Hey everyone I'm hoping y'all can help me with a problem. I recently installed a 16% pulley from WMW. Got the kit with colder plugs. Also installed detroit tuned bypass valve and serviced the supercharger. When I go 75% to full throttle it feels like it's missing( light, quick sputtering) of and on through the rpm band. Sometimes it doesn't happen at all. Narrow band gauge says I'm staying rich so I don't think I am leaning out or anything. Never happened before the pulley. Mods are cai, 2 1/2 exhaust, and the above. Any suggestions?

 

Ecu might need to adapt to changes, if not I'd check your coil or wires.

 

We see this more often with the R53s getting older as they often still have the stock plug wires which are worn out. The extra boost puts load on the ignition system and the old wires can't keep up.
http://www.waymotorworks.com/wmw-per...lug-wires.html

Or a corroded coil pack terminals. So I'd check those first.
http://www.waymotorworks.com/screami...-coil-pak.html

 

Thanks for suggestions. I will put some wires on at lunch and check coil ends.

 

Scotch Brite the coil towers and a fresh set of plug wires and all is well. Thanks for the help.