lightening the flywheel
08-12-2003, 12:07 PM
#1
AudiWorld Super User
Thread Starter
Join Date: May 2001
Location: Calgary, Alberta
Posts: 4,007
Likes: 0
Received 0 Likes
on
0 Posts
lightening the flywheel
in very general terms, does lightening the flywheel increase or decrease the chances of clutch slippage when mated to a rather modified engine?
08-12-2003, 01:51 PM
#3
Junior Member
Join Date: Jan 2002
Posts: 655
Likes: 0
Received 0 Likes
on
0 Posts
BUT the engine will slow down quicker too
I think this also means you will have to be a little more gentle with the clutch or you will really slow the engine down, unless you match the revs perfectly.
08-12-2003, 01:52 PM
#4
AudiWorld Super User
Join Date: Apr 2002
Posts: 2,402
Likes: 0
Received 0 Likes
on
0 Posts
plus spool up/down faster... Not sure why that would be much benefit though (slight I'd imagine)
I'd say a heavier one helps gas mileage and reduces engine load at high speeds.
This is all from my imagination so I could be full of it. Please enlighten me if so
This is all from my imagination so I could be full of it. Please enlighten me if so
08-12-2003, 03:10 PM
#6
Junior Member
Join Date: Jan 2002
Posts: 655
Likes: 0
Received 0 Likes
on
0 Posts
Basically it's the same as removing a hundred or so pounds from the car itself
That's kind of a random figure, but effectively you are reducing the mass that has to be accelerated.
The flywheel has to change speed every time the engine changes speed, so when you hammer on the gas, it has to accelerate all that mass to the new RPM.
Reducing the weight of the flywheel is the same as reducing the weight of the whoel car, but rather than looking at accelerating an extra 100 pounds to 60 mph, you're looking at spinning up x lbs to 4000 RPM.
In theory, it doesn't have any effect once you are at your desired speed, apart from buffering any changes - it acts as a kind of low pass filter.
My $0.02 worth.
The flywheel has to change speed every time the engine changes speed, so when you hammer on the gas, it has to accelerate all that mass to the new RPM.
Reducing the weight of the flywheel is the same as reducing the weight of the whoel car, but rather than looking at accelerating an extra 100 pounds to 60 mph, you're looking at spinning up x lbs to 4000 RPM.
In theory, it doesn't have any effect once you are at your desired speed, apart from buffering any changes - it acts as a kind of low pass filter.
My $0.02 worth.
08-12-2003, 03:24 PM
#7
Member
Join Date: Sep 2002
Posts: 721
Likes: 0
Received 0 Likes
on
0 Posts
I would like a lighter flywheel on my v6 becuase it takes so looong for the revs to drop.
Going from first gear to second you have to wait, and wait, and wait...
On the only 5 cyl I have ever driven ('87 4000 Q), I don't remember this being so bad?
On the only 5 cyl I have ever driven ('87 4000 Q), I don't remember this being so bad?
Trending Topics
08-12-2003, 05:23 PM
#9
No Bozos!
Join Date: Mar 2002
Location: Cowlesville, NY.... Pop 1,067
Posts: 7,899
Likes: 0
Received 0 Likes
on
0 Posts
It makes a big difference
Not necessarily all good though.
You will rev MUCH quicker, however depending on exactly how light you go, you will find that cruising, you can feel every little burp in the road. Yes it rev's quicker, both up and down.
The extra mass dampens the variations in the road, but for performance that's not a good thing.
Even at speed you still want to have the ability to rev on demand.
If you look at the Sach's and now the 10,000 RPM flywheel/PP combo's you'll also see that the mass is also centered more towards the center of the flywheel. My Sach's unit is only 200mm, by comparison the stock unit is 240mm. You take the mass and keep it closer to the centerline of the drivetrain, and it also acts to lighten the load.
It's nice when you can be plugging along at 4k and just stomp on it, and leave some serious rubber on the ground.
You will rev MUCH quicker, however depending on exactly how light you go, you will find that cruising, you can feel every little burp in the road. Yes it rev's quicker, both up and down.
The extra mass dampens the variations in the road, but for performance that's not a good thing.
Even at speed you still want to have the ability to rev on demand.
If you look at the Sach's and now the 10,000 RPM flywheel/PP combo's you'll also see that the mass is also centered more towards the center of the flywheel. My Sach's unit is only 200mm, by comparison the stock unit is 240mm. You take the mass and keep it closer to the centerline of the drivetrain, and it also acts to lighten the load.
It's nice when you can be plugging along at 4k and just stomp on it, and leave some serious rubber on the ground.