Lightweight flywheel - Page 2 - Subaru WRX Forum
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#16 Old 10-06-2005, 04:13 PM
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Hell yeah I done got lots oh A's
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#17 Old 10-06-2005, 06:12 PM
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Quote:
Originally Posted by Nose Nuggets
herm..

well, my boost isent adjusted soly by the rpm my engine is at. if im not giving it at least half throttle, i dont get boost. just becuase its at x rpm, does not meen the engine is pushing out enough exhaust to get the turbo going.
Boost is controlled by TPS, and load. u could be at 6500rpm and not build bost because you only at 1/4-1/2 throttle and the wastegate would be bleeding exhaust slowly
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#18 Old 10-06-2005, 07:15 PM
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Quote:
Originally Posted by Nose Nuggets
well, my boost isent adjusted soly by the rpm my engine is at. if im not giving it at least half throttle, i dont get boost. just becuase its at x rpm, does not meen the engine is pushing out enough exhaust to get the turbo going.
If he wants the engine to rev quicker, then more then likely he is going to be full throttle.
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#19 Old 10-06-2005, 07:32 PM
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im just making the observation!

a lighter flywheel does not meen the turbo spools faster/sooner/quicker

im saying it lets the engine increase in rpm quicker, if that subsequently allows the car to spool the turbo faster, it is because its the overall circumstances.

i dont want this guy to get a new flywheel, and get all huffy because his turbo dosent spool any quicker when hes sitting there in nutral testing it out.
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#20 Old 10-07-2005, 03:12 AM
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Quote:
Originally Posted by Nose Nuggets
im just making the observation!

a lighter flywheel does not meen the turbo spools faster/sooner/quicker

im saying it lets the engine increase in rpm quicker, if that subsequently allows the car to spool the turbo faster, it is because its the overall circumstances.
^------- that is exactly right.

"Life's a bowl of punch so go ahead and Spike it!" -311
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#21 Old 10-07-2005, 10:33 AM
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Thanks for the help.
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#22 Old 10-07-2005, 11:01 AM
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A lightened flywheel = new clutch and tranny sooner.
They aren't the best for our AWD setup.
The flywheel acts like a heat sink, and when it is lightened, there is less mass, it really messes with our AWD setup.
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#23 Old 10-07-2005, 11:28 AM
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Quote:
Originally Posted by slug1
A lightened flywheel = new clutch and tranny sooner.
They aren't the best for our AWD setup.
The flywheel acts like a heat sink, and when it is lightened, there is less mass, it really messes with our AWD setup.
really?

do you have some resources to back this up? that sounds odd to me.

by the way, just because something has less mass then something else, does not meen it has less of an ability to retain heat. usualy an objects density will negotiate how well it retains heat. like wood vs steel
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#24 Old 10-07-2005, 12:03 PM
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I was passing on information to your from forums. There has been a number of people that are having problems with lightened flywheels, I just don't want you to hurt your WRX.
if you go with a lightened flywheel, check what it is made of and compare it to the stock flywheel, when there is that much heat every little bit of material helps, I am a mechanical engineer for General Electric Aircraft Engines, so I know a little bit about hink sink and such, just be carful.
I am not saying no, just make sure you get a quality part, it may cost more but you will be thankful in the long run.
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#25 Old 10-07-2005, 12:11 PM
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check out this article, these guys know what they are talking about.

In this particular area you need to change the FLYWHEEL to a 14+ pound item. There are 12 pound units out there, but I want to run a 14 pound unit. I will explain way. We do not endorse ultra light flywheels for the same reason we do not endorse elimination of the harmonic vibration damper. We once lost WRX motor on the dyno due to low rotating mass, and in 1995 Prodrive broke both crankshafts in a WRC event because of too light a flywheel and a solid crank pulley. In that case it was actually the addition of titanium rods that put them over the edge, but there are also timing belt pulley and tensioner parts that need to be modified to safely run a light weight Subaru racing motor. That is not a place we want to go with a street car, even if it is 'dual-purpose'.
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#26 Old 10-07-2005, 01:29 PM
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so sounds like 14lbs + is safe.

interesting stuff, where did you find that?
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#27 Old 10-07-2005, 01:47 PM
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#28 Old 10-07-2005, 02:38 PM
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404 not found

maybe

www.spdusa.com/pulley_kit.htm
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#29 Old 10-07-2005, 03:50 PM
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that's the one.
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