Omega Owners Forum
Chat Area => General Discussion Area => Topic started by: IrmscherKris on 06 September 2007, 21:46:26
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I got on the loud pedal today in the MV6 round snake pass (A57) and was quite impressed! :)
It's got a superchip and full de-cat, I'm thinking the next step is to get the flywheel lightened.
Whats the standard weight of the flywheel and does anyone have an opinion on how light to go. This is a daily driver so cant go too light or I will probably end up killing myself!
(http://i49.photobucket.com/albums/f270/wrxkris/Image109.jpg)
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I got on the loud pedal today in the MV6 round snake pass (A57) and was quite impressed! :)
It's got a superchip and full de-cat, I'm thinking the next step is to get the flywheel lightened.
Whats the standard weight of the flywheel and does anyone have an opinion on how light to go. This is a daily driver so cant go too light or I will probably end up killing myself!
(http://i49.photobucket.com/albums/f270/wrxkris/Image109.jpg)
Not sure how easy, as they are dual mass....
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my experience of lightened flywheels on V6s is with FWD applications.
I have used a 2.0XE flywheel on a V6 in the past, ther weight difference is massive, to the point that the engine spins up so much faster and coupled with a lightened bottom pulley, 3.0 cams, modified throttle body and a few other tweaks the difference was phenominal
I dont know if the Xe flywheel would work in a RWD application it would depend on dimensions, one thing is sure, you would need to have a different clutch fitted as well
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Dual mass - tut! Nothing is ever easy, is it?
It would be worth looking in to standard flywheels I suppose - could work out nice and cheap!
I found out the standard weight is 15kgs!!!! :o So with that in mind 10kgs would be sweet.
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Any chance of a numpties guide to what this is all about?
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It's official Kris, I LOVE your car :D
Well chuffed you've managed to resurect it from the dead! Is it tip-top now then? Did it have MOT when you bought it? Presumably the exhaust is a bit of a swap out so it passes the test?
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COURTENAY (http://www.courtenaysport.co.uk/) do a lightened fly wheel, that weighs 5.6kg :o
It does say diff clutch and bolts are required for Omega and they want £275 plus fitting!!!!
Best bet is to start with a chat with them before you 'play' with your one, but iirc a lighter fly wheel makes for 'jerky' driving in traffic so if its a daily driver it may make it 'uncomfortable' to drive
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You need to start from a front wheel drive V6 solid flywheel AND you need th associated clutch friction plate....
Heres one to ponder though....and I know the answer but food for thought.
How can a lightened flywheel (maybe 10Kg lighter) help an engine spin up faster when the engine is connected via a gearbox and diff setup to a 1700Kg car....
Food for thought.
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How can a lightened flywheel (maybe 10Kg lighter) help an engine spin up faster when the engine is connected via a gearbox and diff setup to a 1700Kg car..........
With great difficulty? :y
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davlad22 - still some niggly bits to do (climate bulbs, front alloys need a refurb, various small scuffs and scratches and my brother-in-law owes me a blast over but yeah, I'm pretty happy with it now :y )
Phil - very very very pricey, had a look at this last night - it's £275 plus their clutch and bolts (£250-300?) even doing the work myself, which I will... I'll be looking at £5-700 sheets. I could never justify spending so much on a cheap motor.
Mark - HIT ME! ;D
I assume cos... it's right on the crank? I know it will never take off like a 4wd car either but that edge faster than it is now would be nice. I thought of getting an LSD diff but that kills the acceleration so thats out the window too.
Muchas appreciated guy's :y
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You need to start from a front wheel drive V6 solid flywheel AND you need th associated clutch friction plate....
Heres one to ponder though....and I know the answer but food for thought.
How can a lightened flywheel (maybe 10Kg lighter) help an engine spin up faster when the engine is connected via a gearbox and diff setup to a 1700Kg car....
Food for thought.
Angular momentum is more work to spin up.
Get two car wheels
One on a grippy slide so it turns
Other on an icy slide so it doesn't
Since it takes energy to accelerate the spin on the wheel it goes slower.
Did this at A level Physics
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Well my Sunbeam had a great big heavy flywheel and that did not rev quickly, despite the increased power and high lift cam. I reckon a lighter flywheel would have made it a lot revvier - and knocked maybe 1/2 second off the 0-60
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Martin....do you REALY think that shaving 10 Kg off a flywheel will make a 1700Kg car accelerate faster.....come off it!
The limiting factor is the engines power and the most significant contributing factor is the vehicle weight.
It will make the engine spin faster if it neutral.
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.....It will make the engine spin faster if it neutral.
.... or slow down quicker. :D
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Mark - What do you recon then? (as in a power increase)
I can't see somewhere like courtenay selling a lightened flywheel that doesnt do anything
it just doesn't seem right....
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In my interpretation, it will provide an increase in available power. Simple physics, as its less metal to get spinning thus making more of the engines power output available for other things i.e. moving the car along the road.
The main rub, however, is how much power is now released and what effect, if measurable, will that have on a car not far short of 2 tonne?
If the car were stripped out to the most basic of running shells then perhaps an increase would be detected when driving but if retained as per factory standard, I doubt it would only be seen on a dyno.
2p :y
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I agree with Mark, it won't make the car accelerate noticably faster because the power/weight ratio is too low. A car that weighs 1700 Kg with only 210 BHP driving it is never going to be particularly fast. A lightened flywheel is only likely to produce a noticable difference when it's a light car, such that the angular inertia of the flywheel becomes a significant proportion of the mass of the car.
It'll definitely help with the responsiveness when the drive is disengaged, I find the Omega engine is particularly poor in this respect, if you blip the throttle with the clutch down (say on a downshift) the revs hardly rise at all. You have to hold the throttle open for a second or so to give the revs time to catch up. That I suspect is largely due to the heavy flywheel. It doesn't really matter much as the pedal layout is crap so it's near impossible to heel-toe effectively anyway.
Personally I wouldn't bother. Oh and the reason Coutenay sell them is because there's demand -- i.e. they can make money doing so ;)
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Martin....do you REALY think that shaving 10 Kg off a flywheel will make a 1700Kg car accelerate faster.....come off it!
The limiting factor is the engines power and the most significant contributing factor is the vehicle weight.
It will make the engine spin faster if it neutral.
Only a tiny bit - probably not worth doing, but if you were chasing tenths would be worth doing once you have shifted a lot of weight.
Other slow downs are heavy wheels, & prop shafts.
All this rotating stuff does take power to spin up.
Not much on a percentage way but if you want to chase it there it is.
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.....It will make the engine spin faster if it neutral.
.... or slow down quicker. :D
This is what I found - bike engines with basically bugger all flywheels change revs almost instantly*
* Except ones with heavy balancer shafts ect
Also due to the TC I would say that autos have less effect from flywheel mass, as they don't have to keep making rapid RPM changes.
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Mark - What do you recon then? (as in a power increase)
I can't see somewhere like courtenay selling a lightened flywheel that doesnt do anything
it just doesn't seem right....
What I am saying is that it does, and Mark is saying that in the context of things it would make minimal difference.