Help with Shift Points
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,380
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Help with Shift Points
Hey guys - using my most recent dyno graph (the RED lines,) at what RPM should I be shifting?
I currently shift just before the limiter (6100-ish - yes, I tap it every now and then :bb) and it's netted me a best of 12.5@115 with crappy - but consistent - 2.0 60' times. I know my 60' needs work, but was wondering if changing the shift points will yield any benefits. ;)
JC
I currently shift just before the limiter (6100-ish - yes, I tap it every now and then :bb) and it's netted me a best of 12.5@115 with crappy - but consistent - 2.0 60' times. I know my 60' needs work, but was wondering if changing the shift points will yield any benefits. ;)
JC
Team Owner
Joined: Nov 1999
Posts: 32,782
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: Help with Shift Points (The One)
Your an A4????????????
And what rear do you have?????????????
And what rear do you have?????????????
Team Owner
Joined: Nov 1999
Posts: 32,782
Likes: 11
From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: Help with Shift Points (The One)
The shift points should be fine, but that 60' needs to come way down.
Melting Slicks
Joined: Oct 2000
Posts: 2,524
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From: Stamford CT.
Re: Help with Shift Points (The One)
The only real way to know what is going to work best for you is to try differant shift points. Trying lower shift point can some times pay you a divedend in MPH with no loss in et, and some times a better et. Some times hiting the limiter in bracket raceing is not a good plan, depending on the competion an terrable plan. Ric
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,380
Likes: 0
Re: Help with Shift Points (Power Shifter)
The only real way to know what is going to work best for you is to try differant shift points. Trying lower shift point can some times pay you a divedend in MPH with no loss in et, and some times a better et. Some times hiting the limiter in bracket raceing is not a good plan, depending on the competion an terrable plan. Ric
JC
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Melting Slicks
Joined: Oct 2000
Posts: 2,524
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From: Stamford CT.
Re: Help with Shift Points (The One)
JC, Dyno's are only good for tuneing the motor. I recomend trying differant points on all the shifts but one at a time on each run, compare the differance in times 60-330, 330-660, 660-1000 ect. It will tack you time but will likely reward you for the effort. Geting into high gear sooner if the car has the TQ is a rule of thumb, but trying it is the ONLY real way to know what rpm on each shift. Ric
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,380
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Re: Help with Shift Points (Power Shifter)
Thanks again, Ric. I have seen numerous references to power and torque curves on this forum regarding shifting to keep the car in the sweet spot, hence this post. I do value and appreciate your advice, though. Looks like there are a few experimentation runs awaiting me. :D Thanks! :cheers:
JC
JC
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Joined: Dec 1999
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From: Littleton, CO USA
Re: Help with Shift Points (The One)
Hi all,
I'd like to recommend the book AUTO MATH Handbook by John Lawlor. in the opening paragraph of the chapter named Shift Points he states "To get the best acceleration out of a high-performance vehicle during shifts, hot rodders say you should stay 'on the cam.' What they mean is that you should keep the engine within an rpm range where the transmission is delivering optimum torque before and after each shift."
He provides formulas to determine optimum shift points.
Good luck!
I'd like to recommend the book AUTO MATH Handbook by John Lawlor. in the opening paragraph of the chapter named Shift Points he states "To get the best acceleration out of a high-performance vehicle during shifts, hot rodders say you should stay 'on the cam.' What they mean is that you should keep the engine within an rpm range where the transmission is delivering optimum torque before and after each shift."
He provides formulas to determine optimum shift points.
Good luck!
