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  1. #26
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    Click here to enlarge Originally Posted by Ssphil Click here to enlarge
    I'll try to get the rpms up to 8k to get a baseline so we can really see what's happening when we swap cams, how much of an improvement they are.
    This would be very, very useful.

  2. #27
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    Click here to enlarge Originally Posted by Ssphil Click here to enlarge
    I installed custom made pistons from CP to accommodate the increased valve lift D
    Do factory pistons + high lift cams actually have clearance issues? I've been wondering this since they were released
    boop

  3. #28
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    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    Do factory pistons + high lift cams actually have clearance issues? I've been wondering this since they were released
    No

  4. #29
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    Click here to enlarge Originally Posted by Tony@VargasTurboTech Click here to enlarge
    No
    Thanks, I assumed they wouldn't

    Even with larger valves?
    boop

  5. #30
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    Click here to enlarge Originally Posted by Tony@VargasTurboTech Click here to enlarge
    No
    I thought we had a thread where someone said you have to change the pistons with certain cams?

  6. #31
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    Do factory pistons + high lift cams actually have clearance issues? I've been wondering this since they were released
    If you look on VAC Motorsports website, they state that you need to upgrade to aftermarket pistons to get proper clearance for the increased valve lift. It also says on my piston spec sheet that they are specifically built to work with Schrick high-lift cams.

  7. #32
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    Alright so I had the opportunity to get the car out on the street to perform some testing and I have to say, it's not the same car anymore! I am very pleased with how the car drives (although the clutch is very stiff and not traffic-friendly LOL)

    This is a map 1 pull and everything is up to my expectations. Can't wait to have this car dialed in!

  8. #33
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    The increased high lift of the Intake valve occurs with piston at/near BDC. No issue here.

    The increased high lift of the Exhaust valve occurs with piston at/near TDC. This could be a problem with valve to piston clearance.
    MILVS- +1mm Increase Intake Valve Lift for N52, N55, S55, N20 Engines
    http://www.bimmerboost.com/showthrea...ift-more-power
    www.bimmerMILVS.com
    Coming soon: +1mm lift Exhaust cam for N52 and N55
    and soon- B58 MILVS with +1mm increase intake valve lift

  9. #34
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    Click here to enlarge Originally Posted by Ssphil Click here to enlarge
    If you look on VAC Motorsports website, they state that you need to upgrade to aftermarket pistons to get proper clearance for the increased valve lift. It also says on my piston spec sheet that they are specifically built to work with Schrick high-lift cams.
    This is what I was referencing, good post.

  10. #35
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    Click here to enlarge Originally Posted by Ssphil Click here to enlarge
    This is a map 1 pull and everything is up to my expectations. Can't wait to have this car dialed in!
    What are the specs?

  11. #36
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    What are the specs?
    Which specs are you refering to?

  12. #37
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    Small update, I got in touch with a shop that owns a Dynojet dyno here in Quebec so I will be able to get my car there but it's not going to be until May. During that time, I'll be spending some time (and money) looking for upgraded axles to be ready for our first drag event in June. That new twin disc clutch and the MHD shift bog will destroy the OEM units in no time lol

  13. #38
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    Hey everyone, I just got back from the dyno and I am pretty happy with the results for now. I got 598whp from 91octane and meth, then I poured some MS109 race gas and turned up the boost and gave a few degrees of ignition advance and got 712whp from DI and meth. It is worth noting that I don't have port injection or any form of shotgun HPFP upgrade as of now, and it will probably be on the list for the next upgrade as my FPH was dropping and the trims and AFRs were rising.

    I am equally impressed how the power seems to hold above 7k and not drop like some other dyno sheets I've seen. I believe valve springs might have something to do there but this only makes me excited to see what this engine will be able to do with high lift cams.

    I have linked the dyno sheet and a video of my car in action.

    Click here to enlarge


  14. #39
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    Nice.

    So this is with stock head, stock valves, stock cams and upgraded valve springs.

    What was the boost on 91 octane/598whp and 'more boost' on 109 octane/712whp?
    MILVS- +1mm Increase Intake Valve Lift for N52, N55, S55, N20 Engines
    http://www.bimmerboost.com/showthrea...ift-more-power
    www.bimmerMILVS.com
    Coming soon: +1mm lift Exhaust cam for N52 and N55
    and soon- B58 MILVS with +1mm increase intake valve lift

  15. #40
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    Yes this is all stock except for the Supertech valve springs. As for the boost, the first pass was done on 24 psi and the second one was 32 but I had to lower it in the midrange because it would build boost so quickly the AFR would jump to 20 for half a second and then catch up, that’s why the torque seems low, I was able to get it close to 700wtq with a flat boost curve but I’d rather keep it safe.

  16. #41
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    Click here to enlarge Originally Posted by Ssphil Click here to enlarge
    Yes this is all stock except for the Supertech valve springs. As for the boost, the first pass was done on 24 psi and the second one was 32 but I had to lower it in the midrange because it would build boost so quickly the AFR would jump to 20 for half a second and then catch up, that’s why the torque seems low, I was able to get it close to 700wtq with a flat boost curve but I’d rather keep it safe.
    When do you have your starting point for spraying meth?
    Burger Motorsports
    Home of the Worlds fastest N20s, N54s, N55s, S55s, N63s, and S63s!

    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.

  17. #42
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    14 psi IIRC

  18. #43
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    Click here to enlarge Originally Posted by Tony@VargasTurboTech Click here to enlarge
    Ported head makes a huge difference
    Attachment 58386

    Invalid Attachment specified.

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