ukrbmw

I know our engines are pretty well setup anyways, but has anybody done this? Seems to be about a $1,000 from several of the vendors on this board. Any real power gains?

ltcjmramos

I have the FVD-Brombacher ECU flash. Dyno went from 323 to 340 rwhp. Forget the tq gain.

LVDell

do you feel that your car is slow?

ukrbmw

Is that why people modify their cars Dell?

I always thought it was more of a journey, not a quest

LVDell

Who me? I'd never mod my cars. Stock all the way baby!

In all seriousness though, I never once considered tuning the DME. These cars are pretty max'd out. Suspension and driver are the weak spots on these cars.

ukrbmw

That's pretty much my thought as well. But, it was late at night and I had a question....

Mr Michael B

I can speak fluently on this topic, as I have installed hundreds of ECU tunes. As of recently I flashed my GT3 ECU as well.

From the moment I installed this I felt that the seat of the pants feel it is basically unperceivable, and at that point I assumed that track performance would be similar. But in my case I was way off. My car responded extremely well to the upgrade when flogged. Gains were apparent throughout the rev range. Back in mid-2000's I assisted in the dyno session that brought this tune to the table. The dyno (Mustang four wheel dyno) only produced a hand full of peak power gains but there was/is a more aggressive gain within the rev range reached before peak power. And it really shows itself on track. Impressively. With that said though an exhaust upgrade is specified to get the additional gains hoped for.

Oh, and a caveat: Part throttle street driving is somewhat different as the timing of the Vairo-cam / Vario-ram is not as pedestrian as the factory tune. This is felt by the immediate reaction of those GIAC tuned components compared to the softened reaction programmed via the factory. It is somewhat dramatic at part throttle - as it removes a considerable amount of the smoothness.

Would I do it again?

Yes, as long as track driving was in the cards.

LVDell

....and a few adult beverages

ltcjmramos

I did it to improve low-end street driving since the car no longer sees the track. I spoke with them about my goals, and feel the tune made the car less twitchy for the street.

spare tire

I looked into getting the Revo tune but they would never post the dyno plots on their website. They talked of additional horspower but would not print where in the rpm band. Getting more air to flow through our engine and then squirting in more fuel and burning it = more horsepower. That's why a new exhaust is necessary, either bigger diameter pipes, or less bends. A new higher flow intake also will allow more air in. Back to back laps on a given track with the tune and without are the best way to evaluate if there are gains or is it "just feels faster."

911SLOW

A DME tune is not necessary in a stock car but won't hurt either. It can alter the throttle response or increase the rev limiter for example.
On the other hand if you decide to address the exhaust system, which is by far the weakest link in a 6GT3, then a new mapping is essential to ensure that the new setup will work with optimum parameters and to avoid potential check engine lights especially if you decide to run 100 cell cats.
In any case the maximum HP gain from the DME alone is in the region of 10HP, if it's done by a reputable tuner.
Companies that claim +30 HP from a new DME map are simply selling snake oil.

ukrbmw

Dude - are you spying on me?!?!

Thanks John - I'm only running muffler bypass, so not really a full exhaust. Victor ran 200 CEL cats and had some issues, so now I'm hesitant to really mess with the exhaust.

Car does sound good!

PS - Mr Gordon put the thought in my mind of getting the 997 GT3 throttle body (especially when it's $300) and getting it tuned, plus my bypass, who knows, 30 hp for $1500? Although I don't know of any tuners in our area....

va122

The CG cats were 100 CEL and yes I had issues.

himself

What dyno was this? And are these corrected or uncorrected numbers?

-td

ltcjmramos

Dyno Dynamics, SAE corrected. Tq went from 230 to 245.

BTW, original dyno was done in early 2006. The flash and that run were done in early 2009, 10K miles apart.