6 port streetport turbo
 

Hi all, new to the forum

Is it good idea to streetport my engine while rebuilding it?
Its a 6 port turbo... trying to have some bottom end.

Thanks
Kyle

Streetporting your engine will make you gain mid/top-end power , while sacrificing your low end.

Streetporting opens up the ports so they more air can flow, but air will move slower through a bigger opening when its at a low rpm.

Street porting is done for making more peak power, which is made at high end, around 6500rpm.

If you want more low end you'll want a faster spooling turbo(a ball bearing turbo), boost will also be made faster if you upgrade your exhaust if you haven't already, as well as a dyno tune.

Can anyone else add to this?

I hope I'm not completely wrong with what I said

If a street port will help build boost faster that will help low end , but I'm not sure if it will... ??

Rotary >Pistons

Almost any porting you do on the 6 port block will reduce low end torque. Especially in a configuration (which I assume you are running) which eliminates the aux port actuators to fit all the turbo stuff.

As a 6 port turbo isn't a standard setup, it would help to know a bit about how it was converted. What intake manifolds were used? What turbo?

6 ports already have HUGE port area with very late closing timing when all ports are open, so there's not a lot more to do on the secondaries/aux if you want to maintain low end. In a turbo configuration, I'd port the primaries up a bit for a more duration and better chamber filling, then port the exhausts down a little just to get more energy to the turbine. Won't have too drastic an effect on low end.

Thanks Aaron Cake for the reply. I've read your site write up's numerous times.
More info and pics in the new year when it's a little further along.

Thanks
Kyle