Hey everyone, i just received my PCM from Overkill Will. looked over everything that i ordered and all is good except for one thing. i have an 04 gtp. the PCM i received is for an 04 comp g. will this make a difference? will i need to ship this thing back? any suggestions?

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Yea that will be a problem. The gear ratio will be wrong. The shifts will be at the wrong rpm and the DIC mpg's will be off. I would return and get the right one. Do you have a tuner or know someone close that does? You could change the final drive ratio and everything should re-calc from there.

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06 GT, K&N CAI, AFC-2.0, ZZP MPS-3.5, HPtuner, PLX Wideband, Ceramic coated PLOG/Crossover/PEM/3" DP Hi-Flow Cat, Corsa Catback, GMPP STB's/w Don's Brackets, GMPP SwayBar, GMPP TArms, 180Stat, AL104

I knew something would be messed up. i had nothing but problems gettin this PCM. Ill try emailing Will and see how he is going to correct this. i do not know anyone with a tuner that can change the settings, kinda wish i bought one now. it probably would be easier for Will just to tell me what to change. Oh well i guess it will be another 4 weeks till i get a replacement. this PCM better be worth the hassle!!! thanks for the input.

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Will locks his PCM's so you couldnt even get the bin to change the ratio....that sucks!! Trust me i tried ! I have heard from lots of people the overkill pcm is by far the best off the shelf pcm for our cars. Unless you got a tuner.

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Dave's Hocus Pocus Tuning of South Dakota

Ken I received the Overkill PCM you sent me today and I'm going to install it tonite. I'll let you know how it works after a thorough test drive.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

Man they werent joking when they said you would get it tomorrow. BTW. how do you do the security relearn. i read the write up, but i dont understand it that well. do you start the engine and let it run for the fifteen minutes, or just turn it to on for fifteen minutes? do you hold the key to the start position til a security notice appears on the DIC? im probably not reading it clearly, so any info is cool

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I know that was FAST! I didn't expect to get it until next week. I forgot about having to do that stupid security relearn, I had trouble with it when I installed the DHP.

You try to start the car, then let the key spring back to the on position for 15 minutes, then turn the key off for 10 seconds. Try to start the car again and repeat the above precedure 2 more times. On the 4th try cross your fingers and HOPE it starts, and if it doesn't say a bunch of cuss words and try it again from the beginning.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

Ok I got the PCM installed and let's hope the Security Relearn works the first time!

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

nice, well i hope it works.

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I let it sit for 20 minutes after a no start and a security enabled message, turned the key off for 20 seconds and it started on the 2nd try. When I took it for a drive, I instantly noticed the car is more responsive and pulls a lot harder now. It shifts so much smoother at light throttle, yet nice and firm at WOT. The Tapshift works a lot better too, and it doesn't slam into 1st anymore when I come to a stop. The trans temp never got above 190 and I was driving it hard for about a half an hour. I'm really happy with the Overkill PCM, it's so much better than the DHP. Will definitely did a great job with the programming!

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

overkill ftw

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Custom Tails to come eventually, possibly, hopefully!

i will soon too be switching to overkill, im gonna email will this week....

i do have dhp now but im not very happy with it anymore, plus i wanna see what everyone is raving about with the overkill one!

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Im waiting on mine..

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Never argue with an idiot, he will drag you down to his level and beat you with experience.

on my 06 the security relearn was like 5 seconds lol u put the key in, turn into inginition, leave it 5 seconds take it out, open the door to shut everythin off, and the security relearn is done

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

mine too!

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Custom Tails to come eventually, possibly, hopefully!

Are you guys running the 2005 PCM?

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

mine is

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Custom Tails to come eventually, possibly, hopefully!

I love mine and mine started the very first time i tried

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1.9 rr's,90lb springs,3.2zzp,180*,Overkill,Wizaird,MSD,L32 swap,AL 104's,ZZP Shift kit,SD headers, 8K HID LED tails,STB's, Don Romes Brackets Was a Base Model, 0KR

yeah I am, and its not FUN!! lotsa codes come out, cant use my tire pressure system, gauges go funny sometimes, but it handles my smaller pulley

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

As long as it goes fast the other things don't matter!

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

Very true^^^^^

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1.9 rr's,90lb springs,3.2zzp,180*,Overkill,Wizaird,MSD,L32 swap,AL 104's,ZZP Shift kit,SD headers, 8K HID LED tails,STB's, Don Romes Brackets Was a Base Model, 0KR

^^^^ VER VERY TRUE, thats y i still got t

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

the TPM doesnt work? maybe that explains why it hasnt said anything, my tires are at 25psi, I have to bump them to 30

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Custom Tails to come eventually, possibly, hopefully!

my tire is flat and it doesnt complain at all!

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

LMAO!!!!!

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website