UR Pulleys.....
There is no such thing as balancing harmonics. The crank dampers are simply that, dampers. The VQ crank pulley is indeed a damper. If you wish to believe otherwise then you're free to do so, but it frightens me to know that there are aftermarket manufactuers and vendors out there that telling people otherwise. The VQ crank pulley is the EXACT same design as the one used on the Ford Moduler V8s and the LS series V8s from GM. We're talking exact. It's a two piece pulley with a sandwiched elastomer ring. The Ford and GM pulleys are specifically noted by as crank dampers. The elastomer ring is not there to quell accessory noise. I don't even know how this myth got started. Why in the world would a design like that quiet accessory noise when each accessory has it's own pulley? If it were really true that the damper pulleys made for quieter accessories, then why don't the tenisoners, AC, and alternator pulleys have them? More importantly, why isn't VQ with UDP accessory noise louder than that of one with the OEM pulley. I should know, years ago I had a VQ with an UDP.
It would be silly to think that the VQ somehow is immune to crank vibrations. All engines experience crank vibrations, some designs are worse than others (like I6s). Like I said earlier, the flywheel/torque converter are dampers and on the other end you'll need a damper. Take a look at any later model engine and you'll see that same kind of crank dampers.
The chances of your VQ snapping a crank with a UDP is remote because the crank is short, quite beefy, and the lower block is very robust. However, over the long term (we're talking years), it is quite possible for the bearings to experience accelerated wear. You might also notice additional engine vibration in the upper rpms.
It would be silly to think that the VQ somehow is immune to crank vibrations. All engines experience crank vibrations, some designs are worse than others (like I6s). Like I said earlier, the flywheel/torque converter are dampers and on the other end you'll need a damper. Take a look at any later model engine and you'll see that same kind of crank dampers.
The chances of your VQ snapping a crank with a UDP is remote because the crank is short, quite beefy, and the lower block is very robust. However, over the long term (we're talking years), it is quite possible for the bearings to experience accelerated wear. You might also notice additional engine vibration in the upper rpms.
Last edited by Dave B; May 15, 2007 at 07:05 PM.
Honestly, you are the one confused, as you are mixing your terminology up, but its been discussed at length before, on this site, and I'm not going to bea the dead horse anymore. The info is out there...feel free to search for it if you like, or you can call Unorthodox Racing yourself, and they can explain it to you in as great a detail as you wish.
The accessories most certainly DO make slightly more noise at idle with the pullies installed vs without. It is a very faint difference, but it is there.
The accessories most certainly DO make slightly more noise at idle with the pullies installed vs without. It is a very faint difference, but it is there.
Originally Posted by Z1 Performance
or you can call Unorthodox Racing yourself, and they can explain it to you in as great a detail as you wish.
I would at least go with a fluid dampened pulley... But not undampened.
But then again, I plan to keep my car awhile, and not dump it off on someone in a few years with worn bearings from an undampened pulley.
Just my
Last edited by gothchick; May 16, 2007 at 08:06 AM.
Originally Posted by gothchick
Asking a particular vendor to explain (sell) that their component is better than any other particular component in their nitch market?...
I would at least go with a fluid dampened pulley... But not undampened.
But then again, I plan to keep my car awhile, and not dump it off on someone in a few years with bad bearings from an undampened pulley.
Just my
I would at least go with a fluid dampened pulley... But not undampened.
But then again, I plan to keep my car awhile, and not dump it off on someone in a few years with bad bearings from an undampened pulley.
Just my
With 577 posts, I would not expect you to know what has been the history of this discussion...but its literally been discussed, to death, since 2003 and my reposting what has already been posted, is useless
I've already HAD this pulley on my own car since 2003, and am now using it on a built motor as well.
My opinion is that the Z was designed with performance in mind and with that being said,I have had UR pullies on a few cars and every car that they were on ended up spining a rod bearing.I personaly would only get a fluidamper UP if you must go aftermarket.I do not have any facts to back this up other then personal experience so take what I am saying with a grain of salt but I wouldnt recommend it.The SR20 is pretty well balanced from factory too and I spun rod bearings on that with UP's on it too.(the SR20 also is known for having ****ty stock rod bearings though)
SR20's spin rod bearings when stock, so your experience could very well have been the same even if you had 0 mods done.
As long as we're passing annecdotes along, I've done a UR pulley on every single car of mine that they are offered for...and have never had a single issue. Stock motors, built motors, on everything from a Mitsubishi, Nissan, Honda, Audi
As long as we're passing annecdotes along, I've done a UR pulley on every single car of mine that they are offered for...and have never had a single issue. Stock motors, built motors, on everything from a Mitsubishi, Nissan, Honda, Audi
well it was just my opinion that i was stating , and I did say in my previose post that SR20's do have crappy stock bearings though, but appearently you are sold on the aftermarket pully thing so you win dude.but on all the cars I have had including my 96 se-r, the stock UP never created bearing issues.
My point is, I rather save $150+ and have piece of mind, then spend $150+ and always wonder.
My point is, I rather save $150+ and have piece of mind, then spend $150+ and always wonder.
as I've stated, its the users choice
I've seen a stock Z crank pulley literally come apart (the little rubber ring seperate from the pulley), and I've also seen how one (my stock one) balanced out when doing my motor - so I'd hardly call that piece of mind, but at the end of the day, its all up to the buyer.
I've used them countless times, never had a single failure on a Z, or any other car for that matter, and as a result, we proudly sell them - YMMV.
I've seen a stock Z crank pulley literally come apart (the little rubber ring seperate from the pulley), and I've also seen how one (my stock one) balanced out when doing my motor - so I'd hardly call that piece of mind, but at the end of the day, its all up to the buyer.
I've used them countless times, never had a single failure on a Z, or any other car for that matter, and as a result, we proudly sell them - YMMV.
Last edited by Z1 Performance; May 16, 2007 at 11:56 AM.
Originally Posted by Dave B
There is no such thing as balancing harmonics. The crank dampers are simply that, dampers. The VQ crank pulley is indeed a damper. If you wish to believe otherwise then you're free to do so, but it frightens me to know that there are aftermarket manufactuers and vendors out there that telling people otherwise. The VQ crank pulley is the EXACT same design as the one used on the Ford Moduler V8s and the LS series V8s from GM. We're talking exact. It's a two piece pulley with a sandwiched elastomer ring. The Ford and GM pulleys are specifically noted by as crank dampers. The elastomer ring is not there to quell accessory noise. I don't even know how this myth got started. Why in the world would a design like that quiet accessory noise when each accessory has it's own pulley? If it were really true that the damper pulleys made for quieter accessories, then why don't the tenisoners, AC, and alternator pulleys have them? More importantly, why isn't VQ with UDP accessory noise louder than that of one with the OEM pulley. I should know, years ago I had a VQ with an UDP.
It would be silly to think that the VQ somehow is immune to crank vibrations. All engines experience crank vibrations, some designs are worse than others (like I6s). Like I said earlier, the flywheel/torque converter are dampers and on the other end you'll need a damper. Take a look at any later model engine and you'll see that same kind of crank dampers.
The chances of your VQ snapping a crank with a UDP is remote because the crank is short, quite beefy, and the lower block is very robust. However, over the long term (we're talking years), it is quite possible for the bearings to experience accelerated wear. You might also notice additional engine vibration in the upper rpms.
It would be silly to think that the VQ somehow is immune to crank vibrations. All engines experience crank vibrations, some designs are worse than others (like I6s). Like I said earlier, the flywheel/torque converter are dampers and on the other end you'll need a damper. Take a look at any later model engine and you'll see that same kind of crank dampers.
The chances of your VQ snapping a crank with a UDP is remote because the crank is short, quite beefy, and the lower block is very robust. However, over the long term (we're talking years), it is quite possible for the bearings to experience accelerated wear. You might also notice additional engine vibration in the upper rpms.
Last edited by Cannysage; May 16, 2007 at 04:38 PM.
Originally Posted by Cannysage
dood what the hell you talking about, there's no such thing as a harmonic balancing? harmonic balancers AND Dampers are older technology to repel vibrations and I've never heard of newer cars needing this. modern pulleys are agressively balanced from the factory and do not use dampers. you're not going to experience any accelerated wears with our stock pulleys! your mind set is stuck on muscle cars and older tech, cuz they're the ones that needs harmonic balancers and dampers.