DDM Project 370Z

wstar · 07-08-2009, 03:08 PM

Quote:

Originally Posted by DDMotorsports

Just ordered an Unorthodox Racing stock diameter crank pulley! According to them, this will shed 7 lbs. of rotating mass off of the front of the car

Quote:

Originally Posted by DDMotorsports

Yeah it does also have effect but if its also heavier than the UR one then it will be a wash. Even if they weigh the same, I would guess that it will make 1whp difference max, or less. You will gain more from less weight than less parasitic drag. Like I said, we'll see once I put the UR pulley on my car. I personally prefer to use a stock diameter pulley to maintain factory accessory outputs from the alternator, power steering, etc.

Stillen quotes the stock pulley at 4.72 lbs. My bathroom scale, while not very accurate or repeatable unfortunately, agrees that my stock pulley is somewhere in the vicinty of 4.5-5-ish lbs. So there's no way it's shaving off 7lbs

It will be interesting to get the Unorthodox one weighed though so we can compare. Stillen's showing 1.32 lbs for their standard-sized one and 0.99 lbs for their underdriven model, but I don't know if anyone's tried to accurately verify those numbers.

M.Bonanni · 07-08-2009, 03:10 PM

Quote:

Originally Posted by wstar

Stillen quotes the stock pulley at 4.72 lbs. My bathroom scale, while not very accurate or repeatable unfortunately, agrees that my stock pulley is somewhere in the vicinty of 4.5-5-ish lbs. So there's no way it's shaving off 7lbs

It will be interesting to get the Unorthodox one weighed though so we can compare. Stillen's showing 1.32 lbs for their standard-sized one and 0.99 lbs for their underdriven model, but I don't know if anyone's tried to accurately verify those numbers.

Well then that makes me further doubt their hp claims lol. Their weight calculations were on a G37, but I am assuming that they would be the same pulley as the 370Z.

wstar · 07-08-2009, 03:13 PM

Actually I just remembered that I have a more accurate small scale in the kitchen that I use for cooking ingredients. My stock pulley came out to 4.75 lbs there, with an accuracy of roughly +/- 0.05, so pretty much right in line with Stillen's reported number for it.

07-08-2009, 03:13 PM	#3 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3595	Actually I just remembered that I have a more accurate small scale in the kitchen that I use for cooking ingredients. My stock pulley came out to 4.75 lbs there, with an accuracy of roughly +/- 0.05, so pretty much right in line with Stillen's reported number for it. __________________ 7AT Track Car! Journal thread / Car setup details

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