hey guys I'm in the process of building an engine for my s4 TII. Im a little undecided on which route to take if i should go with a large streetport or if I should go with a bridgeport. which route should I take for more and easy HP and running lots of boost. this car will be driven to regularly not my dd but it will be used every once in a while and will also be used at the track so I need something powerful but at the same time reliable and durable. I already purchased all the stuff to close the engine SCR apex seals and springs, original side seals and springs, atkins solid corner seals, original 93 corner seal springs, original O-rings and springs for the rotors, new original bearings and the original master rebuild kit you know gaskets and coolant seals and all that other crap all i need is to do the ports and close the engine so i need some advicing from you guys. once i close the block and start working on it i will start a thread to share all the fun with you guys

thanks in advance.

 

If its not a DD do a bridge that doesnt cut into the water jackets. Quicker spool, more power with less boost.

 

Bridgy

 

bridge port. go big or go home.

 

Streetport, you will have better low end and if your not trying to make every last hp you can there is no need for a bridge.

 

If its not a daily no reason to not bridge.

 

j-bridge

 

what about a periphial(sp?) port is that any better than a full bridge?????

 

I wouldnt P-Port if you want to drive it on the street.

 

just go street port more that enough power and reliable

 

aux bridge, cause i daily drive one and it sounds sexyyy

 

Peripheral porting decreases engine life significantly.

Great Porting info ----> http://www.turborx7.com/portingpictures.htm , its got pros and cons for every porting type also.

 

yeah I already decided on not going with a (PP)

 

You can adjust your porting to get something in between...it's not just black and white.

 

yeah thats where I'm sitting on right now. I guess that will give me a little balance between power and durability.

 

how about you tell us what turbo you plan on running.

 

i'd go large street if it were me

 

How'd you aux bridge a turbo engine?

 

its the worst idea ever. its done just for the sound.


just Bridgeport the damn thing.

 

My point is, where are the aux. ports on a Turbo Engine?

I could understand if it was half-bridging the engine, by only bridging the secondary ports, I wasn't aware that turbo's had 6 ports to bridge! (primaries, secondaries, auxillaries)

 

I'm still researching on what turbo to buy. something bigger than stock but not to big for faster response.

 

A p-port is better than a full bridge, but it may be expensive to rig up.

The 787b ran an NA p-port instead of a turbo for reliability reasons. And it's engine was still in great shape after being battered at Le Mans. OTOH it also got much better gas mileage than the pistons racing (and PP's have horrible mpg), so maybe that's not saying much.

 

i dont disagree with you on the PP not being the best option for power its just not the route i want to take

 

False. Bridgeports make more power across the entire powerband due to making the turbo spool faster.

A bridgeport will reliably make more power across the entire rpm band, all else the same, just as reliably. The only determining factor is idle quality, and putting up with the annoying BP sound.

 

They don't. Turbo engines are 4-ports. Aux BP's are a waste of time.