ben_vtec

is hitting the rev limiter bad when you have a turbo'd honda. i heard it was bad to hit it when using nitrous. and know that some turbo cars i have driven cut out for a second or so (escort rs turbo) where others have a conventonal rev limiter (pulsar gtir). does it cut out for a reason or is it just a different type of limiter.

i dont plan on bouncing my car off the limiter every time i pull out of a junction......i just want to know if i should be extra careful to avoid doing it.

can i rev it as high anyway with a turbo (b16a2)

cheers

Mista Bone

Factory limiter (fuel cut) is the worst thing you can do on a boosted or juiced motor. The best idea is to get ECU rechipped and use a MSD 6AL to cut spark before the fuel cut kicks in. A fuel cut is the worst form of lean out possible!

FYI I have a D16Z6 on juice. I'm using a Locash ECU with a 8500 fuel cut. My MSD 6 AL is set at 7600 or 7800 rpm.

meanteg

Yes, it can damage your engine if you hit it too often.

btw, Can someone confirm me that on a 94-01 Teg GSR the cutoff is an ignition cut ?

immortal

all stock cuts are fuel cuts

RGAZ

I am with bone. NEVER hit a stock rev limit (fuel cut) while boosting. It is the worst form of lean-out possible and will make very high cylinder temps. Get a MSD 6AL soft-touch and you can hit it all day.

Randy

civicgsr

I'll agree with everyone on the rev limiter issue. Another form of protection, is setup a shift light and have it flash before you get to redline. Maybe 500-700 rpms early. Hondata's is setup to flash at 7800 with an 8500 redline.

The best form of protection is an aftermarket ignition with rev control. It even feels better than the fuel shutoff.

-Alex

bruthaboost

This may be a stupid q, but how can one go lean with a fuel cut. If the fuel is cut, isn't there nothing to ignite-isn't just hot (compressed) air? So doesn't the engine essentially just pump air for the brief moments (while the tranny/internal resistance is slowing it down) it's above the limiter.

civicgsr

I'm going to venture to say that there will always be a little unburnt fuel in the cylinder but it is possible that there would so little fuel that if it did detonate, it wouldn't be significant enough to cause a problem.

My thought, so if it's totally off base, I apologize.

-Alex

RGAZ

There is always a little fuel being sucked into the engine because not all is burnt every cycle and the cylinder isn't totally cleared every cycle. So what that means is you get a very hot burn for a cycle or two which heat-soak the valves and can damage them faster than they can disipate the heat. This is especially bad at high rpms when the firing cylces are very close together and the car is under a heavy load. The key to the whole idea is that the temperature of the combustion is too high for the chamber to properly dissipate the heat and things start to melt. Its just plain bad.

Randy

TypeC

I know this is true for Nitrous, but I never heard of it about boost. I've bounced off the rev limiter at 16psi in my WRX plenty of times (not intentionally, but in a drift) and nothing happens. I haven't watched my EGT's at the time, but no one's said anything about it being a concern (of course you can't be a dumbass).

ben_vtec

what type of rev limiters does a hondata use?

civicgsr

It's a fuel cut rev limit. They are using the stock method of rev limit. I think it would be far more difficult to reprogram the ECU to incorporate ignition cut.

Or, may monkies fly out of my ***....

ben_vtec

so what about the full throttle shifting which hondata say doubles as anti-lag on a turbo'd car.......and the rev limiter for keeping you at constant revs for your launch

SIK IN DA HED

your car doesnt count... it already came turbo'd. hehe im sure the engineers prepped the ecu to avoid problems like that. if not... then oh well!

SIK IN DA HED

i wonder if it hurts your engine if you misshift and tach it over redline by accident.