|
I had the spring and diaphragm fitted to my '88 930 wastegate by RUF. It does increase full boost from 0.8 bar to 1 bar with a corresponding increase in performance (0 - 60 in about 4.6). This is a safe limit for the car in it's stock form but you shouldn't run it any higher as this puts the car to it's thermal limits. The only other thing to remember is that more boost means more internal pressure so if you have any oil leaks (specially at the cylinder head joint) these are likely to get worse. Fixing these leaks means removing the engine from the car followed by a complete top end rebuild !
The gearboxes in these cars are notoriously noisy - whines, rumbles and synchro baulking. You can improve them by rebuilding but unless it's really bad it's just not worth the hassle. Some 'normal' gearbox noises include:
Noisy reverse gear, especially at low speed;
Springing out of gear when changing up (if you have a lazy clutch foot);
peculiar rumble in 2nd and 3rd (but only at 1200 rpm).
Lot's of jobs can be done on this car at home but you will need a fairly extensive tool kit or more than a modicum of ingenuity !
Hope this helps.
|