Graph inside, when should i be shifting?
Launching!
Joined: Aug 2006
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From: Richardson, TX
Based on that graph I was say as late as possible your making power until they stopped the pull. Are you using a rev limiter of 6800? If so you may try bumping it up to 7k and shifting around 6800.
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Launching!
Joined: Aug 2005
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I had the rev limiter set to that, but i recently had them bump it up to 7200 so that i can rev it out to 7000 rpm. My window switch for my nitrous (when i finally spray) is set to 6700 but I think im going to set it to 6900.
I know that someone mentioned shifting about 500 rpm after peak power to keep you in the right part of your power band. So i am working on that.
I know that someone mentioned shifting about 500 rpm after peak power to keep you in the right part of your power band. So i am working on that.
11 Second Club
Joined: May 2004
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From: Troy,MI.
I would shift at 7000 Rpm if not higher. You will be droping down to 4900 Rpm after you shift. From your graph you are only making 370/380 HP at this RPM. this is a lot less power than you are making at 6800 RPM, so why shift?
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Launching!
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11 Second Club
Joined: May 2004
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From: Troy,MI.
I don't think so.The RPM drop is determined by the spread in the gear ratios.The less the spread the less the RPM drop. Why do you think racers all want close ratio gear boxes. The Z06 box has a spread of about .7. That means the RPM will drop about 70% on the shift.A auto is different because of the TC.
TECH Apprentice
Joined: Dec 2003
Posts: 319
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From: Tennessee
For the fastest times at the drag strip you should shift as late as possible. 7k is better than 6800, etc. It really depends on how high the motor can safely spin. The reason why is :
1) It puts you higher in the RPM band after the shift
2) It keeps you in the lower gear longer, where the effective torque is much higher. IE. first gear puts down more torque than second gear, etc.
The only reason I can think of to short shift is if the tries are spinning. In that case traction is better. Same goes for powershifting, if the tries can hold do it.
1) It puts you higher in the RPM band after the shift
2) It keeps you in the lower gear longer, where the effective torque is much higher. IE. first gear puts down more torque than second gear, etc.
The only reason I can think of to short shift is if the tries are spinning. In that case traction is better. Same goes for powershifting, if the tries can hold do it.
If you let the car get below 5000 perhaps after the shift when the car goes into the next gear you will start losing et.
There is no point in shifting after peak power has been reached. Shifting after peak power is only putting more undue strain on the valve trains components( mainly the valve springs ).
Keith
Keith
i agree! :
: 
Shifting @ 7K in 1st, 2nd and 3rd gear will leave you between 4800 and 4900 rpm on each shift. Pretty much the sweet spot for torque with ls6 motors anyway.
Just curious but what are cam specs? It really looks like it is carrying good power
Just curious but what are cam specs? It really looks like it is carrying good power
TECH Apprentice
Joined: Dec 2003
Posts: 319
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From: Tennessee
This is my car with 463rwhp and 409rwtq, very similar to DAVE's setup/numbers/ and dyno curve. Granted, I have alot of seat time but you get the point.
View My Video
My limiter is set to 7000 in this video and I was nicking it on the shifts. The only thing that hurt my time was the slight nick of the limiter on every shift which cost me about .1.