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Author Topic: Anyone install MRZ lightweight UDP or alternator pulley????  (Read 2307 times)

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Offline J_Bond

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Offline J_Bond

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Re: Anyone install MRZ lightweight UDP or alternator pulley????
« Reply #1 on: June 10, 2011, 01:48:20 AM »
there's actually a LOT of results on the web regarding these and people see 5-10hp at the wheels. I hear that billet makes them lees prone to failure like the aluminum ones of past...  thoughts?
2008 2.4L N/A  '14.748' Quarter-mile record holder'
WERKS lightweight battery
Dyno-tuned ECM by HP-Tuners
SOLO Single Catback exhaust
SOLO header
SOLO High Flow Cat
Energy suspension bushings
Koni shocks
Pro-Kit springs
EBC slotted dimpled rotors
Hawk Ceramic pads
K&N Cold air intake with heatshield & DEI thermal-wrapped
BLACKED-out everything...
Redline headlights
Black 18" Sacchi wheels on lightweight Continental DWS tires
Mishimoto transmission-cooler with Royal purple synthetic fluid
Gutted trunk

Offline Gentleman Jack

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Re: Anyone install MRZ lightweight UDP or alternator pulley????
« Reply #2 on: June 10, 2011, 02:58:53 AM »
Jbond,
If you do get a hold of them, let them know their web page has a ton of errors on it.  They should have someone proof that before thet post

No idea on the products themselves.
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Offline Critterman

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Re: Anyone install MRZ lightweight UDP or alternator pulley????
« Reply #3 on: June 10, 2011, 08:58:00 AM »
There was a discussion about the pros and cons a couple of years ago on the BB.  Do not remember the outcome.
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Offline joshmass

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Re: Anyone install MRZ lightweight UDP or alternator pulley????
« Reply #4 on: June 10, 2011, 12:31:02 PM »
I purchased the crank UDP a while back and will be installing it soon. I'll have back to back dyno charts to show the results and will post it.

Offline CT Solstice

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Re: Anyone install MRZ lightweight UDP or alternator pulley????
« Reply #5 on: June 10, 2011, 12:54:26 PM »
Looking forward to the results of this test also!
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Offline J_Bond

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Re: Anyone install MRZ lightweight UDP or alternator pulley????
« Reply #6 on: June 10, 2011, 01:15:33 PM »
awesome.  I'd like to see results on our Kappas with the alternator pulley and the UDP.   I may buy them.  it's fairly inexpensive, and some of the cobalts picked up 5whp.  I'm mostly interested in how much quicker the revs come....
2008 2.4L N/A  '14.748' Quarter-mile record holder'
WERKS lightweight battery
Dyno-tuned ECM by HP-Tuners
SOLO Single Catback exhaust
SOLO header
SOLO High Flow Cat
Energy suspension bushings
Koni shocks
Pro-Kit springs
EBC slotted dimpled rotors
Hawk Ceramic pads
K&N Cold air intake with heatshield & DEI thermal-wrapped
BLACKED-out everything...
Redline headlights
Black 18" Sacchi wheels on lightweight Continental DWS tires
Mishimoto transmission-cooler with Royal purple synthetic fluid
Gutted trunk

Offline joshmass

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Re: Anyone install MRZ lightweight UDP or alternator pulley????
« Reply #7 on: June 10, 2011, 01:31:28 PM »
I would skip the alternator pulley IMO. It won't be seen and won't contribute to any significant performance gains either. Plus the stock alternator pulley has a clutch of some sort that I don't believe the MRZ one has.

Offline odiaz

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Anyone install MRZ lightweight UDP or alternator pulley????
« Reply #8 on: September 03, 2011, 11:04:46 AM »
I don't think these pulleys will make much of a difference.  They are the same size as stock pulleys, the only difference being that these billet pulleys are about 5 oz lighter. Although a reduction in the rotational mass will result in increased horsepower, I don't think a 5 oz reduction will make much of a difference. 

The power gains with under drive pulleys are achieved by a reduction in the diameter of the crankshaft pulley and a larger pulley on the accessories (alternator, ac, ps) thus resulting in a reduction of parasitic loss. It's the same principle as on a bicycle. Lower gears use a smaller drive crank at the pedals and larger ones at the wheel, this reduces the effort required to pedal.  The down side is that wheel does not spin as fast. In terms of your car, this means less effort is required by the engine to turn the pulleys on the accessories but the pulleys on the acessories will turn a bit slower.  Normally, this is not much of a difference in terms of battery charging or effort required to turn the steering wheel but they typically will add about 5% power gain. Since the power gain is based on the speed of the crank, it is linear as you increase rpm.
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