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DT
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5,195 Posts
What is causing the rear of my car to slide out to the left (looking to the front from the top) when I give full throttle.

I have been playing around with motors and tyres. Is this a torque issue? Am I now over powered? Can it be fixed?

I'm trying to stike fear into the hearts of thos guys coming to Egg
 
G

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HI Nuro.

The answer to this is that your rear axle is not central and so it needs to be moved more central. The side that steps out is the side that you need to push in.

Baz
 

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Hello Nuro

I am most certain in over my head here,
but I still want too try too "help" you out here if possible. And if not…well then I will hopefully end up learning something. The problem you have cant that has too do with the motors mounting in the chassis? In the old scalextric cars the engine was placed "dead centre" in the chassis, and the rear axel crown gear was also "dead centre" and as a result it provided a smoother "power transfer". Today many of the new cars have a different setup for reasons I don't really get. Anyway…if possible I think you should try to get the "old" setup in place.

cheers
Eric

Edit...I´m way too slow in typing...again..sorry. as others.
 

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Scott Brownlee
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4,275 Posts
Torque of the motor turning is providing a "twist" to the car - think kids gyroscope tricks. If you are running brakes it will slide in the opposite direction when you let off on a straight. Don't think having the motor of centre makes a difference. Best way to feel this force is to hold the motor in your fingers and rev it. Better still, have just the motor and the guide. Hold the guide in the slot and rev - watch the motor dance around!

It happens to real cars too. The Peugeot 205 Turbo 16 Group B car had a mid-mounted transverse engine and in jumps would nose down if the drivers lifted off due to the torque reaction of the engine slowing. The evo 2 had big roof wing in part to negate this and drivers learned to have a bit of throttle on while in the air.
 

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Though not impossible, excess power would be unlikely to create this phenomenon alone.
I think we need to look at the more obvious possibilities first.

Just to check, Nuro, I assume this is in straight line acceleration?
By far the most obvious candidates are:
1. A slightly twisted chassis making the ground pressure/contact unequal on the rear tyres.
A secondary consequence could be of the twist creating uneven drag of guide in slot.
Uneven front tyre ground pressure/contact is another possible consequence.
2. Unmatched rear tyre diameter or width or profile. (Truing is a must).
3. Slightly differing rubber or pattern on rear tyres.
4. One rear tyre less round than the other creating uneven traction at one side.
5. Axle bushings at either end possibly not seated/aligned properly.
6. If independent front wheels, then look at the free running characteristics of both and make sure that the tyres are as evenly trued against each other as the rear pair should be.

I really do think its a chassis problem and/or tyre related.
 

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Hi Nuro.
You don't metion which car this is happening with.
Tropi's list is good.
Another obvious thing with Ninco, Fly and SCX cars, is to check that both rear wheels are firmly attached to the axle. If one is slipping it would give the result you describe.
Regards,
Lowrider.
 

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I think Lowriders suggestion is a good 1st check... had some fun with a 20yr old Scaley Porsche 911 last.... Turned lefthanders OK(ish) right handers were....
 

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Allan Wakefield
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5,857 Posts
Cars that kick to the left under hard acceleration are GOOD!

Don't try to fix it!!!

Of course this has nothing to do with the fact I am racing against you at the Party

 

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DT
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Discussion Starter · #11 ·
No chance!

I've abandoned that one, it was a supercharged Enzo. Looking at all the possibilities, I think the axle alignment must have been out slightly. A fault of the chassis. I've tried all the bits on another car with no problems.

I now have another that doesn't kick out.

Thanks for all the advice
 

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It was probably the motor kicking against its mounts under acceleration, Ive had a couple of cars do this if they wheel spin away, glued the motor in to stop it happening...........................

But now you have changed cars it doesnt really matter!!!
 
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