[gambit49]

hi again
I want to do remap my GD i30 but I am worry about clutch' s  torq limit what 's the torq limit ?

[AlanHo]

I very much doubt that anyone other than Hyundai will have a figure.

However - I think I can give you a clue.

My clutch slips like mad if I try to reverse up a steep slope that I am able to climb in first gear OK.

The clutch is quite clearly not capable of handling much more torque than the maximum the present engine tune puts out.

My clutch slips like mad if I try to reverse up a steep slope that I am able to climb in first gear OK.

The clutch is quite clearly not capable of handling much more torque than the maximum the present engine tune puts out.

I beg to differ... I'm not sure how often I've contradicted Alan... but here goes.

Alan, what you've said only suggests that the gear ratio for reverse is too high (low). The clutch is essentially a variable gear ratio, nothing more, between the two values of 1:0 (disengaged) and 1:1 (engaged). Between those two values it's anything, controlled by the left foot.

No amount of torque will alter that... this is simply how the clutch works. The question was:  Can the clutch handle the pressure from greater torque?

Yes of course.

Slip the clutch violently every time on take off and it will wear out, regardless of whether the the torque is OEM or purchased. Bought more torque? Use it wisely or you will burn the clutch... and here I suspect is where Alan and I agree.

[baroudeur]

Slip the clutch violently every time on take off and it will wear out, regardless of whether the the torque is OEM or purchased. Bought more torque? Use it wisely or you will burn the clutch... and here I suspect is where Alan and I agree.

Surely you mean "slip the clutch excessively"?  Slipping it violently may well do more than cause rapid wear of the  clutch lining.

[AlanHo]

Ignoring the semantics about the use of the words violently or excessively - what I do know is that if the clutch were capable of handling the full torque of the engine and the gear ratio was too high for motion on the incline - then the engine would stall.

That is not the case - the clutch slips and the car remains stationary. After a few seconds the smell of burning clutch is pervasive. Hence the clutch is unable to transmit the maximum power, torque or whatever you want to call it to produce rotation of the driving wheels when the car is on a steep enough incline for the gear ratio at the time.

Hence my statement that the clutch is not capable of transmitting more torque than the engine currently produces.

I accept that if the car's reverse gearing was a lower ratio - then the clutch would not slip - but that is not the point I was making.

[gambit49]

Ignoring the semantics about the use of the words violently or excessively - what I do know is that if the clutch were capable of handling the full torque of the engine and the gear ratio was too high for motion on the incline - then the engine would stall.

That is not the case - the clutch slips and the car remains stationary. After a few seconds the smell of burning clutch is pervasive. Hence the clutch is unable to transmit the maximum power, torque or whatever you want to call it to produce rotation of the driving wheels when the car is on a steep enough incline for the gear ratio at the time.

Hence my statement that the clutch is not capable of transmitting more torque than the engine currently produces.

I accept that if the car's reverse gearing was a lower ratio - then the clutch would not slip - but that is not the point I was making.

I think clutch's limit is higher than 260 nw becouse part's has some tolerance 
clutch's life depending on use I want to remap my car
after remap
128 to 170 hp
260 to 330 nw

[Asterix]

Hmm, maybe I'm not right, but anyway.

Maybe in theory the car can't deliver more than the 260 NM to the clutch, but when I set of from standstill with the car + caravan the weight is 3200 kg. That sure put more stress (torque..?) on the clutch than just the car alone.

I can of course get the clutch to smell if I've to do a lot reverse with the caravan, but my late Nissan did that too, and the clutch in that lasted more then 330.000 km.

[Phil №❶]

I think clutch's limit is higher than 260 nw becouse part's has some tolerance 
clutch's life depending on use I want to remap my car
after remap
128 to 170 hp
260 to 330 nw

I think you're going to have trouble if you use the original clutch. It doesn't make sense to up the engine power / torque and leave other components standard. The clutch is only as effective as the strength of the spring that maintains contact with the flywheel. Get a better clutch.

[gambit49]

I think clutch's limit is higher than 260 nw becouse part's has some tolerance 
clutch's life depending on use I want to remap my car
after remap
128 to 170 hp
260 to 330 nw

I think you're going to have trouble if you use the original clutch. It doesn't make sense to up the engine power / torque and leave other components standard. The clutch is only as effective as the strength of the spring that maintains contact with the flywheel. Get a better clutch.

I searched it but I do not find any upgrade clutch ban on asbestos since 2001 for that reason clutch's strength is not good enough I know clutch's load increase with high torq  I think If I use carefully It will be tolerated 

[rustynutz]

Tuning chips supposedly up the torque by a fair percentage and I've yet to hear of anyone suffering clutch issues.... 

[Phil №❶]

Some of the cars in our "Korean Pics" thread are highly modified, so it more than likely is possible to get stronger clutches, but they'd be in Korea and language would be a barrier to most. As you're having the engine remapped, what do the engine people say about this issue, can they advise a supplier for clutches 

[Lakes]

Just leave stock clutch, do your mod then find out. as a bit of clutch slip is better that a harsh hook up. as that can put a lot of stress on drive train.& diff.
But tyres would most probably break traction.

[freakzoide]

From personal exprience on a U1 CRDi, anything above 300Nm and the clutch will start to slip in higher gears (4th-5th) and on rainy/misty days.