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2 TC's, same setup , different handling.

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2 TC's, same setup , different handling.

Old 10-14-2022, 11:03 PM
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Default 2 TC's, same setup , different handling.

I have 2 touring cars.

Same chassis and electronics.
Same setup, body shell and tyres.
1 was built by me, the other by a friend.
I did the final setup on them before they hit the track for the first time.

The 2 cars have a different feel about them when driving them on the track.
Laptimes are within 0.2s

1 chassis is smooth into through and out of the corner. Easy to hit lines consistently.

The other is very reactive to steering and throttle inputs. It pushes a little into and through the corner which makes it a lot harder to consistently hit the same lines.
It also overheats tyres making the car very difficult to drive after a couple of minutes into the run.

2 Questions;
1) What could be different between the 2 cars to cause the difference in handling?
2) What things would you recommend I try?
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Old 10-14-2022, 11:23 PM
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Originally Posted by dontfeelcold View Post
I have 2 touring cars.

Same chassis and electronics.
Same setup, body shell and tyres.
1 was built by me, the other by a friend.
I did the final setup on them before they hit the track for the first time.

The 2 cars have a different feel about them when driving them on the track.
Laptimes are within 0.2s

1 chassis is smooth into through and out of the corner. Easy to hit lines consistently.

The other is very reactive to steering and throttle inputs. It pushes a little into and through the corner which makes it a lot harder to consistently hit the same lines.
It also overheats tyres making the car very difficult to drive after a couple of minutes into the run.

2 Questions;
1) What could be different between the 2 cars to cause the difference in handling?
2) What things would you recommend I try?
I would figure out who built the one that drives the best and have that person rebuild the other.
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Old 10-14-2022, 11:41 PM
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Do they have the same shock package? Did your friend build it with the same springs, oil, and shock length?

Are the arms more free in one car than the other?

Does one car have tweak and the other does not?

Do you test them in the same conditions back to back?

Radio setup?
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Old 10-14-2022, 11:48 PM
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Originally Posted by trilerian View Post
I would figure out who built the one that drives the best and have that person rebuild the other.
I built the one which is understeering and overheating tyres.

I've rebuilt the one that is handling well, except for the shocks. I'll try those shocks on the other car once I can get a chance to get to the track.
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Old 10-14-2022, 11:55 PM
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Do they have the same shock package?
Yes, both have drilled shock caps, pistons and o-rings

Did your friend build it with the same springs, oil, and shock length?
Same springs and oil weight but different brand oil

Are the arms more free in one car than the other?
The arms move freely equally between the 2 cars. So freely that they bounce.

Does one car have tweak and the other does not?
Both have no tweak which has been double checked.

Do you test them in the same conditions back to back?
Both have been tested in the same conditions (on the same day).

Radio setup?
We use different radios but the total steering angle is set the same.
[/QUOTE]
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Old 10-15-2022, 01:57 AM
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Can you swap the shocks?
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Old 10-15-2022, 05:37 AM
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Originally Posted by IJsbier View Post
Can you swap the shocks?
I can.

That's the first thing I'll try on the next test day.
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Old 10-15-2022, 07:25 AM
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Different brand shock oil would mean for sure difference viscosity.

even if they both say 450 or 45wt, the difference could still be 20% depending on the brands. 5-10% could well be enough to make a rather large difference in track feel.

https://site.petitrc.com/reglages/OilChart.pdf
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Old 10-15-2022, 07:39 AM
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You mentioned different radios. Different receivers and servos also? Checked the expo and speed settings on the radios?
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Old 10-15-2022, 08:31 AM
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Originally Posted by dontfeelcold View Post
I have 2 touring cars.

Same chassis and electronics.
Same setup, body shell and tyres.
1 was built by me, the other by a friend.
I did the final setup on them before they hit the track for the first time.

The 2 cars have a different feel about them when driving them on the track.
Laptimes are within 0.2s

1 chassis is smooth into through and out of the corner. Easy to hit lines consistently.

The other is very reactive to steering and throttle inputs. It pushes a little into and through the corner which makes it a lot harder to consistently hit the same lines.
It also overheats tyres making the car very difficult to drive after a couple of minutes into the run.

2 Questions;
1) What could be different between the 2 cars to cause the difference in handling?
2) What things would you recommend I try?
what is the brand?
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Old 10-15-2022, 04:12 PM
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If the shock oil other folks mentioned doesn't get you to par. Swap the tires between vehicles and test. One of the fast guys at the track I run at chased his car for a couple days, rebuilt the car a couple times including changed chassis plates, all kinds of settings and finally tried a different set of tires and his lap times just dropped. Spec tires so same brand of tire, part number, etc. But they handled very different.

Radio Man
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Old 10-15-2022, 04:25 PM
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Originally Posted by dontfeelcold View Post
What could be different between the 2 cars to cause the difference in handling?
Anything.

What brand/model cars? What radio?
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Old 10-15-2022, 06:42 PM
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The chassis is an ARC R12.1

Different radios, (Futaba 7PXR and 3PM 2.4Ghz), receiver and servos. The servo's have been swapped and nothing changed.
Transmitter expo and speed settings are the same. I'll be swapping transmitters too when I get the chance.

Tyres have been swapped between the cars in back to back runs.
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Old 10-15-2022, 07:44 PM
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Huge difference in radios. The feel of the 7pm would be way different than the 3pm
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Old 10-15-2022, 08:16 PM
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Originally Posted by dontfeelcold View Post
The chassis is an ARC R12.1

Different radios, (Futaba 7PXR and 3PM 2.4Ghz), receiver and servos. The servo's have been swapped and nothing changed.
Transmitter expo and speed settings are the same. I'll be swapping transmitters too when I get the chance.

Tyres have been swapped between the cars in back to back runs.
ok use the ARC thread
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