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Thread: Z3M Finned Differential Cover on S52 Swapped E30, is it worth it?

  1. #1
    Join Date
    May 2007
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    NC
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    2002 BMW M3

    Z3M Finned Differential Cover on S52 Swapped E30, is it worth it?

    Finished my project of swapping an S52 into an E30. Enjoying the car but I made a mistake. When I had the differential built, I went with 25% lockup, it is not working for me. I am now in the process of upgrading to a 40% lockup and the guy doing the work is recommending a Z3M cover. My car is just a weekend car that I enjoy on local twisty roads and sometimes autocross, will the Z3M cover really help me?


    Suspension: AST 4100 GTS, Vorshlag camber plates, Turner limiters
    Brakes: ZCP front and rear drilled rotors, Turner stainless steel brake lines, ATE Super Blue brake fluid
    Other: Reinforced rear subframe, All new RTAB, RSM, FCAB, Dunlop Star Spec tires 245/40/18 275/35/18

  2. #2
    Join Date
    Feb 2007
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    '95m3(Avus)/996tt/4.8is
    Quote Originally Posted by paulkots View Post
    Finished my project of swapping an S52 into an E30. Enjoying the car but I made a mistake. When I had the differential built, I went with 25% lockup, it is not working for me. I am now in the process of upgrading to a 40% lockup and the guy doing the work is recommending a Z3M cover. My car is just a weekend car that I enjoy on local twisty roads and sometimes autocross, will the Z3M cover really help me?

    YouTube Link: http://www.youtube.com/watch?v=sVUUrBz8D6M
    No way. To much money of you are not racing/ lapping the car IMO.

  3. #3
    Join Date
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    Charlotte
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    2012 GTI
    Quote Originally Posted by olemiss540 View Post
    No way. To much money of you are not racing/ lapping the car IMO.
    +1
    97 M3 - SCCA TT Prepped
    17 F150 - Tow Pig
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  4. #4
    Join Date
    Mar 2003
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    somers,ny
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    I ran one on my swapped e30/s50....it was street legal track only car. For your needs I would DOUBT its needed


    who even knows how useful it really is w/o temps pre and post install.

    bought my cover off a trashed mz3...50 bux.......and it looks super trick...lol

    but geez your rear grip looks bad. I ran a stock oe lsd 373 and never broke loose like that on tracks...or your tires suck
    Last edited by jrkoupe; 08-28-2017 at 03:51 PM.

  5. #5
    Join Date
    May 2007
    Location
    NC
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    134
    My Cars
    2002 BMW M3
    I am running 225/45/15 Hankook RS-4 tires with perfect 50/50 cross weight(corner balanced) and Ground Control coilover suspension with 2.5 degrees negative camber front and zero toe. 2.0 degrees negative in rear and 1/8" toe in. The only information that I couldn't find is that rake that I should be running. All new suspension bushings and everything.

    Really hoping to figure out the traction issue. Hoping going from 25% lockup to 40% lockup will help. Any ideas at what else I should be looking at?

    Edit: I could be making a mistake on the tires. I am used to my E46 M3 with which I run 38 hot tire temps, I have been running 36 hot on E30. Going to try bring it down to 34 hot.
    Last edited by paulkots; 09-12-2017 at 10:14 AM.

    Suspension: AST 4100 GTS, Vorshlag camber plates, Turner limiters
    Brakes: ZCP front and rear drilled rotors, Turner stainless steel brake lines, ATE Super Blue brake fluid
    Other: Reinforced rear subframe, All new RTAB, RSM, FCAB, Dunlop Star Spec tires 245/40/18 275/35/18

  6. #6
    Join Date
    Mar 2003
    Location
    somers,ny
    Posts
    4,040
    hey.....


    just ran across this thread again

    I ran ra1 for yrs......always 40 hot.

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