dan lephart
Member
- Joined
- Nov 10, 2002
At WOT, 15# boost, stock pump, injectors, pres. reg. with and upgrade chip for 93 octane I notice a pinging like poor grade fuel... I use marathon 93 or sunoco 93 and get the same result. Switch to 94 sunoco and problem goes away. Need a different chip or switch fuel? Valve spring upgrade any help? Am I hurting things running it on 93 @ WOT with a ping? When I started out this spring with old gas the ping was apparent untill I got fresh 93 in the tank. 
