Underdrive vs. Stock diameter pulleys
10-17-2007, 01:08 PM
#1
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Location: Annandale, VA
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Underdrive vs. Stock diameter pulleys
What is the difference between the two? do they both add the same amount of horsepower? does one fit better than the other? do they both bolt right on without modifications? if i were to get one, which one would best be for me.....99 auto max?
10-17-2007, 01:18 PM
#3
Yes I agree. I have one but it was pretty much given to me. It did emphasize something (free'd up maybe 1 hp). It does add an interesting sound to the engine rev. But I have read too many scary posts about them breaking and destroying the bottom end. Don't buy one. Invest in a YPipe, and/ or 00vi conversion.
10-17-2007, 01:47 PM
#4
the difference is the diameter/weight. the stock size does not underdrive your accesories and is supposed to add hp strictly by reducing the weight. the underdrive pulley is supposed to free up hp by underdriving you accesories, which supposedly rob some power, as well as reducing weight.
i'm not sure that either do anything.
i'm not sure that either do anything.
10-17-2007, 03:29 PM
#5
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Yes I agree. I have one but it was pretty much given to me. It did emphasize something (free'd up maybe 1 hp). It does add an interesting sound to the engine rev. But I have read too many scary posts about them breaking and destroying the bottom end. Don't buy one. Invest in a YPipe, and/ or 00vi conversion.
10-17-2007, 03:30 PM
#6
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thnx guys for the info, i was just making sure wut they do, so i guess i will stick to a y-pipe or going with a jet pcm. cause i really need some pick up on my acceleration, i know the pcm will help with that
10-17-2007, 03:32 PM
#8
10-17-2007, 04:34 PM
#11
10-17-2007, 05:03 PM
#13
10-17-2007, 05:11 PM
#15
Believe=placebo effect
Believe all you want, but based on your post, you added the UDP to your car that already had a Fidanza FW on it, and then your car ran smoother and made "your tires scream".
That's what I call
Nothing more than Placebo effect.
The FW is doing 99% of what you're experiencing, with the difference going to the UDP. There's your combination.
Believe all you want, but based on your post, you added the UDP to your car that already had a Fidanza FW on it, and then your car ran smoother and made "your tires scream".
That's what I call
Nothing more than Placebo effect. The FW is doing 99% of what you're experiencing, with the difference going to the UDP. There's your combination.
10-17-2007, 05:23 PM
#16
Uhhh thanks for caring so much. Urr swell, but really. Whatever improvment i noticed im going to have attribute to the udp, since it is the most recent upgrade. Maybe i should of added "more" at the end of my first thread where i said it freed up hp allowing the fw to make the tires scream, but i figured it was obvious with a 5 spd.
Yes the car did idle smoother too thanks
Yes the car did idle smoother too thanks
10-17-2007, 05:50 PM
#20
that i couldnt help you with I dont know if there is a difference, im sure there is though. It will definitely make the car run smoother, google it and read up the comments would b my best bet
10-17-2007, 06:01 PM
#21
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yea good advice, anyone else wanna add anything, or know anything about my previous question?
10-17-2007, 06:09 PM
#22
invest in other mods... however if you do get a lightened pulley, stick with stock size. a big majority of the hp gain (if any) comes from the weight reduction where very little comes from the smaller diameter. this way you are not underdriving your alternator and your ac compressor
10-18-2007, 12:08 PM
#24
UDP does free up power but it is for someone looking to get everything out of there car. I have tested it for my self... me and my buddy have the same year (95) autos. Stock to Stock i was faster by maybe 10 inches. His first mod was udp and he pulled half a car or less on me. So it does free up power.
10-18-2007, 01:28 PM
#28
UDP does free up power but it is for someone looking to get everything out of there car. I have tested it for my self... me and my buddy have the same year (95) autos. Stock to Stock i was faster by maybe 10 inches. His first mod was udp and he pulled half a car or less on me. So it does free up power.
10-18-2007, 01:33 PM
#29
yeah i agree with dblock1 i did have my oem FW shaved and added a udp..w/ypipe, had no traction at all specially in 1rst all the way to the early 3rd gear if had a good launch.. and i was using 235s on my 16" rims. put one in my automagic max and i am not lying dude, it does make a difference but u ve gotta wait for a week or two to get the timing adjusted....
10-18-2007, 02:22 PM
#33
+1 ^ i hate mine. Car came with them since i got it from tilley but he wasnt using the a/c and my a/c sucks with thoes pullies on there. And i know its not the a/c thats bad he installed a new on and i had it charged and everything.
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