Crank Pulley and Lightweight pullies not making a difference in performance?
11-22-2005, 08:46 AM
#22
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what makes you think the KJR wont free up any power and the UR one will? the fact thats its underdriven? Even UR admits that being underdriven might only add 1 hp. The gains are from the weight loss, not the size. The KJR and the UR are almost the same weight....like 0.3lbs difference
11-22-2005, 09:09 AM
#24
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Originally Posted by dxgary77
light weight pully will not add top end power. it does freeup hp at low end.
this is due to the increased revolutions of the motor (which now has to turn less weight) being higher at the upper end. this decreased weight allows it to spin easier translating to less parasitic loss on the drivetrain.
i had the ur pulleys on my z and noticed a significant improvement not only in drivability but also in power.
11-22-2005, 11:55 AM
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From the weight reduction ( less rotating mass) the gain in performance will be linear accross the rpm range.. The lighter pulley means more of the engines tq is available to the wheels..The angular momentum of a pulle is H=I W where I = inertia (the mass component) and W = rpm..When you substitute the I difference between the 2 pulley sets the difference in H is the performance gain..The W is the same in both cases..
11-22-2005, 08:05 PM
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I dyno'd the KJR here are my results.
http://g35driver.com/forums/showthread.php?t=75567
I still can't figure out why I didn't see any gains.
http://g35driver.com/forums/showthread.php?t=75567
I still can't figure out why I didn't see any gains.
11-22-2005, 10:50 PM
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http://www.turbomagazine.com/tech/0403tur_350z/
Dyno from turbo magazine, their project Z.
And here is the nissan magazine articles.
http://www.nissanperformancemag.com/august03/350pulley
Most people do get gains, what are you trying to prove here?
Dyno from turbo magazine, their project Z.
And here is the nissan magazine articles.
http://www.nissanperformancemag.com/august03/350pulley
Most people do get gains, what are you trying to prove here?
11-24-2005, 07:30 AM
#30
Originally Posted by King56
http://www.turbomagazine.com/tech/0403tur_350z/
Dyno from turbo magazine, their project Z.
And here is the nissan magazine articles.
http://www.nissanperformancemag.com/august03/350pulley
Most people do get gains, what are you trying to prove here?
Dyno from turbo magazine, their project Z.
And here is the nissan magazine articles.
http://www.nissanperformancemag.com/august03/350pulley
Most people do get gains, what are you trying to prove here?
11-24-2005, 08:18 AM
#31
Originally Posted by Diesel350
Don't you think that if Crank Pulley's were worth it that Nismo would have already produced a crank pulley?
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350z, crank, crankshaft, datsun, difference, horse, howmuch, light, lighter, lightweight, make, performance, power, pulley, pullies, weight
