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Joined: Jun 2000
Posts: 1,469
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: Jun 2000
Posts: 1,469 |
The 4-5 HP & torque seen by Ford Racing is pretty typical for UDPs.
Most of the power gain is via underdrive. The weight loss is less important because it is has small diameter (lower moment of inertia). 6 lbs lost here is less effective at freeing up power than a flywheel that is 3X the diameter. Also note that power gain will be more significant in lower gears, as benifits diminish with greater rotational inertia. There is an equation (where they discussed this in SCC about a year ago). A #10 lighter flywheel (on a zetec Focus) gained about 22 HP is 1st, about 9 HP in second, about 5 in 3rd, only 2 or so in forth. Sice we dyno in forth..that is all you will SEE when you dyno. But you will benifit from bigger power in low gears, percieved as faster reving. This is why flywheels are nice but a 6+ drop from a UDP would only see a small fraction of that gain..probably only noticed in first gear.
Its a nice mod, unless it screws up your crank harmonics..
1999 Amazon Green SVT Contour (#554/2760)
"People demand freedom of speech as a compensation for the freedom of thought which they seldom use."
-Soren Kierkegaard (as posted by Jato)
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Joined: Aug 2001
Posts: 17,248
CEG road warrior
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CEG road warrior
Joined: Aug 2001
Posts: 17,248 |
Originally posted by Dan Nixon:
Its a nice mod, unless it screws up your crank harmonics..
Not if you have a Zetec. 
Hector
2003 Rally Red Mitsubishi Evolution VIII
257HP/259TQ
2005 Lapis Blue Mazda 6s
RET: 00 Cabernet Red Ford Contour Zetec ATX SUPERCHARGED
160HP/141TQ
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Joined: May 2003
Posts: 5,621
Hard-core CEG'er
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OP
Hard-core CEG'er
Joined: May 2003
Posts: 5,621 |
I FEEL BAD FOR LAUNCHING THIS THREAD 
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Joined: May 2003
Posts: 5,621
Hard-core CEG'er
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OP
Hard-core CEG'er
Joined: May 2003
Posts: 5,621 |
.. and BTW, mine OTB is gonna be here in a mater of a week - Rick didn't specify the exact delivery time, but said it was gonna take a coupla weeks, and it was about 10 days ago 
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Joined: May 2002
Posts: 21,653
I have no life
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I have no life
Joined: May 2002
Posts: 21,653 |
So you're the one that ordered right before me. If my TB doesn't come by Friday, I'm gonna be mad at you.  
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
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Joined: May 2003
Posts: 5,621
Hard-core CEG'er
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OP
Hard-core CEG'er
Joined: May 2003
Posts: 5,621 |
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Joined: May 2002
Posts: 21,653
I have no life
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I have no life
Joined: May 2002
Posts: 21,653 |
Well I smell better. 
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
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Joined: May 2003
Posts: 5,621
Hard-core CEG'er
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OP
Hard-core CEG'er
Joined: May 2003
Posts: 5,621 |
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Joined: Jun 2003
Posts: 271
CEG\'er
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CEG\'er
Joined: Jun 2003
Posts: 271 |
Originally posted by Dan Nixon:
The 4-5 HP & torque seen by Ford Racing is pretty typical for UDPs.
Most of the power gain is via underdrive. The weight loss is less important because it is has small diameter (lower moment of inertia). 6 lbs lost here is less effective at freeing up power than a flywheel that is 3X the diameter. Also note that power gain will be more significant in lower gears, as benifits diminish with greater rotational inertia. There is an equation (where they discussed this in SCC about a year ago). A #10 lighter flywheel (on a zetec Focus) gained about 22 HP is 1st, about 9 HP in second, about 5 in 3rd, only 2 or so in forth. Sice we dyno in forth..that is all you will SEE when you dyno. But you will benifit from bigger power in low gears, percieved as faster reving. This is why flywheels are nice but a 6+ drop from a UDP would only see a small fraction of that gain.. probably only noticed in first gear .
Its a nice mod, unless it screws up your crank harmonics..
First gear is where i feel i need the most help.
1996 Zetec MTX
NO Mods it's only a matter of money now though.
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Joined: Aug 2001
Posts: 17,248
CEG road warrior
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CEG road warrior
Joined: Aug 2001
Posts: 17,248 |
Originally posted by fingas:
Originally posted by Dan Nixon:
The 4-5 HP & torque seen by Ford Racing is pretty typical for UDPs.
Most of the power gain is via underdrive. The weight loss is less important because it is has small diameter (lower moment of inertia). 6 lbs lost here is less effective at freeing up power than a flywheel that is 3X the diameter. Also note that power gain will be more significant in lower gears, as benifits diminish with greater rotational inertia. There is an equation (where they discussed this in SCC about a year ago). A #10 lighter flywheel (on a zetec Focus) gained about 22 HP is 1st, about 9 HP in second, about 5 in 3rd, only 2 or so in forth. Sice we dyno in forth..that is all you will SEE when you dyno. But you will benifit from bigger power in low gears, percieved as faster reving. This is why flywheels are nice but a 6+ drop from a UDP would only see a small fraction of that gain.. probably only noticed in first gear .
Its a nice mod, unless it screws up your crank harmonics..
First gear is where i feel i need the most help.
Not me. I need help in 2nd gear!  
Hector
2003 Rally Red Mitsubishi Evolution VIII
257HP/259TQ
2005 Lapis Blue Mazda 6s
RET: 00 Cabernet Red Ford Contour Zetec ATX SUPERCHARGED
160HP/141TQ
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