|
I don't think its this is something you can do an apples to apples comparison on. On one hand a heavier flywheel will always require more energy to accelerate to the same rpm, but on the other hand the flywheel is also needed for low rpm operation. and changing the flywheel changes how you drive the car. Its a trade off that depends on driving conditions, driving style, engine and gearing. For example if you are in stop and go traffic or you pulse and glide the lighter fly wheel will save you energy when accelerating. However I do a lot of low rpm cruising and never rev above 3000rpm, so if I had a lighter flywheel I wouldn't see the energy savings form accelerating but my little 3cyl wouldn't be able to chug along at 1000rpm and I would have to rev it higher to shift through the gears and also raise the idle speed, so in my case I wouldn't see the same benefits only the drawbacks.
Another thing to consider is that if you have a lighter flywheel and need to rev the engine higher and slip the cluch more jsut to launch you might be using the same energy as you would if you launch from a lower rpm with a heavy flywheel.
As for the dyno test showing hp gains. It should show hp gain's when doing a dyno pull because the engine is quickly accelerating to the redline, the heavier flywheel takes more energy to accelerate and hp is the rate of energy output. so the faster you rev up the engine, the more hp is required. If you could test hp at a constant rpm you would see no significant difference.
Sorry for not giving any verified yes or no answers, But I think theirs to many variables for that.
|