Adriank Posted April 19, 2009 Posted April 19, 2009 What do people think to this? One of my main pulleys is getting replaced as its squaeling a LOT, and ob will have the belts done when this is done. Are these lightened ones any good? Worth doing whilst its all off? http://cgi.ebay.co.uk/NISSAN-350Z-ENGIN ... 240%3A1318 Quote
MrLizard Posted April 19, 2009 Posted April 19, 2009 afaik it depends on the year of the car, or the engine to be more precise, i think, and i might be wrong that they work on the DE models but the revup engine nees them to be rebalanced (does that sound right?), i might be speaking complete rubbish but i suspect adam from z1 will know as he stocks them Quote
IanS Posted April 19, 2009 Posted April 19, 2009 Think Adam at Z1 stocks these so can probably comment with some authority. Seem to remember hearing that there is a risk to ruining engine timing? Would certainly look nice under the bonnet tho! Quote
Martin W Posted April 19, 2009 Posted April 19, 2009 What do people think to this? I'd like to know what the cognoscenti think too Quote
Adriank Posted April 19, 2009 Author Posted April 19, 2009 Lets hope adam notices this thread and pops his head in then! Quote
3FIDDYZ Posted April 19, 2009 Posted April 19, 2009 Hes doing a deal on them on my350z at the moment.... Quote
Stew Posted April 20, 2009 Posted April 20, 2009 I've PM'd Adam the topic so hopefully he can make a comment when he has time butit'll be a number of hours until he's awake! Quote
Chris`I Posted April 20, 2009 Posted April 20, 2009 As the others have said, Adam is the man for these things. He knows which ones work and more importantly which ones are no good. TBH for 60 quid, I wouldnt be putting those on my car These are what you want I think - http://www.z1auto.com/prodmore.asp?mode ... prodid=718 Quote
IanS16 Posted April 20, 2009 Posted April 20, 2009 As the others have said, Adam is the man for these things. He knows which ones work and more importantly which ones are no good. TBH for 60 quid, I wouldnt be putting those on my car These are what you want I think - http://www.z1auto.com/prodmore.asp?mode ... prodid=718 $360 with belts sounds like a pretty good price! Quote
Adam@Z1auto.com Posted April 20, 2009 Posted April 20, 2009 hey guys Thanks Stew for the PM Fitting a lightweight crank pulley is akin to fitting a lightweight flywheel - similar change, but on the other side of the crank. The pullies are offered for all 2002 (I think that's the first year of the Z in Japan, in the US it's 2003) to 2008 Z's. The 2002-2006 cars all use the same exact ones. The HR engine (2007 +, the engine with the dual intakes) uses a totally different pulley. Basically they work by reducing rotational mass. Give me a little while and I'll post the weights on both options. The net change is due to the reduced weight. Overall the engine revs noticeably quicker with the UR pulley installed vs stock. Some people have reported horsepower gains as well, others have not realized these. I'd suspect this is down to the anomolies of one engine vs another - they are like fingerprints at the end of the day. As far as underdriven vs stock diameter, it really doesn't matter unless it's a very, very high revving engine. The underdriving lets the accessories spin at a slower speed, which reduces parasitic drag. Same type of theory as using, say, an electric water pump vs a chain or timing belt driven one. The less things you're asking the crank to spin, the less energy is being lost. Overall on a Z though, the differences between underdriven vs non are basically nill, as most people are not running high enough rpm's to notice the difference. Most of our customers go for the stock diameter unit. As far as the full pulley sets vs the crank alone, as mentioned, the net change is mostly a result of the weight reduction. The factory accessory pullies for the water pump and alternator don't really weigh much. So, the crank pulley alone is the one that effectuates the change. The accessory pullies essentially just look pretty. So for those who want some more underhood "bling", the full pulley set is a nice option and really looks great on the car. Quote
From A to Zed Posted April 20, 2009 Posted April 20, 2009 Thanks Adam, another really useful post Matt Quote
Stew Posted April 20, 2009 Posted April 20, 2009 Thanks Adam. Thought I'd give you a heads up for potential business and your technical view. Quote
Adam@Z1auto.com Posted April 20, 2009 Posted April 20, 2009 stock crank pulley = 7.4 lbs UR underdriven crank pulley - 1.5 lbs UR stock diameter crank pulley - 2.05 lbs Quote
Adriank Posted April 20, 2009 Author Posted April 20, 2009 how much does a stock size pulley replacement cost adam? Quote
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