It was on a 3.5 Altima, but the Max should expect the same. 6.5 HP gain and longer engine life.

http://www.nissanperformancemag.com/current/altima_ur/

 

Can I put this UDP on my stock 2k auto max w/ a CAI?

 

yes

 

actually you cant put that pulley on. the 3.5 has a different pulley than the 3.0 but yes you can put a lightened underdrive pulley on your 2k1 auto. 6.5 hp seems a bit on the high side at least for the 2k1 but blubyu2k2 has the pulley on his 3.5 and he couldnt tell a difference. the only thing i noticed with mine was less hesistation.

 

if you have a 2k/2k1, make sure the UDP has a metal timing ring bolted to it. The 2k2 and up pulleys do not have this timing ring.

 

how much is this pully and where can i get it for my 2k... how much will a tech charge to install it?

 

Are you speaking from experience or are you just trying to help me relive the month long hell that I went through?






















I did get a free flywhel out of it though so I guess I shouldn't complain.

 

They are around $175-$200. They will charge you about $150 to install it. Save your $$ and buy some springs.

 

thats like 400$ for nothing....

 

Yeah, pretty much, maybe a little better throttle response. Maybe...

 

$175 if you take off your dress and install it yourself.

 

$150.00!?!?!? You didn't pay me that much!!! Dammit

 

The 3.5 altima had some nice gains from a AEM intake. My 02 didn't show anything. So I'd really rethink the comment "the Max should expect the same". Granted intakes and UDP's are different. But I'm still skeptical.

 

True, but after breaking a nice socket wrench and one of the belt tensioners, I ended up paying a mechanic friend $100 for the install, tensioner fix, and an oil change. Plus I was in a hurry so I could get to Maxus that day.

 

That's what the rapists at Midway Nissan wanted for it. I doubt a regular shop would charge more than $100.

 

I'll cut that in half for y'all:

$80 buckarinees
http://www.rvmracing.com/subcatmfgpr...275&1=282&2=-1

water-cooled twin turbo dreams
woosh

 

Can someone please explain to me how this would prolong engine life.

 

I can't seem to find it, but someone either here or on Altimas.net had a good write up on it explaining how it would prolong engine life and all of your electrical components. This definately isn't a good price/performance mod, but if you want a little more it's there. I noticed the rpms fly more rapidly and it helped alot with the low end torque loss with my Intake. The FrankenCar midpipe helped the lag with mine tremendously. It's all about together. You may not notice 6hp from one particular mod, but thrown together with a few 6hp mods and it adds up.

 

Found it here on the org. Larry's post:

"An underdrive pulley is a pulley of different size than factory which is designed to lower the speed of the accessory that it drives. By reducing the size of the crank pulley all the driven accessories turn slower. By increasing the size of the accessory, driven pulleys, you also reduce the speed but of only that accessory. The alternator pulley is an example of having to be made larger to turn slower.

The driven accessories work much like a fan works. If you increase their speed it takes more hp to turn. Conversely, by decreasing the speed less hp is required. You are freeing up hp you already have by reducing the drag or hp required to turn the accessories.

Some underdrive pulley sets free up 10-15 hp. On our Maxima's we don't drive a water pump or smog pump so there is not as much gain to be had. I got .15-.20 et improvement with a three pulley underdrive system on a Mustang I previouly owned. I would expect no more than about .05-.1, or about 5 hp, on our Maxima's with just a crank pulley. Not a lot of gain but you will also get a little better fuel economy and longer lasting accessories. Sure is good insurance to protect that alternator at 6000+ rpm that our engines turn.

An overdrive crank pulley would be larger than factory. An overdrive alternator pulley would be smaller than factory. People often us overdrive alternator pulleys in conjunction with an underdrive crank pulley to increase the speed of the alternator back up somewhat and improve charging at idle. You would lose some of the benefits of the underdrive. Some overdrive crank pulleys are available when a supercharge is driven by the crank and more boost is required.

I would highly recommend an underdrive pulley. It' a little trick that has been around for years and is tried and proven."

 

hehehe... my bad man... didn't mean to make you relive any of that mess you went through.

 

I really didn't say it would prolong "engine" life, only accessory life.

Whether you can measure gains or not, it is there. If you slow down your accessories you will increase hp/torque. Unfortunately on our Maxima's that do not have a water pump turned by the crank pulley, the gains are not as great as some engines.

Give ASP a call (281 261 5811, 281 261 8845). They make the best quality pulleys available. They are a complete CNC machine shop and have been making pulleys since 1988. I have their prototype 2K2 on my car. If they do not have them in stock they should soon.

 

 

I was quoting two people at the same time. Sorry. Nissan Performance Mag said it would prolong engine life, but that's not a direct quote.

 

Intake 5-10 HP - $100-200+
Ypipe ~15 HP - $200-400
B-pipe ~5 HP - $150+
RT Cat ~5 HP - $200
UDP ~5 HP - $80 or $185

I don't see how the UDP is worse than any other mod for price/performance if you install it yourself. In fact if it really does give around 6 WHP and you go for the RVM racing UDP for $80 I would say it is very good for price/performance.

Maybe they figure anything that puts less load on the engine will prolong its life

Is there any reason to think the 3.0 VQ would see less gains?