Announcement

Collapse
No announcement yet.

Spectacular

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

    Spectacular

    This is just a little bit of a rant but I feel it's well deserved.

    I've always had some issues with the very fine tuning points of the MS on my car. Mostly related to idle. At idle, the car sometimes misfired or pop causing an unpleasant feeling sitting at a light. For a long time, my solution was to run rich at idle (13 or so AFR) and I knew I could do better.

    After countless hours, and I mean literally hundreds of hours, of playing with the settings and trying and datalogging different things including getting matched RC injectors, buffering the MAP line, etc, etc, etc ... well tonight I have finally fine tuned the car to how I want it to run. Closed loop idle works like a charm and my AFRs are stoich and more solid than they were on the stock ECU. You could sit in the car, turn the key, and have absolutely no clue it was not stock. I am very picky about how smoothly a car runs at idle and it just wasn't meeting my standards before.

    I would go as far as saying these inconsistent idle issues had driven me so nuts that I disliked driving the car and almost said f-it on more than one occasion.

    Now I just can't wait for spring to come to drive it. Much more excited about this than the MS3 and that's saying A LOT.

    /rant

    #2
    good to here you never gave up lex!

    you are the true tuner of our community, not many would have gone the lengths you have to create the system and motr you have, and post the details.
    "Discontent is the first necessity of progress."
    -Thomas A. Edison

    "There is a fine line between ballin' on a budget, and dreamin' on an empty wallet."


    *Junked* 92 mx3, BP swap- milage whore, beaten up and down the east coast
    *Junked* KLZE powered 323 on Megasquirt 1
    172.60HP & 156.93 TQ with only headers and short ram intake. back under the knife for a BPT swap.
    New Daily stock 1.6L 1999 Mazda Protege LX

    Comment


      #3
      i know how it feels to have a bad idle my car sometimes never idles underl 1000

      Comment


        #4
        Interesting... do you think this would help out my miss at 3000rpm?

        JoN - Automotive Machinist Journeyman/Refrigeration Mechanic Journeyman
        Member of MX-3.com
        1996 Mazda MX-3 RS - Creek Blue Mica
        1993 Mazda MX-3 GS SE - Raspberry... RIP


        Racing BP (Project "Blue" Marlin)... Twin Scroll GT3071R, breaking 30psi at the moment!

        "Do it ONCE, do it RIGHT!"

        Comment


          #5
          Haha, you would hate my Miata.

          Thanks to the cams it shakes like an old dryer at stoplights.

          Edit: pics are on the way- I didn't forget :D
          sigpic

          03 Accord DX: K24/5MT, peasant-spec old man's car
          92 240SX: KA/T25, nerd mobile

          Comment


            #6
            Good to hear she's idleing right. That's my pet pev as well. Before I swapped the intake manifold I couldn't get my idle steady and consistant. Now she idles perfect at 800prm.
            1993 Protege LX-Midnight's shadow SOLD
            1996 Honda CBR600-Wrecked. Damn Honda crippled me
            2002 mazda MPV-family truckster SOLD
            2010 VW routon

            Originally posted by jay
            .....they totally underestimated the number of gearheads such as myself that have families but refuse to grow the hell up and stop playing with cars, or that otherwise see the utility of having 4 doors. Obviously I ain't alone, as there are a helluva lotta sti and evo here. Bueler? Beuler? Mazda? Mazda?

            Comment


              #7
              poor idle doesnt really bother me, although i'd love to improve it at least a little... mine idles at like 1000-2000 depending on what mood its in... LOL

              congrats!
              Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
              ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
              Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

              Comment


                #8
                I have a pretty bad misfire at idle and throttle tip-in as well. I would like to know a few more details about how you solved the issue. The idle doesn't really bother me, but the stumble at very small TPS values is a pain when racing. I've got my injectors off at Witchhunter Performance being cleaned and tested right now. I figured that was the best place to start.

                Comment


                  #9
                  I have a brutal tip in problem ,i have spent hours trying to sort it out.
                  What was your fix ?
                  Last edited by Beerizfood; 01-15-2009, 06:25 AM. Reason: spelling error
                  Powered by ACME

                  Comment


                    #10
                    I too suffer from tip in. I figured it was the 700 pound bp flywheel.
                    I live my life a quarter pounder at a time. And for those 500 calories or more, I'm free. I need FRIES! Two of them. The big ones. Oh, and I need them tonight. You're lucky the double shot of BBQ sauce didn't blow the seam on your nugget box. There she is, 2 pounds of pure beef. My dad ate it in 9.0 seconds flat. Check it out, it's like this. If I lose, winner takes my happy meal. But if I win, I take the burger and the toy. To some people, that's more important.

                    ._________________________
                    |.....Overnight....................| ||
                    |.....Japan Parts.................| |'|";,___.
                    |_..._...____________======||_|_|...,]
                    "(@)'(@)""'''''''''''''"'''"**|(@)(@)*****"(@)
                    Oh and by the way that shot in your banner with Vin Diesel's car getting shot, thats a civic not an altezza.

                    Comment


                      #11
                      tip in issues = crappy accelleration enrichment settings
                      Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
                      ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
                      Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

                      Comment


                        #12
                        Originally posted by therieldeal View Post
                        tip in issues = crappy accelleration enrichment settings
                        Jon is correct, the accel settings are incorrect. Under File-> Acceleration Wizard you can tune the amount of fuel added when there is a particular rate of change in the TPS of MAP sensor. You can also specify for how long the fuel should be added and if there should be a decay rate over that period.

                        Have any of you tried tuning those settings? You can even do it free revving the car and just stabbing the gas at different rates. Usually a bog is characterized by running too rich (too much fuel is added during accel). You can use either the TPS (if you have a 4 wire one) or the MAP sensor to calculate this and in MSI you have to choose one or the other while in MSII you can actually have a percentage of each used.

                        Another less known fact is that boggy accel can also be cured by upping the timing advance.

                        Another not so known fact is that a smooth MAP sensor does wonders for a smooth A/F ratio and operation. I have added a small plastic canister (a fuel filter from a lawn mower) inline with my map sensor on the vacuum hose. This has greatly smoothed out the MAP sensor which has made tuning a lot easier, smoother, and more consistent.

                        Interesting... do you think this would help out my miss at 3000rpm?
                        Jon, we can do more troubleshooting and work on that for sure when you take the beast out of hibernation.

                        Comment


                          #13
                          It's good to see how well sorted out your megasquirt is and how persistant and unrelenting you are to come up with as close to perfect a solution you can get. Instead of simply good enough.

                          I'll be knocking on your door ready to buy one of these come Feb or March at the latest.

                          Comment


                            #14
                            Awesome. I have played with the Accel Enrichment a little, but it probably does need a lot more work. The only real "tuning" I did was on the dyno and after getting the A/Fs-timing in the ballpark we got stuck trying to fix a stumble on a very specific section of the table. I'm hoping the clean injectors will solve that issue as we couldn't tune it out.

                            Comment


                              #15
                              In terms of idle, I'd also like to make another point. Keeping the PW as consistent as possible makes for a stable idle. So if you are running closed loop using the O2 sensor, increase the number of ignition pulses over which a change is made to somewhere in the 60-80 pulses range. The slower reaction to the O2 sensor results in a smoother idle - especially when running large injectors and the idle PW is small as it is.

                              Comment

                              Working...
                              X