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Discussion Starter #1
hey guys, on a z51 6 speed what rpm do you find for the smoothest shifting? how fast releasing clutch? and when you are releasing clutch inbetween shifts do you use a little bit of throttle?
 

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6500 rpms!
 

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This is paraphrased from someone more knowledgeable than I am but here is a little information about Z51 gearing.....

The base C6 has the same transmission close gear ratios as the Z06. The Z51 transmission has a wider ratio gearbox....the difference isn't huge but the Z51 is setup more for the parking lot gymkhana enthusiast.

Z51 tranny has a 5.32:1 spread from low to high (2.97:1 from low to 4th). Z06 and base has a 5.21:1 spread from low to high (2.66:1 from low to 4th). The race ready car has a closer gearbox, and so does the base, compared to the wider ratio Z51, particularly in the 1st to 4th range which is what matters in almost all racing. Closer ratios mean the engine can be kept closer to the power peak in all out racing. Wide ratio boxes are typically found in trucks, where the granny low lets them more easily start off a heavy load.

Again, the overall difference between the two transmissions isn't huge.

Shift points are relative depending upon road conditions and how you're driving the car at the time (such as when you're driving aggressively). When down-shifting, you might find it advantageous to rev-match or even double-clutch. Unless you're on a drag strip there would likely be no need to power-shift.
 

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Discussion Starter #5
yea, but the z51 has better quarter mile stats. isnt the z51 suppose to be quicker than the base vette?
 

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WAAAAAAAAAAAAAAAAy faster almost .002 in the sitting mile :thumbsup:
 

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This is paraphrased from someone more knowledgeable than I am but here is a little information about Z51 gearing.....

The base C6 has the same transmission close gear ratios as the Z06. The Z51 transmission has a wider ratio gearbox....the difference isn't huge but the Z51 is setup more for the parking lot gymkhana enthusiast.

Z51 tranny has a 5.32:1 spread from low to high (2.97:1 from low to 4th). Z06 and base has a 5.21:1 spread from low to high (2.66:1 from low to 4th). The race ready car has a closer gearbox, and so does the base, compared to the wider ratio Z51, particularly in the 1st to 4th range which is what matters in almost all racing. Closer ratios mean the engine can be kept closer to the power peak in all out racing. Wide ratio boxes are typically found in trucks, where the granny low lets them more easily start off a heavy load.

Again, the overall difference between the two transmissions isn't huge.

Shift points are relative depending upon road conditions and how you're driving the car at the time (such as when you're driving aggressively). When down-shifting, you might find it advantageous to rev-match or even double-clutch. Unless you're on a drag strip there would likely be no need to power-shift.
:agree:
On a road course shift points are determined by the course. My shift light is set at 6200 and my g-tech shows shifts near 6700 in first and scond and 6500 third to fourth. But on track my shifts are determined by the course. I often hold third when I could upshift if I would have to immediately down shift for a corner.

I often short shift on road courses to manage Oil Temps.

Most C6 drivers do not power shift.

:cheers:
 

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Discussion Starter #8
i heared for the most hp, and fastest time are to shift at 6,000 anything after or before you lose hp,and not as quick in 1/4 mile.
 

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:rolleyes: waste of time

Every freekin time someone answers your questions you

ask it in a different way Edited :WTF
 

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i heard for the most hp, and fastest time are to shift at 6,000 anything after or before you lose hp,and not as quick in 1/4 mile.
My Engine redline is 7000. I have my rev limiter set at 6800. For a stock motor that is close.

Here are my staock and 403 dynos


:cheers:
 

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Nice Numbers !! :partyon:
 

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Nice Numbers !! :partyon:
Thanks. But the point wasn't the numbers it was the horsepower & torque curves. The "sweet spot" to shift should put you in the power curve of the next gear. If you are road racing your torque peak is key. For me with my Kooks headers I like to stay in the higher RPM range of my curve, someone with LGs would shift earlier and their "sweet spot" would be different from mine.

:cheers:
 
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