what should i expect from an udp is it worth putting one my car. thanks for your input

 

From what I hear, the gains are noticable. Will have to see when I buy myself one soon.

 

Definitely not the first mod to do.
http://maxmods.dyndns.org/index.php?...erdrivePulleys

 

y could this be your first mod? i have it and i fel that it helped me out when i run people. i think it helps my car rev faster in the higher gears

 

I have the ur udp and i think it's complete garbage. I have a brand new o.e.m nissan altenator and my light's and ac dim much much more than I ever thought they would. I bet I loose around 30 percent lights and ac, or heater at idle. Made my car kind of touchy and jerky and I saw no gains what so ever at the drag strip. Maybe it's cause my car has auto climate, heated seats, all the electrical options that it hit me so bad. But whatever the cause I hate it. Makes my car feel cheap and broken to me. I will be swapping the stock pulley on this weekend. For Sale.

 

How much? Unorthodox udp right?

 

Unorthodox also makes a lightened SC (Super Charger) pulley. It's lighter than stock but the same size as stock. It states that 85% of the power gains are from lightening and only 15% from under-driving, so this may be an alternative.

It's called a supercharger pulley, not because you need a supercharger or anything to use it but because you wouldn't want to underdrive a supercharger. So it's lighter but full size.

 

A aftermarket udp for a maxima only gives you a couple horsepower, but for my friends Grand Am Gt it gave him like 25-30 hp. If we wanted that much horspower for our maxima than we'd have to get like a ecu upgrade or maybe headers but there both expensive, and more than $200

 

I don't know....don't think anyone has dynoed b4 and after with just a udp....don't think it gives much top end power, just soem low end....so it's only useful getting out of the hole or a low end pull....revs cleaner fer sher though! something I definetly noticed as soon as I installed mine...!

 

yeah, it revs a little bit nicer. it starts nicer to because of the lighter weight. As far a horsepower, I would say that it's not noticable. As far as the dimming of the lights at idle, make sure that your alternator belt is adjusted properly. I had mine too tight at first and all the lights dimmed out. I took it back to the guy who did the install, re adjusted the belt, and now all is fine. I put in a voltmeter also just to make sure.
btw, I've got all the elect. goodies as well.
auto climate control, heated seats, etc, etc. Mine is installed in a standard with just a stillen pop charger.

 

You have a link? Thanks!!!

 

my buddy has one oh his poostang (v6) and i helped out a little but now the temp sits higher and the lights are a lot dimmer

 

I have it on my car and as soon as I put the car seemed to rev quicker, it is noticable. I have no problem with the lights either.

 

It's so wierd how it vary's so much between cars. I bought a brand new o.e.m altenator thinking that would help. Tightned belts to specs. Still no good. It's the biggest regret I've had to date with my car. Makes it feel broken and cheap to me. Oh well. I would check out the super charger pulley but I got no results in but dyno or drag strip, so.... stock one goes on this fri.

 

That's funny, because the part of the pulley for the Alt, and AC is the same diameter as stock. Only the inner pulley for the power steering is smaller, resulting in a little more "feel" of the road. The pulley doesn't affect the Alt or AC at all. The reason that there are gains from this pulley is becase it is 1/4 the weight of the stock one. I have had mine for a year now, and never had a problem. I highly recommend this mod, aspecially for Automagic owners. It helps spool the engine faster out of the hole. I can't tell you how much hp it gives, I would estimate probably 3-5, but it is the speed at which you can get through first gear that makes all the difference. I am just wondering what you did wrong to yours.

 

I remember a thread giving the replacement belt specs. Where is? Or what size belts?

 

http://unorthodoxracing.com/cgi-bin/...Code=121001012


Lighter AND you get to use the stock belt size.

 

Don't know all I can tell you is that me and my best friend both have 5spd max's. Mine a 95, his a 98 and both have ur pulley's. I installed mine. He had his professionaly installed. And we both got Identical results. I have personaly read at least 20 posts where people have complained of dimming. It's a proven fact it lower your alt out put. There is even a link showing out put befor and after.

 

Here's that link. http://www.motorvate.ca/mvp.php/521



Intro
A common modification is an UDP (under drive pulley) on the crankshaft. The typical UDP is about 20% smaller in diameter and much lighter. They reduce the speed of the accessories (alternator, air conditioning compressor and the power steering pump in the example of the Maxima) This accounts for about 25% of the total gain.

Most of the HP gain (about 75%) is due to the UDP being lighter. The factory drive pulley is about 5 pounds, and the aftermarket is typically less than 1.6 pounds.

The good: The total gain is about 5-8 HP at the wheels.
The bad: Your air conditioning and alternator may not work as well at low RPM.

 

So just get the lighter one, not the underdrive and get most of the benefits without any of the possible headaches.

http://unorthodoxracing.com/cgi-bin/...Code=121001012

 

Thanks for the good tip. I have the jwt ecu on the car and most of the parts needed to put on the manifold, so that's what's next. Maybe after that.

 

That's an option, but how much heavier is the sc compaired to the under drive? How much of a diff in gains? I checked their site but they don't mention weight at all.