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5

I believe you are confusing torque (TQ) and horsepower (HP) terms here. HP is a mathematical computation based on TQ. You can derive a HP number by increasing the rotational speed up/down depending on what you want to achieve. Weight of a vehicle will have no affect on either. As mentioned in the comments, TQ output (at the wheels) is greatly affected by ...


3

The general "rule of thumb" for horsepower ratings between crank HP (CHP) and rear-wheel HP (RWHP) is ~18-20%. An automatic transmission will be closer to 20%, while a manual transmission around 18%. As you stated, and for the same reasons, these are just a general guideline. If you have the CHP number available, multiply that number by .8. (ie: 450hp x 0.8 ...


2

I just stumbled across this entry in my factory manual, which says that overtightening is the correct procedure. The safe margin is given by rotation rather than torque, however -- up to 60˚ past the point where the specified torque is reached.


1

It sounds like the VANOS seal has failed. The M50TU has a single VANOS that adjusts cam timing at a single point based on RPM. Here is a good article describing the failure symptoms and the repair procedure. http://www.beisansystems.com/procedures/vanos_single_procedure.htm



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