Hi Guys,

My clutch has just been replaced after it started slipping in 3th, 4th and 5th gear after the remap.

It doesn't slip anymore, but the car can be vibrating really bad if I pull down the pedal at 1500rpm in 3th/4th/5th gear. The gears don't go up but it judders like hell.

Is my Dual Mass Flywheel breaking apart, or could it be that I got a lousy remap which doesn't have the right torque-limiting settings at the lower revs?

Thanks,

Wessel

Have you got a torque graph?

no sorry no rolling road test.

Could it be the "fingers" of the pressure-group who start slipping?

It's only when the torque is at max at low RPM's. In the lower gears the car just accellerates and nothing vibrates.

It's your DMF destroying itself. That's because the peak torque is all going through the DMF at that 1500rpm.

The remap could be kinder to the DMF but hten you will end up with a lot less overall torque/power. To be honest the biggest issue is how you drive, you need to drive remapped car differently to a standard one. Drop a cog and stop killing it!

So the torque limiter is not rev-dependant? If it is we could remap the car so it doesn't give full torque until 2000-2100 rpm, when it doesn't vibrate anymore.

it is posible that new cluch disc has to soft vibration absorber (coils). I found a lot of FPT cluch or Mecarp ones with this problem.

It's a luks clutch but I was thinking of this as well; that the pressure-bearing and the pressure-group might be a bit soft.

Another thing that I am thinking, when the old clutch came of, the clutchdisc wasn't nearly worn. The bearing seemed good as well, only the "fingers" (the diafragma-like thing, not sure what you call it in english) were really worn.

Could it be that my clutch system has air in the pressure-lines? Before the clutch (all three parts) was swapped with a new one it didn't disconnect too well either (e.g. I couldn't shift to 4th gear and pretty hard with grinding to reverse when standing still).

If it wouldn't have enough pressure against the flywheel I could understand it would start juddering at high enough torque (as the plates are "rough" enough)....

Just wondering!

wesselcolsen said:

So the torque limiter is not rev-dependant? If it is we could remap the car so it doesn't give full torque until 2000-2100 rpm, when it doesn't vibrate anymore.

Click to expand...

The torque limiter is an overriding map, which can be alterted during mapping.

You might need a corrected map that doesn't give you quite as much torque in favour of a stretched torque delivery.

wesselcolsen said:

So the torque limiter is not rev-dependant? If it is we could remap the car so it doesn't give full torque until 2000-2100 rpm, when it doesn't vibrate anymore.

Click to expand...

Anything is possible, I did this with my VRS. However you will need to find a tuner who can and it will cost a lot more as this will have to be a custom map.

If you look at the difference between these two;

This a AMD generic map



This is a custom map from the same tuner



The main difference is the custom map is a bit more gradual, feeds the power in better and gives you more power for further up the range, the second car is a lot quicker and better to drive as a result. You gets what you pays for.

At the end of the day the flywheel is operating outside of it's standard remit. it's going to moan.

My JTD vibrates in 3rd, 4th and 5th gear at low revs, it did it with the Angel Tuning map that I used to have and it also does it with the Red Dot map that I now have. I heard that it's either the gearbox vibrating because it's not designed for the massive torque increase or it's the dual mass flywheel struggling.

Just drop a gear and you'll be fine.

The juddering apears mainly when the torque is lower then needed. Vibration could be totaly another issue. Disconect MAF and fuel temperature sensor, it will pass on emergency map with more inj time and anticipated. If the juddering disapears is maping, if not then cluch disk.

yeah mine does this too.

MALIN POPESCU said:

The juddering apears mainly when the torque is lower then needed. Vibration could be totaly another issue. Disconect MAF and fuel temperature sensor, it will pass on emergency map with more inj time and anticipated. If the juddering disapears is maping, if not then cluch disk.

Click to expand...

I think you have the first sentance a bit backwards. I suspect the problem is that after remapping, the engine makes MORE torque at lower RPM than it did before. As a couple of others mentioned, use one gear lower to get the engine a bit away from its peak torque RPM and you should be fine.

No, I ment what I wrote. I've seen to many with this problem. most had soft springs on cluch disk or on flywheel. the others were not anticipated enough.

have anyone heard of replacing the jtd dualmass flywheel with a single mass to get over the issue of dualmass flywheel once and for all ?

erm, heard of a few french HDi cars or maybe it was fabia's again, they replaced the duallies with normal ones from teh sdi normal non turbo diesel (from 5yrs older model) and think it workd! but you'll need a new clutch to go with.

valeo appear to be th best with the luk ones reguarly slippng even when relatively new


yes non RR'd remap often = violent lumps of torque at bottom end getting thrown in, they started the clutch slipping and upset the DMF A LOT.
solution, get a better map, check EGR valve is working properly, AND BEST OF ALL, drop a gear, or don't boost it properly till its over 2,000rpm

mingsect said:

have anyone heard of replacing the jtd dualmass flywheel with a single mass to get over the issue of dualmass flywheel once and for all ?

Click to expand...

Yes, this is done with the Fabia in the more highly tuned examples however this will increase the general vibration at lower revs

any idea where to get the replacement done ?
or are your able to point me towards the direction ?

my ride is a doblo 1.9 jtd

thanks

probably do it yourself, or some performance garage.

a normal garage would not be interested in fitting parts from other vehicles to make your modified vehicle work, not unless you pay them a lot of money. or least thats been the experiance I had, so I just do stuff myself nowadays.