Oversteer and throttle control?  
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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC On Road Nitro Cars >> Oversteer and throttle control?
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Oversteer and throttle control? - 8/27/2008 1:27:34 PM   
Spetz


 

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Status: offline 		I'm just wondering, how come drift cars, when the rear steps out a bit, the front wheels keep the car going "straight" kinda
Where as in my car (not drift) if I give it too much gas through a corner it just spins out completely? it's also AWD
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RE: Oversteer and throttle control? - 8/27/2008 1:39:03 PM   
olkleaf


 

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Joined: 12/1/2007
From: h, VA, USA
Status: offline 		your tires aren't good or your set up isn't adjusted right (shocks, toe in and toe out, camber, ride height, caster). there are many things that can make your car over steer and spin out. tires are very important if you don't have the right tires for the front and back the car will be very unstable it will want to spin out on corners even just going in a straight line will be difficult.

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RE: Oversteer and throttle control? - 8/27/2008 1:41:08 PM   
PrjctStrtFrce



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Status: offline 		Main thing is suspension set-up and WEIGHT distribution

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RE: Oversteer and throttle control? - 8/27/2008 2:04:18 PM   
CBM Racing


 

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Status: online 		Yeah, plus with drifting the front tires are as slippery as the rear ones, so they all break traction at the same time. But with regular tires either the front or rear break loose on there own usually, causing either push or oversteer condition. The tires with the least resistance naturally try to lead the way, and the tires with more resistance(drag)naturally try to stay behind. Like when you hit the e-brake, the rear end looses traction, the front end has more resistance(drag) acting in effect like a parachute. The trick is to counteract these tendencies with set-up, tire selection, and most of all skill!

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RE: Oversteer and throttle control? - 8/27/2008 2:29:22 PM   
trini4life


 

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From: Queens, NY, USA
Status: offline 		exactly in drift cars they use lower grip tires and just like in the stage d the engine is moved foward so there is grip to the front wheels so the rear and front wheels keep on spinning..

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RE: Oversteer and throttle control? - 8/27/2008 2:58:29 PM   
Spetz


 

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Status: offline 		Well my car is a bit weird
Off throttle there is oversteer
On throttle (acceleration) it tends to get the rear twitchy and oversteer at times
And on neutral throttle (keeping speed through a corner) it understeers

This was ofcourse with no alignment (done just by eye), slick tyres, and pretty tight front and rear diffs

Since then I've done a proper alignment, put 50K front diff oil and 10K rear diff oil
I haven't driven it since though

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RE: Oversteer and throttle control? - 8/27/2008 3:14:16 PM   
Foxy



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From: Kingston UK, but living in Athens, GREECE
Status: offline 		Sounds like it's the overdrive ratio. A rear oriented overdrive will cause exactly what you describe, understeer in the mid corner, over steer on power. Apart from that, the usual things apply in order to increase rear grip... stiffer front sway bar, more rear camber, less rear toe, softer springs and damping, slightly higher ride height at the back (.5 to 1mm higher than the front).

What tires are you using? If foams, what shore, and what diameters?

PS. Off throttle oversteer is usually not enough (rear) droop.

< Message edited by Foxy -- 8/27/2008 3:16:53 PM >

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RE: Oversteer and throttle control? - 8/27/2008 3:42:40 PM   
Spetz


 

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Status: offline 		The car doesn't really have any droop. At most maybe .5mm or so

The tyres are Tamiya slicks, they're not very grippy but I ordered some HPI 23R slicks

What do you mean by overdrive ratio?
I had already put hard springs in the front, soft in the rear + front swaybar but somehow it wasn't really good handling

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RE: Oversteer and throttle control? - 8/27/2008 3:57:12 PM   
GYNAIKAS



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Status: offline 		What foxy said will help you stabilize the car more. But believe me, once the new slicks arrive there will be a huge difference...tamiya tires look soft but they're not.

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RE: Oversteer and throttle control? - 8/27/2008 4:18:50 PM   
Spetz


 

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Status: offline 		They don't even look that soft... and they last forever
They are so old that they are cracked everywhere

Of course I had to pay nearly $40USD for the HPI tyres compared to $24USD for the Tamiya ones

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RE: Oversteer and throttle control? - 8/27/2008 5:14:09 PM   
Foxy



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Status: offline 		Your lack of droop is definitely your problem. When you are cornering, the inside tire is lifting. remove the droop screws completely and fit good foam tires. Bet the difference is astonishing.

Search for overdrive ratio, I've explained it a number of times.

< Message edited by Foxy -- 8/27/2008 5:15:06 PM >

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RE: Oversteer and throttle control? - 8/27/2008 5:53:21 PM   
Spetz


 

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Status: offline 		The car has no droop screws
But basically the springs are stiff enough such that with the weight of the car, they don't really compress
Should I soften springs or take some preload out??

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RE: Oversteer and throttle control? - 8/27/2008 5:56:07 PM   
Spetz


 

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Status: offline 		I had a search for overdrive ratio but the only thing I found is for the gears
Nothing to do with handling

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RE: Oversteer and throttle control? - 8/27/2008 6:53:47 PM   
jayrguidaben


 

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Status: offline 		buy foam tires and you'll see the difference a lot more.

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RE: Oversteer and throttle control? - 8/27/2008 6:56:07 PM   
Spetz


 

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Status: offline 		The tyre size is an odd one and foams cost 60USD a set which isn't worthwhile for me considering I don't race, just bash around

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