I recently went out to my first tack event at NJMP lightning and oh boy was it fun!

On the front straightaways into turn 1, I noticed I was over reving my car consistently just because it doesn’t make sense for me to up shift then downshift 2 gears before turning into turn 1.

I have a AP1 original engine, I’ve replaced my intake valve retainers and cotters. Should I replace my exhaust side as well? I’m curious of what you guys think I should do.

Thanks in advanced!

 

On the straights? You mean you're bouncing off of the fuel cutoff/rev limiter instead of upshifting? I don't think that counts as overrevving, as you're just bouncing off of 9k (personally I don't think that's still good practice, but I'll let other experts weigh in on that.

Overrevving in most cases is caused by missed downshifts, and forcing the motor jump to 10-12k RPM because you downshifted into the wrong gear.

Anyways, AP1 here, track a ton, only have AP2 retainers on the intake side because when I first got the car, I didn't know any better. If I open up the motor again, I'll ask the shop to do the exhaust side too next time. "Might as well" sort of mentality.

 

You do have a point, I guess I was just hitting the fuel cutoff on the straight. Thanks for the insight!

I still want to know if I should change out the AP1 retainers to Ap2 just as a peace of mind. But I keep seeing in the forums that it might end up bending a valve? And have valve float? If anyone have some insight on this it would be great!

 

Oh I'm sorry, I miss-read, so you still have AP1 keepers and retainers everywhere? Yes, get them done and onto AP2 for a peace of mine.

As mentioned, I have AP2 keepers/retainers on my AP1 original motor. I've had a mild money shift event out on the track once. I quickly caught that I was in the wrong gear and immediately clutched in, but telemetry data says I registered 10.0-10.5k RPM, no CEL. Then I did a full compression test and dyno'd the car. No loss of compression, no loss of power.

I'm probably on my 15-20th track day since then with the same motor, currently at 160k miles.

 

Bouncing off rev limiter wont crack them, but yes you should replace exhaust side as well. I postponed doing mine and they were definitely showing signs of cracking. Not all that hard to miss a shift on track, do it for peace of mind.