Rotary Car Club - View Single Post - help, looking to build a bad a$$ 6-port?

NoDOHC · 11-19-2010, 05:40 PM

Your biggest power adder would be a custom intake. I think that the lower part of the factory one could be modified to be passable, but the upper part has to go.

I would recommend not using S4 parts, but S5. The rotors have better compression and are lighter.

What power levels are you looking for?

I have heard of an Aux Port Bridge, which will help the high end appreciably while maintaining some semblance of low end torque (not a bridge port until the sleeves open).

Unfortunately, I have never had the opportunity to build a maximum effort 6-port, but my mildly ported 4-port has 60 WHp and 60Wlb-ft on the best 6-port build I had (Haltech E6X, stock - polished intake manifold, port matched with custom cold air intake - no AFM, stock S4 block), Racing beat headers,

4-port vs. 6-port
216 WHp vs. 155 WHp
160 Wlb-ft vs. 100 Wlb-ft.

Short story is the the 4-port has a lot more potential than the 6-port.

The 4-port loses torque in the high revs because the stock ignition is weak past 6,000 RPM. The charging efficiency on the 6-port is so low that the ignition is plenty for it.

11-19-2010, 05:40 PM	#2
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	Your biggest power adder would be a custom intake. I think that the lower part of the factory one could be modified to be passable, but the upper part has to go. I would recommend not using S4 parts, but S5. The rotors have better compression and are lighter. What power levels are you looking for? I have heard of an Aux Port Bridge, which will help the high end appreciably while maintaining some semblance of low end torque (not a bridge port until the sleeves open). Unfortunately, I have never had the opportunity to build a maximum effort 6-port, but my mildly ported 4-port has 60 WHp and 60Wlb-ft on the best 6-port build I had (Haltech E6X, stock - polished intake manifold, port matched with custom cold air intake - no AFM, stock S4 block), Racing beat headers, 4-port vs. 6-port 216 WHp vs. 155 WHp 160 Wlb-ft vs. 100 Wlb-ft. Short story is the the 4-port has a lot more potential than the 6-port. The 4-port loses torque in the high revs because the stock ignition is weak past 6,000 RPM. The charging efficiency on the 6-port is so low that the ignition is plenty for it. __________________ 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)