My mechanic installed my RVM UDP today. He had no difficulty removing the old pulley and installing the new one. But he did have trouble finding a drive belt that wouldn't squeal. He tried several belts including the Gates K060408 and K060410 recommended by RVM. He ended up using a NAPA 25060407. (NAPA belts are OEM'd from Gates. The equivalent Gates Part Number is K060407.) The belt dimensions are 27/32" x 41-3/8" (21mm x 1050mm).

I just picked up my car so I really haven't had time to check out the UDP yet. I'll post my impressions later.

 

Thanks for posting the drive belt sizes. Will you be dynoing the car anytime soon?

 

I used the 'correct sized' NAPA belts with my UDP. I've had the UDP and belts on for almost a year now and have had no problems whatsoever.

 

Right. I'm not sure if it's an issue with RVP pulleys or whether it was just my Maxima. But the "correct sized" NAPA belts apparently didn't work properly, hence the need to go to a "non-standard sized" belt.

What's important to know is that the Gates K060407 (or NAPA 25060407) is not a normally-stocked item. So it may be helpful to have one around just in case the "correct sized" belt squeals.

 

I don't have plans to dyno it at this point, Nathan.

 

k thanks. I would rather wait for some dyno results before I buy it. Since it's winter up in Canada I'll hold off on it until summer anyways.

I'll be waiting for your impressions.

 

First impressions with the UDP are favorable. The engine is definitely more eager to rev at lower rpms. I'd say that the UDP provides approximately the same power increase as advancing the timing from 15 degrees BTDC to 17 degrees BTDC. And the combination of advancing the timing and adding a UDP is DEFINITELY NOTICEABLE!

 

What RPM range would that "definitely noticeable" increase be within?

Thanks.

 

2500-4000 rpm. After that the Y-pipe takes over.

 

Thanks!

 

How much do those belts cost? The Napa and the Gates?

 

so did u end up using the NAPA 25060407 belt? and did that take away the squeal? b/c i used the gate's belt and i can't seem to get rid of the squeal which is pretty annoyinng... so plz post if the napa belt solved the prob. of squealing thanks

 

After trying several other belt sizes, my mechanic finally installed the NAPA 25060407 belt. And it hasn't squealed so far. But be aware that the packaging on the NAPA belt says the following:

"Supplied for NAPA Distribution Centers by The Gates Rubber Co., Denver, CO 80217."

So I don't think the squealing is an issue of whether you use a Gates belt or a NAPA belt. I think it's an issue of getting the right-sized belt.

 

I found the NAPA belt on-line for around $20.00. I found the Gates belt on-line for around $12.00.

I paid more than $20.00 for my NAPA belt. But it was worth it to me to pay a little extra so that I didn't have to go through the headache of finding the right sized belt by myself.

 

for those part napa 25060407 and gate k060410 are u refering to the p/s or alt/ a/c belt?

so if u can list the p/s part number and alt/ a/c belt used thanks

 

The part numbers indicated above are alt/ac belts. The OEM p/s belt was used.

 

Hrm I am wondering how it is that rvm is selling the UDP for less then half of what other manufacturers are charging and if this is related to the squeeling belt. Has anyone else used this brand of UDP. Its amazing inexpensive and there for attractive but I just can't get over the huge price difference.

 

Yeah. Neither can I !!!

 

funny you'd use this as a comparison and this thread this thread (first to advance timing) has now had timing retarded and can't feel a difference.

sorry, but no dyno = no gains

 

Whether or not you decide to have your timing advanced ain't no skin off of my nose or anyone else's, 2k2wannabe. AFAIC, save your $40.00 and don't get your timing advanced. That way for sure you won't be able to tell if there's a difference.

 

I have to apologize... I wasn't coming after you in particular. I'm just getting tired of reading these 'butt-dyno' threads. If all the 'butt-dyno' mods were correct, I can think of at least 5 that people claim to add "10-15hp" so why aren't cars with intake/UDP/advanced timing/y-pipe (b-pipe, whatever)/exhaust running close to 300hp with just those? One guy was even claiming Redline oil was a performance mod and added hp I mean, come on!

I read here to find out useful information. I've found plenty, but then I've also found plenty of ... well, I'd like a definitive answer to these:

-Advance your timing / turn it back because there's no difference

-Install a UDP / it gives the same gains as advanced timing (explain that in relation to above comment)

-Injen adds 10hp / no it doesn't

-frankencar adds 10hp / no it doesn't / yes it does / it does on "some cars"

-K/N drop-in adds 5hp / no it doesn't

I will get a UDP and Injen and will dyno after. Not going to bother with a dyno before and after (there are enough baseline stock dynos for 6-speeds anyway).

I just wish someone (NOT THE MANUFACTURER) would dyno some of this stuff and see what it REALLY does. I'll contribute to the USEFUL side when I get the two performance mods I and am willing to take a chance on.

...until keving does his write-up on the turbo install... but even that's for a 2k, not a 2k2

 

NP. I like modding my Maxima because I'm obsessive and it gives me something to obsess about. It also "personalizes" the car for me. Whether any of my mods actually increase performance (or decrease it, for that matter), is relatively unimportant. I don't race my car on the track or on the street. And the only way I'll ever dyno it is if someone will do it for free. But hey, that's just me.