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Thread: Why M90's are not a good idea.

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    BoostedK20 Sponsor Rbsjnh's Avatar
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    Why M90's are not a good idea.

    I have seen the rise in desire-ability of the m90x superchagers. Although they are able to make more boost for k series, I really feel that you will reach the limits of them far to soon for the money invested.

    I found this post on another forum, and I think it agree's with my point

    Quote Originally Posted by Joe McCarthy
    Here's a dyno chart from back in July '09 when I finally got around to putting my "K23" on the dyno. I machined 4 differently sized 8-rib pulleys, but only 3 of them are on this chart. 12 psi came from running the M90 at 58% overdrive, 14 psi at 69% overdrive, and 16.5 psi at 81% overdrive. This was done more for personal data gathering than anything else, so we didn't even rev the engine to its redline which is 9,200. Basically I wanted to see what shape the torque curve would be with the little IPS supercharger cams since they're small enough to give really sweet mileage at a cruise. Its my street car so that's important, and with the gearing I'm using I'm hoping to see somewhere close to 40 MPG at an 80 mph cruise. From other S/C dyno testing I've done bigger cams would flatten the torque curve out above 6,500
    to run the sc at 16.5 psi @81% overdrive is the same as running the m62 in the 11-12 psi range. realistically the heat from the sc will be extreme, again requiring cooling such as meth or aftercoolers.

    and realistically where will your whp be? takes alot of hp to run an m90 at 81% efficiency. so again will this sc really be worth the investment?

    opinions
    Last edited by Rbsjnh; 05-05-2012 at 01:43 PM.

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  4. #2
    I <3 Purpul Shocker
    Si Speed 317's Avatar
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    I'm new to the rotrex world, as I'm a turbo guy. But I love that more info is coming out for these and more people are running them. In for info.

    "As I lay rubber down to street, I pray for traction I can keep. But if I spin and begin to slide, please oh please protect my ride."

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    BoostedK20 Sponsor Rbsjnh's Avatar
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    An m90 is not a Rotrex its a roots style blower similar to a Jackson racing

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    I've been watching the supercharger upgrade talks on crsx and the lysholm was on my list. My buddy just did his swap and it's awesome. But now I see them messing with the whipple supercharger and it's gotten crazy!!! but in my opinion if you got the m90x to lets say 450whp and grabbed traction you would walk a 500+ turbo RSX until they finally caught up. The instant power and torque would be amazing
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    BoostedK20 Sponsor Rbsjnh's Avatar
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    I dont disagree, I think lynsholm's and whipples are way to go

    Im more surprised these havent caught on




    4 blade eaton's aka TVS superchargers.

    instant boost of a roots but buries m62 and m90's as far as efficiency goes

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    Senior Member vdubkilla's Avatar
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    Dam that looks fun Rich s/c are a blast I had a s/c gsr in an ek hatch that thing was so much fun .I cant imagine how much fun a k series hatch with one of these sittin on top of would be but I'd love to try it ! s/c sure do have the fun / holy shit factor goin for em

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    I <3 Purpul Shocker
    Si Speed 317's Avatar
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    There's no way that's gonna be a functional twin-sc setup on an Si, just a comparo shot?

    "As I lay rubber down to street, I pray for traction I can keep. But if I spin and begin to slide, please oh please protect my ride."

    One-off SRT Top Mount Manifold - GT3076R
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    I <3 Purpul Shocker
    Si Speed 317's Avatar
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    Quote Originally Posted by Rbsjnh View Post
    An m90 is not a Rotrex its a roots style blower similar to a Jackson racing
    Whoops Shows how much I know

    "As I lay rubber down to street, I pray for traction I can keep. But if I spin and begin to slide, please oh please protect my ride."

    One-off SRT Top Mount Manifold - GT3076R
    My Ruckus Build

  11. #9
    BoostedK20 Sponsor Rbsjnh's Avatar
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    Quote Originally Posted by Si Speed 317 View Post
    There's no way that's gonna be a functional twin-sc setup on an Si, just a comparo shot?
    no thats really going on there no doubt. I was set up alittle while ago to add that to my motor, but hate the design of the cte and jr manifolds/

    so I am going custom

    that is the only thing delaying using that blower on a k series

  12. #10
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    ^yeah the JR manifold is a HORRIBLE design with restrictions everywhere.... even the inlet neck is a killer... let alone the rest of the ENTIRE kit
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