MPx Underdrive pulley

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MPx Underdrive pulley

Post by ChrisRT » Wed Sep 20, 2006 11:10 am

In a few words. AWESOME.

The car idles smoother, feels stronger, revs faster, and as far as I can tell, is getting better gas mileage.

The "feel" is comprobable to the TB change. You can definitly tell its there. Pulls harder towards redline as well!

I recommend anyone with a 2g + Neon to get a UDP. The stock pulley is FRICKEN HUGE!!! I couldn't believe the size of it compared to the MPx.

All in all, i'm very happy about it!
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Post by 01NeOnEs » Wed Sep 20, 2006 12:35 pm

i also have the same pulley and it was one of the better investments i ever made.
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Post by LC_Neon » Wed Sep 20, 2006 7:18 pm

+1 !!! UR UDP here
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Post by BlackRoseRacing » Wed Sep 20, 2006 8:41 pm

I told numerous people, the UDP is the best bang for the buck....forget the 60mm for now, use the UDP....
And as of 1hr ago....anyone running a system does NOT need to get a special overdrive pulley. Just grab a pulley off a PT cruiser and your done. The PT uses a 100amp alternator with an oversized pulley compared to the neon. The PT pulley can be had cheap at your local boneyards :wink:
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Post by scneonchic » Wed Sep 20, 2006 9:33 pm

^thanks for the tip about the pt pulley. I need one ASAP :)

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Post by skuttler » Thu Sep 21, 2006 1:51 am

In a few words. AWESOME.
I just installed mine last week and in 6 words, magnificent. Right around 4000 rpm There is a slight vibration that I didn't used to have but my car definetely pulls harder in the first 2 gears. My gas mileage actually decreased from 27 to 24 because I can't stop stomping on it through the first 2 gears. I'm starting to calm down now so we'll see if I get better mileage on this next tank.
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Post by OB » Thu Sep 21, 2006 2:07 am

^that vibration might not be so good. Are u sure the bolts are all torqued down to factory spec? I never heard anyone say they felt any vibration after installing the smaller udp.
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Post by phenomeneon21 » Thu Sep 21, 2006 3:27 am

I'd like to get a UDP, but damn the '02's for throwing a misfire code...
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Post by Dutch_Neon » Thu Sep 21, 2006 7:04 am

Can someone briefly explain to me what a UDP is and what this pulley does? Thx!

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Post by BlackRoseRacing » Thu Sep 21, 2006 7:09 am

UDP - Under Drive Pulley
It is a light weight pulley that slowes the accesories down to help free up some horsepower.

As for the vibration at 4k rpm, its more harmonics than vibration. The stock pulley has a vibration dampner in it that is designed to get rid of the harmonic vibrations at high rpms. The UDP does not do that...
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Post by Dutch_Neon » Thu Sep 21, 2006 7:29 am

What do you mean by: it slows the accesories down?

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Post by epatchett82 » Thu Sep 21, 2006 1:18 pm

It spins the alt. and ps at a slower rpm as compared to stock. Less drag=more usable HP
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Post by CA180 » Thu Sep 21, 2006 3:12 pm

correct me if i'm wrong, but wouldnt a larger alt pulley slow it down even more?
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Post by quicksilvr » Thu Sep 21, 2006 4:22 pm

CA180 wrote:correct me if i'm wrong, but wouldnt a larger alt pulley slow it down even more?

Yes....if you're wanting to offset the smaller UDP on the crank, you'd want to also decrease the size of the pulley on the alternator. So if what BRR said is actually correct, and the PT pulley is "oversized" then I would definately not use one of those. If he said it backwards, and meant to say that the pulley is undersized, then a PT pulley would be useful.



And I also love me MPx udp. Had it on and off a couple times now too, and it has held up great. Definately recommend it! 8)
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Post by BlackRoseRacing » Thu Sep 21, 2006 4:43 pm

^^^
Wouldn't the larger pulley spin faster at its center Vs a smaller pulley?
Maybe I did get this backwards then..... :?
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Post by neonpla » Thu Sep 21, 2006 6:27 pm

adam k. over on neons.org still has alot of odp's left that he use to produce if anyone wants one of those just pm him over there.
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Post by glasswars » Thu Sep 28, 2006 8:34 am

When you get the UDP, what else do you have to get? Just a new belt? Is it the timing belt?
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Post by Mr Josh Zombie » Thu Sep 28, 2006 8:39 am

*thinks* so... i've been considering more basic engine mods lately, just for the hell of it... and just how hard is this to change out?

I couldn't find ANYTHING about it in my neons manuel thing... *shrugs*
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Post by ChrisRT » Thu Sep 28, 2006 10:22 am

glasswars wrote:When you get the UDP, what else do you have to get? Just a new belt? Is it the timing belt?
No, you get a power steering and alt. belt, as well as an A/C belt, if your car has A/C.
Opi wrote:*thinks* so... i've been considering more basic engine mods lately, just for the hell of it... and just how hard is this to change out?

I couldn't find ANYTHING about it in my neons manuel thing... *shrugs*
just curious
Its not hard, but, i had some "dealer dollars" from using my Dodge credit card, so I used them towards a service. It cost about 1.5 hours labor(120 bucks) to have the pulley installed.
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Post by CA180 » Tue Oct 10, 2006 12:44 pm

+1 For MPx UDP.... Nice piece
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Post by LCPLPunk » Fri Oct 13, 2006 1:32 pm

oh man...i may ahve to get one of these, but i dunno if i want to lose any AC power..
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Post by Adam K. » Fri Oct 13, 2006 2:52 pm

An Under Drive pulley would be the first thing I would do on the Neon.

I have been running a PT Alternator on my 2001 R/T for years without an issue. You have to understand that running a PT alternator is not going to do anything for you at idle or low RPM’s. Yes the amperage output is higher but that is just the max it can output. At idle the stock 83amp Neon, 100amp and 120amp PT Alternators will pretty much output the same amount. This is why I created the overdrive pulley.

The average UDP spins your accessories about 30% slower. So the Alternator is spinning slower then recommended and voltage drops significantly. I have even seen some that dropped below 12volts. Stock you should be seeing 14+ volts at idle. If you don’t spend a lot of time at red lights or bumper to bumper traffic most people feel its really not an issue on most cars but some will start getting check battery lights because the alternator can’t output enough at idle to charge the battery. Another thing to think about is since the voltage drops I could see that the spark is weaker and doesn’t burn the fuel as well as it would with a higher voltage.

As for the A/C. The Compressor Clutch will just engage a little longer to build up the pressure. The UDP actually helps greatly driving when running A/C. The car almost feels like you are not running A/C. The only draw back again is that since the voltage drop at idle the fan is not as powerful as it should.

Argue with me or not but I do believe any UDP is a great thing but under driving the Alternator is not a good thing.

And the Alternator Pulley has to be smaller to reverse what the UDP does. Mine is 25% smaller.

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Post by CA180 » Fri Oct 13, 2006 4:32 pm

I really like mine,, the only thing is that I went my the parts numbers listed for the belts and they were WAY too big... The alternator belt was too big by an inch or more, so I got a smaller one... The a/c p/s belt fit, but the tensioner would at the edge of bottoming out... so I got a shorter belt, I think it was 49 1/2 inches.
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Post by 03NEON » Fri Oct 13, 2006 6:44 pm

is there any underdrive pulley thats better then the others and if i get one with out belts were can i get the belts
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Post by BlackRoseRacing » Fri Oct 13, 2006 6:46 pm

Adam K...
Wouldn't a larger pulley on the alternator allow it to spin faster since it takes less rotation on the outside diameter to spin the middle faster?
I noticed the PT alternator has a bigger pulley than the neon does, and I figured UDP or not, the alternator would be spinning faster....
Kinda like if I put 17" wheels on a car that takes 15", the speedo would read faster than your actually going....(im not considering tire size here)
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Post by Diablo0 » Fri Oct 13, 2006 7:19 pm

Eh... not really. Think of it as a supercharger... want more boost out of a supercharger you typically put on a smaller pulley to make it spin faster.

Another thing which might be a little more hard to explain. Imagine a fixed point on the bent and watch that point go around the pulley, on a larger pulley that fixed point takes say... 5 inches to go from one side of the pulley to the opposite side as it turns which would be half a revolution. Now imagine the same thing with a smaller pulley, for that fixed point to travel from one side to the other pulley it would only have to travel 2 inches instead of the 5 so the pulley is able to spin faster. Make sense? lol
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Post by BlackRoseRacing » Sat Oct 14, 2006 6:16 am

So basically the UDP on my car makes the ALT spin slower and the adition of a bigger pulley is making the ALT run even slower.....mmm
Yet I still manage 14.3volts at an idle with a load and no load...mmm
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Post by Diablo0 » Sat Oct 14, 2006 1:28 pm

Yep... that statement would be correct. I hardly ever see my volts drop below 13.5-14v even with a big load of using the power windows and sunroof at the same time :lol: I think the only time I have seen it lower than that was when my alternator belt flew apart going to Carlisle :lol:
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Post by BlackRoseRacing » Sun Oct 15, 2006 9:40 am

^^^
Ooops :lol:
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Post by Jerome Adams » Fri Nov 10, 2006 2:51 pm

got one, love it. car revs easier and faster...no noticeable hp gain
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