RC10Talk - The Net's Largest Vintage R/C Community

Incredible_Serious wrote:

ChisaiKuso wrote:Having a body on the car or not having a body on the car is not going to make much difference when accelerating. The downforce provided by a body is only generated when the car is traveling at speed.

ChisaiKuso wrote:I hope this helps some, but keep in mind that it's only my $.02 based on years of oval racing at a sponsored level.

Sorry mate, I bow to your sponsored oval awesomeness. I based my ideas on my own hack running of a pan car in the street, in which I had exactly the same experiences with my inexperienced, heavy throttle fingered hands as Barnfind seemed to be explaining.

Alex

LOL! Don't bow to me, and don't apologize either. I hope that my comments didn't come across as being directed at you. They certainly weren't meant to be an attack. We're both trying to help out a fellow RC enthusiast, and that's a positive thing all around.

Barnfind wrote:haha yes I actually did that today and then that's when I ran it and it was going crazy in the garage

I think ChisaiKuso nailed it right...


"try" in the (dusty) garage
"basic" electronics, probably worn brushes (so friction until BAM the motor spins)

combined with a 25yo pan car (that might be straight or might not), it will do donuts every acceleration, regardless of anything else.

Other factors to consider: 20yo AM electronics don't like garages... chances are you also have the steering servo twitching as you throttle it too... won't help

Paul

Barnfind wrote:the battery I use is either a six or seven cell old NiCad battery.

I'm guessing you have this mounted on either the left or right side longways?

romulus22 wrote: I'm guessing you have this mounted on either the left or right side longways?

I had the battery going across it in the rear of the car.

ChisaiKuso wrote:What sort of surface are you trying to run the car on? If it is unprepared asphalt your problem is simply a lack of traction. The fine dust/dirt that settles on streets and parking lots makes getting traction with foam tires nearly impossible. This is why race organizers spend so much time washing or blowing their track surfaces clean. Sometimes things like soda are even sprayed on the cleaned surface to make it sticky.

I was just trying it in the garage I didn't think all that mattered but this is my first on road car and I don't know anything about how to run them I'm more of an off road guy but I had this laying around in pieces and thought it would be a fun build. also I have no idea about how to balance the car right and the suspension so any help with that later would be great.

Thanks for all the help so far.
Daniel (barnfind)

Looking it the tires and the fact you said your running it on the garage floor, I would say it's a lack of traction. Try running on carpet track or paved/clean road, it should hook up better.

Good Luck!
Q

Also, go smooooooth on the acceleration. Don't slam the throttle like you would do on an off-road car or 4WD sedan. Then you should be able to run straight on a dusty surface or with old tires (even with a Pro10 on brushless).

You'll still spin out when you try to take a turn at speed, so usually we dial out like 40% of steering using the steering curve on our transmitters, so the car is less twitchy. Try to run the car with close to zero toe-in on the front wheels.

And I will suggest that you get a good body for the car, as it can make a difference once you're at speed.

Other possibilities:
- your chassis is tweaked. This can be a matter of unequal springs in the front suspension, but also a warped chassis plate or t-bar.
- your chassis bottoms out once you push the throttle (center shock too soft or ride-height too low)
- front tires with too much grip/rear tires with too few.
- ball diff too loose. If you keep setting it right and it loosens the moment you start driving, consider putting in a real thrust bearing and using a locknut.

check the cappacitors on the motor if their loose it make servo stutter too.don

So after spending some time today working more with the car and trying some of what everyone has told me to try I did get further and I was then able to actually build up some speed before spinning out. I changed the tires to foam ones which seems like it helped a lot and tried my best to level the front arm as much as I could. after testing it and realizing that I wasn't having so much trouble with the straight but with turning I decided to look into the servo and steering. Upon doing this I discovered the problem! It was so obvious I was surprised I didn't notice it before but the front wheels were to wide and when I turned they wound hit the rear of the arm and pretty much stop the wheel from spinning so im pretty sure that is the problem and I will now look into narrower tires for the front.

Try flipping them around, some have an offset

gomachv wrote:Try flipping them around, some have an offset

didn't even think of looking at that haha thanks for the tip

The car is now fixed and works great. Still spins at high speed but a body should fix that. I was looking into on road tracks and oval tracks but the closest one is about 2 hours away so that is out of the question. I was wondering if I could just run it on my street and the occasional parking lot if I would need anything special like tires or anything? I have foam ones now that were corking fine on the driveway after I swept it off and blew it off with a leaf blower.