MeanStang08

Got a stupid question for all the brains on the board...

what would you set your rev limiter to ? i know/believe the stock limiter is set at 6000 RPM, and i currently have a bama-tune with it set to 6250 RPM

it flat-out kills me to be hammered into it.. look down just at the same time it hits the limiter.. it feels like i got another grande to go..

i've got stock internals, drive shaft, etc.. 08 GT the only thing driveline i've replaced would be the 4.10 rear end, then bolt on stuffs (C&L CAI, magnaflow 3" + offroad X pype)

would 6500 be asking too much ? any.. ANY... experience with raising that limiter will be helpful.. thanks guys!

ski

The stock rev limiter is set at 6250 rpm. Suggest setting yours up to at least at 6500 rpm if you want to shift at 6200, or up to 6800 rpm if you want to shift at 6500. The reason for this is because the ECM starts closing the throttle body at approx. 300 rpm below the rev limiter setting, which reduces the engine's hp output. Just make sure to keep an eye the tach if the rev limiter is set at 6800, since you don't want to go beyond 6500 on a steady basis.

Stkjock

i thought Bama set there limiter @ 6800

I have mine @ 6400 for the street and 6700 when I go to the track

AmericanSpeed

When I was N/A, I'd set mine to 6900 at the track and shift at 6700. What ski said is correct, the throttle body will start to close a couple hundred rpm before limitor so you want to leave yourself some room, just be mindful. STK has a pretty good method for a lower limiter for the street in case you get forget.

Mine sees a lot of track time, with zero engine problems....yet.

Cobrakev

On a basic stock motor, it stops producing HP around 5400 rpm. Torque drops off just after that. So why do you want to run the RPM's so high? With the 4:10's it should spin up pretty quick.

Simon1

You can get a fairly inexpensive shift light to remind you to shift.

On pump gas my rev limiter is at 6500 I think. 100 oct it's at 7000. It could rev a little higher but I have the light set to flash around 400 rpms prior to the limiter.

ski

The hp on a bone stock S197 GT engine reaches its peak at approx. 5500 rpm, but it continues producing hp at that same level until just a little under 6250 rpm(stock redline). Torque maxes out at 4000-4500 rpm, and quickly drops off after that.
The reason for shifting at higher rpm's with a tune is because the tune extends the engine's hp peak level past the stock 6250 rpm redline, and thus shifting beyond that rpm will take advantage of the lower gears' higher mechanical advantage for a longer period of time, which in turn increases the vehicle's acceleration rate. It also makes it easier staying near the engine's peak torque after shifting into the next gear, which also increases the acceleration rate.
Finally, for those who own an S197 GT with stock 17" tires and 3.55 gears, shifting it at 6500 rpm in 1st and 2nd gears enables the car to cross the 1/4 mile finish line at the top of 3rd. This eliminates the 3-4 shift, which allows the vehicle to maintain its 3rd gear momentum, and thus lowers the e.t.

AmericanSpeed

You hit that one right on the money

ski

Thanks for the kind words, AmericanSpeed.
I just noticed in your sig that you ran in the high 12's with only a CAI and a tune on stock tires. That's a heckuva great time. Did you have any other mods, like gears, UDP's, CMDP's, LT's, off-road pipes, etc.? What rpm did you launch at? What were the conditions for that run?

AmericanSpeed

No other mods, that run was just with the CAI + tune. I actually still have the stock exhaust and 3.55 gears. It was quite a while ago, I'm sure the conditions were favorable. I would launch at around 2400 rpm and slip the clutch for a good 20 feet or so. I'd lower the rear tire pressure to around 27 psi.