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Old 07-25-2009, 07:39 PM   #1
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Underdrive pulley

Ok I have read that the underdrive pulley can add anywhere around 10lbs of torque to a mustang, the last car I had, I replaced the underdrive pulley and didn't get a noticeable difference (not a mustang), is it really true that it frees up that much torque and also can improve gas mileage by almost 2 mpg, if so where could I find a reasonable costing one considering I have seen them run up to $270
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Old 07-25-2009, 08:12 PM   #2
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Re: Underdrive pulley

I had this question a little bit ago and went ahead and bought it and gained 1.5MPG in the city and a little more on the Highway but I haven't felt any more HP or TQ. CJ Pony Parts has one for $256, here is a link.
http://www.parts123.com/parts123/yb....Z5Z5Z50000016b
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Old 07-26-2009, 02:53 PM   #3
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Re: Underdrive pulley

It's one of those modifications that you will see minimal gains for alot of money IMO. I would also look into an overdrive pulley for your alternator if you are going to run a system or alot of electronics off the car. An underdrive pulley can shorten the life of your alternator.
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Old 07-26-2009, 06:31 PM   #4
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Re: Underdrive pulley

Ok if replacing this isn't a good way to go what else should I spend my money on, I have 4.10 gears and a lsd getting installed Tuesday, I have diablosport pred. tuner, CAI, and exhaust system, what would be another good upgrade for a reasonable cost.
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Old 07-26-2009, 08:01 PM   #5
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Re: Underdrive pulley

Lower springs, sway bars, sub frame connectors, short throw shifter (if you have a manual?). By the way what do you call "reasonable cost" before I go on?
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Old 07-27-2009, 09:31 AM   #6
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Re: Underdrive pulley

they help, just not much as with most all bolt ons for most all cars
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Old 07-27-2009, 09:35 AM   #7
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Re: Underdrive pulley

I don't want to get into Forced Induction, so I want to stick to mods that are couple hundred dollars here and there
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Old 07-27-2009, 05:07 PM   #8
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Re: Underdrive pulley

Quote:
Originally Posted by obxdude018 View Post
I have 4.10 gears and a lsd getting installed Tuesday, I have diablosport pred. tuner, CAI, and exhaust system, what would be another good upgrade for a reasonable cost.
I didn't see t-lok that is a must for any mustang V6 owner. Long or short tube headers, light weight/aluminum drive shaft. Then you should do some suspension modification so it could corner. Take a look at this site if you haven't.

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