And now some exciting stuff
I made the trip to the race in Pardubice. Before race day we did a practice session at Kartplanet with @davidpilny and on esk8s I am right now 3rd in the rankings. Only David and @TZDKB ahead of me.
At the beginning of the session I kept getting wobbles above 45 km/h while braking on a bumpy section in the back straight. Welp, running the trucks at more articulation than intended and a lot of preload has caused this:
The flat washer became a cone washer hahaha. And so much so that I basically lost all preload on the bushing.
I quickly took some extra flat washers, added them between the bent washer and the bushing, and now the board is dead stable. Certainly stable enough for setting my PB for Kartplanet!
Actually during the last two T-race sessions I felt something was a bit wobbly when braking hard from 50. Thought it’s just me not being used to 4wd braking. Damn. I was riding like this 65 km/h or 40 mph on roads and didn’t even notice that something was off, because unless I am braking hard it’s just stable. Even without any preload it turns out! And when I was feeling the wobbles it wasn’t violent wobbles. It was tameable with for sure.
However, now that the truck is operating like it should, and after I went up in truck angle, now running 35/12.5d, I feel like the trucks are setup too tight for my liking. So I need to get back to my stack of bushings and play around a little bit.
My first change will be changing one of the front bushings to 93A, and running less preload on the rear. Will see how that feels
Then a small night ride
Then came raceday at Pardubice.
I was putting good pressure on David in the beginning, after 3 heats we reversed direction and I had a small crash, so took it a bit easier afterwards.
The 9x3.5s were really good on this track. Finally the first time where I saw them forming the stress lines from the side loads!
And about 1.5G peak measured!!!
Also I feel like I want more power at high speeds when the limit becomes battery current. After like 3.95V steady state the voltage sag starts feeling like it takes away power. By 3.8V steady state the board feels significantly weaker.
But it’s still very respectable acceleration of course.
Also want more battery current for braking… But will play with throttle curve first. Currently running 180A for that in total with 580A motor amps for braking…
I am at the point where I would benefit from P45B for sure.
Also David’s V5 on the mamba XLX was less powerful for sure.
And second place podium pics!
And tomorrow there’s a short Kartplanet session again with David before I drive back to Denmark. @TZDKB I’ll try hard to get a better time than yours