KC21386

I am interested in getting a dyno tune for my dad's 09' G8 GT. Particularly hoping to improve the intelligence of the transmission on downshifts. It really struggles to choose which gear it wants to grab, I assume due to the six speed automatic. I have seen graphs showing 20 hp/tq gains on a stock G8 GT as well.

I am curious what results others have seen in regards to hp/tq, shifting intelligence, fuel mileage, and lastly effect on warranty if brought to GM for service.

Thanks!

Slowhawk

iTrader: (12)

G8's have the worst tunes I've ever seen from GM.

2QUIK4U

iTrader: (7)

There is alot of power and drivability to be gained from tuning the G8. The trans tune makes a huge difference. Many companies offer stealth tunes that are supposed to be undetectable by the stealership. After getting my G8 tuned I cant imagine driving one without a tune. I recomend headers and an intake as well. With those mods his G8 should be around 350rwhp and way more fun to drive.

Devilish34

iTrader: (2)

You'll notice the biggest difference in the trans. Seems like most ppl see 20/20+ gain w/a tune and CAI

TNTramair

iTrader: (15)

my ****'s a slug....its needs a tune and ****** TM backed down.

G8GT721

it will feel like a new animal after a tune!

cdubbzz

iTrader: (11)

If he doesn't plan on any major mods then buy a Superchips Cortex tuner. It provides multiple types of tunes depending on mods (stock vs cold air), octane (87/91/93) and enables you to fully reprogram the trans (shift firmness for upshifts/downshifts and shift points). You can also raise the rev limiter and top speed limiter.

The best part is you can flash back to stock prior to a dealer visit. I have one with a Vararam cold air and power is up ~40rwhp. At WOT my car chirps 1-2nd & 2nd-3rd

edmanet

^^ +1 ^^

I'll 2nd that also......And as far as the warranty is concerned if its something minor the dealer usually doesn't say anything but if its a major repair they will more than likely deny your claim if you installed a tune......My car won't even idle on a stock tune...LOL


You need to put some DRs on that car !!!!

Frans96SS

iTrader: (15)

We tuned one today with an air intake, Pulley, No cats and a catback and picked it up 40rwhp.