80 MPH mobility scooter: Sold

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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby the german » Wed Apr 16, 2014 3:12 pm

dana wrote:you might be better off with less traction, with such a high center of gravity shifter cart tires might make it flip instead of drift. You probably just need several sets of tires depending on the track event you are running :rofl:

Oh, and very nice work BTW. I love seeing projects that are TERRIBLE ideas executed so well :beer: :beer: :beer:



Hey thanks! The project is really the fun part for me; I like making cool s**t :nuts: ;)

I'm thinking of the kart tires for a straight high-speed run rather than for drifting- I don't really want to blow up a tire designed for going 5 MPH when I'm doing 80. For drifting I found some at Harbor Freight for $5 each that I think will work.
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby the german » Wed Apr 16, 2014 3:17 pm

Quick cost update- scooter parts sold on eBay last night and shipped out today at lunch. Here are the new totals:

Scooter..........................................$100
Engine, bike parts.............................$100
4 new front wheel bearing.......................$8
keyed, weldable drive hub......................$12
expansion pipe, muffler, spark plug..........$90
Cutting & sanding disks........................$20
carburetor........................................$74
new ignition coil.................................$11
12T sprocket.....................................$13
22T sprocket.....................................$15
520 chain.........................................$17
pod air filter.......................................$5
top-end gasket kit...............................$15
Pier 1 wall basket................................$10 (you will see why later...)
ATV throttle........................................$8
SOLD Electric motor and controller..........-$112

Total.............................................$386
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby lorge1989 » Wed Apr 16, 2014 4:11 pm

So you have already made money on the scooter purchase, awesome.
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby UrSobsessed » Wed Apr 16, 2014 5:21 pm

So much awesomeness with this. Dress up like an old guy and go ripping the shit out of Walmart...
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby the german » Sat Apr 19, 2014 12:09 am

Friday update: Body work, brakes, controls

Started off the day by making the brake caliper carriers and welding them on. Started with this:

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And ended up with these:

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When I made the mounting hubs for the disks I was shooting for as short as possible without the calipers rubbing on the tires... nailed it!

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Bolted them up, did a quick alignment, and tested range of motion. Marked up the body work and trimmed it so the wheels now clear:

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With that done, I started in on cable routing and controls. Here is the basic concept I came up with:

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Then took apart the steering column and stripped out all the excess wiring and electronics. I trimmed the the console plastic to move the throttle inward on the handle bars and cut a hole behind the headlight to run the brake and clutch cables into, but given the angle it puts the cable at I'm going to end up doing something different.

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I measured out the throw of the ATV throttle vs. the carburetor, and it is only about 75% of what I need to get full juice.

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I used a die grinder to remove some internal stops to get more, but it's still going to need a secondary mechanism to achieve the correct motion ratio. Here is the max I get currently:

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Moving on to hooking up the brakes, I used some roll pins and #6 nuts to make cable stays:

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Welded them onto the frame, hooked it all up, and here it is:

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I tuned them in so they are balanced, then took it for a test ride down the hill I live on. They do the job, but the motion ratio on the lever is designed for one caliper not two so effort it high. Going to have to change that.

More bits showed up in the mail today, so more to come tomorrow :)
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby Midnight » Sun Apr 20, 2014 5:12 pm

This came across my news feed today, you may want to think about putting a wheelie bar on if your running kart tires. https://www.facebook.com/photo.php?v=671686129533304
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby the german » Sun Apr 20, 2014 10:04 pm

Hahahaha nice find! Don't worry, wheelie bars are already part of the plan :)

For those who can't see it-



And a few more:



Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby the german » Sun Apr 20, 2014 10:43 pm

Short update-

Here is a visual of how the motor fits in the scooter:

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With the motor now a confirmed runner, I went ahead and replaced the three top end gaskets yesterday, then took it outside for a bath. That's all for now!
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby chaloux » Sun Apr 20, 2014 10:58 pm

When do you hope to have it done by? Can't wait for vids
Matt

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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby the german » Sun Apr 20, 2014 11:35 pm

No real timeline per say, but I'd like to screw around with it this summer. I don't imagine it will take too much longer, but there are still a number of details to work out and parts to fabricate.
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby lorge1989 » Tue Apr 22, 2014 8:25 am

I cant get over the color of that thing. Its so terrible, but so perfect.
1988 Audi 90Q 1.8T 20v megasquirt'd and Holset'd
1994 Audi 90Q V6 oil burner, soon to be ABZ
1978 GMC High Sierra

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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby dana » Tue Apr 22, 2014 7:37 pm

how are you going to route the expansion chamber?
current:
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-the turbo tractor
past:
-11 second 90q junker
-20vt swapped 90q winter beater
-efi 10vt 4kq
-way too many other long gone urs's, 200's 4000's, b5's
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby the german » Tue Apr 22, 2014 10:36 pm

dana wrote:how are you going to route the expansion chamber?


It's going to get cut up and made to fit. The plan is to run it along the side of the cylinder, over the gear case, then a transverse muffler. As a friend of mine like to say, it will be "a bit of a science project" to make it all fit.
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby the german » Tue Apr 22, 2014 10:50 pm

lorge1989 wrote:I cant get over the color of that thing. Its so terrible, but so perfect.


I was going to sand it down and repaint it, but it does have a certain charm looking so incredibly crap...
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby lorge1989 » Wed Apr 23, 2014 7:14 am

the german wrote:
lorge1989 wrote:I cant get over the color of that thing. Its so terrible, but so perfect.


I was going to sand it down and repaint it, but it does have a certain charm looking so incredibly crap...


I would keep it as is for sure. OEM quality too. :D
1988 Audi 90Q 1.8T 20v megasquirt'd and Holset'd
1994 Audi 90Q V6 oil burner, soon to be ABZ
1978 GMC High Sierra

http://dubsinthebuff.com
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby the german » Wed Apr 23, 2014 11:22 pm

Got some more work done tonight. I started with sorting out the brakes, which were lacking when I did the last test. To fix this, a mechanism was needed to give the appropriate mechanical advantage for running two calipers on one lever (rather than just one caliper/lever like in a bike. I welded a tab on the frame for a pivot, and found some appropriate aluminum flat bar in the scrap bin for the lever arm, which I gave a 3:1 ratio. This system yielded much improved feel at the hand lever and easily locked up the front wheels in my driveway test.

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Next up, the rear sprocket. Machined a step in the keyed hub to the correct size for the sprocket, and welded it up:

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Here is the hub on the axle- it's going to be a VERY short chain.

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I'm now just waiting on some more scrap square tube so I can fabricate the motor mounts, then work on exhaust and cooling. More to come soon hopefully!
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter (ridiculous, but no Audi content

Postby the german » Sat Apr 26, 2014 11:08 pm

My plan was to fabricate motor mounts next, but in thinking about it and looking at layout, I realized I didn't know where it actually needed to be to fit the exhaust in there. To solve this, I ended up doing both at the same time. I started by setting the motor as far back as possible, then welding a cross-tube in front of it which the front mount will be welded to. With that in place, I started on fabricating the expansion pipe. Here is what I started with from the junk-yard; it's original application is a 250 KTM, but of course it was no-where near fitting in my application.

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Cut it up and make it fit the way I want it to! Doing this in my garage, so all the cutting, mitering, and grinding is being done with an electric angle grinder.

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With the pipe done I was able to determine where the motor needed to be laterally and weld in the front motor mount.

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Started on the lower mount next, more of that to come tomorrow hopefully :)
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter: Exhaust, motor mounts

Postby the german » Mon Apr 28, 2014 11:06 pm

Progress for the night: Engine is mounted, chain is on, floor pan has been roughly trimmed to fit the exhaust. It's starting to look like something!

Image

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Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
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Re: 80 MPH mobility scooter: Exhaust, motor mounts

Postby AngryTaco » Tue Apr 29, 2014 12:37 am

Great......now I'm hooked on building one of these. This is far by one of the coolest oddballs things someone has done
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Re: 80 MPH mobility scooter: Exhaust, motor mounts

Postby dana » Tue Apr 29, 2014 7:01 am

for some reason i feel the need to re-iterate how absolutely retarded this is going to be. This will defiantly be the scariest thing you have ever driven/ridden.
Great work, it looks so good. :beer: :beer: :beer:
current:
-mk4 tdi wagon with some mods
-TDI b3 90q, holset turbo, be strong little connecting rods!
-the turbo tractor
past:
-11 second 90q junker
-20vt swapped 90q winter beater
-efi 10vt 4kq
-way too many other long gone urs's, 200's 4000's, b5's
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Re: 80 MPH mobility scooter: Exhaust, motor mounts

Postby the german » Tue Apr 29, 2014 9:26 am

AngryTaco wrote:Great......now I'm hooked on building one of these. This is far by one of the coolest oddballs things someone has done


Hey thanks! You should do it- I'm having a blast building it so far
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
the german
 
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Re: 80 MPH mobility scooter: Exhaust, motor mounts

Postby the german » Tue Apr 29, 2014 9:29 am

dana wrote:for some reason i feel the need to re-iterate how absolutely retarded this is going to be. This will defiantly be the scariest thing you have ever driven/ridden.
Great work, it looks so good. :beer: :beer: :beer:


Hahaha you aren't the only one! There are quite a few people, many of whom are accustomed to very fast bikes, karts, and race cars, telling me that I will die on this thing. That said, they all want to drive it when it's done :rofl:
Kirk

1990 ABZ CQ
1990 lifted CQ
2005 S4 6MT
2011 A4 2.0T Avant (ok, it's my wife's car but it's sexy and I love it)
the german
 
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Re: 80 MPH mobility scooter: Exhaust, motor mounts

Postby AngryTaco » Tue Apr 29, 2014 1:39 pm

I seriously spent an hour on CL last night looking for a cheap scooter............

I'm thinking of using a 440cc snowmobile engine
1986 4000cs Turbo Quattro
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1995 urS6

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Re: 80 MPH mobility scooter: Exhaust, motor mounts

Postby 20VAvant » Tue Apr 29, 2014 1:46 pm

AngryTaco wrote:I seriously spent an hour on CL last night looking for a cheap scooter............

I'm thinking of using a 440cc snowmobile engine


We might as well stop being little girls and go ahead and pick up a 600cc motorcycle engine.
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Re: 80 MPH mobility scooter: Exhaust, motor mounts

Postby AngryTaco » Tue Apr 29, 2014 1:51 pm

and slap a k24 on there?
1986 4000cs Turbo Quattro
2001 Dodge Dakota R/T Standard Cab
1990 V8 quattro
1995 urS6

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Most orders are being refused until further notice. Please PM

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