djslinkyz

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Matt93SE

iTrader: (44)

it's not too hard...

1. jack up car
2. remove right wheel
3. remove all belts
4. remove pulley.
5. install new pulley
6. install new belts.
7. re-mount wheel
8. drop car off jack.
9. drive away happy.

ghostmax

iTrader: (4)

"Step 4) Remove pulley" should be translated struggle with the pulley for about an hour trying to loosen it. Good luck with it.

Matt93SE

iTrader: (44)

Actually, it's not that bad if you have the correct tools.

you can usually rent or borrow a pulley removal tool from your local parts stores for cheap/nothing. makes the job a 5 minute one instead of a 2-hour ordeal. been there, done that, now have a puller of my own in the toolbox!

mykizism

do pully's really free up a lot of hp ?

any one had experinces with it?
make car feel any faster or anything?

ghostmax

iTrader: (4)

Getting the pulley bolt off is the hard part, not the pulley itself. Also Courtesy gave me the wrong AC belt which I had to pay for. At least I have credit there.

I notice a big increase in low-end, probably would be better if I had a CAI instead of a popcharger. At first, there wasn't much difference though. Most of the hp came after the ECU readjusted. It's definitely a good mod though, worth the money if you install it yourself. But if you get someone to do it for you, then you're spending at least $300. In that case, I'd get a y-pipe, which is my next mod.

Matt93SE

iTrader: (44)

Yes, they make a big difference.. in this case, the largest difference is from the weight savings.. your stock pulley is about 13lb I think.. the UR pulley weighs like 3. it'll let the engine rev MUCH easier than before..

think of trying to spin in circles with a 20ft steel pole that weighs 80lb on your shoulders.. now take that 20ft pole and make it out of aluminum.. it now weighs 15lb.. try and spin around now.. see how much easier it is?

that's the best analogy I can think of.

flyry110

i was reading in SCC about the udp mod, they said that the weight isn't what makes teh most difference, it's the diameter of the pulley. while there may be a little bit of gain in 1st gear due to weight, that gain decreases every time you shift. This is my next mod along with all the other stuff i have planned. I'm going to buy an ASP UDP. I'll let ya know how it turns out.

mykizism

oh yah its smaller too.. so i dunno
i have one coming in the mail soon, just wanted to see what you guys thought of it.

adamlacey

iTrader: (1)

given the fact the diameter is larger, that means more revolutions of the engine turn the pulley less... meaning it takes more power to spin the pulley....

so while you would get an increase in engine performance, all your accessories.. A/C, etc. wouldnt work as well...

Anyone have any experience with this.. or does the UDP only give u benefits, and no losses?

flyry110

i've posted questions on this a bunch of times, and i've heard nothing but good things about the udp. at least on the VE. the diameter of the udp is actually smaller. Imagine a bike, your harmonic balancer (pulley) is like the front sprockets of a bike. the smaller the more mechanical advantage you have. take that same pole example, but swing a 10 foot pole and swing an 8 foot pole.

Matt93SE

iTrader: (44)

In the case of the MAx pulley, it's more the weight savings than the smaller diameter. There are lightened pulleys and there are U-D pulleys. this one is lightened a BUNCH, and slightly underdriven. (check the specs on the pulley for more info. it's not much smaller than the OEM pulley but 1/4 the weight).

the reason they benefit our cars is due to a reduction in rotating weight.. moment of intertia if you want to get into the technical physics.. It takes a lot less power to accelerate a 3lb pulley from 700 to 7000rpm than it does for a 15lb pulley. THUS, it frees up horsepower that can be used to turn the engine easier.
and yes, you'll really only see the benefits in the first couple gears. after that, you're not changing the rpm fast enough that it'll make much of a difference.
this is where true UDPs come into play... on a UDP, they're slightly lighter just because they're smaller, but they free up HP by slowing down other components- like your A/C, alternator, power steering pump, water pump.. the faster the engine turns, the more power lost through those devices... so when you turn them slower, you feed them less power, putting more to the ground.

flyry110

i am ordering the asp udp cause i'm not gonna do a custom blower (phil is angry with me) from what i understand they are more a udp than a lightened pulley. does anyone know where i can get alternator/ac pulleys too?

djslinkyz

thanks for all the help guys

MaDMaX024

what are these lightened pulleys you speak of? i cant afford to lose any power from my altinator, actually i'm looking at a bigger altinator too (bad experiance the other night ...battery could be the problem though).
thanks

djslinkyz

i don't think they make lighter pulleys for us except for the UDP. i know that the sentra and 300zx have complete pulley sets.

Matt93SE

iTrader: (44)

the VG has a lightened pulley, and the VE has a UDP from what I udnerstand... here's the UR lightened pulley that kaleb helped develop for the VGs..

http://www.courtesyparts.com/cgi-bin...t_Code=J30-UDP


for VEs, I'm not sure what's out there, but I think only the UDP.

MaDMaX024

could i just have my stock pulleys lightened?

flyry110

i wonder how similiar Z alternators and stuff are to the max's. If i could buy a lightened pulley set for them, and get em to fit on the max. . . . i know i'm getting the UDP at least.

hirbie

From the Courtesy Nissan page... Manufactured by Unorthodox Racing, this 1.45lb (stock is 8.35lbs) crankshaft pulley will free up horsepower robbed by the heavy rotational mass of your stock pulley, and by reducing the rotational speed of the accessories, will allow your engine to rev much faster. It looks like it does both: lighten rotational weight and slow the accessories. VG only, though.

-hirbie

adamlacey

iTrader: (1)

well somebody out there has this thing!

Can anybody tell us how the accessories perform with a UDP installed? Any probs?

flyry110

i'm pretty sure all you do is remove the belts, remove the bolt, and use a harmonic balancer puller and pull the fawker off. if that doesn't work you could always resort to a hammer. that's how i normally take em off not on my car of course!