Underdrive=undercharge?

King Snake · 07-17-2000, 11:09 AM

Do those of you who have underdrive pulleys notice things like headlights dimming when at an idle, and brightening up when your revs come up? Also, does the A/C work as well with pulleys? Thanks for the info...

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'97 Cobra, K&N, Rio Red

[This message has been edited by King Snake (edited 07-17-2000).]

fixer · 07-17-2000, 09:10 PM

yep. its an inevitable consequence of underdrives. you'll also be noticing your fan coming on much more and your battery budget going way up.

T-Bone · 07-17-2000, 10:41 PM

No problems with mine so far. I have a 700 Watt stereo system and have no undercharging problems. Since I never ran my A/C before installing the pulleys, I'm not sure how they affect that. But, there is definitely a power loss when I kick on the A/C.

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'96 GT
5-speed,K&N air filter,Roush Cold Air kit,80mm MAF,Mac Cat-Back,Mac Pro Chamber H-Pipe, FMS 3.73's, FMS 70mm TB, Steeda Tri-ax, March U/D pulleys

T-Bone's '96 GT

Red Rocket · 07-17-2000, 11:25 PM

Underdrive's suck on the 32 valve. Not worth the agony and litte crap, like the previously examples mentioned, i.e., lights, battery, etc.

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1996 Laser Red Cobra. 12.64@108.1 mph; 1.92 60 ft. I keep racin' it, and it keeps getting faster!(It's still a heavy beast)

97snakedriver · 07-17-2000, 11:31 PM

I have some friends that have had good results with Steeda pulleys on DOHCs. It probably varies from brand to brand.

King Snake · 07-18-2000, 11:33 AM

I was once all gung-ho about getting underdrives, but now I think I have changed my mind. It just sounds like you have to sacrifice reliability and your electrical system's ability to function properly for just a few horsepower.

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'97 Cobra, K&N, Rio Red

07-17-2000, 11:09 AM	#1
King Snake Registered Member Join Date: Jan 2000 Location: Warner Robins, GA, USA Posts: 210	Underdrive=undercharge? Do those of you who have underdrive pulleys notice things like headlights dimming when at an idle, and brightening up when your revs come up? Also, does the A/C work as well with pulleys? Thanks for the info... ------------------ '97 Cobra, K&N, Rio Red [This message has been edited by King Snake (edited 07-17-2000).]

07-17-2000, 09:10 PM	#2
fixer Registered Member Join Date: Aug 1999 Location: mesa,az,usa Posts: 457	yep. its an inevitable consequence of underdrives. you'll also be noticing your fan coming on much more and your battery budget going way up.

07-17-2000, 10:41 PM	#3
T-Bone Registered Member Join Date: Jan 2000 Location: Minot AFB, ND Posts: 138	No problems with mine so far. I have a 700 Watt stereo system and have no undercharging problems. Since I never ran my A/C before installing the pulleys, I'm not sure how they affect that. But, there is definitely a power loss when I kick on the A/C. ------------------ '96 GT 5-speed,K&N air filter,Roush Cold Air kit,80mm MAF,Mac Cat-Back,Mac Pro Chamber H-Pipe, FMS 3.73's, FMS 70mm TB, Steeda Tri-ax, March U/D pulleys T-Bone's '96 GT

07-17-2000, 11:25 PM	#4
Red Rocket Registered Member Join Date: Jul 2000 Location: Chicago, IL Posts: 25	Underdrive's suck on the 32 valve. Not worth the agony and litte crap, like the previously examples mentioned, i.e., lights, battery, etc. ------------------ 1996 Laser Red Cobra. 12.64@108.1 mph; 1.92 60 ft. I keep racin' it, and it keeps getting faster!(It's still a heavy beast)

07-17-2000, 11:31 PM	#5
97snakedriver Registered Member Join Date: May 1999 Location: Blacksburg, VA Posts: 1,526	I have some friends that have had good results with Steeda pulleys on DOHCs. It probably varies from brand to brand.

07-18-2000, 11:33 AM	#6
King Snake Registered Member Join Date: Jan 2000 Location: Warner Robins, GA, USA Posts: 210	I was once all gung-ho about getting underdrives, but now I think I have changed my mind. It just sounds like you have to sacrifice reliability and your electrical system's ability to function properly for just a few horsepower. ------------------ '97 Cobra, K&N, Rio Red