shift points and rev limits
Thread Starter
Instructor
Joined: Sep 2004
Posts: 210
Likes: 0
From: peoria il
shift points and rev limits
where are you guys shifting at. i have a 383 and the chip maker whats to know my WOT shift rpm : i said 5500
rev limiters : i said 6000
should i leave them there or are these good numbers
i have a 91 auto
rev limiters : i said 6000
should i leave them there or are these good numbers
i have a 91 auto
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
I believe a stock bottom end will take 6k easily.
Will your valve train handle the revs?
When I do heads & cam I plan on shifting at 6k. So maybe 6.5k would be a better limit.
Will your valve train handle the revs?
When I do heads & cam I plan on shifting at 6k. So maybe 6.5k would be a better limit.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
At what rpm does your engine make it's most power? Will it rev high enough past that point to make for an effective shift point? I shift my 160,000+ mile stock long blocked Crossfire at 6000 to 6200 rpm.
RACE ON!!!
RACE ON!!!
Safety Car
Joined: Dec 2004
Posts: 4,088
Likes: 0
From: Poop land
Originally Posted by CFI-EFI
At what rpm does your engine make it's most power? Will it rev high enough past that point to make for an effective shift point? I shift my 160,000+ mile stock long blocked Crossfire at 6000 to 6200 rpm.
RACE ON!!!
RACE ON!!!
If so, that's one of the BEST CFs ever made!!
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
My 383 super ram combo liked to shift at 5400. More rpm gave no improvement in 1/4 mile et or mph. Every combo is different. I would start at 4800 and move the shift light chip up 200 rpm at a time till you found the sweet spot. If seat of the pants is the goal, pick the one that feels best 
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by k0rv3tt389
That is quite a bit of revs for that CF motor, assuming you are 100% stock and never had the heads off.
If so, that's one of the BEST CFs ever made!!
If so, that's one of the BEST CFs ever made!!
RACE ON!!!
Racer
Joined: Feb 2004
Posts: 445
Likes: 1
From: Atlanta GA
I shift my '89 Auto at 5,500 - 5,600 since I installed the TPIS ported Big Mouth base, TPIS ported plenum and the SLP runners...the motor seems like it like to pull up there now. (As opposed to my stock TPI setup that seemed to die out around 4,700 RPM.
I imagine 5,500 would be a good shift point for your 383 and I would certainly think it could easily handle a 6,000 redline, perhaps a good bit more.
I imagine 5,500 would be a good shift point for your 383 and I would certainly think it could easily handle a 6,000 redline, perhaps a good bit more.
Safety Car
Joined: Dec 2004
Posts: 4,088
Likes: 0
From: Poop land
Originally Posted by CFI-EFI
The stock intake manifold has been ported and that has helped the breathing, but the long block is not only stock, it has never been disassembled for rebuilding or repairs. The head bolts have never been loosened. It IS a pretty good runner...for a Crossfire, even if it is worn out.
RACE ON!!!
RACE ON!!!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by CFI-EFI
At what rpm does your engine make it's most power? Will it rev high enough past that point to make for an effective shift point? I shift my 160,000+ mile stock long blocked Crossfire at 6000 to 6200 rpm.
RACE ON!!!
RACE ON!!!
I expect that to drop a bit when the stroker bottom end goes in but the torque gain should be killer. That must be one sweet manifold you've got there, my friend! 
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by k0rv3tt389
So approximately how many passes in the quarter have you made so far ever since ownership? What trans type do you have? Auto? Manual? What's your best ET and trap speed so far? I'm very impressed!
Originally Posted by Corvette Kid NC
That must be one sweet manifold you've got there, my friend!
RACE ON!!!
