FastBird91
Registered User
Assuming my automatic 91' SC modified does 145 mph top end with the rear ratio at 3.27, what do you guys think ill be at with a 3.73 rear ratio top end? I want faster 1/4 miles but i definately dont want to lose top end.
FastBird91 said:Assuming my automatic 91' SC modified does 145 mph top end with the rear ratio at 3.27, what do you guys think ill be at with a 3.73 rear ratio top end? I want faster 1/4 miles but i definately dont want to lose top end.
PS: Anthony doesn't need the gearing with the 2.3 whipple, he needs more RPMs in 3rd.
And not to question you Dave, but in 4th gear with the lose of 500rpm's wouldn't that potentially mean that he is going to lose TMPH? I've always contended that if he redline's 500rpm sooner than usual, those rpm's would pretty valuable in OD.
SilverCasket said:With those calculations, it IS safe to say that he will lose MPH in the upper RPM's. Unless he is chipless and limited.
And weird as it is, when I am at 80 I am just over the 3000 line. That's when I'm in the gas to maintain it. But when I let off of the throttle (still at 80) the RPM's drop about 500 rpm's. Perhaps it's the non-locking. I don't know. .. But either way to maintain 80 I'm just over 3000 with the 3.73's.
Not many people rev out to 6200. Unless their crazy! Especially with a stock bottom end
Anthony
6200 isn't that high. I try to shift between 6000 & 6200 at the track and usually hit the 6500 rev limiter just doing a burnout and sometimes on the 1-2 shift. I had to raise the rev limiter to 6800 on the nitrous program to avoid hitting it on the 1-2 shift and getting a nitrous backfire.
David Neibert said:Anthony,
You must have a non locking converter if your reving that high. My converter stalls at about 2700 rpm and at 75 mph on level ground I'm showing 2700-2900 on the tach. The warmer the trans fluid the higher it revs. Going up a slight to moderate grade requires 2800-3000 to maintain the same speed. So it sounds like yours is pretty close to mine or may even have a higher stall setting.
Do you have a trans temp gauge ? How big is the cooler ?
6200 isn't that high. I try to shift between 6000 & 6200 at the track and usually hit the 6500 rev limiter just doing a burnout and sometimes on the 1-2 shift. I had to raise the rev limiter to 6800 on the nitrous program to avoid hitting it on the 1-2 shift and getting a nitrous backfire.
David