Shane's URD MRKlll supercharger Build

Discussion in 'Member Builds' started by shane881510, Apr 4, 2013.

  1. shane881510

    shane881510 Member

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    I'm gonna buy a new elbow coupler 3.5" to 3". Just message me about the blower kwigs. I can make u a good deal on it.
     
  2. kwigs160966

    kwigs160966 Member

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    I'm just gonna do some digging around and see if it would a good fit for my ls swap. I'll keep you posted. I really liked it on my 1gr
     
  3. fishsticks

    fishsticks Because fast lifted truck.

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    They work. There are LS kits with the -81 available. Some folks have used twin -71s. Some use a small nitrous shot to help out low end for 1/4 mile ETs.

    Don't expect huge boost numbers, especially intercooled. But they will feed a stock internals LS motor well enough.
     
  4. shane881510

    shane881510 Member

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    U could make just as much boost or more on an ls as u could on 1gr. If the urd system used a crank mounted pulley like the trd did then u could get more boost. The Honda cars make about 18 to 20psi at redline because of such high rpms u could get the rotrex to the max impeller speed it will make boost.
     
  5. fishsticks

    fishsticks Because fast lifted truck.

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    Peak impeller speed on a C38 series is 90K RPM. Peak input shaft speed is 12K RPM. Doesn't matter how fast the motor will spin, the supercharger can only move so much air before inefficiency takes over or it comes apart.

    A 6.0 LS theoretically inhales 50% more volume than a 1GR per crank revolution. Under boost, PSI is technically a measurement of air restriction, not power or volume. CFM out of the S/C is the same at a given RPM, so PSI will be lower on a larger displacement motor with a similar VE.

    It should still make good peak power though. Shrug. I'd buy an -81 for $1500 if I thought I'd use it.
     
  6. shane881510

    shane881510 Member

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    I'd sell u an -81 for less than 1500$ if u want it. I could come down on the price.
     
  7. fishsticks

    fishsticks Because fast lifted truck.

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    I have nothing to put it on or I'd take you up on that.
     
  8. shane881510

    shane881510 Member

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    Just ordered a bottle of fluid and a filter the -92 will be on soon. Yay
     
  9. Torspd

    Torspd Moderator
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    Is the Boost going to change, or only the flow?
     
  10. shane881510

    shane881510 Member

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    I'm not sure. It said that it flows 10% more throughtout the entire range. The -92 with a 80mm pulley makes about the same power as the -81 with 70mm pulley. So the -92 with 70mm pulley I don't know what it's gonna do. I wanted more tq and little bit more hp but mostly tq around about 400+ Ft lbs.
     
  11. Torspd

    Torspd Moderator
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    How much longer until your parts arrive and you can install this blower?
     
  12. shane881510

    shane881510 Member

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    I got my oil and filter yesterday I'm gonna go ahead an install and wait on my intake elbow to fit to the blower.. Gadget told me not to use the 70mm pulley on it at first But idk. U can run a big turbo and it works pretty good. So I think I may go with the 70mm and do some testing and let Scott see some data and get me a tune for it. Like I said before I'm wanting more tq throughout the range I'm not pushing for maximum power. Just a good tune that I can drive everyday I needed and still race on the weekend. Like I do now. But more power than I have now. I just don't wanna max my fuel system out.
     
  13. Torspd

    Torspd Moderator
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    Play it safe. Donthe datalogs with the 80 first. Since that blower puts out so much more air. See where it is and once you have that green light, go from there. It will be worth the short wait for proper validation. :top:

    If you can, post up a datalog as well. It would be great to see.
     
  14. shane881510

    shane881510 Member

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    I may do that. Is 10% more air flow that much of a difference.
     
  15. shane881510

    shane881510 Member

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    I have the charger on and oil lines ran all filled up with oil. I went ahead and put the 70mm pulley on and I'm waiting on a elbow to adapt to my intake an it be ready for a new cal and be ready to drive.
     
  16. justin13703

    justin13703 Active Member

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    Man that c38-92 with a 70mm pulley is going to move an ass ton of air. Be careful. Like everyone else said I'd start with the 80mm and go from there. What's the huge rush about?
     
  17. shane881510

    shane881510 Member

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    I've run the beast a few miles now and I lowered my rev limit down to 6000 and it cut me down to 13psi of boost. But to be a bigger blower it's not that more powerful as I can tell.
     
  18. Torspd

    Torspd Moderator
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    Plan to go back to 15 psi after the datalogs are sent?
     
  19. shane881510

    shane881510 Member

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    Idk I may keep it at 6000 just to be safe. I feel better about shifting at 6000 than 6400. But I'm waiting on Scott to tell me how my data logs was and if I need a retune. As I done my data logs I watched my afr and both seemed to stay in the good all the way to redline. But I can't read them data logs to good. I was hoping for a big improvement with this -92 blower but I can't tell all the much it may just be me tho.
     
  20. Torspd

    Torspd Moderator
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    The things to look for in the datalog, to compare power from the old blower's datalogs to the new. Load, Maf g/s (grams of air per second).

    Those two are effectively torque and HP. Load = torque.
     

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