3 replies to this topic

[dieter1310]

Hello,

Quick question to the people with a standard SPI engine/gearbox.

How many rpm does your engine run at which speed?

I fitted an other gearbox (probably with 3.44 diff) and I run 3000 rpm at 80 km/h (50 mph)
And when I asked a friend with an SPI, he does the same rpm for the same speed, but I always thought the SPI had an 3.1 final drive, so normally his rpm should be lower...
Anyone to compare with.

Thanks,
Dieter

[SimonWicklow]

at 70mph mine sits just above 4000 ive got a stage one fitted.

[xrocketengineer]

Check out Guessworks ratio calculator. It might help you out:

http://www.guess-wor.../Tech/ratio.htm

[dieter1310]

thanks
Will take a look at this site.