To those who say underdrive pulleys don't work

jhonda said:

Your wrong. I have a 91 mustang with offroad x pipe, c&l 76mm maf and tube, magnaflow catback, ford udp (except for alternator), and rebuilt rear end with stock 3.08 gears. Before I did the pulley swap I could only spin second gear about 20ft, after I installed them I can spin them for 125ft and that was down a slight hill.

Thanks
Jason

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Never heard anyone say that pullies don't work, but if you think underdrive pullies added 105ft to your burnout facing downhill, you are god damn nuts.
If 8rwhp gets you 105ft, how far you think you can do a burnout with an extra 75rwhp? Till the tires fall off?

They are worth a tenth in the quarter, hardly enough to celebrate.

XP8 all up in your grill.......
I agree. they work, but prolly not that well. Something else must have changed (cooler weather etc)

yeah i have way more mods than you and i cannot spin them 125ft, If i have my good tires on I can spin them maybe 3ft in 1st, and chirp 2nd. I say you spun them maybe 20ft.........

I put on pullies and left the alternater pulley off and kept the stock one. Then i got a shorter belt. It works fine!

i changed the water pump an crank pullies an left the alt pulley in my aod car an never had a prob with overheating an i drove it as a dd in the summer with a/c. but i didnt have power windows or seats or a big amp stereo. the stock temp guage did read a little higher but not enough to worry about.

slow95gt said:

yeah i have way more mods than you and i cannot spin them 125ft, If i have my good tires on I can spin them maybe 3ft in 1st, and chirp 2nd. I say you spun them maybe 20ft.........

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I had 26x11 slicks on my car and pedalling it through 1st and second have a good 300+ foot marks. Spinning tires doesn't mean much as there are 15000 variables that go into it. There have been days I have spun into 4th, others where I barely spin into 2nd.

To add to all of this, a longer burnout is hardly a way to tell power. I don't remember any local dyno shops taking customers cars out to the alley and seeing how far they can burn out.

If you want to see what new mods can do to your car, dyno it before and after, or take it to the track before and after. Burnouts are for showing off, but back in the early 90s I used to get nasty burnouts in my 83 Celica, which had roughly 95 HP.

UD pullies seemed to help my car, noticed the engine revved smoother but it didnt give me a SOTP gain. i wouldnt pay for a name brand set, my old ones were a cheap ebay brand i got for 40 bucks, alot better deal. worked great! they dont do much. i dont use them now with my supercharger, i need the stock pulley so the SC pulley will fit in it and with the stock crank pulley on, i couldnt used the bigger WP pulley, i never used the alt pulley it made my car charge low.

jhonda said:

after I installed them I can spin them for 125ft and that was down a slight hill. I will post pictures when I get them. Also when in first gear I can stab the throttle at anything above 2500rpms and lay rubber.

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Great! You now have power equivalent to a stock Fox in good condition.

2000xp8 said:

Never heard anyone say that pullies don't work, but if you think underdrive pullies added 105ft to your burnout facing downhill, you are god damn nuts.
If 8rwhp gets you 105ft, how far you think you can do a burnout with an extra 75rwhp? Till the tires fall off?

They are worth a tenth in the quarter, hardly enough to celebrate.

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As much as it pains me to say... 2000xp8 is right on the money.

iwashmycar said:

ya they worked just fine, but my alternator couldnt keep up and god forbid i get stuck in summer traffic!

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Exactly. Two things that i would never consider slowing down at the pulley. Sure, they work, and they're great for a racecar, but i'd never run them on a street car. There's plenty of other ways to free up power.



Oh, and i will add, if you really want to get the absolute best you can get out of a 1/4 mile pass, forget UD pulleys....just pull off your serpentine belt RIGHT before you make the pass...like as you're sitting in the staging lanes and you're next up, hop out and pull off the belt. Your car won't over heat in that short amount of time, and you really don't need charging or power steering for one pass. Stop at the end of your run, put the belt back on and drive back to the pits. You'll free up more power than under drive pulleys ever could, and you'll get whatever gains you'd see with them and probably a tad more. Then you can drive back home knowing that your car is getting plenty of cooling and charging with stock sized pulleys.

I noticed a SOTP increase when I put them in my 92, but had the standard electrical problems. 3G alt on eBay for $85 shipped and all was good. A must for underdriven Foxes. That being said there is no way I am putting them on my Cobra.

Did you do a before or after test? As stated, there is so many variables: Same highway? Fresh, chip-seal, uphill, downhill, etc.

I know in the summer time I wouldn't even in spin in 1st gear from a roll. When winter comes along (harder tires/cooler intake), I can spin 1st easy, second nicely and chirp 3rd.

I'm glad I didn't add a K&N filter and tested the before as summer, and then the K&N in the winter, or the claims that they say would be true

underdrive pulleys dont work