lightweight flywheel power - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Goinsleeper · 05-20-2006, 01:40 AM

i couldnt find any threads with what i was looking for. i was wondering the basic power differences from stock flywheel to lightened? i know for NA cars, a lightened flywheel is great, but on a turbo app car, why would you want to get through your rpm's as quickly? wouldnt it also interfere with turbo spool? just curious to hear from some of you who lightened the flywheel and whether or not you were happy about the difference and what they were.

ps: also, what is the weight of the stock flywheel?

nismonster · 05-20-2006, 03:44 AM

On the contrary, the lighter the flywheel, the faster the engine spins (because of less inertia) and thus you have better spooling and throttle response. There is however the simple fact that you will lose revs faster as well, particularly when you shift (which is the major issue) and you will have to shift faster to make up for this, especially with a turbo car, to keep the turbo spooling. But you can definitely increase acceleration that way. As for not wanting to go through the rpms faster: the rpm is connected to the speed that you are traveling, when you are in gear. Which means the faster you can go through the rev range the faster you can accelerate. This means lightening any the parts that are spinning (pistons, connecting rods, flywheel, driveshaft, crankshaft, brake rotors and, wheels and tires) will make you accelerate faster.

I hope that helps.

nismonster · 05-20-2006, 03:53 AM

Also, I should warn you. Since, the flywheel weighs less, you will need more revs to get the car going without stalling as well, which can lead to nasty burning clutch smell if you don't adapt quickly, and could be embarassing if you don't remember and stall at a light. Really light flywheels (around 50% percent lighter than stock) are probably no good for the street. Those that are slightly (maybe 30%) lighter than stock and that have replaceable friction rings can be alot friendlier. That way with a turbo car you can accelerate faster but not fall out of spooling rpms when you lift off the throttle, or much more importantly, between shifts which could potentially be a problem. Plus, the car won't be as tricky to launch and would be better suited for street use (in my opinion)

What does anyone else think?

Goinsleeper · 05-20-2006, 04:15 AM

well how much does the stock flywheel weigh? when i search on here i dont get much about it, and if i google it, it just bring up a bunch of sites trying to sell flywheels lol. i was curious about the jgy flywheel but they dont use the friction rings i dont think.

PS: the jgy weighs 10.5 lbs

*DJPimpFlex* · 05-20-2006, 04:50 AM

stock is 18 I believe.....

wootwoot · 05-20-2006, 12:37 PM

Technically your turbo will spool slightly slower with a lighter flywheel because of less load on the engine. But I'm talking 50rpms

aznxplayer · 05-20-2006, 02:09 PM

Quote:

Originally Posted by wootwoot

Technically your turbo will spool slightly slower with a lighter flywheel because of less load on the engine. But I'm talking 50rpms

how would the load of the engine affect the turbo spooling? its the exhaust gasses, not the turn of the engine that spools the turbo. correct me if im wrong please.

Goinsleeper · 05-20-2006, 02:09 PM

a 10.5 lb flywheel with lightened pulleys and no ac or ps wouldnt stall at a light would it? i know a lil about hondas and stalling but not so much about our engine. had a friend with a 7.5 lb on his eg hatch, if the ac was on and he took it out of gear it was over lol.

05-20-2006, 01:40 AM	#1
Goinsleeper Leaky Injector Join Date: May 2005 Location: Huntsville, AL Age: 23 Posts: 89 Trader Rating: (0)	lightweight flywheel power i couldnt find any threads with what i was looking for. i was wondering the basic power differences from stock flywheel to lightened? i know for NA cars, a lightened flywheel is great, but on a turbo app car, why would you want to get through your rpm's as quickly? wouldnt it also interfere with turbo spool? just curious to hear from some of you who lightened the flywheel and whether or not you were happy about the difference and what they were. ps: also, what is the weight of the stock flywheel? __________________ 96' 200sx stock GA ownage(chirpin 3rd) 92' 240sx SR'ed ~motor's back in!

05-20-2006, 03:44 AM	#2
nismonster Join Date: May 2006 Location: Santa Clara Posts: 29 Trader Rating: (0)	On the contrary, the lighter the flywheel, the faster the engine spins (because of less inertia) and thus you have better spooling and throttle response. There is however the simple fact that you will lose revs faster as well, particularly when you shift (which is the major issue) and you will have to shift faster to make up for this, especially with a turbo car, to keep the turbo spooling. But you can definitely increase acceleration that way. As for not wanting to go through the rpms faster: the rpm is connected to the speed that you are traveling, when you are in gear. Which means the faster you can go through the rev range the faster you can accelerate. This means lightening any the parts that are spinning (pistons, connecting rods, flywheel, driveshaft, crankshaft, brake rotors and, wheels and tires) will make you accelerate faster. I hope that helps. Last edited by nismonster; 05-20-2006 at 04:13 AM.

05-20-2006, 03:53 AM	#3
nismonster Join Date: May 2006 Location: Santa Clara Posts: 29 Trader Rating: (0)	Also, I should warn you. Since, the flywheel weighs less, you will need more revs to get the car going without stalling as well, which can lead to nasty burning clutch smell if you don't adapt quickly, and could be embarassing if you don't remember and stall at a light. Really light flywheels (around 50% percent lighter than stock) are probably no good for the street. Those that are slightly (maybe 30%) lighter than stock and that have replaceable friction rings can be alot friendlier. That way with a turbo car you can accelerate faster but not fall out of spooling rpms when you lift off the throttle, or much more importantly, between shifts which could potentially be a problem. Plus, the car won't be as tricky to launch and would be better suited for street use (in my opinion) What does anyone else think? Last edited by nismonster; 05-20-2006 at 04:10 AM.

05-20-2006, 04:15 AM	#4
Goinsleeper Leaky Injector Join Date: May 2005 Location: Huntsville, AL Age: 23 Posts: 89 Trader Rating: (0)	well how much does the stock flywheel weigh? when i search on here i dont get much about it, and if i google it, it just bring up a bunch of sites trying to sell flywheels lol. i was curious about the jgy flywheel but they dont use the friction rings i dont think. PS: the jgy weighs 10.5 lbs __________________ 96' 200sx stock GA ownage(chirpin 3rd) 92' 240sx SR'ed ~motor's back in!

05-20-2006, 04:50 AM	#5
DJPimpFlex Premium Member Join Date: Jan 2004 Location: Emo central..NORCAL BABY! Age: 24 Posts: 2,986 Trader Rating: (3) Rides Gallery: DJPimpFlex	stock is 18 I believe..... __________________ 11 S13s now..... sig got to long... Check out my for sale thread!

05-20-2006, 12:37 PM	#6
wootwoot Post Whore! Join Date: Jan 2004 Location: sarasota florida biatch Age: 23 Posts: 3,850 Trader Rating: (0)	Technically your turbo will spool slightly slower with a lighter flywheel because of less load on the engine. But I'm talking 50rpms __________________ I'm from Florida so I'm probably a bit more strange than you

05-20-2006, 02:09 PM	#8
Goinsleeper Leaky Injector Join Date: May 2005 Location: Huntsville, AL Age: 23 Posts: 89 Trader Rating: (0)	a 10.5 lb flywheel with lightened pulleys and no ac or ps wouldnt stall at a light would it? i know a lil about hondas and stalling but not so much about our engine. had a friend with a 7.5 lb on his eg hatch, if the ac was on and he took it out of gear it was over lol. __________________ 96' 200sx stock GA ownage(chirpin 3rd) 92' 240sx SR'ed ~motor's back in!

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