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Thread: MPx90 JRSC 14PSI Minnesota

  1. #1
    Newbie easymovet's Avatar
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    Minnesota Sleeper MPx90 JRSC 14PSI



    After reading about FI on my SI for years I was just gonna buy a CT-E kit and be done with it but it doesn't leave much room for upgrade compared to the MPx90. The downside is that the MPx90 doesn't have step by step instructions so I'm a bit in over my head All help appreciated!

    Goals:
    1. 0-60 in < 6 seconds
    2. > 300hp at the wheels
    4. Catch 'em off guard

    This is my build list so far: (red means already bought)
    1. MPx90 $1810
    2. MP to JRSC hardware kit $209
    3. JR Manifold Parts: 052-167, 052-157, 052-161, 052-156, 052-550, 052-553 (leaving out the $500 tentioner)

    4. Tensioner bracket and bolts, MP is gonna mod the OEM tensioner to compensate for the thickness of the bracket. $75
    5. Deatsch Injectors 800cc $365
    6. Plugs BKR9EIX Iridium IX $40
    7. Walbro 255 pump $80
    8. 3.5" pully $109

    9. Belt ???
    10. Flashpro $550
    11. CAI
    12. 4bar MAP sensor $99
    13. a few bolts $20


    --Cooling
    - Meth or aftercooler (meth is $400, aftercooler is $800)...
    - or e85 (there are ton's of stations the mid-west)

    Total ~3.8k

    -- Next stage:
    Clutch and motor mounts (i've read that you can live without both a few months

    So my questions:

    1. What belt.

    Thanks!
    Last edited by easymovet; 04-13-2012 at 07:46 PM.

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  4. #2
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    if you are running 93 octane 750cc or bigger should be fine. I don't see a header or exhaust listed I would recommend replacing both. The Merc racing bracket I don't think will work on our cars as we have EPS. You can look into it though. he responds to email pretty quick. I ordered the JRSC Tensioner from Moss minus the tensioner itself. Also you will need a clutch and as from my thread I would add engine mounts to the list. Last but not least you will need to run an aftercooler or meth injection. I wouldn't run the M90 without cooling.

    Bottom line is that you can't put a cap on your spending limit because with boost it's never ending.

  5. #3
    Newbie easymovet's Avatar
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    Thanks! I emailed Jose, he does answer fast. You are right the bracket is for rsx. I guess I'll try it out with the stock tensioner.

    I'm only going to use the biggest pulley you still think temps will be too high? I'll look for data.

  6. #4
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    Zerocool the guy who originally installed the MPx90 said they recommended cooling for all of the boost options. No testing has been done though as far as I know. Which is why I'm getting the aftercooler before I start. You could always go with a bigger injector and run E85 if you have issues with IAT and no cooling. make more power that way anyway Just sucks that only 1 person has done it and his technical information was minimal now hes MIA for months with no updates.

  7. #5
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    All the information I have read suggests the stock tensioner works with the JRSC bracket which is part 053-127. I went ahead and ordered all the bolts that come with the tensioner as well.

  8. #6
    I <3 Purpul Shocker
    Si Speed 317's Avatar
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    Awesome build! I love sleepers Did you figure out what you needed yet?

    "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

  9. #7
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    wish I was local I'd love in on a custom build
    Available now are SPAZ APPROVED decals!!! Available in multiple colors!


    Need parts?! Check out our eShop and let me know! We can help you out!
    http://boostedk20.com/eshop/

  10. #8
    Newbie easymovet's Avatar
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    This week a lot of stuff arrived:

    Injectors, Wideband O2 sensor, gaskets, 4bar MAF sensor, plugs, and walbro pump.

    I'm probably going to install those while i'm waiting for the manifold and blower to arrive so that i can play with tuning on flashpro.

    I still need to know what belt to get, anyone?

    I ordered an OEM auto tensioner off ebay to send to Magnum Powers who are going to modify it to work with the JR bracket so that i can use an Auto tensioner instead of the expensive JRSC manual one.


    Last edited by easymovet; 04-17-2012 at 11:27 PM.

  11. #9
    I <3 Purpul Shocker
    Si Speed 317's Avatar
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    That's awesome! As for a belt, I'm sure one of the SC guru's will chime in. Great idea on sending out the OEM tensioner, let us know how it goes. And be careful messing around with FlashPro, make sure you know what you're doing.

    "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

  12. #10
    Newbie easymovet's Avatar
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    Anyone have good threads for stickier street tires and dash computers.

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