Z35 motor theory

b15 · 10-08-2014, 08:59 AM

Quote:

Originally Posted by mishuko

bimmer's are tuned that way... i know the 335 peaks around 3k rpm with majority coming in between 2-2.5 range. the car idled in low 1k range. In all honesty I did not notice any 'lag' in the get-go but if shifting around 3k rpm it would feel like a long shift/power response compared to shifting at say 3.5 or 4k...

I think most Factory FI cars are tuned that way, especially the more 'civilian' ones. My good friend has a 2010 GTI 6MT and his peak torque comes in at 1700rpm and is pretty flat through 5000 or so. It does fall flat up top so winding it all the way to red line doesn't do that much. Once he added intake and APR stage 1 tune, it really woke up.

Chuck33079 · 10-08-2014, 09:09 AM

Quote:

Originally Posted by b15

I think most Factory FI cars are tuned that way, especially the more 'civilian' ones. My good friend has a 2010 GTI 6MT and his peak torque comes in at 1700rpm and is pretty flat through 5000 or so. It does fall flat up top so winding it all the way to red line doesn't do that much. Once he added intake and APR stage 1 tune, it really woke up.

Yeah, that's the problem. Manufacturers don't think customers want to deal with a low boost threshold, so they use undersized turbos. They feel peppy down low and die up top. You can run more boost out of them, but they end up just blowing hot air once you run them out of their efficiency range. I'd be happy if they put in a factory turbo motor with the headroom to swap out the turbo without building a motor. Some lag is unavoidable, since there is many feet of pipe and an intercooler that must be pressurized before the motor sees positive pressure.

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