how high do you guys rev your engs and how do you remove the rev rimiter my does not rev over 7.5 rpms

 

Why?

That "limiter" is fuel cut.

 

Well, since your sig would indicate having an 88, that would have a fuel cut somewhere around 8k RPM. Given how bad the stock tach is, accuracy-wise, 7.5k indicated could very well be at that cutoff.

Does it just sit there, or does it bounce off the rev limiter "Honda-at-a-stoplight" style?

Finally, there is ZERO reason to rev the engine beyond that point. With stock intake/exhaust/ports, you're not making significant power up there anyway, and if you are at the point that you have a peripheral ported race motor, you already should know how to rev higher.

For reference, the S4 ECU is not capable of reliably firing the spark timing-wise above 7400 RPM or so, based on an analysis of parts in it.

-=Russ=-

 

Why would you rev your engine that High unless its a solidly ported engine that might be efficient to those kinds of RPMs??

fuel cut is supposed to be a safety. remember that once your ECU say it isn't safe, listen to him

otherwise you're probably gonna start another thread asking : '' rebuild a rotary... is it simple??? "

c'mon, dont beat your 7....

 

I know somebody who autocrosses an 88 2nd gen and he revs to 10k. He said it would be easy. Would it? Thanks, because I want to autocross my car.

 

just need to stay in 2nd gear longer . when i shift to 3rd its to low of and rpm

 

10k on a built engine I'm sure. If you need to stay in a gear longer, get different gears (3.90).

 

thanks

 

And how much money does he have in it?

The stock flywheel & clutch are rated to 8500 RPM. Beyond that, you run a significantly increased risk of them exploding. This requires a clutch scatter shield, and a higher RPM rated flywheel/clutch.

You also, at 10k RPM, stand a very high risk of rotor/iron contact from eccentric shaft flex. You need the rotors race clearanced to be able to stand this without contacting the irons and destroying themselves by welding the corner seals in (things stop sealing so well at that point, and you've just destroyed the rotors and probably the irons).

And, ignoring those, the engine will probably spin to 10k RPM stock, but you'll need an aftermarket ECU to fire the spark at that RPM with *any* semblence of sanity, and the stock ports will be next to useless for making any power.

Oh, the water pump will be well into the cavitation RPM range(starts happening around 6k or 7k with the stock pulleys) that it won't be pumping a damn thing, and will be rapidly chewing up the impeller. You'll need aftermarket underdrive pulleys to make this work.

Do you get the picture? 10k RPM on a stock engine either isn't going to happen, or won't happen for long.

-=Russ=-

 

Bullshit.


-Ted

 

im with him........

BULLSHIT

 

i could have sworn it says the good ol disclaimer on the products at speedmachine...let me qutoe it....


"
WARNING: None of the Flywheel or Clutch components shown in this catalog should ever be allowed to exceed 10,500 RPM under any condition. This same RPM limit applies to stock components. You must use an engine RPM-limiter to prevent excessive RPM. If your engine is capable of exceeding 8,500 RPM you must install a transmission scatter shield, or ballistic blanket. Failure to implement the above may result in serious injury or even death. "

"
If your engine is capable of exceeding 8,500 RPM you must install a transmission scatter shield, or ballistic blanket. Failure to implement the above may result in serious injury or even death."


i like the part about serious injury or even DEATH....does ur buddy have a fully built race ready car for AUTO-X and why would he be reving that high at auto x???? those courses are usually really tight and short and keep you from opening up all that way...in a car like taht it would run crappy IMO because his power band should be wayyyy up there and he wouldnt be pulling outta corners or anything for that matter in a tight short course like that...but hey what do i know...OH i know this...
"
If your engine is capable of exceeding 8,500 RPM you must install a transmission scatter shield, or ballistic blanket. Failure to implement the above may result in serious injury or even death."


LOL

 

10K huh? I would have to agree that thats bullshit, in a stock enviroment there's no need for that kind of rev. staying in powerband provides enough power to launch the rx.

what does a scatter shield do?

 

Prevents the grenaded parts of the flywheel from flying through your legs when the flywheel lets go at too high of an RPM.

Most flywheel start breaking up above 8500 RPM, but I have seen some jeep/chrysler ones fail at as low as 5500--- not pretty... chunks of metal flying through the floor boards

 

I've seen pictures of cars after a flywheel exploded. It packs somewhere close to the power of a hand grenade, right around your feet. It's not something to mess around with.

-=Russ=-

 

I dunno, hand grenades in the foot well of a car is a lot of fun. This guy should listen hard to everyone, I really don't want to hear him whinning on the forum when he has no feet.