Author Topic: Car handling question  (Read 1929 times)

Offline Legend732

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Car handling question
« on: April 05, 2018, 01:54:58 pm »
Still learning these cars and have a question.  After about halfway thru the main, my car seems to get really loose and is a complete different car.  I start to get loose in the middle and loose coming out.  The rear end wants to come around on me.  Is there anything I can do to help the car be more consistent thru the main?  Do I need to start with a little higher cross weight?  %48.5 to start race.  Is this normal and I just need to drive it or what can help?  What is causing it?  Tires???

Thanks


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Offline justfreaky

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Re: Car handling question
« Reply #1 on: April 05, 2018, 02:11:44 pm »
Not a chassis guru; But I would say to increase the cross weight as a start. Say 51- 52%. ???

Steve
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Offline Legend732

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Re: Car handling question
« Reply #2 on: April 05, 2018, 02:38:28 pm »
Yes I agree with you and appreciate your input.
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Offline Legends57x

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Re: Car handling question
« Reply #3 on: April 05, 2018, 04:57:25 pm »
Also, make sure rear end housing is not bent and if not bent, rear to be square in car and left side wheel base 1/16" longer than right side. This will make a huge difference if set up correctly. Increasing cross will help, but you will still be wrestling with the car if rear end is out of whack.

Hope this helps!
Mark Ritger
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Offline Legend732

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Re: Car handling question
« Reply #4 on: April 06, 2018, 11:10:21 am »
Thanks for the help.  I do know the rear end is not bent and I do have it square and wheelbase is correct.  Think I am going to up the cross weight %.  Thanks again
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Offline fastfred02

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Re: Car handling question
« Reply #5 on: April 06, 2018, 11:26:15 am »
If you're on asphalt, I'd think that tire temps might help you understand the story as well.

Offline Legend732

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Re: Car handling question
« Reply #6 on: April 06, 2018, 12:28:45 pm »
Great point and that is something I am going to monitor.
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Offline robbiejohnstonracing

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Re: Car handling question
« Reply #7 on: April 08, 2018, 07:50:08 pm »
Are you running nitrogen or air?

Offline justaoke

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Re: Car handling question
« Reply #8 on: April 09, 2018, 11:58:54 pm »
Do you have a "tight-loose"??  To much wheel input coming out-(pushing) Then it snaps loose as it comes out??

Offline Legend732

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Re: Car handling question
« Reply #9 on: April 11, 2018, 10:06:48 am »
Sorry for the delay and did not see your guys post.  I am running air in tires but have talked to other racers and the way to go is nitrogen?  As far as how the car handles half way thru the race, it is loose in the middle and wants to bring the rear around. 
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Offline justfreaky

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Re: Car handling question
« Reply #10 on: April 11, 2018, 12:54:06 pm »
Nitrogen is expensive and not everyone has some just sitting around in the garage. Most racers just use air in their tires. I think you will be just fine doing the same. Have you raised the cross weight in the car yet and tested? Wondering the result?

Steve
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Offline Legend732

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Re: Car handling question
« Reply #11 on: April 14, 2018, 11:50:31 am »
I have not tested yet and will be testing in 2 weeks.  Let you know. 
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Offline ZForceRacing01

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Re: Car handling question
« Reply #12 on: April 17, 2018, 02:14:56 pm »
Your car will get looser during a run. Tire Pressures come up which increases rear spring rate a tad plus your burning gas so loosing rear weight. A gallon of gas is about .5% of the car. If you can feel .25 of Cross, I'm sure you feel .5% of rear weight.
These cars run very loose to be fast. The winner is usually sideways off the corner for the second half off the race.

I think Freddy is on track, check your tire temps and wheel input. I know you run a lot more cross then I do so I would be looking into that tight/loose condition. Right as your on the gas to set the car off the corner the thing will snap loose.

IMO, a loose off race car is a more gradual feeling. But when your tight / loose, it just wants to snap around on you.     
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Offline Legend732

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Re: Car handling question
« Reply #13 on: April 18, 2018, 02:47:52 am »
Thanks again for your input, it's very helpful.
Funny car driver looking to race a Legend