My 2010 JCW R56, with some mods - lets out a fairly loud "chirp" when accelerating off the line in first gear, no matter how aggressive the launch. Sounds exactly like a bird lives in the drivetrain? Not tire chirp - driveline chirp.

Mods include, NM Engineering springs, torque arm bushing, intake - 18" OZ wheels - can't imagine any of that matters?

Any ideas?

Thanks

 

Video of sound?

 

Could be your springs not sitting on the perch properly

 

@SooperCuperErik

Checking that suggestion first...thanks very much!