Time to Bump This Up. Checking in to see who is still running the Car, not as a Drag racer! But actually on a Track.

getting one after christmas to run in the spring.

Nice, you'll like it. Congrats

After years away from 1/8 (was into 1/8 gas) this whole pan car thing has me interested due to the simplicity and cleanliness. Have finally got three quarters of the way through the build of my 2.1 Evo. Does anyone have a starting reference for roll out and a starting point for tire diameter for these pan cars on a mid size 1/8 track? Much thanks in advance.

I’m going to start tires at 66 front 73 rear as I already have them cut. I’ll play with the pinion / spur combo and get somewhere close to this starting roll out of 66mm

Here is an older gear chart. Tire diameter up top. Believe stock spur on evo is 53, bottom portion

Buri racer e2.1 evo on the right (bottom) and the e1.3 evo on the left (top). not sure why images keep rotting... ill figure it out soon

Anyone have the internal ratios for the various buri cars?
intersted to see the amount of overdrive to the front.

thanks

Working on the body

I used to have a Buri E1.2. On the E1.x the ratio of the rear to front pulley was 31/28.
With the common size of tire diameter 70mm rear / 64mm front the overdrive was around 1%. I‘m not sure about the E2.1, but I would assume that it is similar.

This is why I was very surprised when I found that the Taipan has a much larger overdrive ratio. With the rear and front pulleys being 28/24 that amounts to over 6% of overdrive with 70/64mm tires. When I initially started running the Taipan I thougt I should aim for a similar overdrive ratio than what I was used to from the Buri. Also I read in various places that the nitro folks typically run no more than 3% or maybe maximum up to 5%, so the standard setup of over 6% seemed a lot. Consequently I trued down the front tires to get back into the range of no more than 3%, but that cost me a lot of front ride height and more importantly it shortened the possible run time which I could get out of a set of front tires, compared to the rear.

So I went back to running 70/64mm and it seems to work fine. But to this day I still wonder if this large overdrive is intentional by Serpent and why. Perhaps the unsprung rear axle setup and lower weight somehow requires more overdrive to get a car that‘s easier to drive?

At some point I also thought perhaps Serpent just used pulleys which they had from existing cars, but I couldn‘t find another recent Serpent 1/8 that uses a 24 tooth pulley anywhere in the drive train, so that part seems to be custom designed for the Taipan. Which makes me think, that the large overdrive is intentional.

What are your thoughts on this?

Hi,
the standard BURIs E1 and E2 internal ratio is 31t rear to 28t front - so we run with standard set of tire diameter 70 / 64 mm, with smaller tires maybe 67 / 63 mm

BURI-Racer offers optional pulleys either 3d-printed or aluminium with less split: 30t rear and 29t front - we run 70 / 68 mm tires or even smaller with 67 / 66 mm, so we can run longer with the front tires...

compare with the other brands: ARC: 36t rear / 34t front, Corally: 32t rear / 28t front, Capricorn: 31t rear / 28t front
in my opinion the Serpent ratio 28/24 is by far too much...

Hi to all,
I just launched the latest versions of my 2 cars with a lot of improvements:
- the side belt type BURI-Racer E1.4 and
- the midle belt type BURI-Racer E2.2
just look at attached file for more detailed information - the new website will be unlocked in the next days




BURI-Racer E1.4 roller chassis

full equipped BURI-Racer E1.4

BURI-Racer E2.2 roller chassis

What's the difference between the 2 belt layouts?

The side belt version E1 is the more flexible one regarding equipment: you can install all battery types from 4s block to 2x 2s stick or shorties. There is also more space for the motor and the controller... This version is very smooth to drive, with low practice you will be quick to get fast laptimes.

The middle belt version E2 is more limited: you can use only 2x2s sticks or shorties. The maximum lenght of the motor is limited with 68mm and for the controller size Hobbywing XR8sct is recommended.... This version has a rather agressive driving style, so you have to get used to this. It needs a bit more practice and fine setup to reach fast laptimes.

^Interesting. Thanks for the info. Can these handle bumpy tracks? (or atleast bumpy as can be for normal 1/8 full suspension GP cars)

Can it keep up with the normal cars performance/run time wise? I'm toying with the idea of getting one as a cheaper alternative to the full fledged affair.

Rear spool and front one way I assume?