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New 1/8th 4WD basic class ???!!!

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New 1/8th 4WD basic class ???!!!

Old 12-11-2019, 08:27 AM
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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.

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Old 12-11-2019, 10:00 AM
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getting one after christmas to run in the spring.
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Old 12-11-2019, 10:23 AM
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Nice, you'll like it. Congrats
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Old 09-29-2020, 03:32 PM
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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.
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Old 09-29-2020, 05:15 PM
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Im going to start tires at 66 front 73 rear as I already have them cut. Ill play with the pinion / spur combo and get somewhere close to this starting roll out of 66mm



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Old 09-29-2020, 05:17 PM
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Here is an older gear chart. Tire diameter up top. Believe stock spur on evo is 53, bottom portion



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Old 10-06-2020, 09:41 AM
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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
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Old 10-11-2020, 02:58 AM
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Anyone have the internal ratios for the various buri cars?
intersted to see the amount of overdrive to the front.

thanks
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Old 10-15-2020, 06:04 AM
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Working on the body



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Old 10-17-2020, 03:55 AM
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Originally Posted by Julius View Post
Anyone have the internal ratios for the various buri cars?
intersted to see the amount of overdrive to the front.

thanks
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%. Im 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 thats easier to drive?

At some point I also thought perhaps Serpent just used pulleys which they had from existing cars, but I couldnt 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?
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