i have a 2006 with the factory jcw pkg installed. it pulls like a champ right up to 6800 rpm. then just hits a wall. i'd like to get another 1k out of it. is it possible, and is it safe. i know it has 6 gears, but i love the revs.
rbrauser

 

Isnt that where the Rev limiter kicks in ... probably in the ECU? Not sure. Read around the performance threads. Some ppl have higher ... but got to remove the limiter. Maybe MTH does that. GO much higher and I think ppl talk about valve float, needing head work, etc.

Lots of ppl here should give you the right scoop But I do know that if the power comes on at 6K, whats the point of going higher since your on the downslope of the curve?

 

MTH will bump you up to ~7200 I think. I know that there's software that will bump you up higher but you start getting into dangerous territory at ~8000 according to FTR.

 

I run 8125 [or so] rpm, myself. Safe and loud as a banshee! If anyone lives around me, they should come for a ride and judge for themselves .

 

going to 7200 is pointless without changing where the engine makes its power ... maybe a different CAM. In stock form you would be slowing down.

Your right about 8K. Besides valve float you probably need forged pistons ... I think they talk about that.

 

i have GIAC which has the 7200 redline, however as Chow says due to the supercharger and the flat torque curve that peaks in the middle of the rev range, the car would be accelarating slower than if you shifted to the next gear. the only perk is if you are on a race track and am about to hit the next turn but need to shift. instead of shifting you can ring it out a bit longer in the gear.

 

I can say that this is false, from personal expeience. These cars accelerate FASTER because when you shift from 1st to second at 8k, you're turning more revs into second. The change is dramatic.

 

At least from MY experience, with the mods in MY car, that the car accelarates faster if i shift below redline. At least with me, just because the car is turning more revs doesnt mean that i am moving faster than if i was to shift to the next gear and get back into the strongest part of my rev range.
I remember you saying that you had gotten some dynos done of your car, i would be very interested to see how different your torque graph looks with your mods in comparison to ones withs similar mods to my Eaton style torque band.

 

Before dynos are done and the rev limiter extended to 8k+, but the AF tune was not completed by the vendor. School started way too quickly, and that much is sadly still on hold. I'm not gonna post or invest until the tune is done. I can tell you without a doubt, though, that power did not fall from from 7-8k. It's sweet .

If you'd like, I'll find some place to host a video of some rev unlimited magic . Lemme know.

 

All you need is an accellerometer. It can show you your accelleration and you can plot versus RPM. Do for each gear. Then you can know exactly what RPMs offer you the best accelleration. Graph them over the top of eachother, and then you can see where to shift for each gear for optimum accelleration.

 

I find that hard to believe since you only accelerate on the torque curve.

"... a car will accelerate hardest at its torque peak in any given gear, and will not accelerate as hard below that peak, or above it. Torque is the only thing that a driver feels, and horsepower is just sort of an esoteric measurement in that context."

http://vettenet.org/torquehp.html

If you have made modification to change the stock torque curve then yes, Otherwise, I dont see it?

 

I have made a change to the power curve with my Schrick cam. But, I think you're missing something here...

When you upshift, from 1st to 2nd, for instance, you end up in a gear which is tougher to turn [slower to accelerate in]. [You also lose acceleration rate by having to shift. ] The engine may be putting out the same or even more torque, BUT more torque is needed to accelerate in that higher gear, and so less forward acceleration is found. Fact: no matter where your peak is, peak acceleration in 1st gear will be less than in 2nd at that peak [which is less than 3rd, etc.].

Case in point: With a normal redline [6800], in my car, I can go just shy of 49 mph in 1st. I then would normally go to 2nd at about 4.9k and accelerate from there. By 5.6k or so, I'd be at 56 mph. If, instead, I continue accelerating until my new redline [8.1k], I can [and do] reach 56 IN FIRST. I did not have to lose time in shifting, and I did not have to graduate to a higher gear to get there. Though the torque may drop a little [dyno is still to show], acceleration from 6.8k to 8.1k, I'm driving in a much easier gear, and so I will be able to accelerate between the old and new redline speeds at a higher rate. I am able to accelerate at a higher rate, clear as day.

I will try to replace the fuse in my g tech and video record some 0-xx runs in g force mode, for posting. [I'm hoping that the fuse is what is broken, because it spontaneously crapped out a month ago, and I've been uniterested so far in figuring it out...lol!]

Hope this is clearer. Faster acceleration is a reality, in this case, I do assure... I will do everything in my power to show this rationally, because I do wholly understand how this can be confusing from anyone's but the driver's seat.... You don't happen to live in Florida, do you?

 

OK, then you moved the power curve to the right and hence shifting past 6800 makes more sense because your still accelating on the torque curve.

Yes, shifting slows you down, agreed

I guess I understand that third part, THANKS!

FL, I WISH!!! When I retire !!!

 

there have been plenty of dyno graphs of mini-power but I've never seen one graped past 7500 or so. Interesting to see how the engine performs above 8k