Belt slippage after upgrading to SI trim and turbo guard filter

Originally Posted by redondoaveb

Mike,
You might try the K071040 belt. It's a little shorter than the K071045. I believe that's the one Topgunz sold with his kits. He may be able to verify that.

Also, take a flashlight and look closely at the supercharger side for bekt dust. You would see it on the stillen bracket, usually behing the jackshaft pulley and on the rear case of the supercharger. When my boost dropped off that quickly, I had belt slio on the sc side.

Oh yeah, by the way, it doesn't surprise me that your boost is dropping off at 7800rpm. My car made max boost at 7k rpm and then leveled out until 7500rpm and dropped off after that. At 7800rpm, the tuner stopped the pull. It made max hp at 7400rpm but boost had leveled off at 7k.