You won't see the full potential of the porting until you install some sort of header w/straigh pipe (or hi-flow cat if you have emissions). But you WILL feel a bit of power after the 6-ports open up. IF you get a header, then you will feel a RUSH .

 

yeah I figured I probably would not see much of a gain. But for a free mod, I just could not resist.

 

I think I wanna do it, if I can find the time. No headers here, but one of those Rotary Performance pipes (with no cats) and a K&N type cone intake. Should I have gone with the headers in the first place? I just figured it would be quieter this way, and I can slap the cats back on easy if I want (I kept the air pump). Am I gonna see some ok power gains?

Thanks for the mileage info.

 

Youll see good gains. The header argument is misleading. Headers and acat replaement pipe arent really much better than stock exhaust manifold and arace pipe, like the RP one. A free flowing exhaust and intake will maximize the performance of the ported manifold. Headers are not a requirement.

 

Is it normal that my rev buzzer is now hitting between 6000-6500?

Overall I am pleased with the results. I had to wire the aux ports open again, they are still not opening?????
BUt now my car lags worse than an old 930 hehe

 

No... that's not normal... mine is still at 8k sharp (7k for S4). I think your tach may be off or something is screwed up. Just search for 'early redline' or 'buzzer comes on early' or soemthing like that. I know it's been a common topic.

Yeah, you really need your 6-ports to be functional with porting, otherwise you will actually LOSE torque .

 

So nobody has done this on a turbo II before? any body know of the gains? would it be worth the time? now that my car is down Im itchy to port something.

 

I did it. Its worth some power. I massively ported mine with a Dremel.

 

ok so i go get a dremel(any dremel?) and follow the pics in the beging of this tread. now how long did it take you to do this? ive never ported anything so i gotta get some guidelines i guess. and how will i know when enough is enough?

 

Any one know if it would work on a 1st gen GSL-SE (13b) ?

 

it's porting manifolds. it will work on any car that has manifolds. you are just smoothing out the air flow as much as possible.

 

Yup, it'll work on all cars. Nice thing about the rotary is it always responds better to "air mods" better than pistion engines. Remember, by design, EVERY stroke is effecting the other strokes. So, an easier intake and exhaust means an overall faster revolution of the rotor. In a pist-0n engine, the power stroke really isn't being held back by intake and exaust in the same cylinder.


I say, GO FOR IT!

 

Hi, I have a 5zigen Fireball Exhaust system (muffler/midpipe) and just installed a high flow downpipe with a single high flow cat on it. If I were to port my engine, would I be noticing a significant gain in performance?

 

it wont affect emmisions will it?

 

Just porting the engine wont affect emissions at all, so long as you don't mess with the cats, or the rest of your exhaust system. But you should check the laws of your city/state if you havent already, because here in Minnesota, we recently had all of our emission laws thrown out the window, so now we don't have to worry about any of that

 

!

OMG another bloomingtonite! cool.

 

hehe, i feel special now :P

 

 

OK...I just ported my 88 SE and I put it back together and now when i start it up it does the warm up thing (idols at 3k until i tap the gas) but then WON'T IDOL at all. It drop down to about 1k , stutters, then shuts off. Now what should I do??

 

Find the vacuum hoses and/or sensors you forgot to plug back in.

 

Happens to me everytime. hehe

 

Agreed, vacuum/intake leak. Symptoms : exactly what you described .

POSSILBY, you could have fucked the cold start screw and/or linkage/assembly.. if so compare the entire throttle body to spec in haynes or FSM... be sure to read if it's for COLD or WARM. But this is highly unlikely if you read my warning in the write up .

 

check for the vacuum leak, mine did that after porting but i also took off the bac. after staring i hold the revs with my foot up at like 2000 for 5 min in the driveway, after that it idles roughly but it holds idle. check all of the idle adjustments as per fsm and make sure the tps is set.

 

If porting your maifold reaps good gains, then why didn't the Mazda factory plant do this for better results?

 

costs more? I dunno....

Why didn't they put on headers or a cone filter? Why did they implement a useless sub-zero starting system? Why did they use faluty PD's? Why didn't they use a ball bearing turbo (which they DID consider)?