Two more very inexpensive motor saving/longevity aids should be added to the list of helping a M54B30 race motor stay together.
1) S54 Timing Chain Tensioner.
This M3 timing chain tensioner is a Direct fit and will "firm up" the timing chain from thrashing around as much as it currently does with the stock M54 part. The motor will feel smoother at high RPM with this tensioner.
2) INA (Over-Running) Alternator Clutch Pulley.
Again, this will help smooth out the motor. With the stock M54 solid Alt. pulley, the ribbed belt "whips" back & forth under deceleration from high RPM causing a lot of unneeded vibration.
Both of these parts are Super easy to install, and are cheap insurance at holding a M54B30 motor together under the extreme environment of racing.
Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 SCCA
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"
I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & XI E46's
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
Originally Posted by RacerX
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
Last edited by Rob43; 12-18-2013 at 12:31 AM.