lightened fly wheel

livi150

guys anyone got a lightened fly wheel on their 2.2.
was looking at them but want some feedback first

vocky

they allow the engine to rev better, but I won't be fitting one because:

If you have fitted uprated cams, you can't fit a lightened flywheel, as it would cause knock sensor errors :cry:

JohnnyN

It does allow the engine to rev easier and its more economical in town driving, but you'll find that fuel consumption increases on motorway driving etc. due to the fact that the weight reduction means you have to keep the gas on to keep the innertia going, if you know what I mean.

notsure.gif

Gazza

i was going to have one fitted but i decided not to in the end you wont feel alot of differance for the price you will pay and like johnny said will cost more to run in fuel,that's what i was told when i was looking into it anyway 😃

Lightning_Coupe

vocky said:
they allow the engine to rev better, but I won't be fitting one because:

If you have fitted uprated cams, you can't fit a lightened flywheel, as it would cause knock sensor errors :cry:

Theres a lad in my vxlscc region whos got both a lightweight flywheel and debias cams fitted and his hasnt thrown any knock sensor faults up.

coopa

JohnnyN said:
It does allow the engine to rev easier and its more economical in town driving, but you'll find that fuel consumption increases on motorway driving etc. due to the fact that the weight reduction means you have to keep the gas on to keep the innertia going, if you know what I mean.

notsure.gif

I'm surprised at that. what..

Rotational Inertia has no effect unless it being accelerated (or decelerated). Rotational inertia doesn't even care if you are going up or down a hill as a static inertia (such as the mass of your car) would. The losses in a rotational system such as that tend to derive from from either bearing friction (which I thought yould be unaffected by lightening the flywheel), or windage losses, which also are probably only affected slightly.

Still if someone has done a proper fuel consumption test (with no other mods except the weight of the flywheel) then I'm happy to accept empirical research. notsure.gif

coopa

vocky said:
they allow the engine to rev better, but I won't be fitting one because:

If you have fitted uprated cams, you can't fit a lightened flywheel, as it would cause knock sensor errors :cry:

Really?

Have you experienced this first hand?

I only ask as a flywheel and cams are my next mod, several VX's have them, but I don't want to make a mistake!

vocky

the guys in the usa figured it out, I've not tried it personally as it's too much hassle fitting then removing a flywheel

basically the cams give a lumpy tickover and with a lightened flywheel the engine rocks and the knock sensor can pick it up and cause limp-mode

cicastol

vocky said:
the guys in the usa figured it out, I've not tried it personally as it's too much hassle fitting then removing a flywheel

basically the cams give a lumpy tickover and with a lightened flywheel the engine rocks and the knock sensor can pick it up and cause limp-mode

Knock sensor problem where experienced by some americans,but they have a different ECU!!
My VX is equipped with an ultralight 3,4Kg fidanza flywheel and 267Â°cams,absolutely no strange lumpy tickover noise and no knock sensor problem..... valvetrain noise was not changed after the flywheel or cams installation.