Upturning Mini's

[Duke Thrust]

Hi guys,

A mate of mine and have a couple of Mini's (one M03 and one M03-L), both have uprated motors (21x3) ball raced, ESC's, decent shocks/dampers HPI X pattern tyres, (one has a ball diff) universals, turnbuckles.

The problem we have is their annoying habit of flipping onto their lids as often as possible when any kind of high speed cornering is attempted. Any suggestions on how to eliminate this would be gratefully received.

Are the stabiliser sets any good?

Cheers

Duke

[mud4fun]

LOL, I'm so glad to hear that somebody else has this problem and not just me!! I have an FF01 chassis that I put a New shape mini on, fitted larger and wider buggy tyres. Love the result because it means it can go over rough ground with ease but it too suffers from a tendancy to flip when cornering if it touches even the smallest stone etc. I thought the rolling was down to my much larger tyres but maybe not. One of my favourite cars nevertheless! [8D]

[Duke Thrust]

Yeah, it'd be less annoying if they simply lost control and skidded, it's just heartbreaking when they flip a foot into the air and then crash along the ground on their roofs until they (literally) grind to a halt.

[minijosh]

SLOW DOWN for the turns.

[Duke Thrust]

Sadly slowing down isn't enough, if you hit a small stone then over it goes.

[fury_dice(2)]

quote:

Originally posted by Duke Thrust

Sadly slowing down isn't enough, if you hit a small stone then over it goes.

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Which dampers/springs/oil are you running? Might have a bearing on the problem...

I got the same problem since I put x-patterns on the Mini - almost too much grip and flips before sliding. I partially got round it by reducing the steering rate on the tx (Futaba 2pk steerwheel jobby) so that the turn-in isn't quite so severe. Stones will still flip it though...[]

[TamTamRacer]

I haven't flipped my mini yet...but then again I've got the silver can in mine. Are you still using the friction shocks? If so try using the oil-filled ones, and get the stabilizer sets to limit suspension rolling. And try relocating your electronics to lower the Center of Gravity

[sosidge]

Stiffer springs, heavier damping, lower ride height should all help stop the car flipping. Even a tyre with less grip.

But if it's flipping beacuse you hit stones, you can't do much about that, the stone will be like a boulder in scale. To get a better rough surface ride you need softer springs and lighter damping.

[The Slayer]

Just flipped mine as well [] not on cornering as such during an S manouvere, at speed, they dont like that..... clipped a kerb and dented a nice silver wheel as well [] I have the stabilisers and low ground clearance - still flipped it though [xx(] No damage too shell - phew!!!

[WillyChang]

Lower your ride height.

Ideal stance is when the mini wishbones are Horizontal.

You need to add spacers or washers inside your shocks to achieve that.

[mud4fun]

To be fair to the poor car, I jacked it up on huge buggy tires so that I could run it round the garden on the dirt track, too much grip is also true as it is running pin spikes which grip real good on the loose dirt and rubble littering the garden. Mind you I've run similarly equipped cars of all types with no such problem - seems the mini is just jinxed!!! The thundershots can power around the same corners at two or three times the speed without rolling but they have very wide track. Mini Shell is also quite tall (certainly the new shape mini) and seems heavier to me than the subaru shells which I use on the T'shots. The t'shots eventually lose traction and the back end slides out which is easy to pull back again - not much you can do when the mini rolls apart from wait until it slides to a halt.....[]

[jozza]

Is the Mini prone to this cos it's front wheel drive, so it would handle differently to rear/4wd? I haven't had the problem with mine, but I'm running the standard 540 can in it, so it's not that powerful.

[mud4fun]

Good point! My mini is my only FWD car so I can't compare to others but it is true that all my RWD cars slide the back end out before rolling unless I'm doing something really silly.....

[The Slayer]

Here is my theory - correct if i am wrong [:I] A 1:1 car generaly is FWD yeah? they oversteer yeah? so the mini being FWD will also oversteer.. hence the light back end flips out effectivley twisting the car, at that point the front wheels lose traction and go the same direction as the rear - hence fliping the ****** over... the answer - weigh the back down... lower the ride height... it aint a heavy car to start with.. [] Remember in a 1:1 oversteer is better - you dont see the tree that kills you, understeer you do [8)]

[WillyChang]

quote:

Originally posted by jozza

Is the Mini prone to this cos it's front wheel drive, so it would handle differently to rear/4wd?

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No, all Tamiyas at standard kit-specified ride height are prone to

traction-rolling, be it TL01, FF02, TB01 (rally), M04 etc.

The only thing that saves them is the kit tyres are hard & gripless,

so it does a bit to reduce traction-rolling. []

[mud4fun]

Slayer, funny thing is that my FWD Tamiya chassis had a really bad understeer problem as standard, it was only when I stuffed on big grippy buggy tyres and softened the suspension a little that it actually oversteered - how bizarre!

[DJTheo]

Sorry Slayer, but I have to correct you [:I]:

Mud4fun that is not weird, FWDs are genereally understeerers and since understeering cars are more easy (but less fun [V]) to drive, most real cars nowadays are FWDs, while in the RC world, where safety and easiness isnt as important as fun, RWD dominate FWDs in units sold. Of course in the RC world, ore 4WDs are sold, just compared FWDs to RWDs.

As Willy sais traction rolling is not so dependant on drive layout but suspension setup and CoG, would think though at full throttle a FWD would roll a bit less as the lateral traction is reduced on the steering front, while at no acceleration in a curve it would roll a bit easier due to the more front usual weight distribution.

Cheers

[nickc]

traction roll is usually caused by too much grip on the rear, so try these :

1. lower the ride height - for stability

2. stiffen rear suspension - reduce grip

3. try a sway bar on the rear only - stability

4. maybe even try less grippier tyres than x-patterns, try tamiya reinforced type-A tyres all around the car.

[The Slayer]

OK - corrected [:I] but i aint Jeremy Clarkson.... Maybe Viki Butler Henderson []

[mud4fun]

you don't want to go there Slayer...... I always found VBH very attractive [][] A women that liked cars as much as the men....even got her head under the bonnet.....I like a girl who's prepared to get dirty... OUCH (wife clips me round the ear) [8D][][]

[The Slayer]

LOL.... I LOOK more like Clarkson [] worst luck!!

quote:

Originally posted by mud4fun

you don't want to go there Slayer...... I always found VBH very attractive [

][

] A women that liked cars as much as the men....even got her head under the bonnet.....I like a girl who's prepared to get dirty... OUCH (wife clips me round the ear) [8D][

][

]

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[Gates Mini Racing]

Had the same problem many a time in my mini, except now it goes head over heels (or should it be Bonnet over Boot?) [xx(]

I managed to stop the problem by fitting oil shocks with thick oil and stabalizer set. This seems to have stopped the problem a little.

Also if you mount the radio equipment and ESC, inside the frame, (allowing room for access) it deadens the problem a little more.

Mud 4 Fun - My FF01 seems quite stable really... Till I hit a curb []It had more rol(e) than sainsburys...