I searched and read bits and pieces. I'm looking to port my engine in the near future but I dont know much at all about the different types of ports. So far I've heard street port, large street port, 1/2 bridge port, bridge port and extended port. I read that bridgeport can make up to 250hp if tuned properly and ran on a standalone.

1) What kind of horsepower would a 1/2 bridge port put down and would u still need the standalone?

2) I know that bridgeports effect the engines longevity but how many miles can you put on to a bridgeport before you need to start worrying?

3) Would a half bridgeport last longer?

4) How much horsepower can you gain from a large street port?

thanks a lot guys
really confused about all this just need some clerification.

Matt Burtini

 

Cheese Port!

 

thanks J. :p

 

take a look at my post...... https://www.rx7club.com/2nd-generation-specific-1986-1992-17/i-would-like-see-pix-your-port-jobs-435807/ all about porting... alot of pix, pix of mine.... LQQK @ IT!!!!!!

 

well thank you for all the images. It gave me a better idea of what the ports look like but it still didnt answer my questions.

Thank you though.

matt
plz post if you have any more info, ill take whatever i can get :P

 

Does anybody have any basic knowledge on porting? I'm trying to decide what I want to do so I know what I want and how much I need to get it done but I want to understand it a bit better. I've been searching and researching and im just down to the 4 questions listed above.

Any help is apreciated thanks
matt

 

first of all, it would help to know what kind of 7 u have. and how much power you want to make.

 

i got a s5 tII. No specific desired horsepower... I just like what I'm at, then want more late. Right now its at 240 at the wheels and im wanting a bit more... injectors, fuel pump, exhaust, intake, t3/t4 turbo, s-afc, ported waste gate, blow off valve, FCD is pretty much all thats done. Thanks. ONe thing I'm curious about is why people get mild street ports instead of large ones? Are there downsides to larger street ports that I'm not aware of?

 

The main thing I know of as a downside to the larger street ports is that you can get a bit of a lumpy idle with a larger street port, but nothing too bad (unless your TPS is out of calibration like me). Other than that I dont know of any reasons not to get a larger street port.

 

A bridgeport NA can make up to 250 HP if tuned with a standalone. A bridgeport T2 with a standalone, would make CONSIDERABLY more power than that, heh. Notice, with a full exhaust on you're T2, you had to have made quite a bit of horsepower, if it was quality, anyways. With all the mods you listed, you should have a bit more then 240 HP ?
With those mods, you should have considerably more then 240, No doubt in my mind. S5 T2, Something like (170?) HP to the wheels stock, exhaust/intake, exhaust done right would be an easy 30HP, Intake, depending on how you did it, is +/- 3-5 HP, Fuel pump+injectors/S-AFC/FCD, would set you at like, give or take a few, 230-240 HP at the wheels. But then a T3/T4...You'd be looking a little over 240 I think. Anyways, off topic, Street Ports last a lot longer then bridgeports, as the "bridge" or, the part the side seal rides across, tends to crack after use. Not sure exactly how long it can last, but I think you can make the bridge thicker (not massively, 1/30 inch thick like I've seen on a bunch of car's..) so it won't crack under such little use. Stand alone is a must for bridge, as you're idle will need to be set higher, more fuel, etc. Large Streetport, drawbacks include slightly less engine life as far as I know, and bad emissions.

 

And you thought I was joking?



https://www.rx7club.com/showthread.p...ht=cheese+port

 

Throw away that POS turbo and get a GT35R and go from there...


-Ted

 

There is no way to answer that question without more information on what turbo setup, EMS, other mods, etc. that you will run. Your current setup will not work well with a 1/2 BP, so you'd need a larger turbo, standalone EMS, FMIC, more fuel, etc. Yes, a standalone is highly recommended in order for your car to take full advantage of the port (power-wise), idle well, not grenade the engine, etc.

That is entirely dependant on the size/location of the port. If you cut into the water jacket or don't make the "bridge" wide enough, don't expect it too long (20k miles maybe). If you run a smaller bridge (and don't cut into the water jacket and keep enough material between the port and the bridge) there isn't any reason it should fail any sooner than any other engine.

Again, entirely dependant on how the port is done. See a theme here? There are no absolute answers, there are too many variables. In general, I guess you can say that a properly sized "streetable" 1/2 bridge would theoretically last longer than a full BP because it puts less stress on the engine.

Once again, too many other variables. Size of port, other mods, etc. Generally speaking you can see a 10-20% increase in power across the board vs. a stock port.

 

Why would anyone do that? Just connect the freaking dots and be done with it

 

a bunch of tiny ports? seems like it would just cause turbulence. Maybe they are pilot holes and the guy didnt finish forming the bridge.

 

Yeah, if you go to the link under the pic, they said that it just created turbulence.

 

http://www.mazdatrix.com/faq/porting.htm

Ah ha! Info!

 

ya well this t3/t4 turbo came with the car but I do play on getting something else. 60-1 or something I'm not sure I need to look into that. Thanks for the help