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Unread 05-20-2005   #1 (permalink)
justin7t is offline Apprentice


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Default How much will I gain with a light flywheel ?

I dont have the jegs in catelog right in front of me but I seen a flywheel in there for $300-400 bucks and says it takes the stock flywheel 30-40 horses to move and only 15hp to move this lightweight one. So does that mean I will be gaining 25-30hp at the wheels if I buy this flywheel or is this just a bogus claim just to sell the product.
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Unread 05-21-2005   #2 (permalink)
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Gimmicks. You dont need a light flywheel right now.
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Unread 05-21-2005   #3 (permalink)
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wont a lighter flywheel help your engine to come down from a rev faster though? I mean when you rev it to say 5000 RPMs, wouldnt it drop faster? It seems to me that our 5.0L's are a little slow to come back to idle... Is this true?
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Unread 05-21-2005   #4 (permalink)
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Yes they are a little slow to drop back down to idle but I dont believe it has anything to do with the flywheel. The motor was designed this way. (Its even worse with an auto) The same thing occurs with the 4.6.

There are restrictor plates that can be placed at the IAC to help drop the rpms a little quicker, but I dont know how well they work.
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Unread 05-22-2005   #5 (permalink)
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Why did they design it this way? What is the benefit of having the engine drop slowly? It drives me crazy when I shift without the clutch, because sometimes it takes way to long for the engine to come down to the correct RPM's...

This is off topic, but I just noticed that the ice cream man is driving past my apartment at 2:00 a.m. Can anyone say creepy...????
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Unread 05-22-2005   #6 (permalink)
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If you install a lighter flywheel, your engine rpm will drop faster than with the stock flywheel, same thing apply's with lighter pistons or any other rotating part. But, on the other hand it will rev up faster, which enables you to shift to the next gear sooner. Less rotating mass makes for a faster revving engine. :thumbsup I would say the ice cream man is on Meth!!
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Unread 05-22-2005   #7 (permalink)
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Im sure there are some trade off's, you might want to look a little deeper into this.
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Unread 05-23-2005   #8 (permalink)
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yeah Ive been kind of curious about this for a while, because I want a faster revving car. Its not a big deal or anything, but you know what I mean. I just get a little annoyed watching the RPM's kind of drop, pause, drop, pause...idle. You know what I mean.
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Unread 05-23-2005   #9 (permalink)
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With the lighter flywheeel, it stores less energy than a heavier flywheel and tends to bog down a whole lot more than heavier flywheel. This argued about a lot and magazines have done dynos showing the heavier flywheel is better down low and the lighter is better from mid to higher basically. I would install it on my car if it was given to me, but they are a lot of $$ if you dont really need it just quite yet.

You will have to drive the car differently with a lighter flywheel.
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