Underdrive pullies: Opinions?

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Aug 7, 2006 | 03:08 PM

#21

TexaStang

Mach 1 Member

Joined: October 20, 2005

Posts: 717

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Have had mine for 9,000 miles now. Granatelli's. Work great, live in West Texas where it's often 105+. No noticeable loss of AC power.

Aug 7, 2006 | 04:12 PM

#22

scramblr

Legacy TMS Member

Joined: August 14, 2005

Posts: 1,217

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From: Spangdahlem Air Base Germany

Quote:

Originally Posted by esorense

Its likely that folks installing UDP's have likely taken the plunge with a CAI & SCT tuner as well. The SCT tuner as a 'user selectable option' for a reflash allows the user to adjust their idle speed. If idle speed was increased 100-200 RPM (car would then idle @ 800 -900 rpm) wouldn't that offset slower pulley rotational speeds caused by UDP installation? IMHO if a UDP is installed the user could reflash their car again w/ their SCT device to increase idle speed.

FWIW: I'm a S197 V6 guy and jealous of U S197 V8 guys having all the choices for UDP's, esp the STEEDA

. I'm still awaiting a decent UDP for the V6 4.0 motor. I'm a believer in this upgrade but the aftermarket I don't think has caught up to us V6 guys in the UDP dept. I wish Steeda would come out w/ one for us, too.

In theory that's correct, i.e., at idle, higher RPMs could make up the difference for the UDPs, however, how often are we at idle? So we're running the components at slower speed to free up drag from the engine. Not a bad thing and I haven't heard of anyone having any ill effects from it to date. I know some alternators have gone out, but don't think the UDPs where the cause.