Why is it bad for clutch...

ftojeTDI · 14-10-2005, 15:40

Can someone explain me why is it bad to floor your tdi at 1000 rpm for clutch? I know it can also cause turbo surge when flooring below 1900 rpm but now im only interested why is it not good for clutch?

el richy · 14-10-2005, 15:46

Quote:

Originally Posted by ftojeTDI

Can someone explain me why is it bad to floor your tdi at 1000 rpm for clutch? I know it can also cause turbo surge when flooring below 1900 rpm but now im only interested why is it not good for clutch?

i would think that the judder that it produces would make the cluch bite harder if you are still puling away, but if you floor it with no cluch it wont do it any harm id imagin.

SteVRs · 14-10-2005, 15:55

The clutch is essentially two high friction surfaces that mate when you release the pedal - put too much torque through this coupling and the friction will be overcome and there will be clutch slip.

***DGW*** · 14-10-2005, 15:57

Short and to the point!

ScoobyChris · 14-10-2005, 15:57

If you're talking about traffic light grand prix starts, it's because the clutch has to "bite" for the engine to transfer drive to the wheels and you're making it harder to "bite" if the engine is spinning faster.

Same may be true if the clutch is already engaged, but I don't think the Fabia will pull that strongly from 1k rpm if you floor it so it shouldn't do anything to the clutch

Chris (not a mechanic!)

el richy · 14-10-2005, 16:09

Quote:

Originally Posted by SteVRs

The clutch is essentially two high friction surfaces that mate when you release the pedal - put too much torque through this coupling and the friction will be overcome and there will be clutch slip.

yeh what he said lol some people have a way with words lol

flatfourburble · 14-10-2005, 16:21

though shoud you really "floor it" from 1000 rpm? Does it not upset the flywheel aswell?

SteVRs · 14-10-2005, 16:52

Quote:

Originally Posted by DGW

Short and to the point!

That's what SWMBO said too

ftojeTDI · 14-10-2005, 17:46

to shorten this story is it bad to for clutch to floor it below 1900 rpm? I heard many times that you should always floor it when its above that rpm...

ScoobyChris · 14-10-2005, 17:53

Quote:

Originally Posted by ftojeTDI

to shorten this story is it bad to for clutch to floor it below 1900 rpm? I heard many times that you should always floor it when its above that rpm...

Because the engine is generating a lot of torque and the clutch will slip?

Chris

Shifty · 14-10-2005, 17:54

In all honesty, i think Skoda have thought of this and put a clutch in your car that meet the demands. Remapped cars can suffer quite badly from clutch wear.
As has been said, if the clutch is fully engaged, ie not setting off from a standstill, you should see no problems flooring it at 1000rpm, as your turbo wont be spun up by then anyway.

HTH

(I'm not a mechanic either)

.....new poll idea -"who is not a mechanic?"

Lummox · 14-10-2005, 18:18

Keep flooring it from low speed in high gear etc and your dual mass flywheel wont last long.

Shifty · 14-10-2005, 18:21

Quote:

Originally Posted by Lummox

Keep flooring it from low speed in high gear etc and your dual mass flywheel wont last long.

You ARE actually a mechanic....

Just on that subject, if I forget myself and hoof it under the 2k region, my 'box shakes. Flywheel? And what exactly is a dual mass flywheel, and can it be replaced with something lighter/stronger?

Lummox · 14-10-2005, 18:26

The dual mass flywheel is a two piece item with a shock absorbing silicone fluid between the two plates This absorbs vibtrations from the diesel engine and gives a smoother take up of drive and gear changes.

You can replace the flywheel with a single piece item. One of our SCN members who has a 230bhp Ibiza Cupra TDi has the full set (about £800 iirc) but it is noisy at idle as it chatters and the long term effects on the gearbox is as yet unknown.

***Neo_VR*** · 14-10-2005, 19:07

Quote:

Originally Posted by Lummox

The dual mass flywheel is a two piece item with a shock absorbing silicone fluid between the two plates This absorbs vibtrations from the diesel engine and gives a smoother take up of drive and gear changes.

You can replace the flywheel with a single piece item. One of our SCN members who has a 230bhp Ibiza Cupra TDi has the full set (about £800 iirc) but it is noisy at idle as it chatters and the long term effects on the gearbox is as yet unknown.

Yup... i agree (again) lol

its thought (in theory) having a single mass flywheel on a tuned tdi could destroy a gearbox very quickly... as the dmf kinda "absorbs" the shocks created by each cylinder firing on its own... without this, the shocks will be transferred to the gearbox, and eventually knacker the syncro on it.
theres very few people who use single mass flywheels on tdis... thats even including tdiclub!

Mark Pinder · 14-10-2005, 19:56

The load on the clutch is far greater at lower revs and road speed in the higher gears. The torque needed to accelerate the car is much greater in higher gears and puts far more strain on the clutch if the engine has to accelerate the car from low speeds in the higher gears. Think of pedalling a bicycle and trying to pull away or accelerate in a high gear, the engine, (you), has to put far more force onto the pedals and crank than is neccesary than if you'd accelerated up the gears.

devonutopia · 14-10-2005, 20:03

In terms of mechanics, I'm assuming that having an uprated clutch doesn't mean the flywheel is any different. Its just I've noticed this "juddering" when at low revs (not booting it, but making progress) I think it last happened when I attempted to accelerate briskly in 6th gear from about 1500rpm. - Its really got me thinking that ideally you don't want to be booting the car on WOT until around 1750rpm when boost is kicking in and the flywheel isn't having to cope with mega torque? (i.e shift down for bhp, not torque I guess?)

Anyone else have some good anti-judder advice except laying off the throttle at tickover?

14-10-2005, 15:40	#1
ftojeTDI Briskodian Join Date: Jan 2005 Location: Serbia Posts: 194 Members Car: 1.9 tdi elegance Thanks: 0 Thanked 0 Times in 0 Posts	Why is it bad for clutch... Can someone explain me why is it bad to floor your tdi at 1000 rpm for clutch? I know it can also cause turbo surge when flooring below 1900 rpm but now im only interested why is it not good for clutch?

14-10-2005, 15:55	#3
SteVRs Briskodian Join Date: Sep 2004 Location: Leicestershire Posts: 3,065 Members Car: Smart Roadster Coupe Brabus Thanks: 4 Thanked 19 Times in 11 Posts	The clutch is essentially two high friction surfaces that mate when you release the pedal - put too much torque through this coupling and the friction will be overcome and there will be clutch slip. __________________ Engined bike. Engined car. Neither a Skoda - been there, done that

14-10-2005, 15:57	#4
*DGW* BRISKODA Staff Join Date: Oct 2002 Location: Cambridgeshire Posts: 17,394 Members Car: Octavia 1.8T 4X4 Estate & Fabia vRS Thanks: 67 Thanked 223 Times in 168 Posts	Short and to the point! __________________ Denis 2002 Octavia 1.8T 4X4 turbo Estate - rebreathed on by Jabba ... 31.93mpg 2007 Fabia vRS - CC, ESP and full leather trim by Seat Surgeons ...48.12mpg...

14-10-2005, 15:57	#5
ScoobyChris Briskodian Join Date: Mar 2003 Location: Andover Posts: 18,265 Members Car: Fiat Panda Thanks: 16 Thanked 352 Times in 303 Posts	If you're talking about traffic light grand prix starts, it's because the clutch has to "bite" for the engine to transfer drive to the wheels and you're making it harder to "bite" if the engine is spinning faster. Same may be true if the clutch is already engaged, but I don't think the Fabia will pull that strongly from 1k rpm if you floor it so it shouldn't do anything to the clutch Chris (not a mechanic!) __________________ Holding up the traffic in a little Italian..........

14-10-2005, 16:21	#7
flatfourburble "Bones" Join Date: Jan 2004 Location: Heathrow/Crewe Posts: 5,449 Members Car: Fabia vRS Thanks: 0 Thanked 0 Times in 0 Posts	though shoud you really "floor it" from 1000 rpm? Does it not upset the flywheel aswell? __________________ Oh to have the internet back..................oh have I missed it

14-10-2005, 17:46	#9
ftojeTDI Briskodian Join Date: Jan 2005 Location: Serbia Posts: 194 Members Car: 1.9 tdi elegance Thanks: 0 Thanked 0 Times in 0 Posts	to shorten this story is it bad to for clutch to floor it below 1900 rpm? I heard many times that you should always floor it when its above that rpm...

14-10-2005, 17:54	#11
Shifty Ex Modder Join Date: May 2005 Location: Blackpool. Posts: 6,647 Members Car: Omega 2.5 V6 CDX Auto Images: 2 Thanks: 93 Thanked 177 Times in 112 Posts	In all honesty, i think Skoda have thought of this and put a clutch in your car that meet the demands. Remapped cars can suffer quite badly from clutch wear. As has been said, if the clutch is fully engaged, ie not setting off from a standstill, you should see no problems flooring it at 1000rpm, as your turbo wont be spun up by then anyway. HTH (I'm not a mechanic either) .....new poll idea -"who is not a mechanic?" __________________ <----- Add me on Xfire. Everyone knows someone called Dave. That's me - I'm Dave™

14-10-2005, 18:18	#12
Lummox Partner Join Date: Sep 2003 Location: Newport Pagnell Posts: 22,963 Members Car: Mk2 Golf GTi 16v and building a 20VT MK2. Images: 2 Thanks: 29 Thanked 831 Times in 699 Posts	Keep flooring it from low speed in high gear etc and your dual mass flywheel wont last long. __________________ www.unit18.co.uk Remapping Service now available, PM for details.

14-10-2005, 18:26	#14
Lummox Partner Join Date: Sep 2003 Location: Newport Pagnell Posts: 22,963 Members Car: Mk2 Golf GTi 16v and building a 20VT MK2. Images: 2 Thanks: 29 Thanked 831 Times in 699 Posts	The dual mass flywheel is a two piece item with a shock absorbing silicone fluid between the two plates This absorbs vibtrations from the diesel engine and gives a smoother take up of drive and gear changes. You can replace the flywheel with a single piece item. One of our SCN members who has a 230bhp Ibiza Cupra TDi has the full set (about £800 iirc) but it is noisy at idle as it chatters and the long term effects on the gearbox is as yet unknown. __________________ www.unit18.co.uk Remapping Service now available, PM for details.

14-10-2005, 19:56	#16
Mark Pinder Briskodian Join Date: Aug 2005 Location: North East England Posts: 19 Members Car: Thanks: 0 Thanked 0 Times in 0 Posts	The load on the clutch is far greater at lower revs and road speed in the higher gears. The torque needed to accelerate the car is much greater in higher gears and puts far more strain on the clutch if the engine has to accelerate the car from low speeds in the higher gears. Think of pedalling a bicycle and trying to pull away or accelerate in a high gear, the engine, (you), has to put far more force onto the pedals and crank than is neccesary than if you'd accelerated up the gears.

14-10-2005, 20:03	#17
devonutopia Mongreller Join Date: Apr 2003 Location: Exeter / Devon Posts: 30,490 Members Car: Skoda Fabia Mongrel Images: 5 Thanks: 79 Thanked 381 Times in 322 Posts	In terms of mechanics, I'm assuming that having an uprated clutch doesn't mean the flywheel is any different. Its just I've noticed this "juddering" when at low revs (not booting it, but making progress) I think it last happened when I attempted to accelerate briskly in 6th gear from about 1500rpm. - Its really got me thinking that ideally you don't want to be booting the car on WOT until around 1750rpm when boost is kicking in and the flywheel isn't having to cope with mega torque? (i.e shift down for bhp, not torque I guess?) Anyone else have some good anti-judder advice except laying off the throttle at tickover? __________________ Jason - Only a Skoda. Custom Fabia Bonnet Lifter Kits - £45! Click Me. BRISKODA CLUBSTAND @ Castle Combe! 25/04/09! Track session too! Click me! See the mongrel's 260bhp Dyno Video!

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