Poll: Who has ever hit the rev limiter? - Page 16 - ZR-1 Net Registry Forums

Paul Workman · 11-22-2020

Well, in a stock motor, one starving for air, BTW, POWER does dip before the 7100 red line. In fact sources including "Mr. Jingles" (one of the (former?) test drivers for GM said he power shifts the ZR-1s @ 6200.

But, your right after the shift puts you right on top of the torque curve and behind the power peak as it is ramping up again.

Porting the LT5 - even (as I am) running stock cams, really turns the BEAST loose, and then the LT5 is just on the crest of the power curve (on a 5.7L motor). Add regrinding of the cams and some judicious phasing and you'll need to reset the cutoff to 7500 or 7600 or more to appreciate what the motor will deliver.

But, you don't have to take my word for it...ask Pete Polatsidis who ran his 5.7L LT5 to the low 11s on a regular basis before dropping in Kevin Costelos' 441 LT5 (that Pete also built).

Pictured are some more or less typical (inertia) dyno graphs showing the before (stock) and after (ported) results. Note the stock engine was cut off at ~ 6300 rpm, but the HP is just seen to be ebbing even then. And, the ported LT5 (before and after) shows the HP is at its crest at the 7000 rpm mark after porting; a significant improvement!

Subfixer · 10-05-2022

After my 415 build, I found the limiter pretty quickly. Mark did not change the upper limit.
This thing revs so fast, I wasn't ready.

Sent from my Pixel 4a (5G) using ZR-1 Net Registry mobile app

tiegsd · 10-10-2022

Can't say I ever have, try to shift before 6K or so when I'm trying to blow the carbon out. Near stock power is just fine for my driving profile & level of driving skill.

View Poll Results: Have you ever hit the rev limiter?
YES	147	67.12%
NO	72	32.88%
Voters: 219. You may not vote on this poll

10-05-2022	#152
Subfixer Join Date: Sep 2018 Location: Groton, CT Posts: 382	Re: Poll: Who has ever hit the rev limiter? After my 415 build, I found the limiter pretty quickly. Mark did not change the upper limit. This thing revs so fast, I wasn't ready. Sent from my Pixel 4a (5G) using ZR-1 Net Registry mobile app __________________ 1992 ZR1 #442, 2 tops, White, White, Haibeck 415, 3.90 gear, Coilovers 2018 Audi RS5, 2.9 V6 Twin Turbo, Auto, Black, Black 2021 Audi Q3, 2.0T, 8 spd Tiptronic, Navarro Blue metallic, Pearl Beige

10-10-2022	#153
tiegsd Join Date: Jul 2017 Location: West Chester, PA Posts: 378	Re: Poll: Who has ever hit the rev limiter? Can't say I ever have, try to shift before 6K or so when I'm trying to blow the carbon out. Near stock power is just fine for my driving profile & level of driving skill. __________________ 1990 Black/Black ZR-1 #1155 1993 White/Red coupe (Regrettably sold)