Tell Me About Under Drive Pulleys - Mustang Evolution

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Old 11-28-2014, 04:35 AM   #1
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Tell Me About Under Drive Pulleys

How much HP and torque gains will they produce, does it affect negatively the water pumping, engine cooling and alternator output? Are there different steps in the under drive system similar to gear ratios ie 3:27, 3:34, 3:73 etc?
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Old 11-28-2014, 12:39 PM   #2
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Underdrive pulleys

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An underdrive pulley refers to a crankshaft or accessory pulley (a/c, alternator, power steering, water pump, etc.) designed to turn at a slower speed than stock. To Underdrive means to slow the rate of rotation in a system. Underdrive is achieved by either making the crank/main (drive) pulley smaller or the accessory (driven) pulley larger than the original diameter pulleys.

Underdrive pulleys increase engine output by reducing the draw of the engines accessories by slowing them down and reducing the HP they use. Horsepower gains from underdrive pulleys can vary by vehicle, engine, number of accessories and the amount of underdrive (Improvements of up to 5-15 HP at the wheels have been seen). Additional and significant performance improvements can be seen by reducing the weight of the pulley versus the original pulley. Gains can range from 3-6HP per pound of weight reduced.

Poorly engineered underdrive pulleys can cause unwanted side effects, this is due to not spinning the alternator, power steering, and/or air conditioning fast enough. This leads to low alternator voltage, weak/no power steering assist, and weak/no air conditioning effectiveness, especially at idle/low rpm. The most commonly seen result is lighting may dim, or the stereo may cut out. Too much underdrive for a race car is not much of a concern due to the high rpm's they run at, but for daily driven vehicles it can lead to a dead battery if too much time is spend at idle or low/rpm.
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Old 11-28-2014, 12:44 PM   #3
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You said you plan to go forced induction so you would have to put your stock pulleys back on when the time comes.
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Old 11-28-2014, 01:41 PM   #4
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For the next year with CAI, Off-Road X-Pipe, Magnaflow mufflers, Bama tune, maybe ported throttle body and used as my daily driver 3 or 4 days per week on two miles to visit a friends HotRod shop then another mile to the Post Office then on the way home go five miles past the house and turn around and clean the plugs off coming back. Then in January to Florida to run a 1/2 mile top speed meet then it will get busy. Would it be a worth while change? If I can pickup 5 to 7 BHP for the cost of a quality pully and a new serpentine belt which I am going to have changed along with all hoses and full service before the Fla. event. What do you or anyone else think?
Thanks
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Old 11-28-2014, 02:34 PM   #5
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I say go with Steeda's, best udp's you can get and piece of mind. Unlike other ones where you bolt on a pulley to the Crank pulley.
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Old 11-28-2014, 03:30 PM   #6
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Where is the best place to buy Steeda udp at and on an 04 GT is there a selection to be made size etc.?
Thanks for the help
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Old 11-28-2014, 03:59 PM   #7
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I believe you can purchase them on American Muscle.

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Old 11-28-2014, 04:28 PM   #8
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AM sells them and you can get them for a good price using the forum discount. They only come in one size. Just make sure you get the right ones for your year. the early models like 99-01 i think have a different water pump pulley then the 02-04.
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Old 11-28-2014, 04:32 PM   #9
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Again thanks, I will go to work on researching it tonight.
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Old 11-28-2014, 08:39 PM   #10
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just don't buy the bbk ones, go with steeda like cheech said.
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Old 11-28-2014, 08:46 PM   #11
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Quote:
Originally Posted by Landspeedracer View Post
For the next year with CAI, Off-Road X-Pipe, Magnaflow mufflers, Bama tune, maybe ported throttle bodyThanks
If your getting a CAI get a JLT intake, it requires a tune and as far as I know is the only useful one and since you plan to buy a tuner anyways. Don't go with Bama go with another tuning company. I hear Acucfab is the throttle body to buy.
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Old 11-28-2014, 08:59 PM   #12
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If your getting a CAI get a JLT intake, it requires a tune and as far as I know is the only useful one and since you plan to buy a tuner anyways. Don't go with Bama go with another tuning company. I hear Acucfab is the throttle body to buy.
Who are you hearing that from lol? the throttle body I mean
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Old 11-28-2014, 09:22 PM   #13
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Who are you hearing that from lol? the throttle body I mean
friends, forums, google lol apparently they flow the best
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Old 11-28-2014, 09:25 PM   #14
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Good info guys, better the voice of experience than sales propaganda,
Thanks
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Old 11-29-2014, 03:40 AM   #15
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Anyone have any experience with SR Performance black aluminum underdrive pulleys?
They are 1/2 the price of the Steeda kit and includes the bolts same as Steeda. If Ihad not consulted with the forum I would have gone ahead and ordered the BBK kit, thanks for forewarning me.
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Old 11-29-2014, 04:07 AM   #16
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SR = Shoulda Reconsidered.

SR is pretty much for the people who want to modify their cars but want to do it as cheaply as possible and don't really care about the results, they pretty much want a "modded" yet not much faster than stock car.

There is a reason Steeda is much more than SR


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Old 11-29-2014, 05:30 AM   #17
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That's the reason I like to ask the people that have lived and experienced it. Believe me I want modded but I want a tremendous amount more HP than stock. No need in spending $120.00 more if the SR would do the job but in turn no need in flushing $139.00 down the toilet with a product that wouldn't produce.
Once again Thanks,
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Old 11-29-2014, 06:43 AM   #18
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Old 11-29-2014, 09:32 PM   #19
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Another vote for the Steeda UDP's. "Do it right, do it once!" Cheap is too often spelled C-R-A-P. I did not really expect much in the way of improved performance but I got a good deal on them so . . . To my surprise I could really feel the difference in acceleration. Woot
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Old 11-30-2014, 09:26 AM   #20
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That's the kind of result I am looking for.
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Old 11-30-2014, 09:42 AM   #21
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I've got UDPs on my '04 GT!.. Can't say I've noticed much "power" gain, but it does rev up faster!..


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Old 11-30-2014, 11:00 AM   #22
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So you don't think it will worthwhile, you know revving up with less resistance could mean that you get up to speed faster.
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Old 11-30-2014, 01:37 PM   #23
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So you don't think it will worthwhile, you know revving up with less resistance could mean that you get up to speed faster.

Actually I do think they are worth it!.. Because it revs up quicker, you will get into your Power Band faster!..


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