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Project: PBR-Built Z/28

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  • Joel - is the clutch fully disengaging? WOT with clutch in does the car creep?

    It could be the syncros - but if it's getting worse after the clutch - I'd be looking at the hydraulics and or the stack height of the unit.

    Did you measure the stack height and shim?
    2000 Formula
    fixed slow junk

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    • The clutch doesnt drag. Tested it on jack stands. Honestly it works great i think its just a heavy clutch disc
      -Joel
      1995 Z28 M6 - AI226/234 - autocross ricer
      1984 Scottsdale K10 - 305/4bbl/4spd


      WTB List:Midwest Chasis DS Loop

      Comment


      • Forgot the LT1 style is different.

        And adjustable master might give it that extra umph to allow you to shift at WOT.
        2000 Formula
        fixed slow junk

        Comment


        • Does your slave cylinder rod still have the clear-ish plastic cap on the end where it goes into the fork?

          Comment


          • You mean like one that comes on a remanufactured unit?

            I think the clutch hydraulics are fine. Engagement has always been precise.
            -Joel
            1995 Z28 M6 - AI226/234 - autocross ricer
            1984 Scottsdale K10 - 305/4bbl/4spd


            WTB List:Midwest Chasis DS Loop

            Comment


            • Yeah. Mine needed that last little bit of "oomph" because it was having the same issue of difficult shifting at WOT on occasion. It was suggested to me to make my stock master adjustable, but after some reading I read that the system is designed to have that plastic cup on there. Put it in and my shifting problems were gone. That miniscule amount of extra travel was just enough to make a difference.

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              • The thing is i can normally shift pressing the pedal maybe a third of the way. I was deliberately stabbing it to the floor and still having some trouble with it. Just wish it shifted like it used to with my old spec, instantly and effortlessly.
                -Joel
                1995 Z28 M6 - AI226/234 - autocross ricer
                1984 Scottsdale K10 - 305/4bbl/4spd


                WTB List:Midwest Chasis DS Loop

                Comment


                • Fluid? The BMW has been having problems with the Redline junk so I'll be switching it up soon.
                  1994 Z28 - 2002 M3 - 2015 1.0T Mileage Accumulator

                  sigpic

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                  • Originally posted by JoeliusZ28 View Post
                    The thing is i can normally shift pressing the pedal maybe a third of the way. I was deliberately stabbing it to the floor and still having some trouble with it. Just wish it shifted like it used to with my old spec, instantly and effortlessly.
                    That sounds exactly like hydraulics. At WOT when you smack the clutch is when it's going to have the hardest time overcoming the pressure plate do to centrifugal force.
                    2000 Formula
                    fixed slow junk

                    Comment


                    • Thats true but I still dont think its hydraulics because it can be at a standstill at idle where i just go 1-2-1-2-1-2 and never release te clutch pedal at all and it will still be notchy. Also 2nd gear is the only one blocking me out so far.
                      -Joel
                      1995 Z28 M6 - AI226/234 - autocross ricer
                      1984 Scottsdale K10 - 305/4bbl/4spd


                      WTB List:Midwest Chasis DS Loop

                      Comment


                      • Add some PBR to the clutch fluid reservoir
                        2000 Trans Am l 1967 Firebird

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                        • Oddly enough its driving fine now. This car just like giving me fits ...
                          -Joel
                          1995 Z28 M6 - AI226/234 - autocross ricer
                          1984 Scottsdale K10 - 305/4bbl/4spd


                          WTB List:Midwest Chasis DS Loop

                          Comment


                          • Figured id post an update.

                            Rear Axle: plan is to go with a Dana 60 for sure, but i am going to get at least one more season out of the 10 bolt provided it doesn't break.

                            Clutch: i plan on changing the clutch when do the rear axle. The competition clutch is an excellent clutch but i cant get it out of my head how much i enjoyed the fast shifts of my old spec 6-puck.

                            Tune: i recently picked up a dell netbook and once i get it set up i am going to start tweaking my tune. there are a couple things i want to change related to vacuum. Currently the car has a vacuum leak that i am unable to fix without adjusting the tune because the car will idle too low and stall, and it will also cause a rich condition (it already idles rich). I wasnt aware of the vacuum leak when i first tuned the car, but i now realize this is why my idle was so easy to to tune. I also want to make some changes to the operation of the IAC valve. The factory configuration opens the IAC valve when the car is moving anything above something like 3mph, making it idle around 1100. This is for drivability to allow smooth/casual shifts. I want to get rid of this for a few reasons: One, it will be more optimal for fast shifts since rpms will decrease faster. Two, it will engine brake harder which is useful (like an ebrake) for setting the car up into a corner. If i dont want the strong engine braking i can use the clutch or heel-toe the gas. And finally the third reason is because a full vacuum engine-brake sounds totally bad ass through duals. Right now my car only does it when the engine is cold. it will also be nice to have engine that idles without bringing the car to a stop. More choppity chop with the cam

                            Step one will be a clean format and reinstall of windows on the laptop. I'm also going to install a vacuum gauge when i fix the leak (connect it directly to the open vacuum port)

                            Lastly, my brake light is on the dash full time (ebrake light). Need to get that fixed ... Seems like i just finished fixing 3 other idiot lights on the dash
                            Last edited by JoeliusZ28; May 8th, 2015, 09:08 AM.
                            -Joel
                            1995 Z28 M6 - AI226/234 - autocross ricer
                            1984 Scottsdale K10 - 305/4bbl/4spd


                            WTB List:Midwest Chasis DS Loop

                            Comment


                            • I absolutely love how fast the revs fall with the BMW. Makes it waaaay easier to drive at an autocross as you can just lift a bit instead of dancing with the brake pedal, even for fairly large adjustments in speed.
                              1994 Z28 - 2002 M3 - 2015 1.0T Mileage Accumulator

                              sigpic

                              Comment


                              • Yep exactly the idea. My thinking here more or less spawned from driving my dads nova, which doesnt have an IAC to meddle with things. Letting off the gas with a carb = full vacuum and its a blast to drive that way.
                                -Joel
                                1995 Z28 M6 - AI226/234 - autocross ricer
                                1984 Scottsdale K10 - 305/4bbl/4spd


                                WTB List:Midwest Chasis DS Loop

                                Comment

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