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Thread: Sunbelt Stage 3 cams setup question

  1. #1
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    Sunbelt Stage 3 cams setup question

    Hey guys and gals, got a set of Sunbelts Stage 3 cams for my 325is, 2.5l, 11.5:1 CP pistons, moneyshift valve cutouts from VAC, Pauter rods, crank worked, ATI damper, S54 oil system, megasquirt, M50 manifold, etc. Looking for some setup info. I have heard 3 degrees retarded on the intake cam, small vanos shim from Bimmerworld etc. Haven't found adjustable timing gears. Anybody run this setup? Have any knowledge? ZF trans. Running in SCCA STU, currently have a built 3.91, probably switching to the 3.64.
    Chris Leone
    chrisleonemotorsports.com
    roll cages, repairs and racecar fabrication
    1984 318i now 325is
    1994 325is STU racecar
    1988 325is donor

  2. #2
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    Search, there are a couple good threads on Sunbelt setup. Helped me, but itís been so long I donít recall the details. One of the cams straight up, one retarded, vanos limiter, degree wheel and dial indicator, something... you donít need adjustable gears, all can be done in vanos setup.
    Social media weaponizes blandness - Sebastian Junger

  3. #3
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    Quote Originally Posted by XXLBIMMER View Post
    Hey guys and gals, got a set of Sunbelts Stage 3 cams for my 325is, 2.5l, 11.5:1 CP pistons, moneyshift valve cutouts from VAC, Pauter rods, crank worked, ATI damper, S54 oil system, megasquirt, M50 manifold, etc. Looking for some setup info. I have heard 3 degrees retarded on the intake cam, small vanos shim from Bimmerworld etc. Haven't found adjustable timing gears. Anybody run this setup? Have any knowledge? ZF trans. Running in SCCA STU, currently have a built 3.91, probably switching to the 3.64.
    Very interested is following your progress and hearing how this engine works for you. I plan on building a 2.5L for STU.


    Sent from my iPhone using Tapatalk

  4. #4
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    If you have moneyshift valve pockets in your pistons, why do you need a Vanos shim?

  5. #5
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    Quote Originally Posted by jakermac View Post
    If you have moneyshift valve pockets in your pistons, why do you need a Vanos shim?
    Pistons came first.
    I've searched for quite a while. Found some info on stage 2s, but not on the 3s.
    Chris Leone
    chrisleonemotorsports.com
    roll cages, repairs and racecar fabrication
    1984 318i now 325is
    1994 325is STU racecar
    1988 325is donor

  6. #6
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    Are those sunbelts legal? "cams must have stock lift"???
    99 M3 STU/ GTS3 Project

  7. #7
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    Quote Originally Posted by NotoriousJJE View Post
    Are those sunbelts legal? "cams must have stock lift"???
    If you are using an S52 , no they are not legal. I'm using an M52 2.5l.
    9.1.4.1.6. Valve lift is limited to .600 inches
    Per spec line of M3 "Engines must use the OEM camshaft lift."
    Chris Leone
    chrisleonemotorsports.com
    roll cages, repairs and racecar fabrication
    1984 318i now 325is
    1994 325is STU racecar
    1988 325is donor

  8. #8
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    Nice! I'm jealous! Are you going to have it ready for the May race at daytona? I hope to be there and shake it down with amasa a couple of weeks before.
    99 M3 STU/ GTS3 Project

  9. #9
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    Quote Originally Posted by NotoriousJJE View Post
    Nice! I'm jealous! Are you going to have it ready for the May race at daytona? I hope to be there and shake it down with amasa a couple of weeks before.
    Not the way things are going at the shop. I barely get anytime to work on it. It's always everybody else's crap first. Should have my last project done in about 2 weeks. Then I can work on my stuff. Until something else pops up.
    Chris Leone
    chrisleonemotorsports.com
    roll cages, repairs and racecar fabrication
    1984 318i now 325is
    1994 325is STU racecar
    1988 325is donor

  10. #10
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    It would be nice if someone would degree these cams and post up the numbers at 0.005Ē and 0.050Ē for the rest of us. Iíve done so for the S52, Elgin regrinds and the Schrick 264/256 cams already.

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