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Post by dongtheng on Jan 14, 2007 22:52:57 GMT 7
Not sure if the subject title is appropriate but I just have this question on our car setup...
I run at TT01 (slightly hopped up but RWD - Front diff taken out) and realise that when making right turns, the car thens to understeer while left turns, serious oversteer. This occurs even after changing the steering setting (try out all options) on the controller.
My observation is that it could be due to the balance of the car where the right side is somewhat heavier than the left (due to the battery placement). I noticed that the FT103GT (RWD) have the battery placed across the chassis which might be designed to counter this inherent problem with RWD RC cars.
Not sure if it make sense. Anyone with ideas on how to remedy this problem?
PS: Not trying drifting yet...still trying to get use to the mechanics of the car...
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Post by iphong on Jan 14, 2007 23:54:03 GMT 7
TT-01 is not meant for RWD. The rear wheel is too narrow and not provide enough traction to hold the rear. You can try to put HPI 30mm wheel with high traction tires. One thing, most new cars with side battery design are not balanced. Even with highend cars like T2, TRF, Corally etc.... but it provide lower center of gravity for 4WD. Balance can be adjust by adding weight to the lighter side of the car. Take a look at all rear heel drive cars: 1/12th sacle, nitro 1/8th scale and 1/10th F1 cars. they all have really wide rar wheels. that makes rear wheel drive onroad cars possible to drive. And chassis balance is most important factor, that's why in the 8th scale nitro, engine and fuel tank is at center of the car. You should ask yourself why RWD trucks are so stable, engine and fuel tank is not always at the center. That's easy, all trucks has very wide tracks and chassis is very narrow.engine and fuel tank position on chassis doesn't make much different. That's why you only see nitro 2WD truck but not buggies. Also, you need extremely high traction tires for rwd cars. TT-01 stock tires have very low traction and very soft. Hope this helps you understand a bit. And one more thing, this is the drift forum. 12th scale:  1/8th scale:  |
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Post by NoSurprises™ on Jan 15, 2007 8:11:39 GMT 7
Hmm.. since this is a car balancing thread... How do we know tat the car is well balanced when we add in the weights in?? Or we just have to rough estimate on it??
I got thought of something... dunno whether workable.. by weighing the battery... then weighing the electronics.. from there...add in the estimate balance weight in it... is this idea workable???
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Post by qks57 on Jan 15, 2007 8:42:08 GMT 7
Not sure if the subject title is appropriate but I just have this question on our car setup... I run at TT01 (slightly hopped up but RWD - Front diff taken out) and realise that when making right turns, the car thens to understeer while left turns, serious oversteer. This occurs even after changing the steering setting (try out all options) on the controller. My observation is that it could be due to the balance of the car where the right side is somewhat heavier than the left (due to the battery placement). I noticed that the FT103GT (RWD) have the battery placed across the chassis which might be designed to counter this inherent problem with RWD RC cars. Not sure if it make sense. Anyone with ideas on how to remedy this problem? PS: Not trying drifting yet...still trying to get use to the mechanics of the car... making the car balanced is not we want to do in drifting.in drifting,shifting the weight to make the car drift is wat we do,so making it balanced doesn't seem much of a difference.for example,my own TT-01D 4WD drifts well even thou the right is indeed heavier than the left.1 thing i can say is tat,for TT-01,we can't really do right-handed doughnuts due to this weight thing thou.left-handed doughnuts are okay.but if u're skilled enough,right-handed doughnuts ain't really a problem.u're jus trying to know the car's mechanics,but different styles of driving require different settings for the car(e.g suspension,tyres,ride height etc) and this u ought to know.for our cars,RWD will most probably put u into a spin as ur front does not hav power to pull the car forward.and for ur question bout the understeer then oversteer problem,i once had tat too.but its all about the throttle control and steering.learn as u go along.its not the problem with the weight imbalance of the car.  |
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Post by sidewaysdriver6 on Jan 15, 2007 12:38:54 GMT 7
Not sure if the subject title is appropriate but I just have this question on our car setup... I run at TT01 (slightly hopped up but RWD - Front diff taken out) and realise that when making right turns, the car thens to understeer while left turns, serious oversteer. This occurs even after changing the steering setting (try out all options) on the controller. My observation is that it could be due to the balance of the car where the right side is somewhat heavier than the left (due to the battery placement). I noticed that the FT103GT (RWD) have the battery placed across the chassis which might be designed to counter this inherent problem with RWD RC cars. Not sure if it make sense. Anyone with ideas on how to remedy this problem? PS: Not trying drifting yet...still trying to get use to the mechanics of the car... i've seen this problem before. it's not due to the weight imbalance. if it was due to the weight imbalance you would actually oversteer to the right and understeer to the left, and not the other way around which is what you're experiencing. here's what to look for : assuming your servo has been properly centred prior to its placement in the chassis... 1) remove the bodyshell. 2) place car on mount/support so all wheels can spin freely but the chassis itself is stationary. 3) switch on your transmitter and then your car. 4) throttle, while throttling turn left all the way at a certain rotational speed. 5) throttle, while throttling turn right all the way at the same rotational speed. during steps 4 & 5, see if you notice a difference in response while turning left vs turning right. you may find when turning right the response is a bit retarded, and turning left the response is much faster. if so, this is where your oversteer/understeer problem lies - the solution would be to check your steering linkages, you may need to take them out and put them back together properly again. and iphong has a good point about not making the tt01 rwd . hth! |
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Post by sidewaysdriver6 on Jan 15, 2007 12:43:25 GMT 7
Hmm.. since this is a car balancing thread... How do we know tat the car is well balanced when we add in the weights in?? Or we just have to rough estimate on it?? I got thought of something... dunno whether workable.. by weighing the battery... then weighing the electronics.. from there...add in the estimate balance weight in it... is this idea workable??? for me i just look at the chassis from the front and see if the left side or the right side is lower ! but i don't add weights to balance it, for me i compensate with the tx settings (see my next post  . |
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Post by sidewaysdriver6 on Jan 15, 2007 12:52:50 GMT 7
Not sure if the subject title is appropriate but I just have this question on our car setup... I run at TT01 (slightly hopped up but RWD - Front diff taken out) and realise that when making right turns, the car thens to understeer while left turns, serious oversteer. This occurs even after changing the steering setting (try out all options) on the controller. My observation is that it could be due to the balance of the car where the right side is somewhat heavier than the left (due to the battery placement). I noticed that the FT103GT (RWD) have the battery placed across the chassis which might be designed to counter this inherent problem with RWD RC cars. Not sure if it make sense. Anyone with ideas on how to remedy this problem? PS: Not trying drifting yet...still trying to get use to the mechanics of the car... making the car balanced is not we want to do in drifting.in drifting,shifting the weight to make the car drift is wat we do,so making it balanced doesn't seem much of a difference.for example,my own TT-01D 4WD drifts well even thou the right is indeed heavier than the left.1 thing i can say is tat,for TT-01,we can't really do right-handed doughnuts due to this weight thing thou.left-handed doughnuts are okay.but if u're skilled enough,right-handed doughnuts ain't really a problem.u're jus trying to know the car's mechanics,but different styles of driving require different settings for the car(e.g suspension,tyres,ride height etc) and this u ought to know.for our cars,RWD will most probably put u into a spin as ur front does not hav power to pull the car forward.and for ur question bout the understeer then oversteer problem,i once had tat too.but its all about the throttle control and steering.learn as u go along.its not the problem with the weight imbalance of the car. regarding the difference in response drifting left and drifting right on the tt-01, this if you ask me is due to the weight imbalance issue (battery on the right side of the chassis makes the right side heavier, which makes the car steer to the right more easily). for me i compensate on the transmitter by reducing the right side steering end-point adjustment (epa) by 1% compared to the left side steering epa. it works really well on my car, recommend not more than a 2% drop but this depends on your car and drifting style. do a left-handed donut, remember how it feels, then do a right-handed donut and adjust (reduce) the right side steering epa until both left and right handed donuts feel the same. having a good digital tx will make this easier to tune . hth! |
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Post by iphong on Jan 15, 2007 15:01:02 GMT 7
chassis balance doesn't affect drifting. He's asking why his 2WD car acts unusual. Chassis balance is only important in racing. For drifting, 2WD is not in the list (or even waiting list)
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Post by sidewaysdriver6 on Jan 15, 2007 15:09:27 GMT 7
chassis balance doesn't affect drifting. He's asking why his 2WD car acts unusual. Chassis balance is only important in racing. For drifting, 2WD is not in the list (or even waiting list) uhm... which post are you responding to  chassis balance doesn't affect drifting cuz in my experience i find it otherwise... |
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Post by dongtheng on Jan 15, 2007 18:44:37 GMT 7
I thank you all for your valuable input... I will try out some of the recommendations above. My List: 1. Check Steering linkages 2. Experiment with the Transmitter Control 3. Compensate the weight on the left I am currently trying out 2WD at the so that I could compare it later on on 4WD mode. Still having fun crashing the car  |
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Post by qks57 on Jan 15, 2007 21:46:58 GMT 7
2wd is more difficult to control.for R/C most ppl use 4wds,but i've seen 2wds drifting.so i can't say its impossible.=)cheerios!and hav fun trying out rwd.=)
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