Do mustangs have rev limiters?

Xcessiv said:

It really depends on the car. I own a '01 GT with basic mods:
- predator
- or h-pipe with catbacks
- cai
- 4.10s

My car WANTS to rev. It just keeps pulling until 5800-6000 RPM.
The area under the power curve is actually HIGHER if I shift at 6000 RPM with the predator.

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Help me out here. I'm looking at your graph and the red, blue and black lines for hp looks like they top at 4900 then go straight. The red line drips at 5700, the black at 5300 and the blue continues straight to the end of the graph. your tq peaks at ~4100.

Is the predator tune not shown in the graph? I don't see what you see.

SonicB said:

Help me out here. I'm looking at your graph and the red, blue and black lines for hp looks like they top at 4900 then go straight. The red line drips at 5700, the black at 5300 and the blue continues straight to the end of the graph. your tq peaks at ~4100.

Is the predator tune not shown in the graph? I don't see what you see.

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Sorry for the confusion.

The black line is the stock one.

The blue line is the original Predator performance tune.

The red line is an optimised version of the Predator performance tune (better A/F ratio). The guy most probably let off the throttle at 5700 RPM because such a drop would be illogical.

you limiter should be a 6050rpms. IF it is not there it has been romoved via chip or flash.

If you can't figure out how to shift before 7k I would put it back in because you are not making any power up there and it is not good for the motor.

sometimes I wish the limiter was a tad higher like 6250 or 6500(not 7k though). only because if you lose traction in first it his the limiter pretty easy. you shold be shifting before 6050 though in reality. I only hit mine if my traction goes away I will bump it sometimes.

I have ran mine to 6300-6400 and it feels like a DOG up there, really past 6K it just fall of like a rock. Pulls to 5800 strong, stock it would smash its face into the ground at 5500. Oh and I ran up to 5300+ because I TOLD the programmers to leave the rev limiter and stock it would hit it at around 6050 (supposed to be 6250) according to my tach. So since the chip I had gone to just past 6K a few times and it never hit the limiter, so I tried one day to make sure and went to between 6.3-6.4 K and NO LIMIT.Got scared and shifted to 3rd, im guessing its set at 6500. BTW that guy I raced said he was doing a burnout and reved it over to 7100RPMs by accident. But its funny, with my car its own lack of power past 6K acts as a limiter because when I light the tires from a rolling in 1st it goes over to 6100 then stays there for a second and then starts hooking back up.Oh and that deal with it cutting fuel doesnt seem to blower friendly. Maybe its good my limiter is set at 6500 (?).

Mirrahasmycar said:

the best place to shift is around 5000-5200 depending on mods, 5500 is actually makes you slower, if your motor is set to rev higher and can handle it then go higher, you want to hit the max hp on shifts, not max rpms

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wrong
Consider the next seconds after you shift at peak power. Your engine speed after your shift drops to a point on the curve where you are making a much lower amount of power than if you shifted at an engine speed after peak. Let's say your peak power is 245 and you shift right then so your engine speed drops to where you are making 170 hp. You could say that that's not bad, or you could stay in gear past your 245 hp mark until your power output drops to 200 hp and once you complete your shift your engine drops to a speed where it is making 200 hp.

rule of thumb: you shift when: hp @rpm-before shift = hp @rpm-after shift

to do this you must take into account your transmission ratios. Somebody post up a dyno chart of their stock stang and we can pick out the optimal shift points together