What VCT settings are you guys seeing reaps the best benefit for these 18 manifolds on s197s?
A customers vehicle lost 4 MPH in the eighth switching over to the 18 from his stock mani.
My current VCT settings are roughly on intake
-50 from idle til 2k rpm, -45 til 3k, -40 til 4k, -30 til 5k, -20 til 7k
On exhaust
0 til 2k
And tapers to 15ish
I would still expect some sort of power gain alone with the intake. I'm assuming something else might be an issue. Throttle is not shutting. maf curve didnt really need any changes, had about 7% too much fuel, obviously indicating loss of power.
Any hints on vct settings? Thinking of retarding the intake cam even more after 6k. Maybe 0*