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Thread: who is using the 10.5" Lower pulley?

  1. #1
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    who is using the 10.5" Lower pulley?

    How does it fit? how much boost you getting?


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  3. #2
    killer67 is offline Cadillac Owners Fanatic
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    Re: who is using the 10.5" Lower pulley?

    10.5" Never head of it

  4. #3
    killer67 is offline Cadillac Owners Fanatic
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    Re: who is using the 10.5" Lower pulley?

    10.5"? Never head of it - there is a 10" that could give you a range of boost options depending on your upper pulley size. What are you doing up top?

  5. #4
    atcbrownie is offline Cadillac Owners Member
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    Re: who is using the 10.5" Lower pulley?

    metco offers it as part of the combo with their innovators west balancer. says its 6.5 lbs of boost.

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    Re: who is using the 10.5" Lower pulley?

    Quote Originally Posted by killer67 View Post
    10.5"? Never head of it - there is a 10" that could give you a range of boost options depending on your upper pulley size. What are you doing up top?
    Metco has a 10.5" pulley on there sight that is suppose to add 6.5psi of boost. I'm wanting to leave the stock upper pulley

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    qictrk is offline Cadillac Owners Enthusiast
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    Re: who is using the 10.5" Lower pulley?

    I used a 10 with my '09 at one time. I no longer have the car, but I had a time making room for the 10. 10.5.......ouch. Its going to be real tight with the different lines. I also used a 9.5
    with that car and found it much better as far as tuning and better control of the throttle. My advice, stay with a 9.5. Make other changes if you want more power. Cecil...........

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    wait4me is offline Cadillac Owners Connoisseur
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    Re: who is using the 10.5" Lower pulley?

    i dont think a 10.5 would fit, it would hit the waterpump pulley. a 10 is pretty close to it.

  9. #8
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    Re: who is using the 10.5" Lower pulley?

    Well I ordered it, Metco told me it fits no problem and "there are plenty of people running them". So I will let you all know when it get's here if it fits.

  10. #9
    Salsbury1 is offline Cadillac Owners Member
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    Re: who is using the 10.5" Lower pulley?

    Any more news on this?

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    WrapFactory is offline Cadillac Owners Member
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    Re: who is using the 10.5" Lower pulley?

    I have the 10.5" on my car with the metco relocation kit (relocates idlers, etc). I've had it on for 7k miles or so now and seems great. Make 14-14.5psi, My upper pulley in stock. I can take some pics if you guys would like?

    Thanks
    James

  12. #11
    basa is offline Cadillac Owners Member
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    Re: who is using the 10.5" Lower pulley?

    I'm doing my 10.5 pulley and custom cam this Sunday. The only think that will have to be moved for it is the ac line.

  13. #12
    Luna. is offline Cadillac Owners Connoisseur
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    Re: who is using the 10.5" Lower pulley?

    What are the IAT2s with this? I'd also love to see a dyno run to see the torque curve, for my bet is that rwtq falls off a cliff at higher RPMs.

  14. #13
    Doc GTO is offline Cadillac Owners Member
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    Re: who is using the 10.5" Lower pulley?

    Another member of the CTSV forum has it on his M6 car and makes 16psi with it. With my 2.38 upper I'm at 14psi as a comparison. He made 576 and I made 563rwhp. Same tuner and both DynoJets.

  15. #14
    ClarkkentCTSV is offline Cadillac Owners Fanatic
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    Re: who is using the 10.5" Lower pulley?

    Quote Originally Posted by Doc GTO View Post
    Another member of the CTSV forum has it on his M6 car and makes 16psi with it. With my 2.38 upper I'm at 14psi as a comparison. He made 576 and I made 563rwhp. Same tuner and both DynoJets.
    Assuming your car is an A6 your making more power at 14psi vs his 16psi. Manual cars have less drivetrain loss so should dyno about 8% higher than and automatic. So if your car was a manual you would be in the mid 580's. I know you both dynoed within two days of each other in identical weather conditions so I'm assuming your mods helped control your IAT2's better. Would love to see both vehicles data logs to see how much more efficient the cooling system works with upgrades.

  16. #15
    Luna. is offline Cadillac Owners Connoisseur
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    Re: who is using the 10.5" Lower pulley?

    Quote Originally Posted by ClarkkentCTSV View Post
    Assuming your car is an A6 your making more power at 14psi vs his 16psi. Manual cars have less drivetrain loss so should dyno about 8% higher than and automatic. So if your car was a manual you would be in the mid 580's. I know you both dynoed within two days of each other in identical weather conditions so I'm assuming your mods helped control your IAT2's better. Would love to see both vehicles data logs to see how much more efficient the cooling system works with upgrades.
    Yeah, I'm along this line of thinking as well. I've gone through a buttload of combinations and it's easy to over-spin the blower on our cars in relation to the other parts on the car. You need to upgrade a lot of parts when spinning the blower really fast & tossing even a 10" lower pulley by itself probably has some concerns. A few guys in Texas (GForce, 21st Century Muscle Cars, etc.) really seem to have mastered overspinning the blower---I'd talk to them before embarking on such an aggressive strategy.

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