lw fly wheel's - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 07-06-2004, 11:06 PM
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For a 94 325, i know the benefits of a light weight fly wheel are in acceleration etc, but i was thinkin and i realized i didnt really know why. could anyone explain to me why a lwfw is beneficial to performancE?

also, what are good makes and whats a reasonable cost?? an overveiw of cost/benefits/makes/performance would be great :lol:

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#2 (permalink) Old 07-06-2004, 11:11 PM
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Basically it's just easier for the engine to spin. It doesn't have to turn that extra 20 lbs or so and becomes easier for it to rev up.

But on the flip side that extra weight isn't there to carry the engine around for the next power stroke so the revs drop quicker.

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#3 (permalink) Old 07-06-2004, 11:12 PM
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pros- reduces the weight of the flywheel so that the car doesnt have to work as hard to turn the driveshaft, lightening anything that affects the engine in a negative way with weight, will allow the engine to free up hp (not gain)

cons-makes it a little difficult to drive the car in stop in go traffic, from what i hear, the car becomes hard to get off the line, because the car feels like it wants to stall a lot more easier...


(sorry for dumbing it down and all that bad grammar)

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#4 (permalink) Old 07-06-2004, 11:14 PM
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LWFWs have less rotational mass. less mass=less work=more potential energy. Because it weighs less, the engine doesn't have to work as hard at a given RPM to produce the same power output, meaning that while the engine ins't really producing any extra HP, more HP is getting to wheels.

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#5 (permalink) Old 07-06-2004, 11:21 PM
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thanks for the replies. thats what i figured, sounds like you could relly fudge up alot of things by messing around with it.

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#6 (permalink) Old 07-07-2004, 02:54 AM
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It is very noticable on cars with 'norrow' torque curves as it sometimes has a negative effect on the cars general performance.

Lightened fly wheels are really a mod for modified engines and shouldn't be one if the first things to get done.

Spend the money on some performance cams instead.

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