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Mjk Fly Truck Chassis


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#21 xr8

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Posted 30 August 2014 - 12:38 PM

Put the chassis under a Sisu as buggyras are quick out of the box. After a bit of fiddling it gained a half second a lap, bit fiddly to put together but a good kit just the same.Dale
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#22 FLY in the wall

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Posted 24 July 2016 - 07:12 PM

Sorry to bump an old thread.

For a laugh i just bought two Scalextric trucks.

Does anyone think there is enough adjustment possible as the scaley trucks have a slightly longer wheelbase? i don't have them yet so cannot measure.

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Who has them?

Edited by FLY in the wall, 24 July 2016 - 07:14 PM.

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#23 Lloyd Lucas

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Posted 25 May 2017 - 08:48 PM

sorry to bump an old thread

but

looking at getting a buggyra, the chassis kit, super single rims and tyres. what axle would i need and is there anything else i'd need?

#24 gazza

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Posted 26 May 2017 - 10:45 AM

With the super singles i think the slot-it axle is the best to use, you might as well use a slot-it crown as well
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#25 kalbfellp

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Posted 26 May 2017 - 01:15 PM

I would be carefull with tyre selection, these Elephants need to slide a bit.
You will also need rear bearings,to suit the Slot it rear end.

#26 shadow_rusty

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Posted 26 May 2017 - 04:42 PM

I tend to run the stock rubber singles on the outside of the rim, and MJK's on the inside.
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#27 Lloyd Lucas

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Posted 08 June 2017 - 10:20 PM

So got the truck and chassis, need pinion and crown. Not sure on which to get.(first slot car modification)
Have found slot it inline 9t pinion and 27t crown. is this the best option? would like it a little bit faster outta the corners.
Smaller pinion or smaller crown?

#28 slo1quick

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Posted 09 June 2017 - 05:41 AM

Not familiar with these beasts so not sure on optimum gear ratio.
But, smaller pinion (less teeth), technically, will give it more punch and more brakes, alternatively, so would a larger crown (more teeth).
Best to grab a few crowns and pinions and play around with different ratios.
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#29 difinity

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Posted 09 June 2017 - 06:48 AM

I find what makes 'faster out of the corners' for any chassis, is smoother acceleration rather than 'more punch'.
For faster motors (say 22k +) I gear for brakes - 2.7-3:1 for slower motors with good torque, I gear 2.4-2.8:1 (say Jack Rabbit). It does depend on the track too.

In 1:1 scale racing, a lot of drivers have said that if you are unsure what gear to use in a corner, change up and push harder...smooths the car out

#30 kalbfellp

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Posted 09 June 2017 - 07:05 AM

I run my trucks around 170 to 180 grams with either the standard motor or NC5, geared 9/28 or 9/29.
I also reduce the tyre diameter down to around 26mm. These things are so top heavy they needs lots of weight to handle.

#31 shadow_rusty

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Posted 09 June 2017 - 11:38 AM

As pointed out by Phil, tyre diameter plays a major part in the gearing of these behemoths...

A 28mm tyre has a circumference of 80mm, and a more 'normal' 20mm tyre is only a 60mm circumference.
To put that in perspective, if both cars are running the 'standard' 3:1 gearing, the truck will move 30mm per motor revolution, whilst the standard car will only move 20mm.
That's a whopping 30% difference...

Now, as the trucks do run long can motors, they can pull quite 'high' gearing.
On the more open tracks, and the ovals that we have tended to run the trucks on here, I generally run the 'old' 15k trucks at 9/27, and the 'newer' 18k trucks, run much better at 9/30, or 8/27, all of which are quite tall gearing, but that assists in reducing the torquey tail slide that occurs at shorter more 'correct' gearing.

Edited by shadow_rusty, 10 June 2017 - 11:13 PM.

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#32 Lloyd Lucas

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Posted 10 June 2017 - 09:17 PM

Cool, thanks guys. Will get 8 and 9t pinion and 25, 27 and 30 crown.

#33 Sports Racer

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Posted 24 September 2017 - 10:03 AM

I've bought a 2nd hand Mercedes off eBay and it has 11/27 gearing. Even with these tall gears it seems to have enough punch out of corners with it's standard Fly longcan. Has anyone else tried gearing like this?
May the downforce be with you.

#34 kalbfellp

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Posted 24 September 2017 - 12:16 PM

IMO the gearing needs to be changed unless it has very small tyres and no weight.
The Merc is the hardest of the trucks to get to handle, we run them with a big slab under the chassis.
Check out the Fly Truck Proxy pics over in SCI for all the info.

#35 Sports Racer

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Posted 21 December 2017 - 11:27 AM

I finally got round to running the truck on the local commercial 8 laner and it goes well, even with it's crazy gearing and no weight added. Very easy to drive and quick through the sweeping corners with it's quad MJK's on the back. I'm surprised how deep it goes into corners before you have to brake.

Laps bout 4/10 ths slower than a good Scaley GT, wouldn't win a GT race but it wouldn't come last.

It loses about a truck length per lap against Shadow Rusty but I'm happy with that considering how much work he's put into his trucks.

.

Edited by Sports Racer, 21 December 2017 - 11:47 AM.

May the downforce be with you.





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