What is the max rpm that you guys are or have spun a stock itr valve train to? Just wondering! I have heard several different numbers, just wanted to see what you guys thought is a safe max while still being able to make power.

 

I've spun mine to 8500rpm no problems. But imo i'd say thats a safe spot to stop.

 

i take mine to 9k. redline is 9.5k but i'm scared to go that high. st00pid has pushed the stock itr valvetrain to 10k with no side effects, but at 10.5 he was snapping retainers. so i'd say 10 if you really really want to push it, and 9-9.5 if you want to be safe.

 

I thought the factory redline was 8900 rpm's.

If the factory dialed in a 8900 rpm rev limit, I'd say you could probably hit it regularly with no side effects whatsoever because that's what they engineered it for. The thing to remember is that even though rpm's increase linearly, risk to the motor increases exponentially due to the fact that the forces on the parts are increasing exponentially.

 

The factory rev limit is 8400, but the stock ITR tach is so inaccurate it usually reads about 8900 when the rev limiter kicks in.

The capability of the stock valvetrain depends heavily upon the cams being used. Smaller cams put less stress on the valvetrain and can spin to higher rpms safely, but they don't make power very high. Larger cams put more stress on the valvetrain thus lowering the safe redline, but they make more power up high.

With automatic B16 cams you could probably spin to 9500 all day with no problems, but it wouldn't matter as you'd stop making power at about 7000. Jun 3's could probably spin to about 8000 rpms without reliability problems but they make power much higher than that.

 

Wow. That low? That's only a couple hundred higher than a GSR...

Good point about cam profiles. I guess my stock ITR (96-97) cams are basically useless above 8500 rpm's anyway.