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07-15-2018, 02:21 PM
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#1 |
 
Drives: 2016 white 1SS Join Date: Sep 2016
Location: Lowell, Ar
Posts: 45
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Procharger belt ?
Need some help figuring out which belt I'll need for the new pulley. D1X has a 4.25 pulley on it at the moment, going to a 3.85. Any idea how much shorter it needs to be?
Thanks for any input. *** |
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07-15-2018, 03:43 PM
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#2 |
          Drives: SS 6 speed of course Join Date: Jan 2016
Location: Hilo, HI
Posts: 4,316
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was going to ask the opposite question, what belt are you using now... Just got my d1x with 4.50 pulley
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
Last edited by oldman; 07-15-2018 at 07:56 PM. |
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07-15-2018, 03:51 PM
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#3 |
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Drives: 2016 white 1SS Join Date: Sep 2016
Location: Lowell, Ar
Posts: 45
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These are the number I could find on it. Hope they help!
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07-15-2018, 09:01 PM
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#4 |
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Drives: SS 6 speed of course Join Date: Jan 2016
Location: Hilo, HI
Posts: 4,316
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HP Addicts says I need a gates Gates 465-K080653 for a 4.5 pulley and that specs out to 65.922 inches OD. My 4.0 pulley came with a Napa 25-080645 which has a pitch length of 64.5. Don't ask me what pitch length is, I thought the Napa belt was a little loose and was near the max adjust of the tensioner...
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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07-15-2018, 09:28 PM
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#5 |
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Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016
Location: Norman, OK
Posts: 2,424
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The 08-645 is the stock belt size on the 4.25" pulley, if you look for a Gates belt as the parts store to put a "HD" at the end of the part # for the heavy duty belt that doesn't stretch as much.
You will need a smaller belt for sure. The formula for circumference is 2*Pi*R^2 If the stock pulley is 4.25" (This is the diameter) then the radius is 2.125". The circumference of that pulley is 13.35" which is 339.04mm. The 3.85" pulley has a circumference of 12.1" which is 307.34mm. That is around 32mm smaller in circumference. I would say start with a 25mm smaller belt and go from there. |
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07-15-2018, 09:29 PM
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#6 |
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Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016
Location: Norman, OK
Posts: 2,424
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Oldman you needed a smaller belt as well for that 4.0" belt.
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