[John Galt]

What length belt (SKU# included preferably) do I need to run for a 2.75" upper pulley and stock lower on a 2011 LSA? I tried using the Weapon-X pulley information table but the 2.75" is not listed.

 

[matthewg]

Did you ever get an answer to this? I am adding an LSA to a project car right now and will be running the same belt setup. I have GM OEM crank pulley and then a 2.75 griptec

 

[mememe123]

You should be able to use stock size belt with 2.75 upper, if not, maybe throw on 100mm idler pulley and that should help.

 

[matthewg]

You should be able to use stock size belt with 2.75 upper, if not, maybe throw on 100mm idler pulley and that should help.

What would be the advantage of the 100mm pulley? Reduce belt slippage if any presents itself I assume?

 

[mememe123]

Reduce slippage, and more belt wrap (your case).
Like I said, I would try stock belt first.

 

[jcs003]

@Mont Motorsports has a calculator if I remember correctly.

 

[matthewg]

Reduce slippage, and more belt wrap (your case).
Like I said, I would try stock belt first.

Thanks for clarifying! I will do that!