Announcement

Collapse
No announcement yet.

i have a ms2+laptop+ill tuned car. Has anyone tuned a bf 323 before?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    i have a ms2+laptop+ill tuned car. Has anyone tuned a bf 323 before?

    Hi, I have an 88 bf 323. A bpt swapped in, using old 323 gtx ecu harness and vafm. I have lurked around this forum for a long time now, and finally need some help with the tune of my ride. I am in SoCal, and have the car running, idling at 2k rpm, pig rich, and making an ugly noise at high rpms. I thought megasquirt could fix my problems. Has anyone here ever tuned a bf chasis car? The guys on our old forum said it was impossible to get the engine to run standalone on the MS, but they did have some luck with getting the megasquirt to run as a piggyback air fuel adjustment tool. The reason they said MS wouldn't work because the vafm flap was what completed the starter and ignition circuits and ms has no way of simulating the position of the vafm "flapper door".

    I have read the MS posts on this forum, and was wondering what you guys are using to get rid of the AFM? Also, how are you guys getting the ignition to work on your standalone MS setups? are you using cam angle sensors to time the spark? im totally lost, because the writeups ive seen on this forum look like the whole trigger wheel setup isn't necessary, and that was the only way ive ever seen it done(on bf cars).

    Any help at all would be greatly appreciated.
    thanks
    -ilya
    In soviet russia, car drives you!

    #2
    If you have a BPT in there, it doesn't matter what chassis it is in, it would be same as any other BPT. You could have it in a truck for what it matters and it would still be setup the same way.

    The circuit opening relay work through the Air Flow meter. It is the same on the BG engines as well. You will need to bypass that and use the MS fuel pump output to control the relay.

    Again it doesn't matter if it is BF as far as ignition. Your ignition is a BP. All you need from the chassis is a 12V and ground. I am using a Miata cam angle sensor with Toyota Coil on plugs. Most of the guys here I believe just use the BPT distributer and single coil which is pretty easy.

    If you tell us how you have the MS wired up and what you have from the BPT as far as ignition, we can show you the right direction.

    Cheers,
    Omid
    Omid
    1990 Mazda Protege GTR
    1991 Ford Escort GTR (GT2876)
    1985 Mazda RX-7 GT-1 Race Car (13B PP)

    Comment


      #3
      First off, thanks

      Now, the ms is not hooked up to the engine at this point. It is just assembled on my work desk at the moment. The car is running a lot better than when i initially made the previous post. i just did a bunch of trial and error stuff for the last 2-3 hours, and the idle has come down. i cranked the vafm wheel back a couple of notches, and then messed with the idle adjustment screw. Anyways here is the problem with my set up:

      Yes, i see where i was misleading, by "using old 323 gtx ecu harness and vafm" i meant the 88 gtx . its a b6t distributor, b6 coil, b6t ecu, and b6t injectors. oh, and b6t vafm. Now about what you said regarding the fuel pump output to bypass the vafm, would it matter which fuel pump i had, or is it just the signal from it "actuating" that im after?

      I guess what im trying to say, is i dont know where to start. the car runs, and when i get on it hard, i hear this noise that sounds like a high frequency valve tick? i was hoping using MS to alter the fuel map would solve the issue.


      Thanks so much!
      -ilya
      Last edited by ilya; 05-07-2008, 06:58 PM.
      In soviet russia, car drives you!

      Comment


        #4
        And your main problem is you are trying to run a BP with B6 stuff on it. Of course it won't work well. The injectors are smaller, the ECU is different, and the airflow meter is different, etc.

        Do you have access to all the BP stuff like the injectors, and distributer? If you do it will make it easier, but if not i think i can help you get it working anyways. Do you have a wiring diagram for the 88 GTX? if not i can look it up on Mitchell at the shop and give you a wiring diagram to use and wire up your MS.
        Last edited by bcrx7; 05-08-2008, 01:15 PM.
        Omid
        1990 Mazda Protege GTR
        1991 Ford Escort GTR (GT2876)
        1985 Mazda RX-7 GT-1 Race Car (13B PP)

        Comment


          #5
          It would be very awesome if you could help me out like that. I do not have a wiring diagram for the 88gtx, but i do have a 91 gtr diagram, which probably doesnt help. I did this swap with the help of some guys that knew what they were doing in regards to this particular swap, but they have, since then, stopped picking up their phones when i call. They said that the best way to run the ms is to run it "piggyback" but i dont know anyone that has done the swap how we did it, so i cant say whether thats true or not. Thanks for checking that info for me. If theres anything i can do to help you out, pm, and ill do it.
          thanks again
          -ilya
          In soviet russia, car drives you!

          Comment


            #6
            Alright then. I will go over the wiring diagram and point you to the right direction.
            Omid
            1990 Mazda Protege GTR
            1991 Ford Escort GTR (GT2876)
            1985 Mazda RX-7 GT-1 Race Car (13B PP)

            Comment


              #7
              That high frequency ticking you hear is probably detonation. Stop doing that. There is no reason you can't run the MS full standalone. These guys will sort you out.

              Comment


                #8
                thanks for the help guys
                -ilya

                btw, i thought the ticking was me losing oil pressure or something scary like that. lol
                In soviet russia, car drives you!

                Comment


                  #9
                  well detonation is pretty scary...
                  Posted By: Wheresthericego

                  The BP crank is made out of invincible.
                  sigpic

                  Comment


                    #10
                    detonation is scary, but predictable(easy fix if i knew something about ms). Low oil pressure, or valvetrain problems are more nightmarish... hard to pinpoint, and with my luck, would probably require pulling the motor, again. hehe.
                    -ilya
                    In soviet russia, car drives you!

                    Comment

                    Working...
                    X