Nissan 370Z Forum - View Single Post

Jordo! · 09-29-2011, 08:13 PM

FWIW I look at mods in terms of bang for the buck as well as bang for the risk likelihood and bang for the magnitude of risk severity.

Bang for the buck, 5-6 whp for the cost of the pulley and install is relatively good value.

Bang for the risk likelihood is unknown, because the base rate for failure due to pulleys in not known, but lets say for sake of argument it's something to the tune of 5-6 whp for less than a 1% risk, which sounds very reasonable.

Bang for magnitude of risk severity... 5-6 whp for potentially catastrophic engine damage. That's not so great...

That last one has me convinced that although it's not exactly a terrible idea to run a pulley, it's not a really good idea either.

You can apply that same set of decision criteria to FI, which can also result in a destroyed engine or trans with a bit of bad luck (and probably a higher risk likelihood), but you get a lot more bang for the risk severity magnitude.

Not suggesting that everyone should adopt this overly cautious outlook, and of course individual results will vary anyway, but this is just how I try to decide what is and what is not worth doing.

09-29-2011, 08:13 PM	#13 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	FWIW I look at mods in terms of bang for the buck as well as bang for the risk likelihood and bang for the magnitude of risk severity. Bang for the buck, 5-6 whp for the cost of the pulley and install is relatively good value. Bang for the risk likelihood is unknown, because the base rate for failure due to pulleys in not known, but lets say for sake of argument it's something to the tune of 5-6 whp for less than a 1% risk, which sounds very reasonable. Bang for magnitude of risk severity... 5-6 whp for potentially catastrophic engine damage. That's not so great... That last one has me convinced that although it's not exactly a terrible idea to run a pulley, it's not a really good idea either. You can apply that same set of decision criteria to FI, which can also result in a destroyed engine or trans with a bit of bad luck (and probably a higher risk likelihood), but you get a lot more bang for the risk severity magnitude. Not suggesting that everyone should adopt this overly cautious outlook, and of course individual results will vary anyway, but this is just how I try to decide what is and what is not worth doing. __________________ Enjoy it. Destroy it. Last edited by Jordo!; 09-29-2011 at 08:18 PM.