I got a underdrive pulley long time ago and it's been sitting in my trunk for awhile now. Is it really worth installing it or should I stay with the stock one. Also what kind of gains will I be looking at if I do it? Does anyone know a good shop around Seaside heights area that installs after performane parts?

 

no, just send it to me with your intake
really though,
yes it is worth installing. you can do it yourself if you have the right tools. that will be alot cheaper cause remember you also have to buy all new belts.

 

i cant tell you where to get it done but i think of it as a small part of the puzzle. its worth it in my opinion but many say it wont show any gain on the dyno. i went with the unorthodox and ran into a problem. i had to replace the tensioner pulley because the bearings were shot but after that it was not an issue.

 

Any decent mechanics who have done timing belt/waterpump replacement can perform the task. I would highly recommended that you don't do it yourself if you are not mechanically incline! They underdrive pulley is worth the installation and the cost for the installation should be between
$45-60. The noticeable gain I got from it was the car seems to rev easier to speed.

 

do you think it really gives you the 5 to 12 or so hp that they claim it does?

 

I had it, and did notice a power gain. Unfortuately that came at a cost of electrical current, which my amps did not appreciate. So until I have the money for the OEM-size UR lightweight pulley it's stock pulley for me!

 

damn what happened to your amps?? oh yeah your car is hot to t56gen3

 

possible? Nissanperformancemag.com did a dyno on UR-pulley on the 3.5L Altima and they indicated horsepower gain. The claimed horsepowers are shown at a higher RMP range where they should classified as peak horsepower instead. However, it's a worthy mod if you don't plan ungrading your stereo system in the future.

 

I didn't keep it long enough to find out----I was at 12.0V at idle with EITHER the A/C or the Radio on---turn on both and it dropped below that---too low for amplifier to be happy. I had a DMS pulley btw. I'm a former audio installer so as soon as I measured the voltage drop I removed the pulley.

Also, as a side note in doing the change:

The UDP only underdrives the alternator and the compressor, not the power steering (different belt, stock size on UDP.) They say the majority of the power gains are from the weight savings, and since the A/C sux ***** as it is and cuts out at WOT the only thing you are really underdriving under hard acceleration is the alternator---the one component I need the most!!!

 

I am interested in getting on...
But does it really effect the A/C
and how bad
thanks

 

when I first installed the DMS pulley, I noticed the change in interior light from a stop to when I accelerated the car. But since then, the dash light seems constanst. I listen to my stock radio very loud plus the AC on, no dimming of the interior light as when it was initially installed.
Perhaps, the ECU had learned to compensate for the changes???

 

No, the ECU can't do that.

I would recommend the pulley if you have the stock radio and don't plan on expanding on it.

If the alternator can't carry the load at idle then you are on battery power--hence the dimming lights (voltage drop.)

 

The dimming lights were gone after a week or two after the installation even when I full blast the AC and crank up the music real loud. I've carefully monitored this symptom 'cause I was thinking of taking off but it seems fine. Can't figure how that is? Any explanations?

If not, I am gonna have to measure the voltage soon to find out myself???

 

You may be on battery the whole time, therefore the voltage isn't dropping that much. Get a voltmeter on it and test for sure. Who knows, it might be just fine with stock stereo, but I'm running 2 500 watt amps.

 

Yeah but he's got auto and he's gonna have to have another friend hold the flywheel through the access pot on the bell housing.