Jonlisle81

Alright everyone...I blew my motor in my 89 N/A. Now it's time to rebuild and I'm going to have a j bridge porting done. I was just wondering if I am going to require some fuel system modifications to accomodate this new engine mod.
My current mods I have an Apexi filter and true duel exhaust w/racing beat mufflers( http://www.mazdatrix.com/r-ex86nt.htm ). This is my daily driver. Since I blew one of my apex seals and God knows what else, I'm force to rebuild the motor asap so it doesn't rust to death. My funds are limited but I am going to be buying new plugs, wires, and a pulley, in addition to the rebuild.
What I need to know is if I will NEED to upgrade my fuel system due to the bridge porting? I have no type of aftermarket engine management and hope that the port won't require one to run safely. I will be saving up for engine management in the near future, but I was hoping that I wouldn't need some sort of piggyback until then. Will I need an afc? Or could I just temporarily have a shop add more fuel through the new pump and regulator.
Any info you all could give me will be highly appreciated. Thanks in advance, Jon.

RETed

Stock ECU cannot handle a BP.
A piggyback isn't going to help either.
Go carbs or aftermarket EMS.


-Ted

drago86

Ito's done it,.. i'm doing with a aux bridge,.. they only problem ive run into is the stock s4 rev limiter at 7800,.. but he wont have that problem. I agree that a standalone will make more power but he'll be able to drive it untill then fine.

To answer the question,.. the stock stuff is good for around 230-40 flywheel hp, maybe a lil less with the rich stock maps. wether or not you will need fuel upgrades will depend on how much power you make. If you do run out of fuel you will need to get a bigger fuel pump and larger injectors both because the NA fuel pump/ injectors run out at about the same point. Youll then need a s-afc atleast to control it. Stand alone or carb with a non stock manifold is the best way to go, but you can get running fine with the stock stuff.

RETed

What was done to it?
Do you have a link to the details?
You read "J bridge" that the original poster was asking for, right?


-Ted

razorback

my car was running a half bridge using stock ecu and 800cc secondaries and a hks safr (it really messed up after i put in the safc2) its possible. would i reccomend it? NO

RETed

"half bridge" = J bridge?


-Ted

razorback

i that a question? or are you being a smartass? (hard to tell sometimes )

Corbit

Razorback how did you tune your AFR for your half bridge , on a dyno ?

RETed

Yes, I'm asking you the question if they are equivalent and / or what is the difference between the two?


-Ted

razorback

it was already tuned when i got the car, very rich i might add. and i would definately suggest that you dyno tune it (sorry for not responding to your pm)

razorback

half bridge is secondaries ported and i believe the jbridge is ported the end/mid plates and also some of the rotor housings are ported? i just know its a bigger port.

Crusader_9x

from what i knwo and have heard a j port is a hell of alot bigger than your standard half bridge. while i think you could get by on the stock computer with a half bridge i wouldnt want to try on what i know to be a j port/bridge.

razorback

the j bridge also extends into the water jacket, thought so wanted to make sure.

http://www.mazdarotary.net/porting.htm

Jonlisle81

Well it looks like it's going to have to be either and extended port or just a bridge port. Didn't know the J bridge was synonomous with monstor port. I used this as my guide for porting. http://me.a-spec.ca:6001/Rotary/Porting.html
Thanks for the info guys.

casio

ITO did it to an S4; i'm still waiting for results on a stock ecu bridge/half bridge on an S5.
as far as i know, its still pretty much experimental territory (i still dont know if its been done). i searched and asked and didn't find anyone who had done it. both of ITO's bridgeports on stock ecus were S4, though.
if you really want the bridges, i would advise the standalone in the near future. if you do in fact get the bridges done and run it on the stock ecu, post your results. no one else seems to either do this mod or if so, no one seems to talk about it (that i've found).
and i hope you dont have to pass emissions.

my engine/car sat for 7 months dead; no rust. i wouldnt be too hasty on the "asap" decision.

Kim

Im going for a bridged 6 port on stock ecu with 550 injectors, SAFC, MSD, distributor(eurocar).
Most likely custom intake.

www.wankelkim.net/motor.JPG

drago86

Ito's cars were full bridges, theres a video floating around of one of them racing a t2...

casio

Kim, that's beautiful. i think i've read about you doing it before. you may be one of the people i was referring to hearing about it, but never seeing results. good luck with it.
i dont know squat about the euro versions, though i did know you got the distributors. the thing is both the bridged cars Ito ran were S4s. i dont know how well they ran, but i believe he was pleased. i tried finding differences between the S4s and S5s that could give me problems, but all i remember is the AFM. supposedly, and i dont know this for sure, the S4s have a broader range AFM than the S5s. this could be a myth for all i know. moreso, i couldnt pass emissions with the bridges. hell, i havent passed with the streetport (sensor troubles).

Kim

In DK my 86 GLX will pass without any emissions at all, as long as the CO is below 4,5