underdrive pulley

Mustang Brandon · 02-18-2004, 10:45 PM

ive been looking at a bunch of stangs and reading there mods list. a lot of them have an under drive pulley. i know where it goes on the engine but what does it do.

Streetstang v6 · 02-19-2004, 10:13 PM

All I know is that they add like 8 to 10 more hp I wanna get some to but my friend told me that it drains tha batt I don't trust him to much though cuz he lies allot but yea its a pretty good mod for like 80 bux for Mac under drive pulleys

Dave_mustang_50 · 02-19-2004, 10:35 PM

The diamater of the pullies are different. This is why the alternater might not charge fully, it will turn less than with the regular pulley. I had this problem at night with the lights and radio on. A local speed shop changed out the alt pulley and over drived it so it would fully charge. In short they turn your accessories less, which takes power.
Hope that helps

StangerGurl · 03-11-2004, 09:47 PM

This might be a little late, but an underdrive pulley does a few things. It increases HP a little, increases gas millage, and reduces wear on your belt driven accessories. Because the pulley slows down the belt, it's recomended that you get a different alternator that can handle the slower belt.

Hope this helps.

02-18-2004, 10:45 PM	#1
Mustang Brandon Registered Member Join Date: Feb 2004 Location: louisville, kentucky Posts: 88	underdrive pulley ive been looking at a bunch of stangs and reading there mods list. a lot of them have an under drive pulley. i know where it goes on the engine but what does it do.

02-19-2004, 10:13 PM	#2
Streetstang v6 Registered Member Join Date: Feb 2004 Location: Carson, Ca Posts: 4	I read that too All I know is that they add like 8 to 10 more hp I wanna get some to but my friend told me that it drains tha batt I don't trust him to much though cuz he lies allot but yea its a pretty good mod for like 80 bux for Mac under drive pulleys

02-19-2004, 10:35 PM	#3
Dave_mustang_50 Registered Member Join Date: Aug 1999 Location: New Port Richey, Florida Posts: 483	The diamater of the pullies are different. This is why the alternater might not charge fully, it will turn less than with the regular pulley. I had this problem at night with the lights and radio on. A local speed shop changed out the alt pulley and over drived it so it would fully charge. In short they turn your accessories less, which takes power. Hope that helps __________________ 1969 Mach 1 351C with a c6(for now) Sold 92 Rag Top GT Procharged & intercooled DSS 331 LC Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.

03-11-2004, 09:47 PM	#4
StangerGurl Registered Member Join Date: Mar 2004 Location: Arvada, Colorado Posts: 6	This might be a little late, but an underdrive pulley does a few things. It increases HP a little, increases gas millage, and reduces wear on your belt driven accessories. Because the pulley slows down the belt, it's recomended that you get a different alternator that can handle the slower belt. Hope this helps. __________________ --- If you can't beat em', blow their ear drums out with bass

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