Anytime I take a hard right turn with acceleration... The engine sounds like it revving, but it's not. Might it be some sort of anti-slip control going on here? It just doesn't seem right. Also it seems to be on 'right' turns only... But this could be false as I don't take many hard left turns daily driving.

 

It could be the DSC kicking in. I had that issue on my older tires but went away after I got new ones. It seems like the revs are jumping but you're not doing sudden accelerations.

This also happens on the tuned JCW if I try to do WOT when it's damp out(my summer tires do need to be changed though).

 

If the engine "sounds" like it reving it very likely is reving. Sounds like the clutch is slipping to me or maybe you are spinning the tire. Doesn't explain why it would only happen on right turns.

 

Soft suspensions, driver weight, could be why it only does it turning right.

 

You're probably right Izzy...Good suggestions.. Quite possible this is what is going on... But i DON'T like it. Notice "modulating throttle" (last sentence-first paragraph)

FUNCTION: ASC & DSC work with the ABS system to provide enhanced vehicle stability.

ASC - Automatic Stability Control ASC uses speed sensors at each wheel and throttle position to improve traction by applying the rear brakes if the rear wheels spin faster than the front. It can also shut off individual fuel injectors and close the throttle valve to help maximize traction. ASC also acts as a virtual limited slip differential by detecting a spinning wheel and applying braking force to just that wheel until traction is regained. AWD models (the BMW xi) use ASC-X which monitors all 4 wheels to provide limited slip differential effect. The ASC system also provides traction control by modulating throttle, ignition timing and braking force to maintain traction.

DSC - Dynamic Stability Control DSC builds on the features of the ASC system. While ASC functions only during acceleration and braking, DSC functions during all driving conditions such as cornering and emergency maneuvers. Additional sensors are added to acheive this level of stability such as lateral, yaw, brake pedal, and steering angle sensors. In DSC, each of the three subsystems: ABS, ASC, and DSC have jobs to do, and these are: ABS: Cornering Brake Control, Electronic Brake Proportioning ASC: Brake Intervention (or ABD-Automatic Braking Differential), Drag/Drive Torque Reduction DSC: Dynamic Brake Control, Maximum Brake Control

 

It's probably the fact you don't have a limited slip differential in the car. It is spinning the inside wheel. Is there a little flashy light in the tach?

 

No flashing light(s). I thought the same if it was the DSC OR ASC kicking in. But I never see any warning lights when the pulsing effect or reving happens during a fast turn. It smooths out a few hundred feet straight out of the turn. It never happens going straight.

 

UDPDATE: it was the cam chain tensioner causing the bad noise. Replaced under warranty and no more noise.