Keith Mac Posted January 23, 2019 Share Posted January 23, 2019 Hi,I'm considering replacing the standard flywheel on my Roadsport (150 Sigma) for a lightened alternative and would be interested in hearing any views - positive and/or negative - about this conversion.I know that it should make it easier to reach maximum revs, but on the down side, make it more 'fiddly' in traffic - especially as I have throttle bodies fitted.Is it worth the pain for the return??.Many thanks, Keith Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted January 23, 2019 Leadership Team Share Posted January 23, 2019 Just do it, there won't be any pain at low revs because you'll soon get used to it. A heavy (standard) weight flywheel really numbs the responsiveness of the engine.Stu. Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 23, 2019 Share Posted January 23, 2019 I've had two cars with lightened flywheels - a 1380 mini (classic not BMW) and my seven, and both transformed the 'perceived' acceleration! I think being a petrol head you have the understanding and willingness to deal with the compromise that such a modification brings. I just give it a few more revs when pulling away in traffic. Do it!!Ian Link to comment Share on other sites More sharing options...
ChrisC Posted January 23, 2019 Share Posted January 23, 2019 I had the CC lightweight flywheel on my Sigma150. No problem in traffic, and pulled clean in any of the 5 gears from 1100 rpm.As Stu said Just do it Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted January 23, 2019 Leadership Team Share Posted January 23, 2019 Ian, you've just cost me more money ... I now need a lightened flywheel for when I do the clutch on the Mini!!! Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 23, 2019 Share Posted January 23, 2019 make sure its EN40B - just check out the alignment of the flywheel with your crown jewels Ian Link to comment Share on other sites More sharing options...
Eccles Posted January 24, 2019 Share Posted January 24, 2019 Are there any write-ups of doing the flywheel swap on a Sigma?Ivan Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 24, 2019 Share Posted January 24, 2019 Eccles,Most tintop haynes manuals will tell you how to remove and refit a flywheel. Just find a ford car manual that uses the same engine.- Engine out- Gearbox off- unbolt clutch cover (check whether new bolts needed). Remember which side of friction plate faces flywheel & check for wear.- Lock flywheel and unbolt (usually new bolts needed)- Fit new flywheel (sometimes new bolts come preloaded with loctite but if not check if needed) and torque up bolts as per manfacturer specification- Refit clutch - ensure friction plate centred else you wont get gearbox back on. Torque bolts.- Check / replace thrust bearing (K series were prone to failure due to insufficient bearing pre-load so were classed as a service item whenever in bits!) Reassembly is the reverse of disassembly. Link to comment Share on other sites More sharing options...
Mrp Posted January 24, 2019 Share Posted January 24, 2019 Dear KeithI have one that was supposed to be for a 2009 Sigma, if you are interested.Mrp Link to comment Share on other sites More sharing options...
Eccles Posted January 24, 2019 Share Posted January 24, 2019 Thanks Wrightpayne, it would be the biggest job I have undertaken for a while so convincing myself I can do it!! Ivan Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 24, 2019 Share Posted January 24, 2019 Ivan,I'm sure there will be a fellow sevener local who will be able to help / offer guidance.Its the list of other stuff to do whilst the engine is out that takes the time!RegardsIan Link to comment Share on other sites More sharing options...
mossy7 Posted January 24, 2019 Share Posted January 24, 2019 Stuart at Premier Power has championed the Ultra light fly wheel and clutch for the Sigma for several years now. His current version is more than 2.5 kg lighter than CCs own lightweight flywheel/ clutch set up and he says a Sigma 125 bhp feels quicker fitted with one than a standard Sigma 140 Supersport. On a 150 Sigma it's going to be impressive. Guess it's down to the razor sharp throttle response you get. It also happens he now does a Ultra lightweight flywheel and clutch for the Duratec. Now that's an interesting and potentially great first upgrade for my 360R. I'm looking at the piggy bank right now! Link to comment Share on other sites More sharing options...
p.mole1 Posted January 24, 2019 Share Posted January 24, 2019 It will transform the car, just make sure you get one from a reputable supplier. Many years ago when I used to have Mini's the A series ones, my friends lightened standard flywheel exploded and is was like a bomb going off completely destroyed the transfer case,drive shaft, huge dints in bonnet, and subframe. Luckily none of the shrapnel came through the floor. Link to comment Share on other sites More sharing options...
Keith Mac Posted January 24, 2019 Author Share Posted January 24, 2019 Thanks Folks - I think the consensus is that is something worth doing and you have certainly helped me make up my mind. I'll have a butchers at the Premier Power take on the subject along the way..... Link to comment Share on other sites More sharing options...
Area Representative Kingsley Young Posted January 24, 2019 Area Representative Share Posted January 24, 2019 KeithI have a 150 SV, and last winter I had a lightened Flywheel fitted.I purchased the Flywheel from TTV Racing at Copdock near Ipswich, the saving was 4.5kg off the standard Flywheel, I had Team Leos fit it for me, it has totally transformed the car without any issues. Go for it. Kingsley Link to comment Share on other sites More sharing options...
Keith Mac Posted January 25, 2019 Author Share Posted January 25, 2019 Thanks Kingsley,Mine is an SV too - looking at all of these positive responses, I'm quite excited about the prospect of the conversion to be honest!!K Link to comment Share on other sites More sharing options...
nickh7 Posted January 25, 2019 Share Posted January 25, 2019 Can’t say what’s it’s like on a sigma but it’s brilliant on a k , revs come and go really quickly. JDFI Link to comment Share on other sites More sharing options...
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