Tuning times faster with 3 cars

[Old Geeezer]

I have been tuning my grandson's scout cars and have noticed if I run three identical cars the times for all three are .02 to .04 faster. if i run any of the same cars in same lane by it self it is alway .02 to .04 slower. Has anyone notice the same. 3 lane BestTrack with Microwizard K3/ESS (set up as 35' for scouts).

Mystery Finally Solved, While tuning for March Madness today I noticed one of my cars was bouncing when the start gate dropped. Turns out that when I had multiple cars running they were equally sharing the energy of the pins hitting the bottom of the cars, then when runing one car all the force was applied to that car and slowed it down. Once I got the start gate so it did not bounce back up then the times for a single car dropped .02 to .04 and were also the same when running all three cars.

 

[Kinser Racing]

They're drafting off of one another.

 

[Old Geeezer]

Don't think so as I have also tried using two big slow cars that are always at least a car link behind the fast car entire race. I'm thinking vibration maybe???? Very Strange

Also can get same results using one Dummy Car (any car faster or slower) and the one I'm testing

 

[Kinser Racing]

They are subject to a lot of vibration from the other cars, but it usually has the opposite effect, they slow down. Although I have seen them gain speed lately. You may be right.

 

[Crash Enburn]

Duh! More mass = more gravitational pull = faster speeds!

 

[Quicktimederby]

Sounds like a good problem to have. When my cars are in traffic they slow .001-.005 depending on the class. And if the car I am running against has a lot of wiggles it can be way worse.

 

[Old Geeezer]

It is a good problem to have if it translates to the track you are racing on. Also if you could figure out what is causing it maybe you could duplicate it on other cars. My money is on track vibration, may try 1/'4" rubber pads under the track joints/leveler areas.

 

[Kinser Racing]

Duh! More mass = more gravitational pull = faster speeds!

Galileo, the father of modern physics, already proved this to be inaccurate over 400 years ago. /images/boards/smilies/biggrin.gif

 

[Downhill]

Dynamat is used in vehicles as a sound barrirer and works great on the bottom of a track to reduce/eliminate vibrations. If you have a car stereo install shop near by, you should be able to pick up what you need at a good price.

It is a good problem to have if it translates to the track you are racing on. Also if you could figure out what is causing it maybe you could duplicate it on other cars. My money is on track vibration, may try 1/'4" rubber pads under the track joints/leveler areas.

 

[5KidsRacing]

Peel & Seal from Lowe's (http://www.lowes.com/pd_154017-81326-PS625_0__?catalogId=10051&productId=1018733&UserSearch=roofing+peel&Ntt=roofing+peel&N=0&langId=-1&storeId=10151&rpp=24) is a cheap alternative to Dynamat. Similar qualities, way cheaper. My track is very quiet.

 

[Guest]

NO NO NOOOOOO!!!!!!!!!!!!!!!!!!!!!!!!!! When you have the opportunity to tune against anything, fast or slow is key to learning the art of tuning. When I have the opportunity to get up to MWD's to tune on a single lane, it was at first very confusing. At first like many of us when we first get into this thing, we are wondering why it is that our car was running .100(or whatever) faster/slower when I tuned it for the race? Answer, the race track will never give you "exact" times that you get with the exact same track you tune on, too many variables. Thus, Kinser is right for the most part. "Dirty Air" is created by all cars. You could take Kinser's Street Stock car( super sonic car ) and run it against 2 other cars that are dialed in to the race track perfectly..no wiggles at all from either car. But lets imagine the other car has a cog of 1 inch, off the hill it will smoke our Champ but as K-18 smokes passed this other car at the 28 ft mark of the track, he will have to do so going through the air being deflected by the slower car..Period. With a 1-lane track(like MWD's) the way we simulate dirty air is to lightly tap the track at the starting gate before dropping the car off the hill. This would also back up OldGeezers theory of vibration. But it has been my experience that a car that wants to do the shake rattle and roll will not be out front even off the hill. Yes, vibration is an issue if a track has not been set up to off set this issue, such as scout tracks albeit a Best Track, without antivibration being part of the way the track is set up it will be an issue even for the best builders here at NPWDRL. The fact we are running sise by side now has lessened the effect of dirty air as well as an vibration we deal with. Didn't mean to ramble on, just trying to help out. Take care men,
Sparky

 

[Crash Enburn]

Duh! More mass = more gravitational pull = faster speeds!

Galileo, the father of modern physics, already proved this to be inaccurate over 400 years ago. /images/boards/smilies/biggrin.gif

Thus the "

" ...

 

[Kinser Racing]

Duh! More mass = more gravitational pull = faster speeds!

Galileo, the father of modern physics, already proved this to be inaccurate over 400 years ago. /images/boards/smilies/biggrin.gif

Thus the "

" ...

Got ya! You'd be surprized how many people still believe that. /images/boards/smilies/smile.gif

 

[Old Geeezer]

Mystery Finally Solved, While tuning for March Madness today I noticed one of my cars was bouncing when the start gate dropped. Turns out that when I had multiple cars running they were equally sharing the energy of the pins hitting the bottom of the cars, then when runing one car all the force was applied to that car and slowed it down. Once I got the start gate so it did not bounce back up then the times for a single car dropped .02 to .04 and were also the same when running all three cars.