RS 250 Lightweight Flywheel.

Exhaust not re secured properly ?

 

Speak to Jamie, he's the only other member I know of who has replaced the DMF with single mass and I think he reported some unfamiliar sounds too.

 

Yea Jamie would know, his did sound quite rattly on idle last time I seen him.

 

-Jamie- I think

 

Lightweight Flywheel,is a useful thing especially used in R26,good to talk about that,well in our area its not used but its a good concept ,i think other companies may get introduced these Flywheel later on.

 

I have also the lightweight flywheel in my 250. The noise grow more and more with time/milles. Also the shifts arent good.

Sorry for by english.

 

I would imagine it gives quite a benefit though as the OEM setup is very lazy revving.

 

It's a horrible modification, if you can even call it that. IMO of course

 

What's the downsides mate?

 

The rattles and vibration it causes. Not to mention the stress on the crankshaft.

 

It's not internet hearsay, it rattles, vibrates and causes extra stress on the crankshaft regardless of failure.

 

I havent had any issues on my r26 with SMF.

I can see both side of the arguement here regarding crank stress, but I must add that some engines runing insane power dont seem to have the crank warp / bend / fall to bits.

 

I totally agree with this and I would never say DONT put one on, at the end of the day it's personal choice but for me it's just not something I'd ever do just because of the noise that comes with it.

 

You know what, I've always assumed that the noise I get from around 3000rpm to 2000rpm on overrun was the input shaft bearing rattling - turns out it might be the SMF I've got!

 

Other than the r26 starting up ( where I get a metallic clink ) there is no extra noise for me !

 

On the 250/265 it sounds worse than. Diesel constantly

 

On the 250/265 it sounds worse than a diesel constantly

 

A diesel sound better than my 250 with light weight FW

 

Haha brilliant.

 

Keep us informed please

We have changed the gearbox for another used one and sounds same.

 

Rs 265 SMF noise and vibration

I had a SMF installation undertaken owing to a very rattly DMF from new, Renault supplied the labour & I supplied the SMF and a standard clutch kit.

The results Performance wise was all I expected, however there is no way this installation over time will not impact on the drive train components downstream from the clutch.
Every bit of harmonic vibration is passed into the drive train, The standard clutch plate center is "unsprung" with very light attachment material to the center spigot
and the standard clutch cover is not intended for the transmission of this level of vibration through it. Consequently the harshness and noise is alarming to say
the least. If you have access to these OEM parts, examine them and give them a bit of a tap and shake and you will understand whats going on here, these are low
cost, mass made products that are engineered to run with a DMF that smooths out all this crap, that's why its there!

End result for me I had them immediately pull the gear box and reinstall a new DMF supplied by the warranty, but this labour was then at my cost!

The UK made SMF flywheel most readily available is a good piece of gear, however speak to any specialist clutch manufacturer and they will tell you, not to run
an unsprung clutch plate (such as the OEM item is) with out a specialist clutch cover, even then that is going to be harsh but nothing like as I describe above, and is
realistically a motorsport setup.

I am going to reinstall the SMF when I eventually have available a sprung Clutch Plate and Clutch Cover made for the job that also offers a higher torque rating
capability. I am informed this is a work in progress that should be available as a complete package of SMF and complete clutch kit.

All I can say is if you want a light and responsive flywheel, research it and do it properly, I made this mistake, and I know there are others also, however there was no way
I could handle such an improperly engineered set up.

Cheers

 

Exactly grlyd. I have kept wondering for a long time why 'renowned' shops of aftermarket parts sell SMFs and keep up the story that it is no problem to run such flywheels with the original unsprung clutch plates. If you want to kill your drivetrain, you should indeed do that.

Good news though, I have found a German handler that finally lists sells Helix SMF + sprung clutch plates for the RS250/265 (http://www.ktk-motorsport.de/shop/show_product.php?products_id=1947). Took them friggin' long enough! Still don't get it why parts such as sprung aftermarket clutch-plates have not become more readily available almost 6 years after the launch of the Meg 3 RS.

 

Isn't that very expensive? Or is that just the going rate for this kind of thing?

 

Cheaper than the uk

 

Hello TymenJ,
Did you install the Helix SMF + sprung clutch plates from ktk-motorsport, If so I would be very interested to hear your experience with this product and the company. I missed your reply when you posted it so my apologies for taking so long.

Regards

 

I don't see the point of a sprung plate when running decent amounts of torque

You're then asking the springs to take the forces.

How long will the springs last?

I'm yet to find anyone recommending that setup on my reading around the subject

 

If you run a SMF, you need to run a sprung plate. Someone needs to pick up the vibrations and harmonics. The sprung plate springs are usually tougher than DMF springs.
If you go SMF and unsprung plate, you are really looking for trouble.

S.

 

I agree SMF and single plate clutch is nuts. However I disagree that a sprung plate is a suitable option - I think if you run an SMF with high amounts of torque, you need a multi-plate clutch.

I've contacted a few makers of clutches and all have said they wouldn't want to use sprung plates. To support that, I've seen a number of forums where people have had to get the gearbox out in order to replace springs... a ton of labour just to swap a known weak point.

The issue, I believe, with the Megane gearbox is that there isn't lots of room to fit a twin plate clutch in the housing. The flywheel needs to be made a bit thinner in order for it to fit.

 

Let's first see what high amounts of torque means and then if you can really use that torque in a FWD car for other thing than dyno bragging, gearbox crunching or axle twisting. I believe the first part of the question stays here.

Second, is something I'm saying for a while, the first move should be towards a 250mm clutch. Flywheel can take that (175dCi) and also you have a ready available clutch cover (175dCi).

Going to a twin disc unsprung clutch with SMF is going to be a dog to drive anywhere else than the drag strip and somehow I don't see the reason for something like this.

So, are people really slipping clutches that badly and not the wheels?
S.