Quote:
Originally Posted by JWillis72
I am changing mine to air to air with 1000cc injectors( they stopped making 850cc), long tube headers, GTR plugs, 928 impeller and Stillen 9 lb pulley. I'm trying to decide if should add the pulleys on the back side or wait and see how it goes first.
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In my opinion, the front serpentine pulley should be the last one to downsize. It has the least amount of belt wrap (around 30%). The rear pulleys have over 50% wrap, a belt that is less likely to stretch under load, and are affected less by bracket-flex.
For the sake of minimizing belt-slip, it makes more sense to increase S/C rpms by changing the ratio of the rear pulleys or going with cogs. Or even take it a step further and upsize the front pulley to a high-traction 3.3".
When people start pushing this upgraded kit, the next road block is probably going to be belt-slip.