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Differences? Thoughts?


How did it compare to having the larger stock pulley?

Any of you install one without the A/C option?

What is the belt number for no A/C eBay UDP?
What is the belt number for no A/C MPx UDP?

the belt # for the mpx can be found with a search, but i like my udp i'm not sure how much power it gave me but it felt pretty good.

I have the af/x and I can feel a pretty nice difference on acceleration. As for the ebay ones, the belt sizes will probably vary. For the mpx you should call modern to see if they can answer that for you otherwise it might just be trial and error.

Essentially it's the same thing. These ebay companies usually take an existing product and clone it since they can have it manufactured cheaper. Aside from that, it's pretty much the same product.

It's like all the OBX products, they just clone the best products and sell them dirt cheap. Some are not quite as good like the LSD, but the UDP is simple and shouldn't be any different than say and Unorthodox UDP.

^ I agree. Reading both the MPx and eBay review thread of these, noticeable differences are the same, except with the eBay pulley the wallet is heavier afterward....

I doubt the ebay one is made of the same high grade aluminum, not to mention the balance and roundness could be questionable, which could be very bad news.

^ Yeah, I asked about that in the eBay review thread. I always figured weight would play a factor, but I guess it really doesn't matter in this case (so I read). The eBay one I got feels just as sturdy as stock, and my stock one is OLD (160k) and pretty worn / possibly crooked. My mechanic said that even if this quality is slightly less than stock, it'll last just as long as stock, if not more. I'm going to go ahead and trust the eBay one. If I feel the need to upgrade later, I'll get the MPx one, since it has belts and all figured for you. Sometimes, budget building is FTW Derek. Rofl. Even w/ eBay.

My definition of budget is saving patiently for quality parts, and obviously trying to get good deals on them. Many people have a different idea. All I'm saying is that having an imbalance on the crank, however minor, DOES make a difference. They don't design and machine them to balance to a certain tolerance for no reason. There's also the chance of heat warpage in lower quality alloys.

Heck, the MPX pulley is what, $110? Not exactly a second mortgage.

I would just get the MPx pulley. This way you are sure to get the right belt size for you're car without any problems.

I have the MPx underdrive and love it.

OB wrote: All I'm saying is that having an imbalance on the crank, however minor, DOES make a difference.

By that logic alone, the underdrive pulley is a bad choice. There isn't any torsional dampening like the OEM pulley/dampner. The oscillations not cancelled out are prolly worse than a bit of out of balance at the pulley end of the crank. The load placed on the crank from firing, is far more than a tenth of an ounce spinning 2.5" from the centerline of the crank. The UDPs are prolly closer to balance than the stock pulley, as it is made of heavier material, that is farther from the crank centerline.

There is just not enough mass in them to have anymore influence than the factory rotating assy tolerances. If we were spinning it at 12,000 rpm, it may be a little more important, but for the average guy on the street, I doubt it is going to hurt much. If you are using it for race only, then by all means, go with the good stuff. Racing is not for budget minded ppl. A true performance part for this isn't made. Something like Fluid Dampr, or the like that has actual dampening qualities would be the true performance piece. But most neon owners would not shell out $500 for one. Prolly why there aren't any available.

Besides the fact that there are few failures due to UDP's on these engines. There may be some shortened bearing life, but it obviously isn't a huge factor.

Just like what everyone else said, doesn't seem to be much difference. I'm sure you are going to get what you pay for, but I don't see it being enough of a difference to worry about.

I was going to get an ebay one for my 1gn. But I ended up getting an unorthodox for $60. Nice thing about that is it's for a 1gn. Not 56 different cars like ebay says. It tells you exactly what belts to run. It also has step by step instructions guiding you to heat the pulley, and put ice on the crank.

Ebay isn't going to give you that stuff, but for anyone that has done it before, you don't need it.

Well, like Derek said, the MPx is only $129 or so, and it comes with the belts, which is nice. I think someone on here got it with the wrong belts, so there's a small delay, but I know MPx would have straightened that out.

Also, I pinch my money a LOT and I feel as though I'm on extreme budget modding. Only reason I went through with this whole UDP thing is because I landed one free (shipping errors FTW) so it's only cost me the price of two belts (~$25) so to me, it's still worth all that.

ok @ first sorry for hacking this topic.
but didn't feel good about making topic 589 about udp's

can anyone tell me what the difference is between these ... they look sooo different ??

http://neverenoughauto.com/index.php?di ... y_id=59920

http://www.modernperformance.com/underd ... -1959.html

and yeah i know ... the mpx is good soo go buy that one .. but ey .. money trees don't grow here either ...

Adam, how much did you end up paying for that eBay UDP? I'm curious about these.

dutch animal wrote: can anyone tell me what the difference is between these ... they look sooo different ??

neverenoughauto = possible generic picture. There are UDP's available without the accessory drive groove. They will only run the alternator. This may be what they are showing, all the different options/types/applications in one pic for all apps.


modernperformance. = Actual product.

ok so the pic isn't really the pulley ... but if i orderd i'll get one like the MPx one .. but than megan ofcourse ?

am i understandig you correct ?

I really couldn't say what you may actually get. Maybe you could email them to see if they could send you an actual picture?

By a UR pulley I have one and its awesome, not to mention that If I ever have to replece the timing belt again or water pump all I have to do is take the three bolts off and the pulley comes out leaving the center bolt on.

where can i buy that one ... must be shipped to holland ?

you've got me intressted

dutch animal wrote:where can i buy that one ... must be shipped to holland ?

you've got me intressted

Same one I have for the 1gn. Very nice piece.

acr wrote: If I ever have to replece the timing belt again or water pump all I have to do is take the three bolts off and the pulley comes out leaving the center bolt on.

I'm not 100% sure the cover will clear the three ears to come off. I think you still need to pull the hub.

occasional demons wrote:

acr wrote: If I ever have to replece the timing belt again or water pump all I have to do is take the three bolts off and the pulley comes out leaving the center bolt on.

I'm not 100% sure the cover will clear the three ears to come off. I think you still need to pull the hub.

It doesn't. Most people trim the cover some for it to fit.

dutch animal wrote:where can i buy that one ... must be shipped to holland ?

you've got me intressted

I think modern sells it well atleast thats where I got mine from.

http://www.modernperformance.com/unorth ... -1800.html

i think thats the one you mean right ?

its a lot more expensieve than the otherones though

but you guys think this one is the best choice ?

sidepipe87 wrote:Adam, how much did you end up paying for that eBay UDP? I'm curious about these.

It's DEF worth the price dude. I mean, it was damn cheap. Like DAMN cheap. PM if you want

dutch animal wrote:http://www.modernperformance.com/unorth ... -1800.html

i think thats the one you mean right ?

its a lot more expensieve than the otherones though

but you guys think this one is the best choice ?

The Ebay units look exactly like the UR unit. Except there isn't any name engraved into them. They run around $40 ish, plus shipping.

Edit: Dutch Animal, if yours is an '02, it might get a CEL, but IDK if that would apply to export PCM's or not. The brand of UDP will not make any difference with the CEL. (P0300, or any from P0300 to P0304 Misfire code)

mine is a 2001 ... but if i got a CEL ... is there a way of tricking the comp to not throw the code ?

thanks for info btw

You shouldn't have an issue with the '01. And no, there isn't a way that has been 100% foolproof in tricking the PCM. This is mainly an '02 issue tho.

ok thats nice to know

so if i went whit the cheaper one ( megan or ebay ) it will be just fine stuf for the money?

i really dont know why there is such a huge price differents in some stuff .... guess its the name

prolly overall quality. Not saying the cheap thing is bad, but not as good as the MPx or UR one.
It's like the company i work for: we buy in china because it's really, *really* cheap, and for 90% of our customers the parts work satisfactory because they don't need the extreme high quality local companies provide