[HWYSTR455]

Originally Posted by hurryinhoosier62

Closed lop or open loop? MOST factory EFI systems with closed loop can't "keep up" with a tight LSA. Most cam manufacturers advise you to stay with a loose LSA IF you're running an OEM closed loop system. I could be wrong, but I believe most aftermarket EFI systems recommend an LSA of 112-116 degrees as well.

I believe that is a correct statement, that most aftermarket EFI suppliers do recommend a 112-116 LSA.

There are some caveats to that though, for example, throttle body injection as compared to multiport. Mutliport systems are more sensitive to LSA, or at least that's what I've seen/heard.

I have also seen/heard folks having issues with throttle body injection systems when the LSAs get into the 106-108 range, to a point where some either ditch the system or change the cam. In those cases closed loop is ineffective, and many statically map the fuel curve. When you think about it, you're pitching one of the basic reasons most even switch to EFI.

.