 1602129150

datazap.me

I am not a fan of all these OTS tunes, but want to make sure I am not missing something simple before i go spending money on a real tune.

 

[matt cangie]

Have you checked your plug gaps? In you logs, your TPS never hits WOT. Are you sure you're flooring it?

 

[machinehead]

can you do a log where you hold the pedal at wide open throttle?
The throttle might be closing to limit the boost.

 

[machinehead]

You are overboosting and the throttle is closing to control the boost, same problem on my car. I don't have a fix yet.

 

[Jobe0074]

Had similar issues with misfires at WOT -
Sure you have BUT, I’d triple check that the coil boots are totally engaged on the plugs
Check for any arcing etc
Potentially could also be a vacuum leak somewhere - maybe try a smoke test
Major PITA chasing these stutters / misfires etc
Wish you luck buddy