I may do the full up before and after dyno on it, I haven't decided yet. I'm going to LA this weekend to get my differential swapped so it would be very easy just to have them do the pulley at the same time, but I wouldn't be able to judge the gains at all.

 

It will be a HUGE war that will be very bloody with lots of casualties

 

I will try to repost over on my350z forum. They are very performance minded over there.

 

OK here we go.



i have been happily running the UR crank pulley for over 20K miles, with no problems. i have oil reports from blackstone labs to back it up too. i assure you that you will not make any power with this modification. fluidamper makes these for dirty old american engines that don't have the same tolerances as our motors, and actually benefit from the balancing that it desperately needs. especially with all of the reciprocating mass that we don't have, like pushrods, lifters, and rocker arms. the funny thing is, on their website, under balancing it says "internal". fluidamper is simply tapping into a market where people have money, and are happy to spent it on their cars.

i predict that the first person that installs this pulley will come back saying how smooth and great their motor is running, and how it feels so much quicker, blah, blah, blah. just like grounding kits. it cracks me up.

the stock pulley is fine, but if you want more horsepower get a lighter pulley. this mod will only make your wallet lighter.

perhaps this mod will allow your motor to go 300,000 miles instead of 200,000 miles. however, i think most of us will probably sell it by the time it gets to 100,000 or less.


Just one guy's educated opinion,
Chad

 

I can see your post on My350z.

 

Doesn't that pretty much describe every aftermarket parts company in existence? I'm not looking to start a war, I'm going to give it a shot and give my honest opinion, that's all.

 

you are absolutely right!! everyone is trying to sell their product, and make money. some products are good, and some are bad, but it is the company's right to sell anything they want.

take for instance the guys on ebay that sell a simple resistor that they charge 30 bucks for, and call it a fuel enrichining, timing advancer.

Chad

 

Well let's not pass jugdgement until someone checks it out. I don't expect to see gains anywhere near the UR underdrive pulley for obvious reasons, but I do think that there are gains to be had. It's slightly lighter and seems to have more mass at its center which should mean lower rotational inertia or resistance to acceleration.

It's a little early to call BS on the product.

 

All I can say is out of the thousands and thousands of people that have run UR pulleys, NOT A SINGLE ONE has EVER shown proof of any premature wear on the engine or any damage due to the pulley. This has been backed up by many oil analysis results, even several on this forum.

I also only know of a very few people that have complained about negative side effects with a UR pulley, and those are very very few in number. That would suggest a problem with the install, or perhaps something else is wrong.

You just plain can't argue with a success rate this high, the numbers don't lie.

 

Clearly an opinion though not terribly educated. Nissan racing has been running fluid damper-based pullies on thier SR20, VG turbos, twin turbo VQ32, and RB series motors for years. NASCAR and F1 do the same. "dirty old american engines" with poor tolerances and balancing is something perpetrated by import owners and ricers that don't know much about domestic engines. In this day and age, all motors are built to very tight tolerances and balancing regardless if it's a domestic or import motor. I'd hardly call GMs 500hp LS7 a poorly balanced motor seeing that is displaces 7 liters and can rev to 7000rpms. Take a look at any late model engine and you'll see the same kind of elastomer damper-based crank pulley, import or domestic. The UDP does completely away with the damper which is a big no-no in my book and most knowledge gearheads know that the damper is there for a very good reason. The Fluidamper will reduce a more bending of the crank than the stock pulley ever could. That means a more effiecent motor and probably more power. I know that the Ford 5.0 V8 picks up 13-16whp with just a Fluidamper crank pulley over what the 6whp a full set of UDPs gains it. Why don't more Stang runs the damper? Because it cost about 2 times as much and they've been tricked into believing the reduced rotational mass hype over the damper benefits.

I've never read of a VQ failure with an UDP and I know my VQ30 in my Maxima had no mechanical problems. I did notice something that really made me question the UDP on my VQ30 other than the fact that my car was no quicker or faster in the 1/4 mile, my VQ30 lost all it's velvetly smoothness when I added the UDP. The engine was louder and vibrated a lot more, especially above 4500rpms. The engine felt and sounded very strained when I revved it to 7000rpms. After 1.5 years of use, I took off the UDP and put the stocker back on and guess what? The VQ was smooth again not to mention the car wasn't near as boggy on gear changes or leaving from a stop smoothly. Those with VQ35s and UDPs may not notice the increased vibration simply because the VQ35 isn't remotely as smooth running as the VQ30 is.

 

I could understand this kind of a response if someone would have posted in this thread that the UR pulley sucks and would ruin your car, but nobody did. So what are you getting so excited about?

 

by this, i meant old cars (60's and 70's model cars) which is where fluidampers business started.

 

fight fight fight fight fight fight fight fight!!!!!

 

Okay, agreed.

FYI-

Even today's cranks do require individual balancing. If you've got you're OEM crank pulley laying around, take a look at the backside of the pulley. You'll see a set of dimples. These dimples balance the pulley and are specific to your VQ. Not one VQ pulley will have the dimples in the same place. Just something to consider when Unorthodox tells you they're pullies are "perfectly balanced". A perfectly balanced pulley is not what you want. Instead, you want it to balance the crank and work as a system.

 

Again DaveB We are on the same page here. I busting *** right now to get this header install done. IM trying to get this car on a dyno this weekend. I can change the damper in about 30 minutes. A back to back is what I want to do here. The Crawford header install is a lot of work but easy. As far as the balance of the VQ - I think its sucks from the factory and the UD pulleys at upper "high rpms Just plain sucks" I know what a fine tuned engine feels like. The UDs your out of here. I got the engine back together and all is left is the cats and exhaust system. Pasta