who has underdrive pulleys and what do you think about them?

[silverbullit05]

im looking for opions and facts about underdrive pulleys. i have a chance to get them dirt cheap but im concernd that lack of harmonic distortion from harmonic balancerless underdrive pulley will affect engine life? also does anyone have them on their g if so is there a gain. anyone have dynos before and after?

[G_whizz]

There is a massive thread about these if you do a search. Also check the Mod database sticky thread...

[silverbullit05]

thanx

[TeflonG35]

Ive been using UR underdrive pullies for some time now with no problems. If you are going with underdrive pullies you should go with a trusted name. Unorthodox racing makes some really good ones. Stillen.com even recommends them.

[cheapazz]

TEFLON.... Did you do the set or just the crank? I was looking into it and read on a website, I think it was either the stillen or unorthodox, that they recommend only the crank. Sound right? I was thinkin bout it too.

[silverbullit05]

the set im looking at is unorthodox and if im doing it im going to do all of the pulleys do to i will be replacing it myself and it looks like a pain to do. there is not much room to work with. so imo if ur going to do it also replace the set. i was told that the engine becomes much more responsive. but i was also told that u dont see the gain right away they say after about a week of driving it it gains its full potential. they say that the ecu needs to learn the new mod. but i will say that so far ive done td cat back, plenum spacer, grounding kit, popcharger, and i gained almost 20whp im hoping ill be around 25whp at the next dyno. soon to come mod are big bore intake tube, cobb tuning access port, and possibly hfcats.

[smockers83]

Only do the crank. Underdriving your accessories can lead to potential problems, particularly the alternator.

[CYO44Baseball32]

Don't get underdrive, get the regular size but just lighten. UR makes them for the G35 and also get the set. This is the best combo for the cars. I will be getting these when available for the G37