Help, only dynoing 300RWHP

[Locobob]

Originally Posted by rhipsher

HOG there was no tuning done at all. That was simply the result of the top end porting alone. Corey simply laid down the before porting run done 4 years earlier over the after porting run so I could see the improvement over the before porting run. Im still running stock cats and exhaust which doesn't compliment the top end port at all. Once I get the proper headers x pipe and a more free flowing exhaust system with a fantastic Corey tune I'll be curious to see what kind of numbers it will produce then. But even with stock exhaust, top end porting makes a difference either way

I'm thinking the different A/F ratio's have a lot to do with the lower rpm gains, I've never seen intake porting pick up much below 4K. Porting should lean things out a bit although your A/F curve seems extreme. Hmmm 4yrs apart.... ethanol maybe?