fred

iTrader: (2)

and i just cant understand why nissan had to put 3 drive belts for the accessories...and automatic tensioners must be unknown to nissan engineers...anyway just ranting because it took me a lot longer than i wanted it to...

garbury

iTrader: (4)

did the same thing today while changing main oil seal and putting in my asp underdrive pulley. You have too loosen those tensioners pretty far, and that alternator is a tricky one. Took me about 1 hr 15 to do the entire job, how long did it take you?

fred

iTrader: (2)

probably two hours...yeah, on the alternator i had to loosen the other mounting bolt in order to rotate it...

CyMax

iTrader: (5)

2hrs???? Ahhhhh dude it aint that hard. First thing I did with my Max was change out the Alt ( twice, see other posts) and while I was there the belts on both the ac and the alt. 30-45 min to change the belts AND the alt. what were you doing that took so long??? Did I totally mis something?

Mizeree_X

iTrader: (9)

Yeah, I followed the 4dsc writeup for the UDP and it was pretty easy, considering I had never changed belts on a car before. My only issue was one of my tensioner bolts was rusted and snapped when I tried to loosen it. Thankfully I had 2 spares from my parts car.

fred

iTrader: (2)

what took me so long was that all the bolts and nuts on the tensioners were rusted in place... some stuff called 'knock 'er loose' worked miracles, though...then i had to dig around for the floor jack as well, it was buried way in the back corner...like i said, it took way longer thatn i figured it would

CyMax

iTrader: (5)

I guess I should thank the Car Gods that I didn't run into any of that. Hey Mizeree did you install the UDP? How did that go ( other than the belts) do you have any appreciable gains form it? Worth the $$$???

internetautomar

iTrader: (30)

I've still got too put mine on

Maxima-4DSC

iTrader: (1)

wow, did you run into trouble with it ? i changed my belts in 25 min. I changed my pathfinders belts in 15 min. I admit auto tensioners WOULD have been nice but i guess they had their reasons.

garbury

iTrader: (4)

mizeree, it must be nice to have a whole extra set of bolts just sitting around in a parts car.
As for the UDP, there is some power gains, but its not really noticeable. It kind of smoothed out the power band a little more and it made my car somewhat faster. Aaron92SE says it will take .2 seconds off the quarter mile...so it should be worthwhile, just maybe not astounding to the "butt-dyno". Overall the job cost me about $170 including the pulley ($127 shipped), the belts (about 35), and a main oil seal ($8).

Tarzan

I spent 30 minutes replacing the accessory belts for the first time in at least 5 years and most of that was spent to loosen a seized bolt on the alternator with WD40 and pensil torch. Surprized that someone complains about the procedure... And the old belts work fine in my wife's industrial sewing machines

internetautomar

iTrader: (30)

so is it worth $55?
for an automatic though.

Matt93SE

iTrader: (44)

The UDP was one of the most noticeable and impressive mods I've done.. HIGHLY recommended.

you slow **** automatics won't see a huge difference, but it's amazing the difference on the 5 spds.


oh.. and it takes me about 15 min to change a set of belts on a VG or VE.. I dunno what your problems are.

pito11213

So what exactly does the underdrive pulley do?

92SE_Dave

Runs accessories at lower rpms.. less drag on motor... but can lead to decreased alternator and battery life (and what else .. ??). If you have stereo add-ons or other power drainers it is highly unrecommended.

garbury

iTrader: (4)

I haven't noticed an effect on my subwoofer or headlights at all and most people on here didn't notice much either. If you put in a 1000+ watt stereo, then you probably shouldn't go underdrive, but I doubt the common two amp system would cause problems.
Internetautomart, I would say if you can get the thing for $55 dollars you should jump on it. Since you sell the belts it would be quite cheap I would assume. It feels more powerful than when I put a CAI on my vg, but not as much in power gains as the warpspeed y-pipe. I would definately take it for $55.
Matt, where did you feel the power increase? I can't really tell much at all. Is there a possibility I could have tightened the belts too much or something? It feels somewhat faster, but it is so close to where it was before that I can't really tell the difference.

Hectic

iTrader: (20)

classic

Matt93SE

iTrader: (44)

I've got a 2500W system in my car and still have no problems with battery or alternator life. That's a misnomer and isn't a problem unless you spend all of your time in the car with the stereo cranked and the engine at idle.

Even then, my factory alternator still put out 70A at IDLE with the underdrive pulley on... don't worry about the UDP and your electrical system.


benefits? I saw them all throughout the RPM range, but noticed them mostly when accelerating in 3rd gear. before, it would just accelerate throught he band.. now, it pulls the car through even faster. a HUGE gain...

Tarzan

Would it be wise to cast and machine my own pulley?

internetautomar

iTrader: (30)

I already got it shipped with belts for $50 plus had to spend $5 for the seal.
one of these days I'll install it

I'll get a WSP y soon enough. but I need to get my camaro an exhaust first

Matt93SE

iTrader: (44)

probably not. for the cost of machining one, you could buy 5 of them already made..

that is, unless you have a 8x8x4 hunk of aluminum lying around and a lathe.

garbury

iTrader: (4)

Yeah, you like my "classic" contradictions? lol.

Matt- So 3rd gear is where its most relevant? I've only taken 3rd gear to redline twice since I installed it, so maybe I will test that out again.

Tarzan

I can do my own casting and am getting a 9*20" lathe soon. I have lots of scrap aluminum saved somewhere, so making a hunk is not a problem. I was wondering if a UDP is hard to make, sort of if I would need pressure casting equipment or am I safe with simple casting. Seems like it only involves spinning once the casting is complete.

Cliff Clavin

iTrader: (11)

I noticed a big difference with the UDP. I find myself at the redline much faster. I bounced it off the limiter a few times at first. It seems to pull especially well from 3k to the redline. It does seem smoother, too.

Paired up with a Fidanza flywheel, my car revs quick. I think it is worth the money. I got mine used for $100 shipped, then had it resleeved by ASP (no leaks so far). I picked up some Goodyear Gatorback belts from 1992maxman and everything worked out fine.

Tarzan

What are you talking about?

Cliff Clavin

iTrader: (11)

You can send in the ASP underdrive pulley and they will put a metal sleeve over the part where the pulley meets the front seal, so that it won't leak. So far mine hasn't leaked a drop of oil.

SmithAtlanta

Where did you guys buy your UDP's? I was thinking about swapping out when I swap out my moaning power steering pump.

internetautomar

iTrader: (30)

I bought mine used

Cliff Clavin

iTrader: (11)

I bought mine used, too.

If you have a VE, you can get one from www.aspracing.com for $120 (+ shipping?)

If you have a VG, I believe Unorthodox is the company that makes them.

Aaron92SE

iTrader: (128)

I got mine from Jegs or Summit, I can't remember. It was $110 shipped.

But I highly recommend this mod. There are no negative side effects either. The biggest gain will be in throttle response. You've never seen your tach needle move so fast! For me, it was a slight gain in low end power in the butt dyno. When I took it to the track to compare times from the week before (same weather and everything), I shaved 2 tenths in the 1/4 mile and 1 tenth in the 60 foot due to the gain in low end. A tenth in the 60 foot is hard to do for most cars, but when you are doing 2.5x in the 60 and you can't chirp the tires off the line if you tried... it's easy to shave a lot of time of that crappy 60 foot. That's what I was doing when I was stock.