A very detailed CTS-V Belt and Pulley Combo Size Guide with Part Numbers
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Thread: A very detailed CTS-V Belt and Pulley Combo Size Guide with Part Numbers

  1. #1
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    A very detailed CTS-V Belt and Pulley Combo Size Guide with Part Numbers

    Spent the better part of today putting this together on our blog page. I've got notes all over my desk of different size belts for different size combos, as well as other guides online, and recommendations from members, and put it all together into one big detailed guide. Feel free to share anywhere on the net you'd like

    **NEW LINK**

    https://www.havocspeed.com/ctsv-zl1-...er-belt-guide/
    Last edited by [email protected]; 05-01-2016 at 09:00 AM.
    Cityboy414 and MYV like this.

  2. #2
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    Thanks -looks like a lot of work.
    Currently driving my wife crazy
    Sold: 2010 CTS-V M6 Sedan blk/blk

  3. #3
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    Thanks it came from months of my personal notes, and used a few other guides online to fill in the blanks, did the math, and put it together neatly. I spent a solid 8 hours on it yesterday listing all the individual belts on the site with part numbers, SEO friendly links, etc.

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  5. #4
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    "Like".

    How about stickying this?
    MYV likes this.

    Instagram: neuronbob
    Delivered 12/13/2012: 2013 CTS-V Wagon, Opulent Blue/Ebony 6MT/Ultraview/Satin Graphite wheels/yellow calipers/Stainless Works catback exhaust/KPE-Airaid intake
    Retired: 2009 CTS-V Sedan, Radiant Silver/Ebony auto/nav/Ultraview

  6. #5
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    Bookmarked.

    Thank you.
    09 CTS-V - 675rwhp / 642rwtq - New Era CAI, 2.5" upper, 9.5" lower, GT9, ID1300's, KB BAP, Fluidyne HX, Norcal Icebox, B&B Test pipes, stock mufflers, E-85.
    Tuned by SQC in ABQ.

    2009 Cadillac CTS-V : 10.99 @ 125.87 MPH | 6673ft DA

  7. #6
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    Made a few little tweaks to the layout, corrected one of the belt links to the store

  8. #7
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    great job! Thanks
    ~ 09 Blue Diamond Tricoat V ~ Stock... no more!

    My other car is:

    Quote Originally Posted by RaVeNous
    Ban the assault CTS-V. No high capacity fuel cells. No pistol grip shifters. No exhaust silencers.

  9. #8
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    Which belt would be best if you were a street racer and you were trying to be discreet about your pulley setup (aka: no green belts!) Specifically talking 2.5 pulley and 100mm idler setup? What would you go with? Thanks!
    Last edited by Purple87SS; 08-14-2013 at 08:46 AM.
    2010 Black Raven Auto
    Airaid intake, Mamo TB, Ported Snout, 2.5 Pulley, Solid Isolator, FIC 1000s, Stainless Works Catback, NGK TR7ix plugs, Moroso catch can, ZL1 Lid, Complete Street Performance Tune

  10. #9
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    Gates or Napa, they're both the same belt, Napa belts say Gates Napa right on them. They're black, and they're a great belt

  11. #10
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    Bumping this again for it's usefulness. Came in handy just now.
    09 CTS-V - 675rwhp / 642rwtq - New Era CAI, 2.5" upper, 9.5" lower, GT9, ID1300's, KB BAP, Fluidyne HX, Norcal Icebox, B&B Test pipes, stock mufflers, E-85.
    Tuned by SQC in ABQ.

    2009 Cadillac CTS-V : 10.99 @ 125.87 MPH | 6673ft DA

  12. #11
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    Does anyone still have the link I posted Cached ? We had a host issue. That page is gone, and so is a lot of the old site. Putting up a standard site for the time being. I'd really like to have that belt guide back instead of rebuilding it
    Diamond V likes this.

  13. #12
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    SAweet, looks like I had a cached copy lol. Clicked the link and told me a cache copy was available. Loading it into new site now, will post updated link tonight

    edit - https://www.havocspeed.com/ctsv-zl1-...er-belt-guide/
    Last edited by Anthon[email protected]; 05-01-2016 at 09:01 AM.

  14. #13
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    Cool - was wondering why it wasn't working for me!
    CTS-V: Celebrating 3 generations of N.F.G.


    Because groceries deserve LS power, too!

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    I'm a little confused. I use K080653hd with a 2.38, 100mm, stock lower
    Mods:
    2.55 / 9.1 pulley combo, 50 & 100 mm idler, Mamo ported TFS 255 heads, Dynospeed 4.5 Intake w/ side swipe/pocket protector,
    Jeremy Formato ported blower and snout, NW102, Weapon X 36" HX, LPE Varimax pump, Norcal HX tank, ZLI Lid w/ -12AN fittings,
    LT1Z Stage 2 cam, Brian Tooley kit / Johnson lifters, TR7IX plugs, ID850's, ARH catless, stock muffs, SMC dual catch cans


    built by JRG (Eastbay California)
    Tuned By LT1Z

  16. #15
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    How much slack is left in the tensioner ? I've used majority of these combos in house and these were the belt sizes we used. We typically install a belt that fits on the fairly tight side so it can't come loose or slip. How far does the tensioner spring back after you slip belt on ? On a brand new cold belt, with these belt sizes, the tensioner doesnt move much at all, it leaves the tensioners full range of movement to keep the belt tight

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    Is it true that a 2.5/9.55 *requires* a relocation bracket?

    bigair did this combo and did not use such a bracket.
    09 CTS-V - 675rwhp / 642rwtq - New Era CAI, 2.5" upper, 9.5" lower, GT9, ID1300's, KB BAP, Fluidyne HX, Norcal Icebox, B&B Test pipes, stock mufflers, E-85.
    Tuned by SQC in ABQ.

    2009 Cadillac CTS-V : 10.99 @ 125.87 MPH | 6673ft DA

  18. #17
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    As far as I know the 9.55 will not fit with just the 50mm idler and will require the bracket. If you did get it to fit it's news to me. It's recommended by Metco beyond the 9.1" We typically go all the way to 10.5" and that certainly requires the bracket

  19. #18
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    Quote Originally Posted by [email protected] View Post
    As far as I know the 9.55 will not fit with just the 50mm idler and will require the bracket. If you did get it to fit it's news to me. It's recommended by Metco beyond the 9.1" We typically go all the way to 10.5" and that certainly requires the bracket
    I know bigair is running this combo (9.5/2.5 with 50mm idler) w/o the bracket. I will have the setup soon hopefully, so I will report back as well.
    09 CTS-V - 675rwhp / 642rwtq - New Era CAI, 2.5" upper, 9.5" lower, GT9, ID1300's, KB BAP, Fluidyne HX, Norcal Icebox, B&B Test pipes, stock mufflers, E-85.
    Tuned by SQC in ABQ.

    2009 Cadillac CTS-V : 10.99 @ 125.87 MPH | 6673ft DA

  20. #19
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    Just an update regarding 2.5/9.5 combos.

    K080685HD was too small. I have a 100mm idler - I think it would fit with the stock idler. bigair is running stock idler and belt fits. I ended up going with the K080690HD (1 size up from recommended belt size).

    I may try putting the stock idler back on to replace the larger 100mm and use the recommended belt size to see which gives me the tightest fit.

    Also, neither of us are running the relocation bracket. It's a close fit with the 50mm idler, but nothing rubs.

    09 CTS-V - 675rwhp / 642rwtq - New Era CAI, 2.5" upper, 9.5" lower, GT9, ID1300's, KB BAP, Fluidyne HX, Norcal Icebox, B&B Test pipes, stock mufflers, E-85.
    Tuned by SQC in ABQ.

    2009 Cadillac CTS-V : 10.99 @ 125.87 MPH | 6673ft DA

  21. #20
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    Okie dokie, thanks for the update, will adjust article. thanks
    Diamond V likes this.

  22. #21
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    Interesting.

    How many failures of the 50mm bearing have there been? I am contemplating using the relocation bracket rather than the 50mm to keep that bearing from excess rpm.

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    Quote Originally Posted by neuronbob View Post
    "Like".

    How about stickying this?
    Quote Originally Posted by Purple87SS View Post
    Which belt would be best if you were a street racer and you were trying to be discreet about your pulley setup (aka: no green belts!) Specifically talking 2.5 pulley and 100mm idler setup? What would you go with? Thanks!
    Quote Originally Posted by [email protected] View Post
    Made a few little tweaks to the layout, corrected one of the belt links to the store
    Quote Originally Posted by Karch View Post
    Interesting.

    How many failures of the 50mm bearing have there been? I am contemplating using the relocation bracket rather than the 50mm to keep that bearing from excess rpm.
    I don't know how many but I would say enough to warrant using the bracket.

    From Tap uh talk
    CTS-V: Celebrating 3 generations of N.F.G.


    Because groceries deserve LS power, too!

  24. #23
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    Notes about bracket added, 9.55/2.55 combo with idler adjusted in regards to the slightly longer belt when the 100mm idler is used. Thank you guys

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    Is the 100mm idler a must have or nice to have when running just a 2.4 or 2.5 upper?

  26. #25
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    Quote Originally Posted by 1800bigk View Post
    Is the 100mm idler a must have or nice to have when running just a 2.4 or 2.5 upper?
    When running a smaller blower pulley the 100mm idler helps give more belt wrap around the pulley to help resist belt slip.


    Sent from my iPhone using Tapatalk
    2009 CTS-V
    Black Raven
    6MT

    - Metco 2.4 interchangeable upper blower pulley
    - Metco Solid Isolator
    - ZL1 Blower lid
    - BTR Stage 2 Cam kit (Cam, springs, retainers, pushrods, ARP cam bolts, cam gear,timing chain)
    - Squash Fuel system
    - DSteck E85 Sensor and bypass with plug and play harness
    - Injector Dynamics ID1000 injectors
    - Centerforce DYAD Clutch
    - Eibach Sedan Lowering Springs (UNCUT)
    - WeaponX competition Radiator
    - SLP 160° Thermostat
    - Fluidyne Jumbo Triple Pass Heat Exchanger with dual 8" Spal Fans
    - ZR1 LS9 Heat Exchanger Pump
    - Dyno tune by Ryne Cunningham at Cunningham Motorsports
    - New Era Intake With Larger Green Filter
    - SideSwipe Grille Intake Scoop
    - Removed Catalytic Convertors (primary and secondary)
    - NGK TR7IX plugs
    - MSD Plug Wires
    - Taylor Plug Wire Insulators

  27. #26
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    Everything will physically install without it, it is there to add belt wrap around the supercharger pulley. The smaller the pulley, the less surface area the belt has, the less leverage it has on the blower, and the faster it is trying to turn it. Belt slip will most likely be an issue with smaller than stock supercharger pullies, and the 100mm idler will do nothing but help.

  28. #27
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    Quote Originally Posted by v-locity View Post
    When running a smaller blower pulley the 100mm idler helps give more belt wrap around the pulley to help resist belt slip.


    Sent from my iPhone using Tapatalk
    treed

  29. #28
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    Ok thanks. Just asking because I put the 100mm metco idler on and during the install I noticed that the factory idler pulley seems 100 times more stout and reliable than the metco one. The metco one feels chinsy in comparison and I want to put the factory one back on.

  30. #29
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    Just because the pulley "feels chinsy" doesn't mean it is. It is just a lighter stronger material.

    Sent from my Nexus 10 using Tapatalk
    2009 CTS-V
    Black Raven
    6MT

    - Metco 2.4 interchangeable upper blower pulley
    - Metco Solid Isolator
    - ZL1 Blower lid
    - BTR Stage 2 Cam kit (Cam, springs, retainers, pushrods, ARP cam bolts, cam gear,timing chain)
    - Squash Fuel system
    - DSteck E85 Sensor and bypass with plug and play harness
    - Injector Dynamics ID1000 injectors
    - Centerforce DYAD Clutch
    - Eibach Sedan Lowering Springs (UNCUT)
    - WeaponX competition Radiator
    - SLP 160° Thermostat
    - Fluidyne Jumbo Triple Pass Heat Exchanger with dual 8" Spal Fans
    - ZR1 LS9 Heat Exchanger Pump
    - Dyno tune by Ryne Cunningham at Cunningham Motorsports
    - New Era Intake With Larger Green Filter
    - SideSwipe Grille Intake Scoop
    - Removed Catalytic Convertors (primary and secondary)
    - NGK TR7IX plugs
    - MSD Plug Wires
    - Taylor Plug Wire Insulators

  31. #30
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    Yeah, there are hundreds if not thousands of those pulley's out there with no failures that I've ever heard of. And the blower belt is seperate from the main drive so worst case you lose the blower belt, car still runs and cools fine. It's just slower


 
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