Rev Limiter

Mar 30th, 2003, 02:12 AM

I was just wondering about this, my friend with a 89 honda accord told me he took his car to 7K when it red lines at 6200 or something like that. When i tried to take my 99 sentra SE past the redline it wouldnt budge and got all jerky and stuff. I know this isn't goof for your engine i just wanted to see if it worked but why cant i do it and he can? ANd is a new ECU the only way to advance the rev limiter?

Thanks

Steve

P11GT · Mar 30th, 2003, 06:27 PM

The ECU can learn to raise its rev limiter, by *occasionally* bouncing it off the redline. But why? I find this dangerous.

Mar 30th, 2003, 07:01 PM

I know its not a good idea and i dont plan to try and take it past redline again i was just curious on why he could take his further and i couldn't. Thanks for the reply.

Steve

P11GT · Mar 30th, 2003, 07:22 PM

yeah, it just depends on how hard you drive. Youre friend might drive his car to the limit therefore raising the limiter, most japanese engines are good for high revs, but i wouldnt follow suit, maybe im just chicken!

toolapcfan · Mar 30th, 2003, 10:13 PM

He takes his to 7K? Who cares, your's goes to 7500!

His car might not have a rev limiter like your's does. So he's kind of a moron to push it even though the computer allows him to.

wickedsr20 · Mar 30th, 2003, 10:28 PM

Quote:

Originally posted by toolapcfan
He takes his to 7K? Who cares, your's goes to 7600! His car might not have a rev limiter like your's does. So he's kind of a moron to push it even though the computer allows him to.

Exactly. He is operating w/o a rev limit while you have one at 7100 rpms. Changing the ECU is the only way to raise the RPM limiter, but without the proper bolt-ons to take advantage of the extra RPMS, it's not worth doing at all. You'd be so far past the power peak that you'd be losing power and time playing around in that RPM range. And yes, your friend is asking for trouble (possible valve float) running his car that high and hard.

zeno · Mar 31st, 2003, 01:03 PM

Quote:

Exactly. He is operating w/o a rev limit while you have one at 7100 rpms. Changing the ECU is the only way to raise the RPM limiter, but without the proper bolt-ons to take advantage of the extra RPMS, it's not worth doing at all. You'd be so far past the power peak that you'd be losing power and time playing around in that RPM range. And yes, your friend is asking for trouble (possible valve float) running his car that high and hard.

^^^agreed^^^^

You can (relatively) safely bring the sr20de up to 7600 rpms. I know w/ 200SX/Sentras from '94-'97 you can swap in a G20 ECU and raise the redline to 7500rpm and get rid of the top speed cut off. I believe the wiring is different from 98'+ so I think the only way to change the redline is a JWT ECU (correct me if I'm wrong). There is a write up on how to jimmy-rig a G20 ECU to fit a 98 200SX but I don't know if it would work on your car.

toolapcfan · Mar 31st, 2003, 06:10 PM

B13 SR20DE's don't have a speed limiter. That 7500 RPM fuel cutoff and drag are the only things stopping you and a JWT ECU raises that cutoff up to like 7900 I think. B13 GA16DE's are however speed limited as well as have a fuel cutoff, not to mention the unescapeable (is that a word?) drag limit.

wickedsr20 · Mar 31st, 2003, 10:31 PM

But he has a 99 B14 with the 7100 RPM limit. B13's are so lucky.
And IIRC, someone on the SR20 forum swapped a G20 ecu into their 98 with no problems and no check engine light.

toolapcfan · Apr 1st, 2003, 02:50 PM

That's right, that sucks.

PrimeraP11 · Apr 1st, 2003, 07:15 PM

the sr20de before 98 can go up 7500 easy, after 98just 7000

bluebird94
primera98
both sr20de powered,the bluebird flys compared at primera, primera get up rev more easyly up 4000.

Johnny-wonk · Apr 2nd, 2003, 04:21 AM

Uh dont know about you guys but my rev limiter (fuel cut) kicks in at 7800. Yours should to if you have an NX2k or a 91-94 SE_R

toolapcfan · Apr 2nd, 2003, 10:38 AM

It's funny, we were having this argument in another thread.

B13 SE-R's have a rev limit set at 7500 RPM regardless what your tach reads, our tachs have been known to lie to us.

http://www.se-r.net/about/sentra_se-r/specs.html

Johnny-wonk · Apr 2nd, 2003, 07:45 PM

Ive used a Techtom and checked it. My car cut out at 7800. I always push my car to 7700 and then switch because I dont really have that much of a power loss up there. Its a wonderful thing!! I have the stock ECU also. Maybe every car is a bit different.

onyxeros · Apr 3rd, 2003, 02:31 PM

ummm you guys are half right about the '98-99 rev limiter. you CAN buy a g20 ecu and take it up to an indicated 7500rpm the ecu's are the same (obII) it will also get rid of the speed limiter but you will have a check engin light when you do it.

O