I'm just wondering if anyone is using a Cosmo Racing UDP (http://www.cosmoracing.com/productin...d=199&pid=1324) and what their experiences are with it. Its so cheap at $53 and I can get it installed for around $100. Has anyone run into any issues with running the UDPs? Also, I was looking to find out what belts I may need to buy/replace.

 

I stayed with the tried and true Unorthodox Racing pulley. I opted for the light weight pulley stock size, didn't underdrive. IMO I wouldn't take any chances with the pulley, it's not like an intake, this has to move with the engine, I think quality is key.

 

I bought one and have it sitting in the garage with the new belt, just havent put it on yet. They come with instructions and it tells you what belt.

 

Wow thats cheap. I have their intake, pretty much identical to injen. Let us know how it goes redls1.

 

How much did the belt run ya?

 

Less than $15 for a gates.

 

I'd like to know the difference in diameter to the stock pulley...

 

I couldnt find it and wont know till I pull it off, you could ask the company. I thought they said 10-13% underdrive.

 

I wouldn't go with underdrive.

Read.

Joshua

 

I had one on my other car and never had a problem. Actually I only keep my car a few years anyhow and by then it willl be gone.

 

Their main argument is about balancing. The VQ35DE is internally balanced, so there really isn't anything to worry about IMO. I just ordered one for $68.50 shipped. I've got a baseline dyno right now. I am a cheap SOB, so I'm not sure if I'll get a post pulley dyno done...

 

I got the pulley today. It appears to be of good quality. Some of the interesting details is it says it is a UDP, but only requires one new belt, where the Unorthodox Racing pulley requires 3 belts. The belt to get is a Gates K040300 (30.75" or 780MM). There is a place local that should have them, unless someone can recommend a place to get one online cheap.

 

I would emagine that it is only underdriving one belt and the drive for the other 2 stays the same. Looks like a good product, can't wait for a review.

 

I figured out why there is only one belt replaced. There appears to be 2 different groves for belts with different diameters and the only belt that is under driven is the Power Steering Belt. See the attached pictures. I included one with a CD for size comparison.

 

Interesting. I just found a Cosmo Racing pulley on eBay (although their website in post #1 is cheaper) and it claims 5 hp from the pulley.

See below:

http://cgi.ebay.com/ebaymotors/Racin...QQcmdZViewItem

 

Install date set for Wednesday, November 7th. The local shop is going to charge me $105 + tax to install it. I have all new belts, so I'll just chalk this up as maintenance.

 

Negligible. I'd still like to see your butt dyno reaction though. Sometimes even low HP can give you a kick in the torque dept.

Joshua

 

Might try and finally put mine on tomorrow.

 

I have the Cosmo pulley on. The original PS belt works fine. I had to use an 1/2 inch torque bar and crank the engine to loosen the big bolt of the pulley. I did not like the super tight fit of the pulley so I use 400 grit sand paper inside the hub of the pulley. If I remember I measured the pulleys at 20% underdrive.

I reused the old oil seal. I only had 18K miles on the car.

I read on some very old UDP post that oil could eventually run along the key on the crankshaft and drip. It could have been bad installs but not knowing the COSMO UDP, I put some silicone on the back of the certer bolt so the bolt seals tight against the pulley. No leaks to report.

The power gain is from the engine accelerating a lighter pulley. Power normally used to create kinetic energy, is now available. http://www.nissanperformancemag.com/...r02/altima_ur/ got 3-6.5hp on a dyno.

If you primarily do stop and go, I would say no underdrive. I do notice the blower fan speeding up when I step on the throttle. I cannot tell if A/C performance is any different at idle. Engine seems to accelerate faster to redline in first gear. Happy so far.

 

All done. I don't have any pictures since they were so backed up I had to drop the Maxima and pick it up several hours later.

I love the Cosmo UDP. Man does it rev quick. I feel like I can get in and out of traffic like nobody's business now. Very pleased.

 

congrats... .. take your ride to the track now and put down some times... 14.0 would be nice 13.9 would be better

 

Surprised more people haven't done this mod. $68.50 plus $15 on a belt. Dirt cheap and worth every penny. I had them replace the serpentine belt while they were at it....56k miles is overdue I think...

 

Good job , now I wish I would just get around to doing mine.

 

I've been running the Unorthodox UDP for about 5 months now and have had no problems with A/C or power steering (*knocks on wood) which are the normal concerns people have with installing them, and when I put it on, I didn't notice much horsepower gain, but torque in 1st and 2nd gear was definitely "feelable." The intake plus pulley is a good combo because one will help more mid to high range, and the pulley does more for the low end. Now if I could just figure out what to do about exhaust...

 

From what I remember keep stock mufflers, get rid of midsection. Cats and manifolds are the most restrictive. I sure someone will correct me if Im wrong. You could change the entire system but would gain little compared to other particulars.

 

DUESKI made a sticky on how to install the Pulley your self.

EASY AND DIRT CHEAP

Kamski

 

I did one on my 350z I had and kinda know what to do , just havent had the initiative to do it.

 

Why is madmik's pulley "drilled" and hilbe's is "solid" if madmik's is from Cosmo as well? (look at madmik's cardomain http://memimage.cardomain.net/member...2248073_47.jpg)

Sorry for bringing this back up, but the entire subject of an UDP has been making me research it a lot before I MAY purchase it.

 

Just purchase it to say you did, leave no stone unturned. That's what I did. I didn't really see a gain, nor expect one, but hey, it might be there.

 

Do YOU have the Cosmo pulley as well? Mileage you've put on it? Any problems that you have run into with this?
___

I'm watching Ultraviolet and your avatar looks like her, Milla Jovovich

 

I don't have that brand, but unless someone has had a serious problem, (i.e. 4th gen timing ring issue using 5th gen pullies) you should be fine. Yours (ours) do not have to modify said timing ring, so you should be fine.

 

But what about the whole "harmonic dampener" thing?

 

ya what ever happend with that? I havent herd anything bad thus far about the UDP from anyone running it. I guess its not really an issue.

 

It’s internal on these engines, so it’s a non – issue. The VQ is balanced internally.

 

K, so that's what that meant!

Naice!

 

nmexmax im guessing your a mech of some sort? you seem to know a **** load about our cars lol. props to you.

 

Nope, I just have too much time on my hands.

 

I was reading the service manual and it states that there is a special tool required to set the tensioner properly. Is this true? How do you know how tight the tensioner should be?

 

Feel the belt afterwards. Better loose than too tight at first. if you hear squeels then tighten. You do not want to overtighten as you will damage bearings. the tensioner bolt should be tight (actual bolt on tensioner).

 

Cool thanks. I might replace my belts next weekend and while I'm at it I will replace the pulley as well.