BrandonDrecksage

iTrader: (1)

I'm gonna start auto crossing my car once in a while and since i'll probably be in the stock rev limit a little bit, i was wondering if there would be any benefit to lower it. I know my car stops pulling as hard around 5500rpms. So if I lowered it to that and hit it more..would there be a negative effect..as opposed to hitting the 6250 stock limiter the same way?

I guess my actual beenfit should be..how much damage does hittting the stock limiter cause(I know you could bend a pushrod or have valve float)..would lowering it eliminate that?

67RSCamaroVette

iTrader: (63)

the rev limiter is there for a reason, no damage will result. Overrevving via mechanical or otherwise may damage your engine. why dont you get a shift light and program it?

BrandonDrecksage

iTrader: (1)

i have a shift light, but the courses are pretty much a 1st or 2nd gear thing. And sometimes it'll make more since to leave it in the gear then to have to upshift..jsut to down shift again. Plus..since the car doesn't really make anymore power..the higher rpms aren't benefical for the motor..I know that atleast...lol. I was just thinking because a guy locally has hp tuners and does small changes like delete o2 sensors..egr, rpm limit adjustment..everything but tuning the car for 60 bucks..and i need to get my rear o2s deleted, so i figured if it would help at all, might as well get it done.

Steel Chicken

iTrader: (3)

it wont help, and it wont hurt either.

to be honest, upgrade the driver. if you dont make power over 5500, then shift there. dont give yourself another crutch to depend on...

BrandonDrecksage

iTrader: (1)

its not a crutch...there is no point in shifting to 3rd gear ona tight autocross, cause your gonna spend more time upshifting then down shifting. You see people do it all the time at auto crosses. i jsut don't want to be laying into the stock rev limiter and expierence valve float. So i figured if I lower it, is there less chance for bad **** to happen.

I do shift there..at the drag strip...but auto crossing is different.

pianoprodigy

iTrader: (1)

um, obviously you're not going to hurt anything by lowering the rev limiter

Steel Chicken

iTrader: (3)

ummm ok, youre not gonna hurt anything by hitting the stock rev limiter once in a while.

instead off learning when to shift yourself depending on the situation, reprogram the PCM. whatever floats your boat. and it IS a crutch. if you can't learn to avoid the rev limiter through practice, then forcing the PCM to lower it for you so you dont have to worry about it IS a crutch.

But you seem to be taking this personally now, so do whatever. it wont hurt anything to lower it.

GuitsBoy

iTrader: (4)

Alternating pulling fuel and or spark from cylinders isnt going to be nice to your motor either. Im sure it adds some sort of bad harmonics and vibrations yoru bearings could live without. But you wont damage anything due to engine speed for sure.

Leave the limiter where it is. Its not the limiter thats causing valve float, its mechanically overrevving it thats causing it. Just dont stick it in the wrong gear.

ProdriveMS

There's no sense in lowering it. There will be times when you will need to shift into 3rd right before a corner. But shifting up to third, then having to get on the brakes right after is slower than if you had just kept it in 2nd and just revved it a little higher. The rally guys call it over rev. Rally cars peak at 4500, but redline at 9k. Those extra revs are called overrev and they are used only in the situation described above- approaching a corner with the engine past peak power. Real road race cars know the track ahead of time and select their ratios so that this situation never arises. Rally and auto-x don't have that luxury and so they benefit from a bit of overrev.

Al

GuitsBoy

iTrader: (4)

If youre that serious, why not put in a set of 918 springs and raise the limit to 6800 on the stock cam. You can still claim stock heads and cam, yet youll be able to up the limiter a bit. Heck, you could even replace with LS6 springs and raise the limit to 6600.