14.2 second 1/3 mile? (oval)

So there's a 1/3 mile oval track about 25min from my house called Lake Geneva Raceway.. ie. http://www.lakegenevaraceway.com/

They've been open for 44 years, but this is the last year. The track will be torn down and houses will be built. I've gone to this track almost every saturday night since I can remember. My dad used to race there as well.

The racetrack decided to try and break the track record which was a 14.9. this past saturday, they had an outlaw sprint run a 14.3 second lap. If I calculated it right, that's ~80mph consistant.. right?

My dad knows the track owners from his racing days, and will talk to them about me running an rc to try and set the record. I think a car that can hit 90mph on the straights w/ a decent it doesn't scrub to much on the corners will easily take the record. I've been looking at a few options, but am not sure which route to take..

something like a 1/8 scale converted to nitro, would greatly improve handling.. I even thought about the SuperRS4, but the belt design worries me, and will limit motor choice without designing/machining alot of complex parts. larger scale also means not just weight, but mass. i'll need to be able to go around the corners at near full speed. the track is banked, but not nearly as much as say a super speedway.

so far, my plan is to go with a TC3 ; again, i've run lots of power through the tc3 before, and had to put alot of money into making it more durable, but I usually bashed it harder than any other rc I've owned. For this attempt, I'd have to be very easy on the throttle, and make sure the car's dialed..

I've got a Mtroniks Monster controller and a feigao 380c-6l that I'll be selling, and buying a Quark 125b. throw in my 540c-9l and 16 cell, and I should have enough power to obtain the record. my worry is handling. I havn't found a decent "large" scale onroad electric, or nitro that can easily be converted to electric.. other than Rotary Rocket's Landmax, but I'm not sure about the weight, especially of the tires. and since i'm not very knowledgable w/ larger scale vehicles, i'm not even sure what body styles would be available.

please, let me hear your opinions. anyone have experience running on a 1:1scale 1/3 mile pavement track? or anything similar? anyone get a 1/8 scale past 80mph before?

also, does any one know if the emoli cells will astroflight 109d's?

didn't know if i should post this here, or the brushless forum.:dft001:

[coolhandcountry]

Have you though about lipo? It would be lighter for a run like this.

[MetalMan]

Hey DualBL (just remembered that's you). It's Nick, right? I'm the same guy as tcolesen over on RCZ.

The Emoli cells will charge up on AF109s. But, the most you can get out of Emolis in a burst is about 60amps, at which point their voltage does not hold too well. Even at 45amps their voltage isn't all that great, but anything under that is fine.

BTW, how'd your last project vehicle come out (was it the MT2?)?

[captain harlock]

How about converting a Kyosho Evolva 2005 into brushless?
These are 4wd pan cars which 1/8 with the lightest drive train in its class.
A 1940/6 with 5-6 lipos will surely make it fly.
If you are going to attend this project, it will be one of a kind.

[Serum]

I think you need way more power than 16 cells to reach the 80mph. But you won't reach a record with an 80 mph car.. this is an average, so you need to peak to a higher speed as well. Lets say it takes you 2 seconds to get to that speed. meaning less time to do the 1/3rd mile.


you say 14.2 in 1/3rd of a mile, so 42. equals 1 mile. 3600 seconds equals 1 hour, so 3600/42.6=84.5 mph. (again, average)

you are going to need a lot more cells and a perfect flat road to keep it going straight.

I don't want to burst you bubble in what way ever, but i think you need at least an 8S flightpower 3700 pack. They stay above 3.1V@50C discharge peak. which means that one single cell can deliver 573W. So 8 of them can do 8X573W peak. that is a rough 4500 watts of energy. that's more like it, but still i think it will be very hard to get the speed record done.

that in combination with an MGM 24160 would be a nice combo and a 9L won't pull that sled a 2240 would be a nice motor to use.

The problem is, you don't only need speed, but you have got limited time getting to that speed! and that is the reason why you need all that power!

coolhand country, I have indeed thought about lipo.. I own two AF 109d chargers w/ a psu, and have three 2s1p polyquest packs, but have never used them. I'm planning on trying the 16 sub-c's, and if it's too much weight, or not enough voltage, I'll look further into lipo/liion/ect.

tcolesen, thanks for the info.. still not sure on what batts would be best.. but I first have to figure out what vehicle to run, and get it configured, then i can change out batteries/motor later.
the MT2 project is still sitting here.. Andrew at CFR cut me out some test pieces to make sure the critical measurements were on.. they weren't, but only the rear diff didn't line up w/ the center brace. I designed a very small simple part to connect the two, and the design is now finished. the reason it's still sitting, is $. I got quoted ~$300, which isn't bad, but enough for me hold off on that project right now. in the meantime, I had bought a Academy SB Sport V2 4wd buggy to race with. I put the 380c-6l and 8 cells in it, and didn't even get through practice before both front and rear diffs were gone. It's now going to be sold. I went ahead and bought one of Andrew's $25 motor mounts, so I can run the MT2 at least with the stock chassis in the meantime, but have to find all the random parts for it that became scattered around my room during the design phaze :P

captain harlock, I've actually designed a 1/8 nitro converted to electric, but lost my work on that hard drive.. the problem, is I don't own a 1/8 onroad, and I've never even seen one assembled up close. I used the hi-res renders of a Serpent car.. the driveline on these cars are alot more complex than say a 1/10tc.. i guess i could buy/build one, and then get the measurements i need to design a feasable motor mount and chassis..

Serum, I know you know alot more about brushless than I do, but I'm not sure about your power recomendation. I've hit 75mph with a tc3 running a Basic5300 on 12 "sport stick pack" cells, and it was controllable even topped out in a parking lot.. on a prepped and banked track, I don't doubt i would be able to run 70mph around the track w/ the setup i had, and that included 6 of the cells being simply ziptied to the rear bumper. I think a 540c-9L on 16 cells won't have a problem supplying the power. I'm not sure if your familiar w/ Cliff Lett? http://www.rccaraction.com/articles/need_speed.asp His tc3 setup was 14 2400mah subc cells, and a custom brushed motor w/ a 12t armature and stronger magnets.. he hit 96.4mph. I don't see why a 540 9L on 16 cells couldn't run equal to that. I would only run this for about a minute or two at a time, I can and will overgear it. I don't need a tried and true power house, I only need ~1 minute of full power. also, multiple laps can be run, and i don't need to worry about accelleration, as i can be rolling accross the line at 90mph when the clock starts. the way they had the sprint run, he did three warm up laps to get heat in the tires, and get the motor up to temp, then did two "fast laps". first being 14.90 and the second being the new record at 14.3. I'm not saying your wrong, as you said "and that is the reason why you need all that power!", you'd be correct if I had to start from a stand still.

[captain harlock]

Well, a TC3 is a very good chassis for high speeds or any other 4wd shaft driven touring car. The market is full of them.
Also, there was a person who used a Hacker master controller with a 1920/5 motor and 12 nimh cells and he was able to easily hit 86mph.
With 4s lipos and let's say a 1930/5, you can reach the 90s in an instant.

[Serum]

I really didn't knew it was a rolling start.

[BP-Revo]

I would think a motor with more Kv would be better at top speed. Something like a 7XL, or even just a 7L (dont they have 6XLs?).

Anyways, that, combined with two 3s lipo's (or a 2s and 3s for a total of 5, if the controller doesnt take 6s). That should be well enough to set a record I would think.

[squeeforever]

Actually, yes, there are 6XL's.

[Dafni]

Your best bet would be a converted 1/8 onroad car, such as a Mugen or a Serpent. Keep the 2-speed. Even the nitros can do up to 80mph. Those cars just stick to the track.
I would look into a Serpent.

Left Mugen, right Serpent. And they are huge, 8th scale.

[jhautz]

Originally Posted by BP-Revo

(dont they have 6XLs?).

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1

[JThiessen]

Is there a real reason to use all wheel drive for this? Quick cornering is really not a concern in this application - your only turning left.

Also, you could put more of the batts to the left hand side of the car to improve the centripital forces during cornering, but you'd also have to comp your steering for getting down the straight. How much straight is there on that track? Enough to worry about?

Your going to want really slow steering response - a slight over steer at 90 will spell certain death!

You MAY want to be particulary careful with your aero control at that speed. I'd put adjustable screws at your body attach points to be able to screw your body up/down.

I think this is very interesting (I'm a huge NASCAR fan). I look forward to seeing your results.

[jhautz]

Make sure you get this run on video when you make your attempt at the record. I'm sure we all whould love to see it.

[Mike.L]

what about a nitro 4 tech 3.3?