[Z06] shift points
Thread Starter
Le Mans Master
Joined: Jun 2003
Posts: 9,251
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From: 2007 Nat'l Corvette Challenge 11.50 index Champ. New Jersey
shift points
Anybody know what RPM is the best to bang shifts in a race w/ my 03 ZO6? I'd keep my right foot on the floor of course,but not sure where the best shift points are for 1-2,2-3,3-4. Thanks!! :auto:
Team Owner
Joined: Mar 2001
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From: Virginia Beach
CI 3-5-6-7-8 Veteran
Re: shift points (Dr.Ron)
These ls6s pull like trains all the way untill 6500, so shift at 6300ish and you'll be banging out shifts at redline! I personally wouldn't powershift my ride (speedshift as fast as I can) due to the extra strain on the drivetrain, but it's your car and that is the fastest way from point A to B. :cheers:
Le Mans Master
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From: Poway CA
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Re: shift points (Dr.Ron)
Someone posted a detailed analysis of this problem in C5 tech a few weeks ago. Basically, you want to keep the engine as close as possible to it's peak torque RPM at all times.
This means running up PAST the peak torque RPM by an amount that is exactly as high above the peak torque number as the "new" (after shift) RPM is below it.
The guy also concluded that shifting at redline was usually the right answer!
Perhaps someone has already done the math for the stock Z06 dyno numbers and transmissions ratios?
This means running up PAST the peak torque RPM by an amount that is exactly as high above the peak torque number as the "new" (after shift) RPM is below it.
The guy also concluded that shifting at redline was usually the right answer!
Perhaps someone has already done the math for the stock Z06 dyno numbers and transmissions ratios?
Drifting
Joined: Mar 2002
Posts: 1,687
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From: Kemah Tx
Re: shift points (SDVette)
Someone posted a detailed analysis of this problem in C5 tech a few weeks ago. Basically, you want to keep the engine as close as possible to it's peak torque RPM at all times.
This means running up PAST the peak torque RPM by an amount that is exactly as high above the peak torque number as the "new" (after shift) RPM is below it.
The guy also concluded that shifting at redline was usually the right answer!
Perhaps someone has already done the math for the stock Z06 dyno numbers and transmissions ratios?
This means running up PAST the peak torque RPM by an amount that is exactly as high above the peak torque number as the "new" (after shift) RPM is below it.
The guy also concluded that shifting at redline was usually the right answer!
Perhaps someone has already done the math for the stock Z06 dyno numbers and transmissions ratios?
Le Mans Master
Joined: Jan 2000
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From: Poway CA
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Re: shift points (FLYNLO)
The ZO6 dyno climbs all the way to redline......so you want to shift as close to redline as possible.
Here is one from on 03 Z06: http://forums.corvetteforum.com/zerothread?id=593547
Drifting
Joined: Mar 2002
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From: Kemah Tx
Re: shift points (SDVette)
The ZO6 dyno climbs all the way to redline......so you want to shift as close to redline as possible.
Actually, in the couple dynos I have looked at, the torque peeks at around 5K RPM, while the HP peaks at redline.
Here is one from on 03 Z06: http://forums.corvetteforum.com/zerothread?id=593547
Actually, in the couple dynos I have looked at, the torque peeks at around 5K RPM, while the HP peaks at redline.
Here is one from on 03 Z06: http://forums.corvetteforum.com/zerothread?id=593547
Le Mans Master
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From: Poway CA
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Re: shift points (FLYNLO)
No, not 5K.. But maybe something less that 6500????
I wish I could find the link, but I cannot locate it now.
I think it all comes down to how many RPM you "loose" on the shift. Your MN12 has closer ratios than my MN6, so you will "loose" less RPMs on a shift.
Maybe there is an optimum shift point a little below the red line on the Z06???
Who's got the ratios and done the math?
I wish I could find the link, but I cannot locate it now.
I think it all comes down to how many RPM you "loose" on the shift. Your MN12 has closer ratios than my MN6, so you will "loose" less RPMs on a shift.
Maybe there is an optimum shift point a little below the red line on the Z06???
Who's got the ratios and done the math?
Thread Starter
Le Mans Master
Joined: Jun 2003
Posts: 9,251
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From: 2007 Nat'l Corvette Challenge 11.50 index Champ. New Jersey
Re: shift points (Dr.Ron)
I would think red line shifts (especially a power shift) would bounce me off the rev limiter,no??? As you know, during power shifting, your right foot stays planted on the floor. As you bang the shift and hit the clutch the engine lurches ahead in RPM's. I used to power shift my Mustang @ 5500 RPMs @ Englishtown. Seemed to work. ;)
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Le Mans Master
Joined: Dec 1999
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From: Greenville SC
Re: shift points (Dr.Ron)
I used to power shift my Mustang @ 5500 RPMs @ Englishtown. Seemed to work. ;)
That gave plenty of room for power shifting. If you are shifting a Z06 at 6,500 rpms, it seems to me that if you leave the car WOT, you will bounce of the limiter... Maybe that won't matter, because as soon as you engage the next gear it should be fine, but I'd rather speedshift the car and not risk hitting the next gear with the rev limiter engaged.
I'd be willing to try powershifting if it works though.
Melting Slicks
Joined: Oct 2000
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From: Stamford CT.
Re: shift points (Tom Steele)
The theory is you look at the efective drive shaft torque at your shift point, and then also look at the drive shaft torque after your shift to try to maximize acceleration. This is how you get the numbers: drive shaft torque=flywheel torque X transmision ratio.: You can figuer rpm after your shift by divideing the ratio of the gear your shifting into by the ratio of the gear your shifting from X rpm before you shift. You will find that the person-s that say there shifting at red line either have raised there limiter, don't look at there tach and are actualy guessing at the shift point or there not power shifting. If your power shifting, 6300 is the rpm I useualy shift. But there are many variables and what most starting out don't fully understand, is when you change one variable it has an efect on all the other variables, changeing them also. The corect answer to best shift point is also a variable for that reason. Get out to the track and have fun finding the best shift points for your driveing style. Ric
