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Old 16-09-2019, 18:28   #16
plip1953
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Originally Posted by Canadian_CD9A View Post
It's limited below 5000 RPM, torque usually drops off after that and boost can be cranked up. Smaller turbos are notorious for torque spikes around 4000 RPM and larger turbos can make a lot between 4000 and 5000, which can exceed the transmission's capability.
What you say is fair enough - up to a point. For a car to make ,say, 500bhp (flywheel)at 7000rpm, torque must be 500/7000 x 5252 = 375ft/lbs. I guess these days (with modern ecus etc) it would be possible to ensure that torque was never higher than 375ft/lbs at any point in the rev range, but not the normal kind of thing to do. Or are you suggesting exactly that is quite normal in Nth America?
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Old 17-09-2019, 19:25   #17
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Originally Posted by plip1953 View Post
I guess these days (with modern ecus etc) it would be possible to ensure that torque was never higher than 375ft/lbs at any point in the rev range, but not the normal kind of thing to do. Or are you suggesting exactly that is quite normal in Nth America?
If you have good closed loop boost control it's fairly straightforward to do.

It's commonly done in situations where there is a well known limitation - such as the rods in later Evo's, or limited traction in 2wd cars.
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