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NoDOHC · 12-09-2010, 12:17 AM

The ports are shiny, the rotors look to be ok (you will need to check clearance to be sure).

I don't like the shape of that port. This design is giving up significant low end without making any improvements in the high end because that port has about a 15 degree later port close, but it is at such an awkward angle that it will not help chamber charging at high speeds.

For what it is worth, I made 138 WHp on a bone-stock s4 6-port block, factory ECU, modified AFM (lean the mix up a little) and stock exhaust. Stock intake manifold too. This doesn't bode well for the porting on your engine that made 14 Hp more stock than mine. (What I am thinking is that the port design is actually hurting your power.)

If I were you, I would start with a new stock center plate and port it yourself.

Otherwise, it looks like you got an excellent starting point.

12-09-2010, 12:17 AM	#2
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	The ports are shiny, the rotors look to be ok (you will need to check clearance to be sure). I don't like the shape of that port. This design is giving up significant low end without making any improvements in the high end because that port has about a 15 degree later port close, but it is at such an awkward angle that it will not help chamber charging at high speeds. For what it is worth, I made 138 WHp on a bone-stock s4 6-port block, factory ECU, modified AFM (lean the mix up a little) and stock exhaust. Stock intake manifold too. This doesn't bode well for the porting on your engine that made 14 Hp more stock than mine. (What I am thinking is that the port design is actually hurting your power.) If I were you, I would start with a new stock center plate and port it yourself. Otherwise, it looks like you got an excellent starting point. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)