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... A few important things come into play going down the track
that you can't easily get from the dyno data: shift lag, inertia, and
acceleration. For example, you spend much less time in 1st gear (you
accelerate through 1st quickly), so you can tolerate being out of the torque
band in first gear without serious e.t. losses. The other issue is how
much energy (flywheel) is being transmitted to the next gear on the
shifts. Back to our first gear example, if you intentionally delay the 1-2
shift, you can hit 2nd gear with more stored energy, and probably not
suffer on the e.t. significantly by being beyond the torque in 1st gear
for a fraction of a second. But if you're slow to shift, you'll lose
that energy.

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I would NOT recommend an Aluminium flywheel with a near stock engine, in a near stock weight Mustang. The car will not only give up significant launch potential, but it will also lose energy on the shifts.

Logically, you might expect the MPH to go up with the Aluminium wheel (less rotating inertia) even if the ET suffers from a softer launch, but my testing showed the Aluminium wheel to give up BOTH ET and MPH. This clearly showed how the steel wheel holds RPM through the powershifts significantly better, in addition to the harder launch.

And just FYI, with around 290 rwhp, my car 60 foots in the low 1.5's, with a steel flywheel.

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I tried to give you guys cliff notes

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Originally posted by st5150:
Lighter flywheel = bad for drag racing (on slicks and/or powershifting)

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I think that has everything to do with NMRA cars which drag race and powershift.

Also I seriously doubt Glenns car is "near stock" with 300rwhp.

[ July 02, 2003, 03:04 PM: Message edited by: Jeff S ]

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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG

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Originally posted by st5150:
Blown GR40 Mystic & Jeff S Its amazing what you guys have leared watching street races and talking "tech" about cars in parking lots every saturday night. Should I re-post my last post again, or can I trust you two to scroll up and read the 290 rwhp part for yourself?

Last time I checked, NMRA cars have next to nothing in common with Glenn's car or 3,004 other CaliforniaFords.com member's cars

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