Clutch tech

[Shag55]

Yea, Roger Crawford is right ther knocking with his 9.06!

[Shag55]

Hey Mexx, why no slots, grooves or vent holes on the floaters to help with heat?

[MeXX]

Hey Mexx, why no slots, grooves or vent holes on the floaters to help with heat?

Dear shag

As you know space is limited inside the clutch we had to decide very carefully how thick or better how thin every layer has to be.

So we ended up with:

            the flywheel side:      Stainless steel carrier plate (2mm) sintered friction layer (1.5mm)
                    Black Magic:      5135 friction layer (2mm) steel carrier (2.4mm) 5135 friction layer (2mm)
    the pressure plate side:      Stainless steel carrier plate (2mm) sintered friction layer (1.5mm)

The aim is to get a clutch that is able to be abused for at least 15 to 20 full power starts with only minor adjustments and without pullin' the mill.

MeXX

[MeXX]

Hi to everyone

Some further info of my clutch testing:

T&T Bechyne

New clutch engaging smooth but hooks up quickly;
as of the reduced disk weight it is easier and smoother to shift and less stress on the syncro hubs (to be hoped)

First run the track was dry but not Pop corn dry (like big daddy Jerry Lackey called it).

Second run traction was OK but only 1/8th mile.

<a href="http://www.youtube.com/v/eKzVAVo_ZBs" target="_blank">http://www.youtube.com/v/eKzVAVo_ZBs</a>

Third run same as 2nd run

<a href="http://www.youtube.com/v/VPjBMeWncwU" target="_blank">http://www.youtube.com/v/VPjBMeWncwU</a>


Now I will pull the mill check out the clutch and next tests are on 15th 16th June on Meidl Airport(HU)

Soon more

 MeXX

[Shag55]

It seems like you are not leaving hard on the 2step. What rpm are you launching at?

[Old Guy]

It seems like you are not leaving hard on the 2step. What rpm are you launching at?

I was wondering the same thing.  Also looks like an abreviated burn out with not much heat in the tires.  With all your horsepower I would think you would be looking for 60' in the 1.20's.  I know you are sorting things out but what is your best 60' thus far?  Thanks for all your sharing of information.  You've got a great car turning impressive times so far.  Good luck!

[Basti]

I read that Mexx did a 9,3 this weekend!

Congratulations!!

Basti

[Typ3racing]

Hi,

after talking a lot with mexx last Weekend i just had to sign up here and take a look at this thread.

My clutch setup, what i thought would be be great, is not that good said Mexx.

At first, i am talking about my EJ25 powered notchbak with G64 Trans.

To get rid of slipping clutches i chose a 2-Disc Sinter Clutch from AP

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I made a flywheel of solid C45 heat treatened "german tank" (no joke) steel.

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But i just couldnt handle the beast, so i added some hydraulics and electronics.

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Now, these gizmos do what my left foot (and my brain) can not, and 60ft are dropping.

Looking forward to the next races, maybe i will improve my 60ft to <1,6s  and the ET to sub 11sec.

[MeXX]

Hi to everyone

After the last 3 races(Bechyne CZ, Trencine SK, and Alkersleben D)  were rained out, I was only able to make 4 runs.
I took the time to pull my engine look at the clutch and make some further runs at Meidl Airport (HU).

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The clutch surface was very smooth and shiny and there was really no measurable wear either on the clutch disc nor on the wear plates.

BTW It takes about 3 hours to pull the engine look at the clutch and assemble everything again.

MeXX

[MeXX]

I read that Mexx did a 9,3 this weekend!

Congratulations!!

Basti

THX Basti

I found a video from an unknown guy.

<a href="http://www.youtube.com/v/Lp5nfUsS-bY" target="_blank">http://www.youtube.com/v/Lp5nfUsS-bY</a>

MeXX

[Andy Sykes]

Hi,

after talking a lot with mexx last Weekend i just had to sign up here and take a look at this thread.

My clutch setup, what i thought would be be great, is not that good said Mexx.

At first, i am talking about my EJ25 powered notchbak with G64 Trans.

To get rid of slipping clutches i chose a 2-Disc Sinter Clutch from AP

[ Attachment: You are not allowed to view attachments ]

I made a flywheel of solid C45 heat treatened "german tank" (no joke) steel.

[ Attachment: You are not allowed to view attachments ]

But i just couldnt handle the beast, so i added some hydraulics and electronics.

[ Attachment: You are not allowed to view attachments ]

Now, these gizmos do what my left foot (and my brain) can not, and 60ft are dropping.

Looking forward to the next races, maybe i will improve my 60ft to <1,6s  and the ET to sub 11sec.


Cool I like gizmos how does it work

Cheers andy

[MeXX]

As promised we were racing at Meidl Airport (HU)

As it is an unprepped airport we had to make some setup changes to launch a little bit softer.
The plan was to run less nitrous launch softer but still try to cut down 60 ft times.

First run was 9.105  (sorry got no time slip).

Second run with less nitrous better 60 ft less top speed and same ET

[ Attachment: You are not allowed to view attachments ]


Soon more...


MeXX

[richie]

Nice ET   and to do 2 passes the same ET is amazing, getting close to the magic 8s    when will you get a chance to run on a prepped track? The clutch wear looks really nice and even as well, it looks to be working better

cheers Richie

[MeXX]

Nice ET   and to do 2 passes the same ET is amazing, getting close to the magic 8s    when will you get a chance to run on a prepped track? The clutch wear looks really nice and even as well, it looks to be working better

cheers Richie

THX dear Richie

U R right, I'm really happy with the clutch, how smooth it launches but hooks up soon and is really easy on the tranny parts.
This weekend I'm on a car show
but next weekend I'm on a well prepped track at Kunmadaras

So let's see

MeXX

[Typ3racing]

Cool I like gizmos how does it work

Cheers andy

The clutchsystem is a copy of what Magnus is selling:

http://magnusmotorsports.com/products/transmissions/launch-control-device/#.UcLQdPn0GfU

But with a second solenoid, that keeps the fluid from returning.

So staged i step on clutch and break, push the button on the steering wheel, full throttle for launch software,
and when the time has come (after poor RTs, most of the time) finger off the button to launch.
After a tenth of a second (when the clutch begins to bite) the gizmos release the linelock for the front brakes.
I think its fine to get the whole drivetrain pre-tensioned.

So i managed the last 2 races to keep the 60fts in between 4/100 of a second. (4 runs each)

This is more consistent than i ever could do with my left foot.

At better tracks (BIT) i am sure the 60ft will be less than 1.6 so the 10s ETs will be there.

Maybe.

[MeXX]

Hi

Just got a nice video from my 9.105 run

<a href="http://www.youtube.com/v/G4YeL8Fal0E" target="_blank">http://www.youtube.com/v/G4YeL8Fal0E</a>

MeXX

[MeXX]

2 nd run same time

<a href="http://www.youtube.com/v/F73BZWwu3MM" target="_blank">http://www.youtube.com/v/F73BZWwu3MM</a>

MeXX

[dangerous]

Car is running very sweet Mexx! 151mph is pretty cool.
Bit of clutch slip on the 2nd run, off the line?

[Shag55]

Very nice runs!

[Typ3racing]

No Updates here??

Hockenheim this Weekend?

[Typ3racing]

Now i am satisfied with my clutch setup.

Last Weekend at Hockenheim i managed to do a 1,51s 60ft with my heavy car.

Almost 1200kg at the starting line and only 400hp. 

After a few changes at tyre pressure, launch rpm (and a stiffer rear suspension of course)
the 60ft dropped from 1,64  to 1,51s.

But it was too hot, so the ecu retarded spark advance too much,

again no 10 
<a href="http://www.youtube.com/v/PPz4beveEKg" target="_blank">http://www.youtube.com/v/PPz4beveEKg</a>

[Shag55]

Not bad! How heavy is it? My street car is 2150# and best so far of 1.55 60'
I'm building a notch as well and it will be all steel and complete. So heavy as well.
Also what clutch?

[Speed-demon]

Mexx are you coming to SCC?? We look forward to seeing your car at a decent track!!

[MeXX]

No Updates here??

Hi Uwe

Sorry, but because of a broken crank I was forced to stop testing a wait for a new one.
As I got the crank in the very last minute it was only possible with big help of my crew and one night of engine building and the following day and night of driving to participate the SCC at Gardermoen.

Now here is the last evolution of my clutch:



[ Attachment: You are not allowed to view attachments ]
To prevent wrapping of the wear plates they were bolted with 24 small screws



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Used clutch disc vs new one



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new clutch disc



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used clutch disc with about 40 launches but only few on nitrous.
Notice how smooth and shiny and flat the surface of the disc is.

The only thing I had to realise is that twelve small counterweights is still a little to much weight,
as on perfect prepped tracks like Kunmadaras where there is really no wheel spin at the launch, the RPM drops from
7000 to 4600-4800. So for next time I will try a little less counterweights to allow more clutch slip and therefor a higher launch RPM.

MeXX
 

[Frallan]

Love this thread!
The key to Drag Racing that so many loses focus on (plus making HP and minimizing weight) is undesrtanding and developing your clutch and driving technique.
Thanks Mexx and all contributions.

[Shag55]

That's a bit of a drop. Why leave so low in RPM. I've seem most guys seem to leave around 8500 in there pro stockers and SS. Ever Roger with the nitrous leaves high.

[Typ3racing]

I think Mexx is trying not to break his drivetrain 

This stupid 911 tranny is the only thing thats keeping him away from the 8s.

Launching harder he could gain the missing  /10s on the 60ft

But this gearbox wont survive it.

Next try on DDD Bitburg??

[MeXX]

I think Mexx is trying not to break his drivetrain  

This stupid 911 tranny is the only thing thats keeping him away from the 8s.

Launching harder he could gain the missing  /10s on the 60ft

But this gearbox wont survive it.

Next try on DDD Bitburg??

Sevas Uwe

I'm trying hard but did break one till now. It's the fourth season and the first gearbox the only parts I broken were syncro hubs and dogtooth due clutch problems (development). As if the clutch discs and or wear plates are wrapped the clutch doesn't open completely the syncro hubs and togtooth have to take an enormous amount of energy and a very hard impact they often can't handle and finally break and saving the rest of the gearbox.

So let's see.
I'm really happy with my clutch now just checkin out how many launches it will handle without maintenance.
But still trying to win races  
and tryin hard to set records  

next race is Kiskunlachaza (HU)(pretty well prepped track)
and then Meidl Airport (HU) (just an ordinary Airport, but was already able to run 9.105 twice there)
and then maybe DDD

So Long

MeXX

[Typ3racing]

But why are the 60ft times so high?

As your car is sooo lightweight, even on a superb track you should get around 1.3..............

Even my really heavy notch achieved 1.5

What about DDD???

[Shag55]

The 60s will come down to 1.3 I'm sure once you get a handle on the launch with the 2step and right RPM as well as pre loading with the stage brake. Practice!
Good luck on the future 8s!