I am rebuilding/porting my streetported (previous owner) s4 tII. I realized that the intermediate housing wasnt ported on either side. Are these supposed to be ported? I thought you ported all ports in the engine. sorry for the noob question but it is my first rebuild.
thanks,
spencer

 

Somtimes people leave the primaries unported, maybe just cleaned up a little. Most later center housings don't have a lot of room to open up the ports, I don't know about the Tll's myself.

 

I think it helps with keeping a steady idle basically tunes it down a bit to make it more streetable less gripe ya know. Oh and Spencer I would probly port your motor I just picked up my templates from pineapple this week PM me for info

 

Im actually finished bridgeporting. I got racing beat's template. Thanks for your guys' reponses. So basically porting the housing would make it unstreetable?

btw I have your tranny chillin in my driveway, I think you can pick it up sunday if you wanted.

 

people leave the primarys unported to be more streetable. basically giving it better low end. the larger you port the primarys, the higher your going to have to Rev to make power. i use to have to shift my old TII around 3500-4000 or the car might stumble or struggle to get up to speed. the primarys had a HUGE port. but my other TII had medium sized port on the primarys and feels very strong down low and i shift it at 2500 for daily driving. also medium size port on the housings. clean idle, not that loud at all...

if you already bridged the secondary ports. i would port the primary, but not to large, unless your going full race. but do NOT bridge the primarys...make sure the exhaust ports are ported enough to let the motor breath, but not so large your shifting at 5k to make any power and idling at 1500...

No, it would not be unstreetable. its all what YOU consider STREETABLE. some people consider P-Port streetable...

 

personally, i'm at the point where i think that whole concept is a joke now. all of my streetports, up to this point, have idled steady and considerably below 1000 RPM. the whole thought of not porting the primaries for idle and better low end seems like a good concept, but for whatever reason appears to be myth to me. it's totally a matter of how you port them.

 

before the rebuild, the car was dyno'd at 340rwhp. I had no problem whatsoever driving it daily, so maybe my idea of streetable is a little different. So should I use the same template i used for the secondaries just without the bridge?

 

that would definitly be to big...in my own opinion. i have never ported the primarys that large. and i think you just might hit a coolant passage...but dont quote me. maybe someone here knows better.

one thing to think about. once you grind out the metal... its not coming back. so if you port to big, your stuck with it. or stuck with buying a new housing. you port to small, who cares. theres unported 13b's making 500+ HP.

 

I had a streetable 1/2 bridge 13b, personally i would leave the primaries stock and get the best of both worlds.

 

I've got pineapples medium porting template its got templates for both intake ports if your interested also you got a set of spanner wrenches I could borrow?

 

I've got a 12at block in my S2 rx7 with bridgeported primaries and secondaries.

Perfectly streetable car

 

The metal can come back, you just have to buy it from Devcon!