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Underdrive Pulley

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Old Jan 23, 2004 | 12:52 PM
  #1  
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Underdrive Pulley

What exactly does this do? People are telling me to get one, and theyre only 189 on custommaxim.com, so i was thinking if theyre cheap and give good gains, i might look into it. But i wanna know what it does first haha.
Old Jan 23, 2004 | 01:03 PM
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Originally Posted by MaxGR97
What exactly does this do? People are telling me to get one, and theyre only 189 on custommaxim.com, so i was thinking if theyre cheap and give good gains, i might look into it. But i wanna know what it does first haha.
Doesn't it say what it does on the web site?

It makes the engine have an easier load = It makes you car faster. I want to get one of these in another month or 2.

Tough install compared to other mods though.
Old Jan 23, 2004 | 01:06 PM
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That $189 would be better spent on a Y-pipe if you dont already have one.
Old Jan 23, 2004 | 01:08 PM
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I already have a y pipe. But ya i tried reading it but it didnt really make much sense, sorry
Old Jan 23, 2004 | 01:13 PM
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Originally Posted by mzmtg
That $189 would be better spent on a Y-pipe if you dont already have one.
I agree, I say to get intake / y-pipe / catback / suspension in the beginning stage which i'm actually still in.

I'd say that step 2 has things like body kits / CF hood / pulley

Directly from custommaxima.com
Power Gains

Unorthodox Racing pulleys can provide gains of 5 to 12 HP and 4 to 8 ft.-lbs. on normally aspirated engines and 8 to 16 HP and 18 ft.-lbs. on forced induction engines. These are average gains. Gains as high as 37 HP and 45 ft.-lbs. have been realized on modified forced induction engines. These gains are obtained in two ways.
First, and most important, is the weight lose. An average of 2.7 HP is gained from every pound lost off the crank shaft. 85% of the gains are from weight loss. The rest of the gains are from underdriving which accounts for about 15% of the total gains.


I think a person should know, and understand how their mods work.
Old Jan 23, 2004 | 01:29 PM
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I already have a y pipe and intake. Im getting catback and lowering springs. THEN im THINKING of a pulley, but not sure
Old Jan 23, 2004 | 01:31 PM
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Its a very tough install. I've been working on getting my PS belt on for over a week.
Old Jan 23, 2004 | 02:14 PM
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Originally Posted by broaner22
Its a very tough install. I've been working on getting my PS belt on for over a week.
Damn!

Changing both belts only took me about an hour....while drinking beer and shooting the **** with my friend.
Old Jan 23, 2004 | 06:10 PM
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i have an UR UPD i may be selling soon.. if my expenses for fixing my front end get too big..

i bought it used.. less than 10k on it.. looks to be in great shape..i havnt had time to put it in
Old Jan 23, 2004 | 06:48 PM
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has anyone ever felt the gains or does the engine rev noticeably faster?
Old Jan 23, 2004 | 09:52 PM
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I want to get that soon... Looks like a hard install though.. :X
Old Jan 23, 2004 | 10:10 PM
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I dont think its worth it.. Going to help so little does it make the engine last longer or less?
Old Jan 24, 2004 | 02:18 AM
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Max Noob PM me I'm interested in buy the UDP.
Old Jan 24, 2004 | 06:41 AM
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it def does rev the car easier, but not worth over 150, i think there are group deals going on for under 100
Old Jan 24, 2004 | 07:08 AM
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I'd prbly wait for a GD. However, guys you gotta understand that it does increase power. Sometimes you buy little things such as this or a straight pipe.. in which it will give you the advantage of everyone else on the .org... (Supposing that your race)
Old Jan 24, 2004 | 08:37 AM
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mzmtg, I have stripped the tensioner adjustement bolt. So it took so long because I had to find a replacement. If I did it again I'm sure I could do pulley and belt in 2 hours.
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