Drivetrain AT/MT Drivetrain discussions on the 240sx and Silvia

lightweight flywheel + turbo = bad idea???

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Old Feb 18, 2004 | 06:25 AM
  #1  
OWU Joe's Avatar
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lightweight flywheel + turbo = bad idea???

My Honda buddy thinks its a bad idea to have a lightweight flywheel on a turbo KA. I think that it will make the engine rev faster/spool sooner meaning it generates not only more hp sooner but delivers more of it to the wheels. Anyone have any comments or opinions???
Old Feb 18, 2004 | 09:56 AM
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your friend is an idiot

plenty of people with SR's get lightened flywheels.

Dr.
Old Feb 18, 2004 | 02:36 PM
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haha, ya I thought so. Thanks for the input.
Old Feb 19, 2004 | 10:53 AM
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Im looking for answers from people that have light flywheels on their cars too. I would like to know how it effects your driveability. I am going to be replacing my clutch soon and I figure might as well do the flywheel while Im at it.
Old Feb 21, 2004 | 01:39 AM
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your honda buddies sound like my honda buddies. im sure a lightweight flywheel = less rotational mass = faster car.
Old Feb 21, 2004 | 10:10 PM
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Having a lightweight flywheel becomes a problem only when you are pushing 600+ hp.

Since it makes the engine rev up AND down faster, it causes the RPMs to fall outside the desired torque range.

Again this is only applicable on very high HP turbocharged motors with huge turbos that take a long time to spool up.
Old Feb 22, 2004 | 07:56 AM
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Isn't there more of a difference between the actual material of the flywheel? I read somewhere that aluminum is great but you'd want to go with lightened steel for high HP applications. Anyone?
Old Feb 22, 2004 | 05:18 PM
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felt no difference in performance with the lighten flywheel on a stock KA and SR. made them rev quicker and easier to stall at lower speeds but the money could be used else where.
Old Feb 22, 2004 | 07:31 PM
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Originally posted by l2aine
Isn't there more of a difference between the actual material of the flywheel? I read somewhere that aluminum is great but you'd want to go with lightened steel for high HP applications. Anyone?
Yes, for really high HP apps it is better to use a harder material such as chromoly (chormium molybdenum) steel.

But not too many people get HP numbers high enough to really require that. For most people, aluminum is fine.
Old Feb 23, 2004 | 03:42 PM
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try it out and let us know. just when you are racing power shift and your turbo wont spool down at all.
Old Feb 23, 2004 | 06:25 PM
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ahh yes, power shift the poo out of it so you can crap the trans right on out of the car.
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