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Author Topic: New MeXXspeed mill V3  (Read 26842 times)
MeXX
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World record holder 8.733 @ 255.658


« Reply #180 on: July 26, 2021, 12:29:47 pm »

My only question might be what happens to the shift sequence if you get wheelspin? Wont that cause the revs to spike and also perhaps to lose 'loading' on the gears and upset the mechanism?

Cheers
Marc

check out the Data from a burn out....

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MeXX
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World record holder 8.733 @ 255.658


« Reply #181 on: July 26, 2021, 12:36:27 pm »

and a run... 8.90s

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MeXX
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Eddie DVK
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Posts: 831



« Reply #182 on: July 26, 2021, 12:47:17 pm »

Hi Volks...

yep the gearbox... is a topic at its own.... hope I'll find the time to start a new thread...
it is a Porsche G50 converted to Seamless... (Liberty style)
the shifter is a homemade vertical gate for going to the staring line and driving back after the run....
for the run it is air shifted... by compressed air from a carbon fiber tank 0.2 liter

so you put it into first gear...
will work with line lock in the future...
as long the line lock is aktivated plus a time of 0.4s the solenoid for the first gear stays engaged to keep the gear from popping out...
as soon as the car starts to gain speed, with the rear wheel RPM, the engine RPM ratio and the gear ration, the gear can be calculated...
1. gear detected and shift RPM reached (9200) solenoid for the equal gears is engaged moving the leveler backwards and engaging the 2nd gear in addition to the first...
no preload no ignition cut no retard.... just seamless....
as soon as the 2ng gear is engaged the 1st is disengaged...
2. gear detected and shift RPM reached (9200) solenoid for the unequal gears is engaged moving the leveler forwards and engaging the 3rd gear in addition to the 2nd...
as soon as the 3rd gear is engaged the 2nd is disengaged...


MeXX


Damn, and again very impressive..
I like all that technical stuff, so thank you for sharing...
Cool that this is in a vw car.
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Regards Edgar

" Type 4, it is a completely different engine. You have to drive one to understand! "
brewsy
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Posts: 348



« Reply #183 on: July 26, 2021, 17:15:12 pm »

and a run... 8.90s

MeXX

Hmm,
Blue is rear wheel speed. Faster for the burn out and slight difference between front until the run gets going.
Yellow is front wheel speed. Slight difference at the beging of the run and a nice jump as the front wheels land back on the ground after the initial wheelie.
I think you can also tell the difference in rolling diameter over the course of the run as the yellow overtakes the blue just before you shut the throttle

Im guessing that you average the wheel speed and the box shifts dependent on preset speed settings
Nice work
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hotstreetvw
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Posts: 290


« Reply #184 on: July 27, 2021, 15:30:54 pm »

Mexx, are you on the two step at 9k?
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MeXX
Hero Member
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Posts: 525


World record holder 8.733 @ 255.658


« Reply #185 on: July 27, 2021, 16:47:47 pm »

Mexx, are you on the two step at 9k?

burn out Rev limiter 8800
Rev limiter 9200

MeXX
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MeXX
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Posts: 525


World record holder 8.733 @ 255.658


« Reply #186 on: August 02, 2021, 13:35:25 pm »

Hi Volks....

As the high RPM is causing significantly more wear I have been tearing down my engine to have a look at the stressed parts....

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Looks like clutch disc is worn down....

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Only appr. 1mm friction material thickness left.... time to say good bye....
« Last Edit: August 02, 2021, 13:38:37 pm by MeXX » Logged

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MeXX
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Posts: 525


World record holder 8.733 @ 255.658


« Reply #187 on: August 02, 2021, 13:52:01 pm »

Disassembling of the engine...

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Everything looking fine so far...

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Some wear on the intake seat....

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« Last Edit: August 02, 2021, 13:57:38 pm by MeXX » Logged

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richie
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Posts: 5547



« Reply #188 on: August 02, 2021, 16:30:01 pm »

Hi Mexx

gearbox is very cool Cool

How many passes on that clutch? and the engine since last check/build?


cheers Richie
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Good parts might be expensive but good advice is priceless Wink
MeXX
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Posts: 525


World record holder 8.733 @ 255.658


« Reply #189 on: August 03, 2021, 08:03:28 am »

Hi Mexx

gearbox is very cool Cool

How many passes on that clutch? and the engine since last check/build?


cheers Richie

Hi Richie....

Yep I ♥️ my gearbox too.... but still some details to do....

The engine had appr. 30 runs on it all NA.... but because of the high RPM (red light 9300) I pay a lot attention to the engine internals.... to get more experience about the wear that will take place....

The clutch had about 50 runs on it.... but most with launch RPM 9000.... and no hard launches.... so most of the time the clutch is slipping 1.5s... and I tried burnout in third gear... which did not work.... and as it turned out only the clutch burnd out...🤔....

MeXX.
« Last Edit: August 03, 2021, 08:11:01 am by MeXX » Logged

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MeXX
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World record holder 8.733 @ 255.658


« Reply #190 on: August 03, 2021, 08:13:52 am »

Valve seats get fresh cut.....

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Cylinder surface
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No wear just minor glazing....

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Fresh hone....
« Last Edit: August 03, 2021, 08:19:59 am by MeXX » Logged

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MeXX
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Posts: 525


World record holder 8.733 @ 255.658


« Reply #191 on: August 07, 2021, 13:06:16 pm »

Main bearing look nice and there is no reason to change them....

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ibg
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Posts: 124


« Reply #192 on: August 08, 2021, 08:17:49 am »

that Autocraft case is a solid chunk of metal, do you have any additional thickness added or is this the 'normal' case?
nice to see the bare bones.
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MeXX
Hero Member
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Posts: 525


World record holder 8.733 @ 255.658


« Reply #193 on: August 17, 2021, 08:49:39 am »

that Autocraft case is a solid chunk of metal, do you have any additional thickness added or is this the 'normal' case?
nice to see the bare bones.

Dear Ian...

yep there were some modifications and reinforcements we did in a small production run... unfortunately it did not work in the first run and so they had to be melted down again....

here are some pix from the fresh molded and rough machined cases.....

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so long

MeXX

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ibg
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« Reply #194 on: August 18, 2021, 09:14:58 am »

MeXX, many thanks for those case photos.
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