there really is no way to know where to shift unless u dyno ur car and once u see where the car hits its peak horsepower that would be the optimal shift point .. or before it starts to drastically go down in power.... the idea is that every one of us would dyno a different horsepower no matter if we all had the same mods therefore to know where to shift it would be different for every car...

LanceS13

That's why I asked for a torque curve in my original thread.  If I have torque for every 100rpm, I can give you the correct shift point to within 100rpm accuracy.  The optimal shift point isn't necessarily where peak hp is.  It's often different for every gear.  If you have a torque curve and gear ratios, I can give you the best shift points...it doesn't even have to be a 240.  That CarTest program does good too, but I don't see how it could be accurate down to 10rpm since it uses a generalized torque curve...but it seems pretty close.

drifterx

when i street race, on my 1990 240sx, the redline is 7000 RPM and the fuel cuts at 7200 RPM (dont ask me, hit it by accident while racing) i usually start to shift at like 6850 RPM, while flooring it, i sissor action the clutch and gas and shift.... usually it ends up shifting at around 6900-7000 RPM so it works out perfectly..

LanceS13

How is your redline at 7K.  Mine's at 6900 and fuel cut is at 7K.  And unless you're modified and have more top end than stock, it's pointless to shift much past 6700.

ca18guy

The best way would be goto a drag strip and mess around with different shift points and launch techniques. I went to a track alot with my old car and shaved .6 sec's off my 1/8 mile times by trying different things. First I find out what is the best launch technique then started working on when to shift. It's a good feeling to beat a faster car then yours cause you know how to drive your car.
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