- B6.2D Weight Bias Quick Reference Guide -
The TeamAssociated B6.2 has a huge range of tuning parts to allow the weight distribution of buggy to be dialled into any surface ranging from slippery dirt to mega grip carpet, but with so many options it's easy to get confused as to how much effect each change has. To make this easier, Ive put together some quick reference charts showing:
I hope this helps when it comes to deciding which part to tune the next time you are at the track!
The relative effect of each tuning parameter
The overall weight bias tuning range of the different configurations we have (standup, layback, laydown, shock forward, different chassis length).
Refresher on weight distribution:
When you look at chart 2, you will notice the standup transmission has a much greater range of adjustment as the battery can be moved so much further on the chassis. For very sandy dirt tracks ive found a weight bias of around 36.5% works well which cant be achieved with layback or laydown. But on most tracks we've been finding a bias of around 38.5% -39.5% works well which is in the range of the layback with the rear arms dremelled forward and waterfall brace removed even without adding a brass C block. If you need more forward bite at the expense of corner speed the brass C and D are easy to add. For astroand carpet it seems those setups need closer to 42 or 43% which is why you see laydown transmission and brass front bulkheads. (For reference, our older rear motor cars were around 34-35%.)
Weight distribution is measured in how much % of the weight sits on the front axle (eg 40% means 40% is on the front tyres, 60% on the rear tyres)
Moving weight forward, adding weight to the front or taking weight off the rear all move the weight distribution further forward in the car
Rearward weight bias gives more forward traction but less on power steering and can give a 'pendulum' feel in high speed corners -> more suited to low grip / tight tracks
Forward weight bias gives smoother high speed cornering, better on power steering, better jumping but worse forward traction -> suited to high bite / flowing tracks
Adding weight further out from the axles tends to slow down the response of the car (it adds more yaw inertia). So generally for example if you want to move weight bias forward its better to take any weight off the rear first, then shift battery forward, then add weight to the front. If i want to add weight i use plates under the battery which hardly changes weight bias and keeps the weight central.
(note for the B6.2 version I have updated to include 4mm Shortened arms and waterfall removed as these were successfully used at the 2019 worlds and the +3 chassis which is a new option - this not only lengthens the wheelbase but allows a little more battery position adjustment).
These measurements were taken using a GForce corner weight system for correlation and I then created an Excel model to allow different combinations of parts to be evaluated.
Weight bias change x tuning part.
Weight bias range X configuration.
My B6_2D in layback / shocks rear/ +3 chassis / -4mm arm configuration.
Rear arms in -4mm wheelbase configuration
Rear arms dremelled 4mm
Tuning parts for the B6 range. D block, C block, ESC plate, Servo plate, Frt Bulkhead.
Standup transmission configuration (B6_1D shown)