Technical 1.9jTD -MODS???

[Stilo Multijet 140bhp]

They change a bunch of stuff during the remap, so i think they can adjust it according to rpm as well.

When the clutch slips, it just takes more revs (around 300 rpm for now) but no more speed. After a few seconds the speed catches up with the revs, but this wears out the clutch, so the safe thing to do is lift you foot of the speeder a bit.

And it always happens in the high gears first, so when your clutch starts to get worn out, you'll notice it in the high geras first. Most likely on the motorway whenyou need to overtake a car and you put youur foot down, but nothing happens (ecxept more revs).

The less torque will be around 2500 rpm, so the max. bhp should not be affected. I will of course have less bhp at 2500 rpm, but i can live with that.

I will report back, when i get it tweak down i bit (hopefully next week).

So does that mean the car won't be as fast or does it just mean it'll have it in another place in the rev range????

I'm sorry for all the questions it's just that a remap is something i really want to get done but if i have to spend 500 euros to only gain 10 or 15bhp i'm not sure if it's worth the cash...

Thanks again

 

[Argonought]

I'm not as happy as i could be.

I agree - a slipping clutch is about as useful as a hole in the head if you're in a hurry - and likely to get a lot worse!

I'm rather surprised about the (tight) tolerance on the clutch. Are you sure it wasn't just an issue waiting to happen anyway?

 

[santa]

I'm rather surprised about the (tight) tolerance on the clutch. Are you sure it wasn't just an issue waiting to happen anyway?

I don't think the tolerance on the clutch is to blame, you have to remember that it has 305 nm as standard (mine had 334 nm standard so that's well above what it's supposed to have) and after the remap it has 415 nm. That's an increase of over 33% and i don't think they build in that nig a tolerance. The tolerance is more likely around 20% (which is around 370 nm).

 

[Stilo Multijet 140bhp]

But when you go up a steep hill the clutch must have to work much harder and i've never felt my clutch slip even under max acceleration on a very steep hill. To be able to cope with this kind of strain wouldn't they make the clutches with a quite high tolerance (i'm just guessing here so anybody feel free to rectify me if i'm wrong)

Also does anybody know if the clutch on the Abarth is diffrent to the multijet or any of the other stilo's by thet matter??? If so would it be possible to fit an Abarth clutch to a multijet??? If not the clutch must deffinatelly be able to tale 170, 180 or even 190 bhp.....

 

[santa]

It's not the bhp that's the problem, it's the torque.
When a car has 305 nm as standard, the clutch is perhaps designed to handle +20% torque (in this case ca. 360 nm), above that and it can't handle the torque and it starts to slip.

When you reach 170 bhp in the multijet,it's around 3500 rpm but the torque at 3500 rpm is close to 340 nm which is just 10% more than the highest standard torque. 155 bhp at 2600 rpm is on the other hand equal to 415 nm at 2600 rpm, and this is simply too much torque for the clutch (a plus of 33%).
So you can have lots of horsepower in the higher rev-range, but you need to be careful at the low and mid range.

So i don't think you can use the clutch from the Abarth, since it only has around 230 nm as standard.

I hope it makes sense.....
I will see if i can't get my graphs scanned, so you can see the bhp graph together with the troque graph, that way you can see the connection.

There's even a conversion you can make, that tells you how much torque you have at a given rpm if you know the bhp (and vice versa).

 

[Stilo Multijet 140bhp]

So what's the torque for and what's the bhp for????

If you want fast acceleration do you want high torque or do you want a lot of bhp??? If the Abarth has a lot of bhp but torque no where near the multijet and have good acceleration can you get this kind of setup with a remap???
Sorry once again for all the questions but i've never really understood the difference between torque and bhp...

Thanks

 

[santa]

The Stilo has has now been tweaked down to a more humane level for the clutch.

The figures are as follows:

169,8 bhp at 4178 rpm
370,6 nm at 2202 rpm

and i have to say, it actually feels better with this new remap than with the other one.

And my clutch isn't slipping anymore

 

[santa]

The graphs as promised.

There is one showing the car as standard, one with the first remap (with too much torque) and one with the second remap (the one i'm driving with).