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Belt slip, help...

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Old May 21, 2014 | 04:27 PM
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Default Belt slip, help...

LS3 + Paxton Novi 2200 with ECS brackets. ECS setup is for C6 vette and originally have both, active and static tensioners.

Think that i´m having belt slipping issues after few hard pulls. Could this be cause of too tight belt?

I´m kind of loss with term of tensioner types, is "active" spring loaded tensioner and "static", old school one that stays where it is? I´m from Finland and especially tecnical english is bit loss...

If it is so, im just having "static" tensioner.

Last year i had 6-rib drive, had some difficulties with belt slip, and belts popping 1-rib off. Some belts failed really fast.

But finally realized that Gates Micro-V, slightly overtighted and with just static tensioner (active one removed) worked pretty well.

This year, upgraded 8-rib drive. Now, after good abuse, boost is starting to drop on full pulls. Belt tightness is about same than with 6-rib.

Can´t think any other solution that when belt get`s hot, it starts to slip, but how the hell 8-rib slips but 6-rib holds....

Now thinking that i try to put that active tensioner back to it´s place, but can anyone think of any other cause / solution.

Need to get this fixed in two days. Car is competition 2gen drifting Camaro and our National Championship series starts next weekend.
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Old May 21, 2014 | 05:18 PM
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The belt stretches as boost increases.
That is why a spring loaded tensioner is required to adjust to this.
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Old May 21, 2014 | 06:05 PM
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Yep, a good strong spring tensioner is essential for a strong reliable belt drive.
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Old May 22, 2014 | 05:26 AM
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Ok, let´s believe it, i´ll try that spring tensioner back to its place.

I have quite or exatly similar charger brackets that this one, and same kind of tensioner.




Just wont understand how it didn´t worked out with 6-rib belt, or maybe that belt just stretched too much for tensioners movements, belt come off often when pulled to limiter and after instant gas lift.
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Old May 22, 2014 | 07:14 AM
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All other things being equal, a 6 rib will require more tension than an 8 rib. It may have been that the 6 rib you had just required too much tension and the "active" tensioner could not provide enough pressure.
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Old May 22, 2014 | 08:03 AM
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you want to make sure the belt is short enough so the tensioner isn't near the end of its travel (less tension)
on the Prochargers sometimes I use an add. fixed idler to get more belt wrap around the drive pulley, and a brace to eliminate any bracket flex
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Old May 22, 2014 | 01:23 PM
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I added that active tensioner and seemed Ok, movements were reasonable and no belt slip or pop so far. Can´t really test this on streets that much, but couple days and test this in action.

So this kit has static tensioner also in charger brackets, seems on that pic, you setup active tensioner to 12.30 o clock with that.

Belt goes well over 200 degrees over both pulleys.


Car is this one, so usage is quite harsh...
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