[NickyRacerBoy]

Originally Posted by Nicul15

Cool build, glad to see you’re doing it yourself too. Did you go aftermarket cam?

Yes I did. I worked with Lonnie @ Texas Speed to come up with a "torquer cam"

Originally Posted by SSDan

I think everyone is beating you up on this like you were purposely over reving the engine. As I watched the video It appeared to me your over revs were from engaging the clutch too soon for a 4th to 3rd downshift while scrubbing off a lot of speed to make that low speed turn at the end of the straight away.
If you could discipline yourself to not engage the clutch when going into 3rd until you were below 100 mph you would avoid the mechanical over rev.
Easy for me to say when I'm not in the seat facing down that turn and doing all the things needed - braking, downshifting, hitting the apex - etc.
Its just a timing thing on the clutch release. I'm sure you will get it down with the new motor once you are back out there. Good luck with the build.

THANKS!
Yeah I kinda felt like a punching bag a little..LOL..

Yes I stretched 4th gear out.. cause going into 5th, I thought, would be a waste. I betcha RPM transmission make a 5 and 6 gear set that is not over drive. I know for a fact that they do for old T56. I think its called M12....

Originally Posted by baron95

Believe it or not it is all connected.

You are starting the downshift at the end of the straight already above redline. (I understand why you did it - I have other posts saying that it seams the shift from 4th to the very long 5th is death for the Camaro SS in acceleration).

If you were in 5th gear, you'd be below 5,000 RPM, and would either do 5-4-3 or 5-3 (which is a slower move than 4-3). People tend to develop these timing cues on track. You can't really watch the speedo on your downshift. It is moving too fast under heavy brake. Most people do it based on timing. Some (very few) use reference markers to clutch out.

You get used to the time it takes to do 5-4-3 or slow 5-3 at the end of a typical track straight ~140-145MPH. Now all of a sudden you start stretching 4th, perform the fastest downshift 4->3 and clutch out with the same timing. Now you are still too fast for 3rd.

It feels good. You are less busy at the end of straight. Instead of 4-5-4-3, you now only need to do 4-3. You can devote more brain cells to watch the markers. You start braking later, downshifting faster.

The little over revving becomes a larger overrevving. 7200 on a 6,600 redline is a serious ˜10% over rev.

Boom.

I probably have corrected over a dozen students who were over revving on downshift. Most let the clutch out very slowly, so there is little to no shock to the engine - but I still remind them that they were starting clutch out at too high a speed.

This scenario, that contributed to your engine failure, is much more common than you think. Every time you stretch 4th you need to be very, very vigilant.

Don't beat yourself up. It happens to the best drivers. I too raised the redline of my Coyote Mustang GT to 7,350 (˜5%) RPM with a tune that made it develop meaningful power to deal with the very short Mustang gears. Luckily I never blew my engine, but I did have an early clutch failure - possibly the slight over-revving contributed to it.

Helpful and useful posts like the above is why I hang here! Thanks. I usually hang with the guys at Phoenix Racing, Joe Aquilante.
That old man rolls!

Originally Posted by TrackClub

Words of wisdom. I would add: Fine to run it out in 4th but no reason go push to redline. Watch the revs and hold at 6000. Then downshift as late as possible before turn in. Rev match makes it easy and safe. No reason to downshift early. Ciao!