2008 G6 GT Tune

[Russ K]

Just tuned my new G6 today. The stock trans shifts were super soft, now they are just firm enough at part throttle, and quite firm at WOT. I reduced the upshift torque reduction by 50%.

I disabled the AFR & Variable Cam spark tables, then remapped the main spark tables. Of course the knock sensors had to be desensitized even though the spark timing is conservative using 90 octane fuel.

The car is much more responsive now!

Russ Kemp

[Overclock This]

I assume this is with the 3.5L
I'd like to see what you'd do with a 3.6L Russ.

[z28mike]

yea, is this the 3.5L? I thought that wasn't supported yet? thanks

[Russ K]

Yes, it is the 3.5 engine.

Russ Kemp

[z28mike]

Yes, it is the 3.5 engine.

Russ Kemp

oh really? I thought the 3.5 wasn't supported in '08 yet?

[Russ K]

oh really? I thought the 3.5 wasn't supported in '08 yet?

The 2007+ 3.5 engines are supported. In 2006, only the 3.9 engines are supported.

Russ Kemp

[dlclarkiiRegal]

I tuned my G6 GTP with the 3.6VVT and holy cow! What a wake up. Solid 14s for sure My edited bin is in the repository.

[dlclarkiiRegal]

14.3s @ 97 mph for my G6, stock with an HP tune

[Bill@HPTuners]

14.3s @ 97 mph for my G6, stock with an HP tune

Very nice!

Did you get a stock tune baseline by any chance?

[dlclarkiiRegal]

Very nice!

Did you get a stock tune baseline by any chance?

No I didn't, stock is probably high 14s. I could have tried a stock tune at the track that night but it's such a PITA having to upload a 3.5MB file. Also this is a new car under warranty and I get real nervous flashing the ECM and TCM. These are the current 1/4 miles at G6performance for the 3.6VVT G6. The other members have an off the shelf tune with a CAI and catback. Again, I just have a personal tune with no other mods, so 4th place isn't bad.

1) 14.199 @ 97.42 - 3.6gtp
2) 14.209 @ 98.61 - steelgraygtp VMS ECM, CAI
3)14.250 @ 98.02 - steelgraygtp VMS ECM, CAI
4) 14.564 @ 94.95 - 3.6gtp
5) 14.569 @ 95.23 - Black Magik
6) 14.717 @ 82.48 - mi04se1
7) 14.787 @ 93.48 - steelgraygtp
8) 14.867 @ 93.22- Black Magik

[Bill@HPTuners]

Definitely can't complain with a solid 4th place with just a tune.

[dlclarkiiRegal]

It's mind boggling with the amount of data I have access to in the 3.5MB G6 compared to my 512Kb Regal bin. But the HP Tuners definetly help eliminate allot of the lag associated with the electronic throttle. Good job guys!

[Pwayne]

DLCLARK, can you post your factory untuned data as well? I have a CTS with 3.6 CVVT and I would like to compare your stock 3.6 to my stock 3.6, and then depending on how similiar they are use your tune as a possible starting point for my tune. Thanks.

[Ponti G6er]

Russ K,
I have a 2007 G6 GT with the 3.5 and i have the same tune you have in your 2008, is there anything else i can change on the tune or add anything if i have a cat-back exhaust?

[hutser15]

Any pointers for the 3.5l or any chance you may have that tune still?

[Nexus1155]

The last post in this was 8 years ago you big jerk! What is the 3.5L in maybe someone can help you with more information

[hutser15]

I'm sorry haha I have a 2008 pontiac g6 gt with a 3.5l lz4 motor and 4 speed trans

[Nickwfd92]

Russ. I have a question about my 08 cts 3.6

[FunkLife]

Just tuned my new G6 today. The stock trans shifts were super soft, now they are just firm enough at part throttle, and quite firm at WOT. I reduced the upshift torque reduction by 50%.

I disabled the AFR & Variable Cam spark tables, then remapped the main spark tables. Of course the knock sensors had to be desensitized even though the spark timing is conservative using 90 octane fuel.

The car is much more responsive now!

Russ Kemp

can i get the transmission tune or at least some explaination on what to do to tighten up my shifts especially at WOT? I have a 2006 GTP, 3.9L LZ9