[JS JTD]

why did you go with the 305mm brakes?

Because I want to keep my 16" selespeed alloys.
And I got this pair of calipers for a nice price, less than half that one would pay for 330 calipers.

 

[sarkan]

Adapters drawn succesfully. I am awaiting them to test.
Yan ko - 166 has 150mm, original brakes 100mm.
Btw. Joel - we have both the same reason for unusing 330mm brakes

 

[yan.ko]

Btw. Joel - we have both the same reason for unusing 330mm brakes

The same here ;-) at least on 156. GTV calipers has already been upgraded to 330 brembos.

 

[JS JTD]

Just made an appointment for replacement of the clutch wednesday the 13th. I'll keep you posted.

 

[TribesMan]

SMF or DMF?

 

[JS JTD]

SMF or DMF?

DMF.

Reason to have a SMF in the first place was more possible torque in the 1500-2500 rpm area.
But, in combination with a SMF this will probably give quite some vibrations to the driveline.
Then I prefer to have the current reduced torque without vibrations, and with the new clutch torque past 2500 rpm can be increased.

 

[JS JTD]

Just got my clutch, is the diameter too small...
Hopefully I can change it before the 13th.

 

[Allerd]

not to lucky with this upgrade.. I know how it feels..
Do you use it with the original pressure plate?
I may have to upgrade mine soon..

 

[JS JTD]

not to lucky with this upgrade.. I know how it feels..
Do you use it with the original pressure plate?
I may have to upgrade mine soon..

Original pressure plate with increased load.

Here's the issue:
The one with springs (SMF type):

And the one without (DMF type):

 

[JS JTD]

Hmm, today the decomposition of my current clutch went into a new stage.
When doing a 120-180 acceleration in 5th gear (with a little bit of slippage), after lifting the throttle a strange resonating sound comes from underneath the car. Multiple times when doing that.
Can this also be a DMF issue? I've never heard this before.

We'll see next wednesday at the the garage. For now it looks I don't have the DMF clutch back in time, so the SMF kit is going in.

Also I started work on the intake manifold, the one that came out of the car when it was replaced under warranty.
What a mess inside! I removed the swirl flaps and cut the entrance where the bottleneck is located. To be continued...

 

[JS JTD]

Had the SMF + dual friction fitted yesterday.

My first impression:
- Idling, same as original
- Bitey when accelerating from standstill, especially in reverse.
- Gear shifts in higher gears no problem
- Faster rpm buildup due to less inertia of the SMF
- Slightly changed mechanical sound during acceleration
- Great with fast accelerating through the gears

This set requires a different driving style, the clutch needs to be released quicker. Keep it half way (what you would normally do with a standard clutch to have some dosed slippage) and the car will shudder.
I had to drive the car in heavy traffic yesterday (stop & go) and that is definetely less smooth than with an organic clutch.

Now I know some of these aspects are caused by the SMF, and some by the clutch. I don't think this should be a reference for the dual friction combined with a DMF, could be totally different.

Also, I got some feedback from customers that report it will get smoother after several hundred miles. So I will post my experience also later on.

 

[sussexa]

did they give you a figure of miles to keep off boost to bed the plates in ? I was advised 500 miles to bed in then let rip.

 

[JS JTD]

did they give you a figure of miles to keep off boost to bed the plates in ? I was advised 500 miles to bed in then let rip.

Nope... But 500 miles off boost seems nonsense if you ask me.

 

[sussexa]

This was garage rec, let the plate bed to disc and flywheel much like pads bedding on new discs.
High torque on a minimal contact patch could make slip and cause damage maybe?
I was happy to as it feels all the better when you get full beans again.

 

[dusanGT]

Had the SMF + dual friction fitted yesterday.
My first impression:
- Idling, same as original
- Bitey when accelerating from standstill, especially in reverse.
- Gear shifts in higher gears no problem
- Faster rpm buildup due to less inertia of the SMF
- Slightly changed mechanical sound during acceleration
- Great with fast accelerating through the gears

What is the situation of the engine braking when the accelerator pedal is released? And what is difference in mass between SMF and DMF?

 

[JS JTD]

What is the situation of the engine braking when the accelerator pedal is released? And what is difference in mass between SMF and DMF?

If I want to engine brake in 2nd/3th gear I have to apply the throttle to have a smooth transition. Yesterday I found out the throttle is key in all low speed clutch operation.
From standstill, I have to drive it as a gasser with the throttle during clutch engagement, then the clutch will slip and all is fine. If I brake the engine without throttle it will shudder, especially in 2nd gear.

Mass difference is +/- 5 kg, quite a bit. Some more weight would be better I think, both for clutch engagement and pickup between gear shifts.

 

[JS JTD]

Some pictures of the install:

 

[dusanGT]

... the throttle is key in all low speed clutch operation...

It is logical consequence of lowering of rotational inertia of flywheel...

 

[Mordi]

So, your Flywheel weigt about 8kg?
ive got mine back with 10 kg´s mass.
pretty heavy, but oe is 12,2 you know. hope i will feel it too!
so your accelation is become much better?
if you look at your flywheel now. is it still to heavy or to light?
greets

 

[JS JTD]

So, your Flywheel weigt about 8kg?
ive got mine back with 10 kg´s mass.
pretty heavy, but oe is 12,2 you know. hope i will feel it too!
so your accelation is become much better?
if you look at your flywheel now. is it still to heavy or to light?
greets

Mine is a little under 8 kg. Original Alfa DMF is 12.8 kg.

It revs a bit faster ofcourse, but I will check the acceleration. Because of the low rpm range of Diesels the advantage of a lighter flywheel is lower than on a gasser.
I think your 10 kg is a good choice, with more inertia you need less engine rpm when releasing the clutch. Did you have your flywheel balanced again after the modification and did my drawing help you out?