Yesterday finally I managed to run my 977e for the first time.
I did test the prototype, some time ago, but now I have the kit version, which has a few improvements, over the prototype, (nothing related to performance
For the first time I drove 21 laps in 5.14, which is a record for me, on our track.
After all testing I have done the last year or so with the Tekin stuff I run, I did make a usefull "roll-out chart" for eveybody to use, to give a good starting point for gearing compared to rear tyre diameter.
You can find it on Serpents website in the download section of the 977e.
The sheet works really simple.
If you run the T8 2050kv motor, you want the car geared between 41-42mm, on a nice open 8th scale track.
On smaller tracks, go down 1 or 2 mm.
For this example, lets take 41mm roll-out.
Start with measuring the tire diameter of your rear tires.
Lets take 73mm for example.
Now check under the 73mm tire diameter, which spur/pinion combination gets closest to 41mm, and put that in your car.
In this case you will end up with 49/15.
If you don't really constantly want to exchange the spur (I don't!) just start running your car with new tires of around 77mm, with the gearing 48/14 then, and once the tires wear down to 72mm, gear up the car to 48/15.