I fitted Raby's underdrive pulley 3 years ago, with no overheating, voltage or A/C problems. The climate here is sub tropical (similart to Southern CA) so the heat + traffic I thought could be a potenetial problem - but it wasn't...
On installation I checked the alternator voltage output and by the time the engine revs were up to 1200rpm, the voltage had stabilised. According to Raby, he tested it out on his wifes car for many thousands of miles with all the electrical devices switched on, A/C at full capacity in heavy traffic - no long term problems. Plus you get the added performance.
And if you don't like it, just swap back to the original - its not permanant if you don't want it to be.
Probably my best mod yet.....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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