Quote:
Originally Posted by Fastend
Well, how much torque will stock rods hold?
In Poland turbo gt86 which I have seen have got 300hp with 310nm torque or less
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It depends on where the torque is applied. At low rpms, there is less tolerance for torque because the piston speed is slower. There is a greater chance of knock/preignition/detonation too because there is less flow of clean air circulating in and exhaust gases circulating out. Oil pressures are also lower, so there is a greater risk of bearing contact.
As the piston speed increases, not only is it harder to make more torque because the flame front is chasing the piston, but the torque is applied when there is less inertia to overcome.
With that said, as it was suggested, a supercharger will build torque with RPMs, so there is less risk to the rods. Essentially, the turbo will make more torque down low, so if the peak tolerance is 250wtq down low, but the turbo stays flat, then the supercharger could hit 250wtq low and grow to 300wtq up high. Of course, a boost controller and tuner could be used to do progressive boosting. In short, the limit depends on the rpms, but in general, it is probably around 250-300wtq.