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Old 02-20-2007, 04:29 PM   #1
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Under drive pulleys, should I or shouldn't I?

I have an 03 GT with 4.6, off road x pipe, flow master 40's, 3.73 gear, mhw shifter, bbk cold air kit,
I have been thinking about getting under drive pulleys before I have the dyno tune done. I drive the car on the street and on long trips from time to time. I live in the middle of Florida.
I have had two speed shops tell me not to get them.
What do you people think?
Thanks in Advance
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Old 02-20-2007, 04:35 PM   #2
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Re: Under drive pulleys, should I or shouldn't I?

Do you have alot of accsessories... System or anything that would use more battery than normal?
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Old 02-20-2007, 05:27 PM   #3
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Re: Under drive pulleys, should I or shouldn't I?

What he said. We have pullies, but don't have a kickin stereo, and also spends a lot of time at higher rpm since it's highway all the way to work. If you are in stop in go alot, charging the battery might be a problem.
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Old 02-20-2007, 05:38 PM   #4
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Re: Under drive pulleys, should I or shouldn't I?

I never had any issues with a crank only under drive (25%) dont expect much from them as with any bolt on but ... they do help gas milage a tad.
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Old 02-21-2007, 02:51 PM   #5
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Re: Under drive pulleys, should I or shouldn't I?

I dont know why everyone says they effect the battery and charging cause i had a UDP on my old V6 ontop of a system that was pushing 2 1000.1 amps to my subs and never once did it make a differ.

On an older car it does but not on newer cars.

I say go for it I noticed a differ when i put mine on not much but just enough
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Old 03-01-2007, 12:00 AM   #6
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Re: Under drive pulleys, should I or shouldn't I?

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I never had any issues with a crank only under drive (25%) dont expect much from them as with any bolt on but ... they do help gas milage a tad.
I to have had no problems and i have a system but the only thing it helps is the car revs and drops revs a bit quicker as long as you get the lightwieght underdrive crank pulley. Gas mileage does increase a bit
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Old 03-01-2007, 12:15 AM   #7
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Re: Under drive pulleys, should I or shouldn't I?

^ how do you have a profile for your stang but dont have any pictures in it?? come on man. lol. i went to a shop once and asked about a whole bunch of performance mods when i was still learnin what to/not to do with the 6er. the shop owner/top mechanic said that he always told ppl to stay away from them and he also said that if a car came in with ud pulleys, he would take them off of the persons car and put stocks back on. how gay is that. im like yea and you wanna do work on my car. lol. so, i have always been told not to put ud pulleys on cuz the gains arent worth the possible negatives. just thought id share.
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Old 03-01-2007, 12:19 AM   #8
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Re: Under drive pulleys, should I or shouldn't I?

i just joined the site havent loaded any yet and ive heard nothing but good ive never heard anything bad about them
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Old 03-01-2007, 12:22 AM   #9
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Re: Under drive pulleys, should I or shouldn't I?

I've heard alot of bad about them but i dont have any issues same battery has been on my car since i bought it over a year ago.
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Old 03-01-2007, 12:23 AM   #10
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Re: Under drive pulleys, should I or shouldn't I?

What have you heard
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Old 03-01-2007, 12:26 AM   #11
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Re: Under drive pulleys, should I or shouldn't I?

They cause over heating issues,charging issues etc. i dont care what people say my car is living proof its BS for the simple fact i beat the living **** out of the motor and i have yet too have it overheat or a dead battery.
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Old 03-01-2007, 12:30 AM   #12
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Re: Under drive pulleys, should I or shouldn't I?

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They cause over heating issues,charging issues etc. i dont care what people say my car is living proof its BS for the simple fact i beat the living **** out of the motor and i have yet too have it overheat or a dead battery.
Same here not a problem
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Old 03-01-2007, 03:13 PM   #13
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Re: Under drive pulleys, should I or shouldn't I?

No problems here and ive had mine for about 6 months now and i have a system
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Old 03-01-2007, 03:57 PM   #14
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Re: Under drive pulleys, should I or shouldn't I?

I have the march piggybacks and never any issues. Theyre what, 150$, theyre a pita to install, and they give you zero sotp gains. so yeah, if they werent such a pain id uninstall them and sell them off, but im lazy so ill just leave them on for now. but yeah, in retrospect, i wouldnt do them again if i ever got another car.
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Old 03-08-2007, 06:23 AM   #15
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Re: Under drive pulleys, should I or shouldn't I?

OK, I've heard pros and cons with most of your guys' stangs but what about with mine. I have a Saleen supercharger and no system. What it be worth my money to get them?
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Old 03-08-2007, 10:27 AM   #16
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Re: Under drive pulleys, should I or shouldn't I?

i personally thought it was worth it. I noticed a difference when I put them in
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Old 03-09-2007, 12:00 PM   #17
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Re: Under drive pulleys, should I or shouldn't I?

I had the crank UDP and the alternator pulley as well when I had the air ride on. I had issues with that because the compressor would draw off the battery and with the smaller pulley for the alternator the charging system wasnt able to keep up so I did have to replace my battery later. I took them off when I took off the air ride but I put the crank UDP on only again. Acceleration is a tad bit quicker as well as the RPMs and I was able to rev higher between shifts. I havent had any problems with just the UDP so I think its worth it.
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Old 03-09-2007, 12:52 PM   #18
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Re: Under drive pulleys, should I or shouldn't I?

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i personally thought it was worth it. I noticed a difference when I put them in
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Old 03-09-2007, 03:07 PM   #19
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Re: Under drive pulleys, should I or shouldn't I?

I'd say buy a crank pulley and leave it at that. I started out with an entire set, but eventually took off the alternator and water pump pulleys due to various issues.

The crank pulley is definitely worth it though in my opinion. Pretty cheap for the gains.
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Old 03-09-2007, 03:15 PM   #20
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Re: Under drive pulleys, should I or shouldn't I?

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OK, I've heard pros and cons with most of your guys' stangs but what about with mine. I have a Saleen supercharger and no system. What it be worth my money to get them?

No, do not get them. If you were N/A like most of the people here, I would say definitely get them. Being blown, do not get them. While they may work out just fine, there is no sense in slowing down your water pump and risking any heat related issues. The gains are not worth the risk in my opinion.
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Old 03-09-2007, 10:01 PM   #21
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Re: Under drive pulleys, should I or shouldn't I?

Ha, rob, you beat me to it.

DO NOT put a udp on a supercharged car, you are just risking messing up more stuff. Also, if it slows down your accessories...wouldn't it slow down the supercharger too? Food for thought.
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Old 03-09-2007, 10:18 PM   #22
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Re: Under drive pulleys, should I or shouldn't I?

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Ha, rob, you beat me to it.

DO NOT put a udp on a supercharged car, you are just risking messing up more stuff. Also, if it slows down your accessories...wouldn't it slow down the supercharger too? Food for thought.
Only if the crank pulley was on the same belt. For example, on my car, I could put an UD crank on...and it not slow the SC down because the crank and the SC are on seperate belt systems. Only the alt is on the SC belt.

But ya....no udp for a blown car. 3-5 hp isnt worth the risk.
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Old 03-09-2007, 10:54 PM   #23
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Re: Under drive pulleys, should I or shouldn't I?

I looked into it and found that I can put a pulley on the SC itself and get at least 30-50 hp gain. Heard the same thing from 3 different performance shops. They all recommend that I DO NOT get the UDP's on the rest because I might actually lose power. Smaller pulley on the SC would mean more boost. Exactly what I'm looking for. Of course I need a good dyno tune and all but I'll be having all that done all at once when I get the off-road x-pipes and LT headers and 4:10 rear end.
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Old 03-09-2007, 10:58 PM   #24
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Re: Under drive pulleys, should I or shouldn't I?

Long tubes will not boost your HP much (5-10 maybe, got an article you can read to find out why) but it will let you run an even smaller pulley and still stay on pump gas and that is how you gain HP.

As for the other part about they told you a smaller pulley...yes, get a smaller pulley. It is the same type of SC as the 03/04 cobras run...their first todo is always a pulley...pulley = power.

But, if you go too small and run too much boost...your internals will go boom unless you have them forged up.
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Old 03-10-2007, 09:44 AM   #25
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Re: Under drive pulleys, should I or shouldn't I?

I've been hesitant towards the LT headers due to my car being lowered. So in your opinion Pure Venom. what would YOU run header wise. I keep getting too many conflicting stories and I want to try to add them all up and then average them out if you know what I mean.
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Old 03-10-2007, 09:54 AM   #26
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Re: Under drive pulleys, should I or shouldn't I?

I put an overdrive pulley on the regal.. I noticed one heck of a difference
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Old 03-10-2007, 01:05 PM   #27
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Re: Under drive pulleys, should I or shouldn't I?

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I've been hesitant towards the LT headers due to my car being lowered. So in your opinion Pure Venom. what would YOU run header wise. I keep getting too many conflicting stories and I want to try to add them all up and then average them out if you know what I mean.
Headers are a good idea, but I would save them till later because the power gains are not going to be what is expected when compared to a NA car. They will, however, lower your boost levels while maintaining your power level and allow you to run more spark to increase the HP output.

As far as headers go though, I would recommend the stainless works long tubes. They look great in person and have a great sound.

To gain power, I would suggest running a smaller pulley on the SC, making sure you have good cooling in place like a good radiator and a good heat exchanger...then I would save the headers until you get everything set because they will be a big chunk of change.
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Old 03-10-2007, 04:10 PM   #28
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Re: Under drive pulleys, should I or shouldn't I?

Well I know that it would be easier to intall the headers while installing the x-pipes so they can go ahead and have the x-pipes cut to proper length. Like a one shot deal
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Old 03-10-2007, 07:55 PM   #29
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Re: Under drive pulleys, should I or shouldn't I?

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Well I know that it would be easier to intall the headers while installing the x-pipes so they can go ahead and have the x-pipes cut to proper length. Like a one shot deal
Actually, if you go with stainless works or kooks, just order their X pipes with the headers.
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Old 03-10-2007, 09:33 PM   #30
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Re: Under drive pulleys, should I or shouldn't I?

I'm actually having a performance shop do them for me. They're fabricating the x-pipes themselves. Plus, it's the only place around that'll do the off roads for me around here
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Old 03-19-2007, 03:05 PM   #31
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Re: Under drive pulleys, should I or shouldn't I?

I've had lots of problems with underdrives in the past, including on a 97 Cobra, but I grudgingly installed them on my 02 GT and have had zero charging or cooling issues. I usually just put the crank and water pump pullies on, and leave the alternator alone. Get a set with an SFI balancer, and it is a worthwhile upgrade. Power was up on the dyno per expectations - something like 8 HP if I remember right.

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Old 03-22-2007, 08:56 PM   #32
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Re: Under drive pulleys, should I or shouldn't I?

whoa, ACTUAL DATA!!!!!! something im not used to on this site
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Old 07-30-2007, 01:31 AM   #33
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Re: Under drive pulleys, should I or shouldn't I?

i could see how it would cause cooling and charging problems, cuz the alternator and water pump are spinning slower. but i have never actually seen it cause any problems... but i guess it could.
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