MPx Underdrive pulley
MPx Underdrive pulley
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!
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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- BlackRoseRacing
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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
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
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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.In a few words. AWESOME.
2000 Plymouth Neon MTX
Mods: Aem cai, Powder Coated Valve Cover, Pretty Taillights, Alpine Deck, rt exhaust, mpx underdrive pulley msd wires.
Mods: Aem cai, Powder Coated Valve Cover, Pretty Taillights, Alpine Deck, rt exhaust, mpx underdrive pulley msd wires.
^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.
-Derek
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- BlackRoseRacing
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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...
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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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!
- BlackRoseRacing
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No, you get a power steering and alt. belt, as well as an A/C belt, if your car has A/C.glasswars wrote:When you get the UDP, what else do you have to get? Just a new belt? Is it the timing belt?
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.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
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- LCPLPunk
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oh man...i may ahve to get one of these, but i dunno if i want to lose any AC power..
2001 Neon R/T
Deyeme Motor Mounts, Booger Bushings, JohnnyMopar Cradle Bushings, SRT Silver shift knob, Maddog STS, SRT Rear Seat, K&N WAI, Magnecore Wires, Mobil 1 Full Synthetic Oil, Coil pack heat shield
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Deyeme Motor Mounts, Booger Bushings, JohnnyMopar Cradle Bushings, SRT Silver shift knob, Maddog STS, SRT Rear Seat, K&N WAI, Magnecore Wires, Mobil 1 Full Synthetic Oil, Coil pack heat shield
""The bitterest tears shed over graves are for words left unsaid and deeds left undone" - Harriet Beecher Stowe"
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.
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.
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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- BlackRoseRacing
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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)
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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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
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
-Jason
Black '02 Neon R/T | White '02 Neon R/T - SRT-4 Engine Swap
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Try not to become a man of success but rather to become a man of value. - Albert Einstein
Black '02 Neon R/T | White '02 Neon R/T - SRT-4 Engine Swap
^^^ no, that isn't what I look like haha
Try not to become a man of success but rather to become a man of value. - Albert Einstein
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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 I think the only time I have seen it lower than that was when my alternator belt flew apart going to Carlisle
-Jason
Black '02 Neon R/T | White '02 Neon R/T - SRT-4 Engine Swap
^^^ no, that isn't what I look like haha
Try not to become a man of success but rather to become a man of value. - Albert Einstein
Black '02 Neon R/T | White '02 Neon R/T - SRT-4 Engine Swap
^^^ no, that isn't what I look like haha
Try not to become a man of success but rather to become a man of value. - Albert Einstein
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