unas2k5

My Brenspeed tune will allow my engine to rev to 7300 RPMs. Is that safe?

Thanks

MRGTX

It depends on your definition of safe, I think. Yes, the engine will rev to 7300 RPM without exploding. I think that has been proven already. What is very hard to predict is what this will do to the longevity of the motor and wether or not the slight improvement in performance is worth it to you, knowing that the extra walloping that you're delivering to the bottom end of the motor will probably show up eventually.

For me, it is not worth it. I'm not a good enough driver where the extra 300 RPM would ever show up in a 1/4 mile time slip or on an autocross course.

FCMalie

Also unless you add on the Boss intake the stock one wont be making any extra power past 6,600 I believe. So there really is no point in revving it that high unless you've upgraded.

jsnyng

You don't do any sort of racing, do you?

cdynaco

As I understand it, the tuners raise the limit so you get full power all the way to redline. Because the ECU starts pulling timing as you near 7000, so you aren't getting full power all the way. (I'm guessing 6700 it starts reeling you in.)
So even though Brenspeed raised the limit to 7300, I would still stop at 7000 factory redline. But at least you'll run all the way there with a full charge.

jsnyng

Without the Boss intake, most of the 5.0's stop making additional power above 6850. The number one reason you'd want to rev out beyond that is to put you in the optimal position in the powerband AFTER you shift. If you're shifting where you stop making power, you're robbing yourself of power/speed/time in the next gear. I predominantly run autocross which is more or less 2nd gear most of the time. The shift isn't that important to me, but having the ability on a course that will allow for me to get to 7300 (which is rare) is that when I do have to get off the gas to go into a corner, my RPM is higher when I pick the throttle back up.

FCMalie

At the moment not really, I also haven't been in a car for almost 2 1/2 years. If I'm wrong oh well. But it makes since, at least to me, that once you start dropping power at higher rpms you are going to want to shift anyways.....

Like you pointed out though I don't have any personal racing experience.

jsnyng

I was just breaking your ***** a little. For a daily driver that is not seeing the race track, there really is no reason to be revving out to 7300. The ability to do so on the 1/4 mile is good for roughly .2-.3 of a second.

Anything that gives a competitive edge in an actual race is welcomed by me. I've won two autocross competitions this year by under .150 of a second on a 50+ second course. My ability to run it out to 7300, get off the gas and pick the throttle back up at 5700 instead of 5200 may have just been enough to give me those two .150 victories. One of the victories was by .021 (21 one thousandths) of a second. The difference was probably the very last corner and being in the right RPM range for the drag race to the finish line.

unas2k5

Doing a 1/4 mile run at what RPM should I shift? 7,000?

Thank everyone.