5* of KR and a bit of mis at WOT

**guimond47** · 09-19-2011

hey guys finally got all the parts installed on the car :
- Aero force scan gauge
- boost gauge ( getting 8psi on 3.4 Pulley)
- headers. 3 inch down
- thermstate 180
- AL 104's gapped at 52.
- overkill tune pcm
- 3.4 pulley
- cat back exhaust
- open cone K&N kilter 4 inch inlet.
- NGK wires.
- running on ultra 94 octane that i found in my city and rarly on 91 oct.
OKAY! now to start im getting rough 4-5*KR at WOT which isent too good. the power is there tho. and im also getting hesetation like a misfire only at WOT. what could this be wire new plugs new and all gapped corrrectly.
why am i having soo much KR? after putting on all the mods? an soo low of boost like 8 psi on 3.4 pulley isent right..

**2007gpgt** · 09-19-2011

Did it begin happening after the new plugs and wires were installed? 8 psi on 3.4 seems ok to me, headers and exhaust will decrease boost due to less restriction..

**guimond47** · 09-19-2011

no kr was always there. i would hate to upsize my pulley again because i love the power...

**01gpgt01** · 09-19-2011

Need a better tune. If upping to a 3.6 kills the KR then your probobly making more or the same power

**Explicit_Spade** · 09-19-2011

What mods is the tune for?

**guimond47** · 09-20-2011

Its the over kill pcm 4.2 i think

**blueguy** · 09-20-2011

Huh...

http://www.grandprixforums.net/chipp...mon-51934.html

http://www.grandprixforums.net/al-10...res-52049.html

http://www.grandprixforums.net/97-gt...wer-48080.html

Anywho...

8psi is fine. The problem is it is elsewhere. Are your mounts bad? Is your front sway bar flipped upside down to avoid the downpipe hitting it?

Check those.

Also...AL104's gapped anywhere from .050"-.055" would be fine.

**BillBoost37** · 09-20-2011

Which cylinder are the misfires on? I'd think that's where you'd concentrate your efforts.

**SlowNA06** · 09-20-2011

The gtp's Overkill tune was rather too rich. Probably ~10.5afr wot. Saw plenty of KR (4-7*) at the top. Might be worthwhile to look into that.

**guimond47** · 09-24-2011

downpipe dosent hit the sway bar at all. i heard some people had that issue. but i never had issues with that. illl change that coil pack and go from there...

**guimond47** · 09-24-2011

i went to toronto yesturday to try and find will (overkill motorsports) shop and there was no luck. its like its unlocatable

**Overkill** · 09-24-2011

I had sent you an email regarding that. Its a mailing only address, all you'd find is a UPS Store.

I'm certainly available for in-car tuning if you'd like me to have a closer look at the vehicle, we just need to make an appointment. I'm booking just over a week in advance at the moment (track season, busy).

**matt5112** · 09-24-2011

8 psi at 4000 rpm or 5700 in second gear?

Thread: 5* of KR and a bit of mis at WOT

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