XRAY - Model racing cars

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 Post subject: Changing te M18
PostPosted: Sat Oct 23, 2004 08:45:31 
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Joined: Sat Oct 23, 2004 08:22:54
Posts: 897
Location: Holland
Rebuilding micro's is becoming a hobby of me. I already made an EXO look-a-like chassis for the HPI Mirco and did set a speedrecord in Holland with it powered by a 480bb-race on 12 cels, the speed was 96 km/h

Now for the several upcoming wintercompetitions I did get myself a M18 and on some things I was not satisfied. By chaning the upper arms and an other mounting of the shocks by the idea if PenguinRC I have created a small racing monster:

New blocks for the upper arms:
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The rear suspension (not finished shocktower)
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The upper arms:
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Front suspension and new chassis (from plain circuit board)
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Motormount:
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Almost finished:
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My friend is also busy with the same kind of mods:
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I have now:
- better camber correction in the corners (shorter upper wishbone)
- full adjustable camber
- full adjustabel caster
- full adjustabel wheelbase +/- 2mm -> 148-152mm
- adjustable ride hight by spacing the shocktowers
- better weight balance in the car
- very stif chassis
- Active rear end steering (toe-in correction in the corners)


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 Post subject:
PostPosted: Sat Oct 23, 2004 09:54:51 
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Joined: Sun Oct 17, 2004 00:07:42
Posts: 71
Location: Poland
Well, congratulations :!: :!: :!:

A good piece of modelling job :!: Now if you equip your M18 with a brushless Mamba 8000 kV, 4 li-ion/li-poly cells (you will probably also have to switch to ball diffs), and set the biggest xray`s pinion (23 T) your "tool" will be able to reach unbelievable top speeds :!: :idea: ... you will need to think of a Lola-like body and you could try to beat at least your national speed record for electric-powered model :!: :idea:

P.S.
shaft driven cars will always have problems with either side-balance (when the motor is on the side of the shaft) or CG (when you put it above the shaft), perhaps somebody will sometime build a model with center-located motor laying on the "floor" and the shaft above it?, this should solve the problem of both side-balance and CG, but this would force the diffs to be moved up, but perhaps this problem will find its solution too? :wink:


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 Post subject:
PostPosted: Sat Oct 23, 2004 11:27:05 
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Joined: Sat Oct 23, 2004 10:29:03
Posts: 17
but this would force the diffs to be moved up, but perhaps this problem will find its solution too?


Universals on the ends of the center shaft... or cvd's

Not sure hot to make it work just yet but there is a start...


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 Post subject:
PostPosted: Sun Feb 01, 2009 21:22:06 
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Joined: Sat Oct 23, 2004 08:22:54
Posts: 897
Location: Holland
Updates...

After 4 years of racing my front upper arms did get some play and one did fell appart so it became time to replace them. When I did create this suspension I already noticed this could be a weak construction and already had thoughts of another construction.

Image

left: old arm
middle: electric part to connerct wires (do not know how to name that)
right: new upper arm

I did fit a brass tube into the part and fitted a M3 screw. Did solder it all together and made it to the right dimensions. I also made a few extra as spare if needed.

Image

Last race was very good but the car was a bit out of balance. I fitted some shimrings with the springs to take out the tweak:

Image

Zero tweak !
I also made some small changes to the toe-in, caster and camber because there were some differences between L and R and to create an even better steer response on our small track.

And mentioned in another topic a new servo which did make a huge difference in last race:
http://www.debaanbrekers.com/ftp/hs5084_servo.wmv
The Hitec HS5084-MG is at this moment the fastest digital servo to get.


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