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Boost cut killed the race

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    #1

    Boost cut killed the race

    It was a little below freezing and I was headed to work. An RX-8 was next to me as we left the light and we both started out kind of quiet. As we started up the hill though, he started getting on it. I tried to keep up but when it get's this cold, my Pro won't rev past 6K~. I had to wave bye bye.

    I don't know if he seemed fast because my car was sick or if he really was that fast. Burns me I can't get up in cold weather.
    1991 Protege LX with GTX swap, DD
    1990 4WD Protege with GTX swap, Project/garage decoration
    2006 Mazda 3 with 2.3, Her car
    1980 Ford F100 Short bed with 300ci 6 cylinder, work truck/home for moss
    Tags: None
    #2
    Why does cold ambient temperature air have a negative effect on your engine's performance? In my car, once the engine has reached operating temperature, the colder the OAT the better my engine performs due to the increased air density which leads to higher BHP output. For me, the difference in engine performance is quite striking between summer and winter running.

    Happy Motoring!
    02 DX Millenium Red - The Penultimate Driving Machine
    MP3 Strut Tower Bar kit; Cusco Front Lower Arm Tie Bar
    MSP Springs, Struts, Stabilizer Bars, Trailing Links, #3 Engine Mount
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    MP3 Shifter, Knob and Aluminum Pedal Set
    Suvlights HD Wiring Harness; Osram Night Breaker H4 Bulbs; Exide Edge AGM Battery
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    Modified OEM Air Intake; Racing Beat Exhaust System; Techna-Fit SS Clutch Line
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    Comment

      #3
      Originally posted by goldstar View Post
      Why does cold ambient temperature air have a negative effect on your engine's performance? In my car, once the engine has reached operating temperature, the colder the OAT the better my engine performs due to the increased air density which leads to higher BHP output. For me, the difference in engine performance is quite striking between summer and winter running.

      Happy Motoring!
      He said that he cant get it up when its cold....

      They make pills for that

      I never remember RX8s being too fast. My 2nd gen BP pro kept up with one.
      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

        #4
        My first vj11 setup with ****ty smic plumbers pluming at 8psi beat a rx8
        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

          #5
          Originally posted by goldstar View Post
          Why does cold ambient temperature air have a negative effect on your engine's performance? In my car, once the engine has reached operating temperature, the colder the OAT the better my engine performs due to the increased air density which leads to higher BHP output. For me, the difference in engine performance is quite striking between summer and winter running.

          Happy Motoring!
          Boost cut has always been a problem for this motor. If the VAF isn't positioned properly, it'll happen. 25 degree weather will cause it, or maybe the fact we were going up hill when it was so cold. IDK why it does it. Normally, I can get wheel spin in third gear. Never when it's cold though.

          I should swap out my other GTX ECU and see what happens. The other one is already installed in the project car so it's probably not going to happen but now I'm all curious.

          He said that he cant get it up when its cold....

          They make pills for that
          Lol, a pill will make my car go faster? Yea Baby! Wait, will I have to drive with an erection all the time?

          Edit-at least I think it's boost cut. I'm certainly no certified mechanic but I've been on this board long enough to know that a turbo should shine in cold weather. The increased air density messes with the computer somehow I think.
          Last edited by 1st Gen; 01-21-2011, 07:52 AM.
          1991 Protege LX with GTX swap, DD
          1990 4WD Protege with GTX swap, Project/garage decoration
          2006 Mazda 3 with 2.3, Her car
          1980 Ford F100 Short bed with 300ci 6 cylinder, work truck/home for moss

          Comment

            #6
            Sounds like its time to ditch the fail flapper and go MS
            "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

              #7
              Originally posted by MD323 View Post
              Sounds like its time to ditch the fail flapper and go MS
              quoted for truth
              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

                #8
                Originally posted by MD323 View Post
                Sounds like its time to ditch the fail flapper and go MS
                IknowIknow-------Okay--If I can generate enough money from side jobs this summer, I'll do it. I'll have to work on creating a new money stream but if I'm able, my reward will be the highest of all rewards. I will be able to beat slow sports cars on cold winter days That, and I'll be able to help support Stratified Auto which I also think is rewarding.

                Another caveat, I have to get my Project to a working plateau.
                1991 Protege LX with GTX swap, DD
                1990 4WD Protege with GTX swap, Project/garage decoration
                2006 Mazda 3 with 2.3, Her car
                1980 Ford F100 Short bed with 300ci 6 cylinder, work truck/home for moss

                Comment

                  #9
                  Originally posted by Turpro View Post
                  My first vj11 setup with ****ty smic plumbers pluming at 8psi beat a rx8

                  same thing im running now. haha and ive walked a few rx8s. they look hot though.
                  1996 Escort LX SOLD!
                  1993 Escort GT Motor Pulled then Shell Scrapped
                  1995 Escort LX BP Swap, atx=mtx swap, boosttt! Shell scrapped
                  1994 Mercury Tracer BP-T Daily Driven
                  1993 Mazda Protege LX Parts Car

                  Comment

                    #10
                    Originally posted by 1st Gen View Post
                    IknowIknow-------Okay--If I can generate enough money from side jobs this summer, I'll do it. I'll have to work on creating a new money stream but if I'm able, my reward will be the highest of all rewards. I will be able to beat slow sports cars on cold winter days That, and I'll be able to help support Stratified Auto which I also think is rewarding.

                    Another caveat, I have to get my Project to a working plateau.
                    We should have a really nice and tidy setup for you by the time you're ready to go MS. Let's just say no more boomslang harness in the very near future

                    Comment

                      #11
                      I've never ever had a problem with the flapper VAF in my turbo wagon. I LOVE the end of fall/beginning of winter, when the roads are still perfectly dry, but the air is cold. especially when it's foggy, it's like a freakin' shot of nitrous.

                      and my little toyota corolla can beat RX8's, even modified ones, and that was before I upgraded the cams.

                      --sarge

                      Comment

                        #12
                        It's a volume air flow meter. Colder air = more denser, but the car doesn't know that because there's still the same volume. More air, you run leaner/more efficient. More power, but more chance of hitting boost/fuel cut.

                        Comment

                          #13
                          I have video of my stock cayman EGT stickin to an RX8 .... lol u got more issues than boost cut.. j/p

                          94 Pro LX- 3-hole. Familia seats, Infini Corners, Familia Grille, Familia Rear Garnish w/Rear fogs EDM Glass headlights,
                          MSP Mazdaspeed Muffler,Mazdaspeed front strut bar,'00 Pro ES wheels, Neuspeed Springs,GR2s, MX3 wheel, MX3 Tall armrest

                          Comment

                            #14
                            Raced a new Jetta GLI last night. Same up hill route. The temp must have been 40 or a little below. I was positioned well for my RPM's in third gear and was ready to go when he started pulling up on me. I got on it a bit to see if he was game and he kept up, so I went all in. I wasn't watching the tach but the wall came too soon. I feathered back on the throttle but it just wouldn't give. I shifted to forth and floored it but not on that hill. He went by me so fast that I don't think he knew I was trying to race. The little K&N sticker on the side window made me laugh, just a little.

                            I read most of Ace's thread about going lean into boost and considered trying a plug in the SMIC feed duct on cold nights. It's not ideal but I'm sure it would work since it's only on cold nights that I hit boost cut. My next idea is more of a question. How much current does that VAF-fuel pump mod wire carry? I may not have used a big enough wire if it's supposed to actually power the fuel pump. I think I might try the switching the Y code VAF that's in it now with the B code that I have.

                            JDM BP 26 like it comes from the factory in a USDM 91 Protege LX.
                            1991 Protege LX with GTX swap, DD
                            1990 4WD Protege with GTX swap, Project/garage decoration
                            2006 Mazda 3 with 2.3, Her car
                            1980 Ford F100 Short bed with 300ci 6 cylinder, work truck/home for moss

                            Comment

                              #15
                              My gtx was the last turbocar I had with a flappydoor afm and it liked cold weather just fine. something else is going on. Dunno what though...
                              '90 AWD Protege, full GTR drivetrain swap, ~320 whp daily driver, RIP, and
                              '90 AWD Protege, yet another GTR swap, Open class rallycar with a Toyota GT4 gearbox swap, thus crossing the line between hobby and mental illness. And a Brabus E55 K8, removing all doubt.
                              http://www.wihandyman.com/forum/vbpi...?do=view&g=110
                              http://www.cardomain.com/ride/2599486

                              Comment

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