Those who have an UDP, did you install yourself or did you have a shop do it? Can the nissan dealer or a shop like pep boys do it or am I taking a risk?

 

It wil be around 150 to install it at a shop

 

I've seen as low as 60$....

I wouldn't take it to Nissan to install.

 

Why do you say that?

I was actually leaning towards them.

 

They have high rates here in IL
The price qouted was from a local performance shop. They gave me an awesome deal before for my Falken tires and installation with no tax charged. I would imagine that they would provide me with a good price to install the UDP.........guess not though

 

I got a quote, same price as you, but it included the Pulley

But pulleys are and never show any gain in 1/4 or dynos, and that's my interest.

Nissan frowns at most any aftermarket part.

Get a haynes or chilton, and use it, they're pretty informative.

 

+1

.......................

 

I installed this mod my myself and it took about an hour to do. I also have had this on my car for about five years with no trouble what so ever.

 

ha ! look a nissan mechanic will do it, get all the belts you need. nissan shops charger anywhere from 55- 65 dollars an hour just guessing, its a 30 minute job. no worries.

 

It's a good mod for throttle response, not going to show any HP gains on a dyno though. RPM's will get up there faster there. But if you are running a powerful system it might make your car stall after going fast, downshifting, clutch, brake, stall... after the first day of use, and your system is on.

I have the UR UDP, and it's a good mod IMO, I like the throttle response.

 

Every proponent of the UDP says the same thing but it's always a contradiction. How in the world can the RPM's possibly rise faster if you guy's admit there's no HP gain? I want everyone to think about that for a second.

Bottom line is this...if it doesn't show up on a dyno or at the track it's not there.

 

www.motorstorm.com $109

 

Engine spins faster due to lighter pulley weight.

 

Like i keep telling people, the theory is sound, no doubt. But so is removing 15 lbs of weight from your car. In either case, the difference in performance is so minimal it's been proven over and over again to be negligible. In other words, if a car is faster than you, it would've been faster than yours whether you have an UDP or not. Ditto that if the car is slower than yours.

Once again...and this is just my opinion...

 

Yeah, it all depends on the mods, on the other car, obviously. UDP isn't a big mod, it just gives you better throttle response. That's it. The RPM's get up there faster now than before, that's what I noticed. It did what I expected it to do.

 

If the RPM's go up faster then you're suggesting there is a HP gain. There's no way around it. That's contradiction #1.

You also say you can feel the difference from the seat of your pants. That's contradiction #2 because last i checked, a gain you could feel on your butt-dyno was substantial, i.e. more than a few HP. So which is it?



History teaches us that the UDP does nothing for acceleration or power.

 

Thats not neccessarily true, if the engine has to rotate less mass, then the same amount of power it had before can rotate the now smaller mass more quickly. It's quite simple, I'm not saying this is THE mod that will make or break your car, but it does make sense that with less mass to rotate, the engine could spin up faster.

 

I understand the theory; you're preaching to the choir. Perhaps you are not familiar with what the word negligible means:

Over, and out...

 

I can agree with this.

However, if you need new belts already (like me) and you dont mind spending an extra 80-100 bucks to get another complimentary mod, then this wouldnt be a bad idea.

Most of the mods people get are quite "negligible" as is anyways (intake, exaust, test pipes, high flow cats, ground kits, etc.) All these mods provide very little gains, BUT they are nice too have, wether it be because they change the sound, throttle response or whatever it may be, in some cases extra power (~1-10 hp). Regardless its all what YOU want to do.

If you only wanted to mod your car for more HP, then most of you would be going towards the REAL hp boosters like turbo, blower, or nitrous. You wouldnt be wasting your time with intakes or small efficiency mods. Of course dont get me wrong most of these small mods like exaust and intake make a big difference when you go boosted, but otherwise they are all pretty useless....unless you just wana squeez out every last little horsepower...but regardless they are all quite small gains untill put together...

Regardless its all what you wana do...

 

I'm not suggesting anything, I'm just giving my feedback. I'm not here breaking it down to anyone. No #1, #2 with me. No need for it. I'm no mechanic and I'm just speaking on experience with owning a UDP. That's all.

Butt-dyno? Nice attempt to flame though.

 

I have a UDP and it seems really loud to me. It sounds almost like it's sucking in air like an intake when it spins. Anyone else notice that? Also, now that it's winter out it sounds like it's struggling a little when the car is idling. Is there any way to quiet it down?

 

Not to pick a fight, but can someone then explain how GregP here dynoed a 9 whp gain with a UDP on his 2002?

http://www.greghome.com/Greg%27s%20G...xSE/2K2UDP.htm

Just trying to learn more, since this is so often (heatedly) debated, so constructive responses are appreciated. And yes, I've done the searches, I just thought this piece of evidence here was worth bringing up for discussion's sake.

 

I wasn't trying flame. If you didn't get on a dyno to verify the gains you're relying on your "butt-dyno".

 

Ahh ok. Cool.

 

Good post, and I dunno, maybe cause it's a 3.5? It might give a little hp, but I haven't saw any #'s to back it up.

 

Until there are other dyno's with other cars to support this i will dismiss this as anomalous for now.

 

Unlikely, Fezzik dynoed his 2002 with y-pipe, UDP, Injen, at a peak of 211 whp so I can't imagine 9 whp of that being attributed to the UDP alone.... MadMaxNH dynoed a peak 206 with intake and UDP, so obviously, he didn't get much either... like Nismology said, it could have just been an anomaly, which is why I brought it up.

http://forums.maxima.org/showthread.php?t=334070

http://forums.maxima.org/showthread.php?t=406402

Buuuut.... back to 4th Gens.... although I think this discussion applies across the board in the UDP case...

 

If that's your argument, I'd be interested to hear what history has to say about flywheels, clutches, lightweight wheels, carbon fiber hoods/trunks, removal of spare tires, short throw shifters, etc. Are they useless as well?

 

Like i've said before, look up what the word negligible means and you'll understand my point.

As far as 4th generation maximas are concerned, they do nothing for acceleration and power. Anyone that says they felt a change is a damned liar because if it doesn't show up on the dyno or at the track, it's not there. If you want to keep believing whatever it is that helps you justify your purchase, so be it.

If you have ANY concept of physics and rotating bodies and how their dimensions can affect their behavior relative to their mass, then you will understand why a lightened flywheel and lightweight wheels are > the UDP as far as reducing inertia is concerned. You will also understand why an UDP allows the motor to rev up and down more quickly while in NEUTRAL but doesn't do squat while in gear.

 

Only reason I got the UDP was to complete the 'off the belt' cycle. I.e removed A/C and power steering so why not just throw an UDP on there for the hell of it. One short belt.

 

Since I'm two classes away from my bachelors degree in physics and I also tutor both the 100 and 200 level physics classes, I'd say that I do have "ANY concept" of the subject matter. And most of what i've learned over the last four years is that the neglible can end up making a big difference.

The truth is that I'm just being the devils advocate here. And i don't think anyone has a legit argument as to whether or not the udp makes any difference. I've got the motorstorm udp and haven't noticed a difference but I guarantee it's doing something.

 

Practical gains > theoretical gains. That's all i gotta say...

 

Whatever helps you sleep at night.

 

iv also noticed that when idling after a udp install the voltage is no longer 14vs its 13without the system up and almost down to 12 when its on. is a negligible power increase worth the lose in voltage? longterm problems?

im still decidin whether to keep mine on or not. in conjunction with my fidanza flywheel i DID notice (on the butt dyno)i slightly faster rev, but thats about it. i think id rather have a car that can power its own electronics without any problems, than one with i tad quicker rev.