Hi guys, I'm trying to find out what I can do to achieve my goal of 200-250hp out of my 13B NA. It seems like a full exhaust and intake is the first thing on a lot of peoples shopping list when hp gains is the goal. I've read about street/bridgeport and carb setups. But I honestly couldn't find how much hp/torque gains they would produce.

So I turn to the pros on this awesome forum for guidance. How would you guys approach it? What supporting mods would you do with what port job?

Any links to other threads would be great as well.

btw in case you were wondering I drive an NA S5 with 160k kms that is completely stock except for a K&N drop-in filter.

 

The short answer is that you don't, at least not without a great deal of effort. A great deal of effort (headers, intake/filter, mild port job, full standalone and a good tune) will get you right around 200HP at the wheels if all the starts are in alignment.

Now if you are willing to venture into unstreetable territory, the sky is the limit. A half bridge and all the goodies that go with it (standalone, custom intake manifold, insanely loud exhaust) makes 250HP easily achievable. Full bridge and you are around 300HP at high RPMs and being deafened by the noise.

Peripheral port the sucker with everything that goes along with that (standalone, full custom intake manifold, ridiculous unbelievable wake the dead exhaust, lightened and balanced rotating assembly, good tune) and 400HP is about where you'd be.

Don't even consider a carburetor. They belong on yard equipment.

 

Wow, thanks for the info Aaron! Really appreciate it. What makes a bridge port unstreetable? I'd still like to be able to use my car as my daily driver. Seems like my goals are a little out of reach. I guess the only solution is a swap.

 

Bigger ports make power higher in the rpm band, and a crazy loud, so loud ricers and choppers will be annoyed. Ur goals are easy with a 13bt swap and it be cheaper too

 

Is it possible to get to around 180 or 200 horsepower? i want to make my s4 mechanically tuned machine that can handle like a beast. Is it possible to achieve that without porting the engine at all?

 

Makes sense. Thanks for the info! I guess I'll be looking into doing a swap

 

Quite possibly the best thin I've read so far lol

 

If you go that way I have a 88 turbo car and new engine you can swap from pm if intrested

 

Swap then port the waste gate with an intake and exhaust ull be there, little bit safer with a rtek chip and bigger secondaries

 

Aaron Cake couldnt have said it better! some good gas helps too E85 is the more streetable approach and maybe some C16 which will be the weekend warrior approach...

 

13brew produces around 250hp stock. You could probably find one out of a wrecked FD complete with the wiring harness and ecu and have a streetable legal car for about $1k if your willing to do the work. (here in Cali if you mod your 13b your looking for a lot of trouble with smog laws) luckily if you swap your engine to a newer one and keep all of the original smog equipment then you can get away with a legal smog. It all depends on what you want, also make sure that you do a lot of reasearch before you jump into something as big as a bridgeport or steetport. I'd suggest having it done by a reputable rotary shop in your area if you plan to go that way. Beware it can get quite costly. Anyways, best of luck and cheers.

 

What makes bridgeports unstreetable by most definitions are the effects of high overlap ports: loping idle, reduction in low and midrange torque, and **** poor fuel economy.

Now with a properly tuned standalone, bridgeports start every time, don't buck and are quite drivable (lack of low/midrange is noticable by not a deal breaker). With carburetors they are nightmares.

However the 8-10 MPG in the city can't be tuned away. Overlap is overlap, and everything must give way to physics.

Another problem with NA bridgeports is that to get the gains from the port, the exhaust has to be WIDE OPEN, as does the intake. Both generate considerable noise. How much noise? You'll be banned from most tracks.

Turbo bridgeports have fewer of these problems because the turbo keeps the noise down, and boost compensates quite well for lack of low/midrange because the bridgeports improve turbo spool dramatically.

The joy in the NA rotary on the street is the revving fun and the handling. So just put a nice catback on there, a set of headers, a few resonators and a cone filter with cold air box. Keep the car tuned up, and if you want to go farther then use a device like the S-AFC to tweak the fuel curve (they run pretty rich from the factory). That will make a fun and lively car. Then as you suggest, suspension is what makes it a blast to drive.