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  1. #51
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    Interesting find.

    Subbed.

  2. #52
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    Click here to enlarge Originally Posted by CobraMarty Click here to enlarge
    The N52 that was experiencing valve float was BPC's race car. It was a N52 with 16 psi boost. These engines were not designed for boost let alone that much. If they ran less than 10psi, they would probably be fine.

    N/A N52 has no valve float issues to near 8000rpm

    The N55 is designed and spec'ed for boost and currently run over 20+psi with no valve float. I am sure there will be no valve float at stock or even +10psi. Beyond that uncharted territory.

    Realize that 'boost' is really a measure of air that is 'backed up' in the intake manifold and can't get into the cylinder and combustion chamber. More 'boost' is hotter air which has lower air density. You don't really want more boost, you want more air and air density into the cylinder and combustion chamber.

    Adding MILVs to a N55 will lower boost 1-2psi but you will make more power with less boost. This is due to more air going into the cylinder and the lower boost air will be cooler and will have more air density going into the cylinder. More air and more air density is more power at lower boost.

  3. #53
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    Very exciting...

  4. #54
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    Here is a recent install on a N/A N52 auto with EURO intake, 3 stage intake, BMW PE and BPC tune.
    Before and after MILVs install-
    Click here to enlarge


    Here is a stock N52 auto and above modified N52 with MILVs-
    Not turbo numbers but still respectable for N/A and streetable-
    Click here to enlarge
    Attached Images Attached Images  
    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 N52 and N55

  5. #55
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    So these have yet to be installed on a N55? Do they require DME retuning - if not I have a PS2 + meth car I'd be willing to test them on. Please email me with price + shipping to China, Xiamen. harkes@gmail.com

  6. #56
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    Just thoughts but, do you have a gofundme or PayPal or some donation link where us n55/s55 guys could maybe pitch in a few bucks towards you getting an N55 motor or maybe even an S55 for testing this stuff on? I think junk yard motors aren't too expensive.

  7. #57
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    Sets are at a well known tuner with a N55 and another set at a another known tuner with a S55. Just waiting for them to install, tune and dyno.

    Or somebody just step up, someone has to be first. I'll make you a deal if you post before and after dyno sheets.

    They have been proven on the N52 engine and a N52 with a turbocharger making 500HP.
    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 N52 and N55

  8. #58
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    BPC installs a set of MILVs on their S55. What's next? N55 and N20?

    HERE-
    https://www.bimmerboost.com/showthre...o-we-have-here
    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 N52 and N55

  9. #59
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    These are modified new OEM parts.

    They increase the lift from 80% - 100% eccentric cam position. That corresponds to about the same throttle position, 80%-100% WOT.

    No change in lift below 80% ECC position. Start, idle, cruise, mild acceleration is the same as stock.
    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 N52 and N55

  10. #60
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    I have a client with an N55 who may be interested in these. Not stock engine management though, so would be far easier to tune. What's the price?

  11. #61
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    PM sent. Thanks for your interest.
    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 N52 and N55

  12. #62
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    Click here to enlarge Originally Posted by CobraMarty Click here to enlarge
    PM sent. Thanks for your interest.
    Received, very reasonable.

    So, along with it goes a can of worms question. There isn't a question I can't answer for myself on mss6x DMEs or look up in disassembly. Zero experience on MSD8x. Is there a reasonable DAMOS, map pack or XDF that shows valvetronic data? I'm going to assume that all travel limits, lift tables, and fault recognition is handled in the calibration area and I have enough IDA work already to last me 5 more years.

    Getting the N55 to run on a MoTeC M142 and retaining valvetronic will be challenging enough as I have to build a BLDC motor controller that runs on a 5 hall sensor feedback as well as writing the code in M1 Build to run it. Having some baseline map for valve lift would be nice and remove some guess work for the initial run calibration.

  13. #63
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    This is from the N52 but as the parts are the same for the N55, I'm sure it applies to the N55 as well.
    This is stock valve lift vs. eccentric cam position

    Click here to enlarge


    Click here to enlarge
    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 N52 and N55

  14. #64
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    This is what the MILVs do- as measured on my N52 engine on the stand.
    Valve lift numbers are different due to the lifters not being 'pumped up'.
    It is the additional lift after about 80% eccentric cam position that is important.

    Click here to enlarge
    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 N52 and N55

  15. #65
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    @TwistedTuning Is the above table available for N55s? I only see Intake Valve Lift (moving-warm) that plots pedal vs RPM and you plug in valve lift. It won't let me go above 10.000mm, so can't change it to 10.9mm to utilize the milvs.

  16. #66
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    Click here to enlarge Originally Posted by Weehe Click here to enlarge
    @TwistedTuning Is the above table available for N55s? I only see Intake Valve Lift (moving-warm) that plots pedal vs RPM and you plug in valve lift. It won't let me go above 10.000mm, so can't change it to 10.9mm to utilize the milvs.
    Intake Valve Lift (moving-warm) is available in BM3 and it let me change from 9.8mm to 10.8mm.

  17. #67
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by M_terkait Click here to enlarge
    Intake Valve Lift (moving-warm) is available in BM3 and it let me change from 9.8mm to 10.8mm.
    Interesting. I've got MHD and the XDF only had that table and it won't let me go above 10mm.

  18. #68
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    It's my first time using tuner pro, so didn't know you can change the max value allowed on the table. Right click on the table, edit XDF and increase max value from 10 to 11. Still looking into it, but think I found the N55 equivalent of the table Marty showed above.

  19. #69
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    So here's a question on adjusting the lift parameters.

    The Valvetronic motor is a brushless motor driving a worm gear. Valvetronic 3 uses a 5-hall sensor BLDC. 3 Halls are used for normal control and the additional two for fine position sensing and allow it to control rotor position to under 7.5 degrees rotation. Also knowing the worm gear ratio, this allows it to know the position of the eccentric shaft and therefore the lift.

    Note that there's nothing that give direct position feedback of the valves themselves in mm lift.

    This means that somewhere is a function that rotates the eccentric shaft lock to lock. This would then set the end points to values stored most likely in the calibration and then all movements in between are interpolated by degrees rotation of the valvetronic motor from then on.

    If the end point lift values are not changed to match the new actual values with these installed, how does the DME correctly know the actual lift value during rotation? And by just modifying the table that controls lift, is it doing what we think it's doing?

    My guess is, that table is just looking backward to find a percentage travel of the valvetronic motor (percentage of total hall pulse counts from lock to lock).

    Does anyone have better detail on how that table actually works?

  20. #70
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    Click here to enlarge Originally Posted by jcolley Click here to enlarge
    So here's a question on adjusting the lift parameters.

    The Valvetronic motor is a brushless motor driving a worm gear. Valvetronic 3 uses a 5-hall sensor BLDC. 3 Halls are used for normal control and the additional two for fine position sensing and allow it to control rotor position to under 7.5 degrees rotation. Also knowing the worm gear ratio, this allows it to know the position of the eccentric shaft and therefore the lift.

    Note that there's nothing that give direct position feedback of the valves themselves in mm lift.

    This means that somewhere is a function that rotates the eccentric shaft lock to lock. This would then set the end points to values stored most likely in the calibration and then all movements in between are interpolated by degrees rotation of the valvetronic motor from then on.

    If the end point lift values are not changed to match the new actual values with these installed, how does the DME correctly know the actual lift value during rotation? And by just modifying the table that controls lift, is it doing what we think it's doing?

    My guess is, that table is just looking backward to find a percentage travel of the valvetronic motor (percentage of total hall pulse counts from lock to lock).

    Does anyone have better detail on how that table actually works?
    Im not sure but, the table that I have in BM3 is Travel% VS RPM. I increased the last two rows by 1. which both represents < 80% travel.

    Click here to enlarge

  21. #71
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    Subscribed

  22. #72
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    That's a cool table. Good find.
    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 N52 and N55

  23. #73
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    That is the same table available for MHD. However, I'm not convinced that is the only table available and that more tuning changes are needed.

  24. #74
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    2 out of 2 members liked this post. Yes Reputation No
    Hey CobraMarty, I am new to the forum so not allowed to send a PM yet.
    My name is Brendan, I am part of the ProTUning Freaks / Bootmod3 dev team in canada.
    Would love to know the cost and time to ship 2x sets??
    I have a 2015 M235i full bolt on w/ meth

    Perhaps you can PM me to discuss further?

    thanks in advance!

  25. #75
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    New parts are $350 shipped US, +$20 to canada. 2 sets can be sent in 1 box to Canada.

    I'll send you a PM.
    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 N52 and N55

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