EdblTx7

so im gonna get my s5 n/a rebuilt but the guy thats doing it keeps telling me to street port it. He ported his s4 n/a motor and it runs really nice but low end power isnt that great! is it due to the fact that he street ported a 6 port? should i do it? i need some advice from someone familiar to a situation like mine.

sunshine

Generally, the bigger you port, the less low end you will have. Its a good idea to port if you can afford to do it. But on a street N/A enginem I would say to keep the porting mild. Most builders will have a variety of sizes of ports within the SP category. Just ask for the smallest SP you can get. That'll get you the best of both worlds.

-a

rowtareh

Also take into consideration of an ECU, or a piggyback air/fuel manager.



Sunshine-good point on the bigger the port the less low end power. Bridgeports you get no power below 3k-3.5k rpms. p-port, kiss your low end power good bye. might as well shift at 6-7krpm.