Speed Challenge Car
 

Well, my LHS is orgainishing a speed challenge session somtime next month. It's a drag race style challenge between 2 cars. Loser will get eliminated. Details like the length of the track, where the drivers going to stand are not very clear. What is known is that there are no restriction to the type of vehicles that one can bring to the competition. Well, it has to have wheels & use the wheels to move around.

I have new old stock 1/8 buggy chassis lying around that I think I can convert into a GT style onroad vehicle for this speed challenge. Most of the guys will be using 1/18 scale sedans & there's even a 1/18 scale offroad truggy in the mix. I think there are some who will bring their 10th scale electric sedan to the event as well.

I have bought this shell for use on my buggy :

http://www.prolineracing.com/images/...rge/599_1_.jpg

These Losi tires will be used on the GTfied buggy :

http://images.amainhobbies.com/image...losa17768b.jpg

I have also purchased various GT parts for Kyosho to use on my NOS buggy. I am asking Mike to sell me a Lightning Stadium mount & a Kyosho mount to fit one of them into the buggy. This will be a one speed buggy. I am targeting to use a 6S lipo with 25/46 gearing & possibly a Medusa 70mm 1600KV motor. With this setup, theoretical top speed is around 82mph (132km/h). Hope this will be ok to beat the competition.

Wish me luck !

Regards,
Joe Ling

http://i198.photobucket.com/albums/a...g39/buggy1.jpg

http://i198.photobucket.com/albums/a...9/sacker04.jpg


My first BL conversion. Essentially, I'll be using the exact same type of chassis for the upcoming Gt conversion.

Regards,
Joe Ling

forgot to mention that I'll be using a MMM

http://www.hobbycity.com/hobbycity/s...6750140N-6.jpg

Battery

IMO you will need more...never underestimate your competition.....I have seen a few 1/18 scale cars go in excess of 100 mph...Good luck!!

Any idea if those new Losi tires are belted like the OFNA and Ipanema tires?

Yeah, I'm hoping I can get away with the speed I hope to achieve. I really don't want to have a spend an order of magnitude more...:cry:

Not sure about the tires. I should have bought some belted ofna tires too as these were quite expensive.

Regards,
Joe Ling

Jzemaxx has a few build threads with some high speed vehicles, one being a XTM monster truck and a 1/8 scale buggy both did about 80 mph

There are a bunch of 1/8 conversions out there. I did one and so did these guys.

Good luck... IMO its gonna be hard to beat one of them little 1/10 on roads in a drag race. Those things just scoot!!! The power to weight ratio on them is insane. Just put a 3 cell lipo one with the right tires and in my opinion a little more weight than you would use for a road race to increase the traction for better acceleration and you will be all set. Tyring to make a 1/8 accelerate like the 1/10 will be tough.

If you insist on going with the 1/8 find the widest and softest tires you can get on the thing for maximum traction. Dont forget the traction compound for the tires too, and something to heat the rubber with right before you toss it down to run it. Traction will be your biggest challange in straight line acceleration.

this might work for you
 

your best uption would be to try and use an onroad 1/8 and convert that to brushless ...... sick speeds and may even match the 1/10 for excelleration.

I have 2x of the prp's that i'm gonna convert myself....

there wy less expensive then the megens, kyosho,and serpent, but performance is the same :-)

http://www.powerracingrc.com/images/xr8/xr8main.jpg

Well, went ahead & did it anyway :

http://i198.photobucket.com/albums/a...39/speed06.jpg

http://i198.photobucket.com/albums/a...39/speed04.jpg

http://i198.photobucket.com/albums/a...39/speed09.jpg

http://i198.photobucket.com/albums/a...39/speed08.jpg

Motor - Tekno Neu 1515 2200kv

ESC - MMM

Battery - 6S 20c 500mah lipo

gearing - 25/46

BTW - that's an Australian redback paint scheme :-)

Very clean and sleek looking Joe. Love the Red Back theme.
Good luck with the drags.

That looks great! I'm looking forward to those vids... :lol:

remember the laws a motion though....:whip: you need more room to stop than a 1/10 car

I'm with Jhautz.

i would say use some punch control, if you dont your gonna spin alot off the line. then you will be sideways. you might be a little slower off the line but once your up to about 5 mph and full power flow that thing should be pretty fast.

Another thing you might want to consider is putting in a gyro to help keep the car going straight.

It will be difficult to beat a 1/10 with a 1/8, that's why I think they should have different classes.

Regardless, you have a really nice road car right there!

I also agree with these 2 guys. I'm working on my Vendetta, trying to get the 62mph (100 km/h) with that thing. I'm running mamba 8000kv, 3 cell LiPo and a Quark Competition 80B ESC. That thing really flies! But it's SO DAMN HARD to control it! I always have to start really slow, or else it will spin, and if I go something like 40-50 mph and trying to go slower the car will spin most of the time :lol:

So again: Traction will be the biggest problem :yes:


EDIT: What's a gyro? (My english isnt very good)

Gyro's are a waste in a dragrace. I've seen 1/8 against 1/10 and both can be equal in a132 feet dragrace. But if a purpose built dragster is in the mix, you can forget it. However if it's a 300 feet race, then anything is possible.

so does that protoform body fit directly onto an 1;8th scale buggy chassis?

any vids of this onroad conversion? cooL ride!

Guys,

Thanks for all the comment.

1) I realised that traction will be a big factor in a drag race. In general, the performance of the tires will affect the performance of the car. I have some proline road rage but I suspect these will balloon excessively if i use it. I will use some punch control to reduce wheel spin. I am also thinking of using some traction compound (like sugar water ?) but have no experience in this area.

2) The suspension & diff oils also need to be changed. Right now, I think the diff are all filed with grease (came with the kit) & not sure what the shock oil is like. I will most likely increase the weight of the oils in all aspects

3) Gyro & stuff - steering rate will be decrease, toe-in will be increased & steering end points reduced to help with straight line stability. Forgot to mention earlier that I will be using a Futaba GY240 head holding gyro in rate mode to keep the car pinting straight

4) The protoform body does seem to fit nicely on my sacker which is a near copy of the older Kyosho & HB lightning 1

Regards,
Joe Ling

I wouldnt turn down your steering.. definately a gyro but you gonna need a bit of steering to counteract the loss of traction


edit- maybe alot of exponential so its easy with minute adjustments and has all the throw when you need it

I don't need a gyro with either the gtp or crt.5. If you set your car correctly, you'll track straight everytime.
The sugar water or grape soda will only work if the track is wiped, blown clean. If you use foam tires, reduced honey might work. If it's on grainy concrete, reduced honey will work as well on launch.
Punch control is in the finger in 1/8 scale.

I'm primarily an offroad guy & so I know nothing about onroad stuff lie faom tires, traction compound. So, this info is good :yes:. I think I will be running on bitumen (i.e. road).

Well, I'll just have to try it & figure out something