I want to street port my motor before i put it in the car... so I dont have to pull it later on to do it.. but i do not have a stand alone computer or any other piggyback or AFC. will the stock computer work for a little while untill i can get a Haltech or something. I have to put a motor in the car now and dont wana pull the motor twince.

 

Hmm...good question. I want to street port my engine soon too and never really thought of it. So anyone know?

 

Yes you can street port your engine and use the stock computer without any Safc, etc.

 

Good to hear. I am planning to get a S-AFC just to have some control and to tune it just right anyways.

 

Run a pair of 550's in the secondaries, and you should be fine.

 

Ya I plan on putting the 550s in there as well later on, but just like the idea of having some control.

 

i have a 91, so my engine is a little different. i run a street port with the factory ecu with no probs except that it stinks to high heaven at an idle. course i dont have any emissions either.

 

rotorhead1 do you have any 1/4 mile times?

 

no sir, no 1/4 times.

i prefer the curvy roads to the straight lines. all the racing i do is autox.

 

Hmm..I never auto-X'd, seems like it would be pretty fun. Don't people hit each other alot? Do have an idea what kind of 1/4 mile you would need to be around to do decent? I mean your car has to be pretty quick in that too.

 

I drove my car around with a big street port with the stock ecu. Ive been breaking it in until my Haltech is finished.

 

i daily drive my car with a smaller sized street port and stock ecu. My street port is as far as you can go, while not changing the idle, and if need be, will still pass emissions CJ

 

What kind of increase did you see? Have any HP #s?

 

autox is a time trial. no hitting other cars and marring my beautiful rex. also it is usually in a parking lot with plenty of room so you dont hit poles or walls or anything. i think my car is pretty quick all around, not deadly fast or anything, but about right for my driving skill level. with the mods i have i am only about 2 seconds off a stock FD on a 60 or so second course (i have recently beat a stock MR2 Turbo) whereas when running stock class i was more like 5 or 6. in my opinion autox is the best clean fun you can have in your car. its perfectly legal.

 

Ya you will have no problem with the stock ecu. Although in the future you may want to purchase an S-AFC. They are always a good investment

 

hmmm...i would think,running 550's w/o some kind of aftermarket fuel/air controler would result in a rich condition..at least at some rpm's.i was talking to the guys down at mariahmotorsport the other day,and they where telling me that they always set up theyr engines slightly lean,according to them they make more power that way,rotarys actually like to run on the lean side.of course u needtomake sure ur cooling system[and oil] is top notch.and,they use standalone computers for theyr n/a's.i know mazdaspeed7 is running 550's w/o a afc,so it must work ok,but i still wonder.seems,if u where running 550's,u would at least run a afc.later
david

 

I don't know about anyone else but I would not run lean, ever. Theres one thing performance is not worth, an engine! Running lean is a rotary-killer. Those guys are pros that know exactly what they are doing so I advise no one on here to try to make their car run lean at all themselves.

 

jeah,sorry,i should have pointed that out,as i share that oppinion,for most peolple.however,i still found it a interesting bit of information.
d

 

Ya and those guys are going for all-out performance. They aren't like us, that actually drive our cars. If they blow their engine they will just rebuild it themselves for dirt cheap in like a damn day or 2.

 

I have no dyno numbers, but it beat a sho taurs couple weeks ago, with a couple little mods on it. I plan on getting a bigger maf, and hopefully soon, am going to run dual 2" exaust all the way out. Mandral bent, and no collector of course. Hopefully it'll all come together by march. Check my sig to see what i've done to it. CJ

 

By the way, n/a rotarys don't mind being a little lean, unlike turbo cars. CJ

 

Hey,

This is probably a stupid question, but I'm new to this. Did you guys port your own engines? Is it possible for a home mechanic to port their own engines? I'm thinking of getting a FC for a project race car since i'm taking some time off from college. Thanks.

Wiill

 

Yes it is possible. I won't try to do it since it only costs a few hundred dollars but you can do it. I believe they sell templates to go by like at www.mazdatrix.com too.

 

Not for N/As.

I used to run dead-lean at the dragstrip and on the street with my N/A, and it never detonated, it just didn't make as much power.

Detonation kills turbo engines. Detonation kills nitroused engines. You have to work extremely hard to get a N/A to detonate, and lean mixtures won't do it... it can run so lean that it misfires (done that, too ) but it won't build pressure/temperature enough internally to detonate. You need to do stupid things with ignition timing (like get your trailing leads mixed up.... done that too ) to detonate a N/A. And even then it probably won't die, just because N/As don't really build fatal amounts of internal pressure.

- PJ (Gee the O2 monitor reads .005v thru the traps, is that bad?)

 

As rotorhead1 said, you don't have to worry about crashing. Autocross is about as safe as it gets in motorsports. You also don't need to worry about how quick your car is for some period of time because you will be the determining factor of how fast or slow your times are, the car will keep up with your abilities. Many people have a hard time memorizing the course the first time or two (damn cones all look alike and they sure come fast). However, if you'll ask for help and spend the time to learn, it's great fun, a good adrenaline rush, and you'll be a better driver. Check out www.autocross.com for info for your area.