Pulley, Flywheel, Unorthodox... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

stix · 10-30-2001, 06:26 PM

Can anyone tell me the difference from say an aliminum flywheel, unorthodox racing pulley, or a light pulley? Educate me. Thanks

S13Grl · 10-30-2001, 07:05 PM

You do know what a flywheel is, I hope. Aftermarket pulleys and flywheels serve somewhat of a same purpose: they're both meant to reduce the amount of power taken from the engine for all the drivetrain movements so that more power gets to your wheels. The way a flywheel upgrade does it is by reducing the weight by some 50% or so. It's then easier to spin the flywheel and it doesn't take as much power. The same is done with the underdrive pulleys: they're made smaller and fit smaller belts onto them so that it's easier to get everything moving. Unorthodox Racing is just a brand that makes the pulleys, they're most popular. Hope I helped you some.

(Edited by S13Grl at 8<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wow.gif" border="0" valign="absmiddle" alt=':0'>6 pm on Oct. 30, 2001)

konkman · 10-30-2001, 07:23 PM

The unorthodox pulleys, I believe, provide smaller wheels to power other engine components.  By doing this less power is taken from the engine and the power to your wheels.

I have heard horror stories about overheading engine problems, I'm personally staying away from the pulley.

S13Grl · 10-30-2001, 07:53 PM

Hey, I thought I said the same thing! I heard of a few problems about them too, but I think I'll still do it. More people say that they're ok and less say otherwise.

Strider · 10-31-2001, 01:20 AM

Pulleys to me are pretty good. I have also some horror stories about them. Mostly about how Unorthodx Pulleys have an outer lip that rubs against the crank seal and causes oil leaks. Pretty sure thats due to people not tightening it securely or installing the pulley "dry"(not applying lithium grease to the sealing lip of the cracnkshaft oil seal). well thats my input for today

Strider

gh6o6 · 10-31-2001, 06:22 AM

i also herd they ean burn out you electrical like the radio

gh6o6 · 10-31-2001, 06:23 AM

i also herd they can burn out your electrical like the radio.
so i cant type...

HippoSleek · 10-31-2001, 07:34 AM

I won't go into the differences too much, for SOMEONE's sake...

The pulleys depower the accessories, so there may be some problems.  I've never thought them a worthy mod, but many w/ 240s swear by them.

A lightened flywheel works by reducing the rotational mass load between the engine and the tranny.  A lighter flywheel has less mass, and is therefore, easier to get spinning fast.  As a result, engine revs are able to be placed into the driveline more rapidly.  In simple terms, it is lighter and allows the revs to jump up sooner - allowing you to reach peak rpm ranges for hp and tq sooner.  It unfortunately has the equal and opposite effect during shifts... the revs fall as quick as they rise, making matching more difficult and taking you out of your optimal rev zone.

rabbit23 · 10-31-2001, 12:59 PM

i haven't had any electrical issues, i run 700watts off of 2 different Precision Power amps, i still have my original alternator, and no 2nd battery. the asp underdrive pulley works very well for me. the car responds very quickly. the only comparison i can think of is try accelerating with the A.C. on then turn it off and do it again. this was the difference between before pulley and after the pulley.

10-30-2001, 06:26 PM	#1
stix Leaky Injector Join Date: Sep 2001 Posts: 64 Trader Rating: (0) Feedback Score: 0 reviews	Can anyone tell me the difference from say an aliminum flywheel, unorthodox racing pulley, or a light pulley? Educate me. Thanks

10-30-2001, 07:05 PM	#2
S13Grl Married to the Mob Join Date: Dec 2000 Age: 43 Posts: 3,670 Trader Rating: (0) Feedback Score: 0 reviews	You do know what a flywheel is, I hope. Aftermarket pulleys and flywheels serve somewhat of a same purpose: they're both meant to reduce the amount of power taken from the engine for all the drivetrain movements so that more power gets to your wheels. The way a flywheel upgrade does it is by reducing the weight by some 50% or so. It's then easier to spin the flywheel and it doesn't take as much power. The same is done with the underdrive pulleys: they're made smaller and fit smaller belts onto them so that it's easier to get everything moving. Unorthodox Racing is just a brand that makes the pulleys, they're most popular. Hope I helped you some. (Edited by S13Grl at 8<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wow.gif" border="0" valign="absmiddle" alt=':0'>6 pm on Oct. 30, 2001)

10-30-2001, 07:23 PM	#3
konkman Zilvia Junkie Join Date: Aug 2001 Posts: 534 Trader Rating: (0) Feedback Score: 0 reviews	The unorthodox pulleys, I believe, provide smaller wheels to power other engine components.  By doing this less power is taken from the engine and the power to your wheels. I have heard horror stories about overheading engine problems, I'm personally staying away from the pulley.

10-30-2001, 07:53 PM	#4
S13Grl Married to the Mob Join Date: Dec 2000 Age: 43 Posts: 3,670 Trader Rating: (0) Feedback Score: 0 reviews	Hey, I thought I said the same thing! I heard of a few problems about them too, but I think I'll still do it. More people say that they're ok and less say otherwise.

10-31-2001, 01:20 AM	#5
Strider Zilvia Junkie Join Date: Sep 2001 Location: SoCal, Corona Posts: 461 Trader Rating: (0) Feedback Score: 0 reviews	Pulleys to me are pretty good. I have also some horror stories about them. Mostly about how Unorthodx Pulleys have an outer lip that rubs against the crank seal and causes oil leaks. Pretty sure thats due to people not tightening it securely or installing the pulley "dry"(not applying lithium grease to the sealing lip of the cracnkshaft oil seal). well thats my input for today Strider

10-31-2001, 06:22 AM	#6
gh6o6 Zilvia Junkie Join Date: Oct 2001 Location: Dirty Jersey Posts: 550 Trader Rating: (0) Feedback Score: 0 reviews	i also herd they ean burn out you electrical like the radio

10-31-2001, 06:23 AM	#7
gh6o6 Zilvia Junkie Join Date: Oct 2001 Location: Dirty Jersey Posts: 550 Trader Rating: (0) Feedback Score: 0 reviews	i also herd they can burn out your electrical like the radio. so i cant type...

10-31-2001, 07:34 AM	#8
HippoSleek Nissanaholic! Join Date: Aug 2001 Location: elsewhere Posts: 2,081 Trader Rating: (0) Feedback Score: 0 reviews	I won't go into the differences too much, for SOMEONE's sake... The pulleys depower the accessories, so there may be some problems.  I've never thought them a worthy mod, but many w/ 240s swear by them. A lightened flywheel works by reducing the rotational mass load between the engine and the tranny.  A lighter flywheel has less mass, and is therefore, easier to get spinning fast.  As a result, engine revs are able to be placed into the driveline more rapidly.  In simple terms, it is lighter and allows the revs to jump up sooner - allowing you to reach peak rpm ranges for hp and tq sooner.  It unfortunately has the equal and opposite effect during shifts... the revs fall as quick as they rise, making matching more difficult and taking you out of your optimal rev zone.

10-31-2001, 12:59 PM	#9
rabbit23 Zilvia Member Join Date: Jun 2001 Posts: 252 Trader Rating: (0) Feedback Score: 0 reviews	i haven't had any electrical issues, i run 700watts off of 2 different Precision Power amps, i still have my original alternator, and no 2nd battery. the asp underdrive pulley works very well for me. the car responds very quickly. the only comparison i can think of is try accelerating with the A.C. on then turn it off and do it again. this was the difference between before pulley and after the pulley.