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01-31-2007, 03:40 AM | #1 |
Drives: White 2007 2 Door hatch Yaris Join Date: Jan 2007
Location: Rowland Heights, CA
Posts: 22
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How Heavy is the flywheel?
Hey guys I was just wondering how heavy the stock flywheel is for our Yaris'
Thanks -Josh |
01-31-2007, 03:44 AM | #2 |
Drives: 07 5spd red Yaris HB 1.5L 16V Join Date: Oct 2006
Location: Surf City HBC ,CA
Posts: 265
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02-05-2007, 01:11 AM | #3 |
Drives: White 2007 2 Door hatch Yaris Join Date: Jan 2007
Location: Rowland Heights, CA
Posts: 22
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mmm... isn't that a bit heavy for a small car like ours?
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02-05-2007, 01:34 AM | #4 |
Drives: 07 5spd red Yaris HB 1.5L 16V Join Date: Oct 2006
Location: Surf City HBC ,CA
Posts: 265
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negitive- the old echo's flywheels weights about 18lbs.
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02-10-2007, 11:33 AM | #5 |
Drives: White 2007 2 Door hatch Yaris Join Date: Jan 2007
Location: Rowland Heights, CA
Posts: 22
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I donno man.. My buddies stock weight on his VW Corrado (200ish HP) is about 18 lbs.
This may be the cause of our cars having a sticky feeling... |
02-10-2007, 01:54 PM | #6 |
Drives: 2007 Yaris Liftback BBP Join Date: Oct 2006
Location: Bowling Green, Kentucky
Posts: 149
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The heavier a flywheel the better the idle, If you lighten a flywheel sometimes the engine wants to stall...Then again if you lighten it it will also rev faster and give better racing performance, So it is a draw between racing and everyday driving.
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"I am un chien andalusia" - Black Francis |
02-14-2007, 06:29 PM | #7 |
Drives: White 2007 2 Door hatch Yaris Join Date: Jan 2007
Location: Rowland Heights, CA
Posts: 22
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bad idle? Really? I thought having a lighter flywheel is going to make it hard to drive not because of rough idle but because there is less inertia on the flywheel therefore the flywheel is more prone to stop moving when the clutch is applied (Which causes a stall).
Anyways, the stickiness i was talking about is when you rev your engine the rpm stay at the same level for a second when you release the gas. I'm thinking that this stickiness is due to a heavy flywheel. Any opinions? Anyone with a light flywheel? |
02-14-2007, 06:39 PM | #8 |
Lurker supreme!
Drives: old and boosted! Join Date: Nov 2006
Location: Ottawa, ON, Canada
Posts: 792
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I think there are rumours about that the "sticking" is due to the drive-by-wire throttle system. I was also hoping that lightening the flywheel would get rid of this, but would probably only be a partial solution.
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2006 Red Blitzed RS 5-door |
02-14-2007, 07:07 PM | #9 |
maintenance of momentum
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light flywheels have the potential to do exactly what both of you described.
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02-14-2007, 07:38 PM | #10 |
The LittleBastard
Drives: 2007 Yaris Liftback Join Date: Sep 2006
Location: Los Angeles, CA
Posts: 297
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Lighter is going to help greatly in acceleration. I had a 8lbder on my S and it improved the car all around nicely. never stalled, but on occassion would see the rpms drop low while stopping.
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Yaris Mods: 20% Tints Ground wires 2007 Toyota Yaris Liftback - Current 2004 Honda S2000 - Sold 1986 Toyota Corolla SR5 - Sold DIY: Groundwire Kit |
02-21-2007, 09:36 PM | #11 |
Resident Redneck
Drives: 07 Polar White Yaris Sedan 5M Join Date: Jul 2006
Location: Cumming, GA
Posts: 265
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The "throttle stick" is the "lag" in the electronic throttle (drive by wire). The computer takes measuresments from the vacuum system before making throttle adjustments- after you let off of the throttle, there is still "excess" air cycling into the intake manifold via the EGR valve (exhaust being rerouted into "fresh" air for emissions requirements). Once the "over idle" exhaust gas is pushed into the intake and the computer senses an idle-quality amount of exhaust gases coming from the EGR, the throttle lets off. Basically, the throttle "sticks" to allow all exhaust gases to be expelled.
As far lightened flywheels go, lighter flywheel = quicker engine response at the expense of torque. You will have better high end power, but less "grunt" off the line. The same principle works with lightened underdrive pulleys- they allow for higher revs and less parasitic draw, but lose their "underdriving" power- this is why your lights will dim under hard acceleration/high revs- the alternator is not working at peak efficiency.
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02-22-2007, 10:47 AM | #12 |
Drives: White 2007 2 Door hatch Yaris Join Date: Jan 2007
Location: Rowland Heights, CA
Posts: 22
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oh okay, that explains a lot. but EGR didn't seem to effect my Rx-7 it does in this car... Dang... Is there anyway to disable the EGR system electronically?
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02-22-2007, 02:18 PM | #13 | |
Resident Redneck
Drives: 07 Polar White Yaris Sedan 5M Join Date: Jul 2006
Location: Cumming, GA
Posts: 265
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Quote:
It's just one of those things you're gonna have to live with. Thanks CARB!
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