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Hey all. I did some research on how the back axle on a go kart works and i would like to share it with you. In KRP there are seven different options to choose from and i'll make a try to explain the differences on them in the following sentences. First of all we must know that 'rigidity' is the key word behind the axles and this is the basic parameter of the axles. If an axle has high volumes of rigidity or in other words "moment of inertia" that makes this axle stiffer. This condition refers to a more stable back (more rear grip). You can say that the harder the axle (high rigidity) the kart tend to understeer. And vice versa the softer the rear axle the more oversteer. I don't want to say a lot so i will make a summary from 2 different sources from which i have put in perspective 4 different parameters, including outside diameter, wall thickness, rigidity and weight) of the different axles :
* before you continue note that the numbers below are for comparison purposes mainly and they may be differ from real life.
(rigidity min. 86 max 789)
axle diameter/ rigidity (hardness)/ weight
50 soft = 348 rigidity (2,38kg)
50 medium = 435 rigidity (3,28kg)
50 hard = 740 rigidity (4,57kg)
40 soft = 240 rigidity (1,89kg)
40 medium = 300 rigidity (2,75kg)
40 hard = 511 rigidity (3,57kg)
30 hard = 271 rigidity (3,00kg)
--
Remember that rigidity means hardness and hardness means more grip (understeer) so you can deside what axle to use in any case. For example, if you are currently using the 50mm hard axle and you feel that the kart has generall understeer your second choise must be 40mm hard. Going from 740 rigidity to 511 will propably fix your problem, if not then you may try the next option (50mm medium) with 435 rigidity. Note that the weight is an important parameter here - i dont know if KRP took it into account but in real life plays a huge role in seeking the 0.1 sec of your lap times. In generall, if 2 axles have about the same rigidity then the axle with the bigger diameter weight less. Just look above and compare the 30 hard with the 40 medium axle. The 40 M weights just 0,25kg less even though it has greater rigidity than the 30mm hard. So, your final axle choise will help you to fine tune your chassis and drop more your lap times. Hope this helps
Oversteer --> 40 soft --> 30 hard --> 40 medium --> 50 soft --> 50 medium --> 40 hard --> 50 hard --> Understeer
* before you continue note that the numbers below are for comparison purposes mainly and they may be differ from real life.
(rigidity min. 86 max 789)
axle diameter/ rigidity (hardness)/ weight
50 soft = 348 rigidity (2,38kg)
50 medium = 435 rigidity (3,28kg)
50 hard = 740 rigidity (4,57kg)
40 soft = 240 rigidity (1,89kg)
40 medium = 300 rigidity (2,75kg)
40 hard = 511 rigidity (3,57kg)
30 hard = 271 rigidity (3,00kg)
--
Remember that rigidity means hardness and hardness means more grip (understeer) so you can deside what axle to use in any case. For example, if you are currently using the 50mm hard axle and you feel that the kart has generall understeer your second choise must be 40mm hard. Going from 740 rigidity to 511 will propably fix your problem, if not then you may try the next option (50mm medium) with 435 rigidity. Note that the weight is an important parameter here - i dont know if KRP took it into account but in real life plays a huge role in seeking the 0.1 sec of your lap times. In generall, if 2 axles have about the same rigidity then the axle with the bigger diameter weight less. Just look above and compare the 30 hard with the 40 medium axle. The 40 M weights just 0,25kg less even though it has greater rigidity than the 30mm hard. So, your final axle choise will help you to fine tune your chassis and drop more your lap times. Hope this helps
Oversteer --> 40 soft --> 30 hard --> 40 medium --> 50 soft --> 50 medium --> 40 hard --> 50 hard --> Understeer