How much will I gain with a light flywheel ? - Ford Mustang Forum
 
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post #1 of 9 (permalink) Old 05-20-2005 Thread Starter
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How much will I gain with a light flywheel ?

I dont have the jegs in catelog right in front of me but I seen a flywheel in there for $300-400 bucks and says it takes the stock flywheel 30-40 horses to move and only 15hp to move this lightweight one. So does that mean I will be gaining 25-30hp at the wheels if I buy this flywheel or is this just a bogus claim just to sell the product.

91 Mustang 5.0 with a K&N,headers, H-Pipe, flowmasters and 4.10 gears.
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post #2 of 9 (permalink) Old 05-21-2005
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Gimmicks. You dont need a light flywheel right now.

89 GT Hatch: Custom M90 Supercharged w/ Ported Trickflow Trackheat Heads, Stage 1 cam, Streetheat lower / Sheet metal upper, Tweecer RT & PLX Wideband, 75mm TB, 1.6 Roller rockers, 3.73s, MSD 6a, Canton 7qt Pan+ Windage tray, 36LB Injectors, 200 amp Alternator, 75mm Pro-Mas MAF, 190lph fuel pump,Spec Stage 1 Clutch,SouthSide LCA's, Pro 5.0 Shifter, Steeda CC Plates / Springs, FMS Aluminum Driveshaft, New T5 w/ 2.95 first gear, Underdrive pullies, Zirgo 3300Cfm Elec. Fan, AFCO alum. radiator
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post #3 of 9 (permalink) Old 05-21-2005
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wont a lighter flywheel help your engine to come down from a rev faster though? I mean when you rev it to say 5000 RPMs, wouldnt it drop faster? It seems to me that our 5.0L's are a little slow to come back to idle... Is this true?

Cardinal Red '88 GT 5 speed, 99 Contour Electric Dual Fans, Battery relocated, 130 amp alternator, 76mm Mass Air conversion, 75mm BBK throttle body, 5.0L .030 over, BBK SSI, AFR 185cc heads, Comp Cams XE276HR, BBK ceramic longtubes, Spec Stage II clutch, MM front/rear coil overs, MM front LCA's, MM manual brake conversion, Flaming River Manual Rack, 94-04 Cobra front brakes, 99 Cobra IRS, Torsen T2R differential, 3:55 gears
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post #4 of 9 (permalink) Old 05-21-2005
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Yes they are a little slow to drop back down to idle but I dont believe it has anything to do with the flywheel. The motor was designed this way. (Its even worse with an auto) The same thing occurs with the 4.6.

There are restrictor plates that can be placed at the IAC to help drop the rpms a little quicker, but I dont know how well they work.

1995 Mustang GT 5.0
BBK CAI, Pro-M 75mm MAF, Pro-M Optimizer, BBK 70mm TB, GT-40 Intake, 24# Injectors, AFR 165's, 1.7 Roller rockers, Crane 2040 cam (E-303) BBK Equal Length headers, BBK O/R X-pipe, Flowmaster American Thunder 2 Chambers. FMS 3.73 Gears, Lentech AODE 2800 stall, BBK 255lph Fuel Pump, BBK Fuel Pressure Regulator. MSD 6AL, Steeda UDP's, FMS Aluminum drive shaft, Autologic chip Larocca tune.
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post #5 of 9 (permalink) Old 05-22-2005
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Why did they design it this way? What is the benefit of having the engine drop slowly? It drives me crazy when I shift without the clutch, because sometimes it takes way to long for the engine to come down to the correct RPM's...

This is off topic, but I just noticed that the ice cream man is driving past my apartment at 2:00 a.m. Can anyone say creepy...????

Cardinal Red '88 GT 5 speed, 99 Contour Electric Dual Fans, Battery relocated, 130 amp alternator, 76mm Mass Air conversion, 75mm BBK throttle body, 5.0L .030 over, BBK SSI, AFR 185cc heads, Comp Cams XE276HR, BBK ceramic longtubes, Spec Stage II clutch, MM front/rear coil overs, MM front LCA's, MM manual brake conversion, Flaming River Manual Rack, 94-04 Cobra front brakes, 99 Cobra IRS, Torsen T2R differential, 3:55 gears
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post #6 of 9 (permalink) Old 05-22-2005
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If you install a lighter flywheel, your engine rpm will drop faster than with the stock flywheel, same thing apply's with lighter pistons or any other rotating part. But, on the other hand it will rev up faster, which enables you to shift to the next gear sooner. Less rotating mass makes for a faster revving engine. :thumbsup I would say the ice cream man is on Meth!!

1992 LX hatchback, with 93' Cobra Motor and 5 speed,cobra intake(ported lower),GT-40 iron heads,FMS 65mm TB,F-303 cam,C&L 73mm mass, 24lb inj.,walbro 155fp,adj. reg,12" K&N cone,BBK short headers,BBK H-pipe, Flowmaster 2 chamber cat back,Eibach pro springs,17" cobra R rep. wheels, 245/45 front, 275/40 rear, goodyear eagle GSC's.
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post #7 of 9 (permalink) Old 05-22-2005
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Im sure there are some trade off's, you might want to look a little deeper into this.

1995 Mustang GT 5.0
BBK CAI, Pro-M 75mm MAF, Pro-M Optimizer, BBK 70mm TB, GT-40 Intake, 24# Injectors, AFR 165's, 1.7 Roller rockers, Crane 2040 cam (E-303) BBK Equal Length headers, BBK O/R X-pipe, Flowmaster American Thunder 2 Chambers. FMS 3.73 Gears, Lentech AODE 2800 stall, BBK 255lph Fuel Pump, BBK Fuel Pressure Regulator. MSD 6AL, Steeda UDP's, FMS Aluminum drive shaft, Autologic chip Larocca tune.
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post #8 of 9 (permalink) Old 05-23-2005
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yeah Ive been kind of curious about this for a while, because I want a faster revving car. Its not a big deal or anything, but you know what I mean. I just get a little annoyed watching the RPM's kind of drop, pause, drop, pause...idle. You know what I mean.

Cardinal Red '88 GT 5 speed, 99 Contour Electric Dual Fans, Battery relocated, 130 amp alternator, 76mm Mass Air conversion, 75mm BBK throttle body, 5.0L .030 over, BBK SSI, AFR 185cc heads, Comp Cams XE276HR, BBK ceramic longtubes, Spec Stage II clutch, MM front/rear coil overs, MM front LCA's, MM manual brake conversion, Flaming River Manual Rack, 94-04 Cobra front brakes, 99 Cobra IRS, Torsen T2R differential, 3:55 gears
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post #9 of 9 (permalink) Old 05-23-2005
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With the lighter flywheeel, it stores less energy than a heavier flywheel and tends to bog down a whole lot more than heavier flywheel. This argued about a lot and magazines have done dynos showing the heavier flywheel is better down low and the lighter is better from mid to higher basically. I would install it on my car if it was given to me, but they are a lot of $$ if you dont really need it just quite yet.

You will have to drive the car differently with a lighter flywheel.

89 GT Hatch: Custom M90 Supercharged w/ Ported Trickflow Trackheat Heads, Stage 1 cam, Streetheat lower / Sheet metal upper, Tweecer RT & PLX Wideband, 75mm TB, 1.6 Roller rockers, 3.73s, MSD 6a, Canton 7qt Pan+ Windage tray, 36LB Injectors, 200 amp Alternator, 75mm Pro-Mas MAF, 190lph fuel pump,Spec Stage 1 Clutch,SouthSide LCA's, Pro 5.0 Shifter, Steeda CC Plates / Springs, FMS Aluminum Driveshaft, New T5 w/ 2.95 first gear, Underdrive pullies, Zirgo 3300Cfm Elec. Fan, AFCO alum. radiator
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