Now working on baseline setup so that ipk can provide to customers buying.
As you can see kart is getting pretty stable and needs minimal steering movement
Well they do have a baseline setup… its from 2017 and has worked untill now, with the new chassis is changed and needs a new baseline to be performing good out of the box!
Had the final round of the Oregon State Karting Championship Series a few weekends ago. I finally realized today that I never made them public on Youtube…oops.
Overall, I had another fun race day! My head gasket held the whole day and the engine felt strong. I also had new tires which were definitely overdue. Prior to the race day, I set my front end up with full caster. I was talking to a few people about my kart and how I’ve been having some handling issues. They recommended trying full caster as they have seen some OTK chassis need a bit of “help” jacking weight once they get a few years old (mine is a 2019 Kosmic).
Man did that make a huge difference! The heavy braking / slow 90 degree turn one felt so much better I couldnt believe it. The kart felt like an entirely different chassis! From turn in through the apex, I felt like the kart was actually properly jacking and I didnt struggle with oversteer at all in that corner. However, I did notice that the higher speed corners felt a bit “off” after the change. My turn in points were all way later with full caster than what I was use to so I had to almost relearn the rhythm necessary to drive the back esses cleanly. At first, I kept turning in too early, having to open up, then turn in again. Eventually it started to click but it was an adjustment.
I do think that the full caster adjustment compromised the high speed corners a bit even though it completely revolutionized my ability to carry momentum through the slow corners. So, perhaps there is some additional tuning I need to explore. With full caster, I may not need the front as wide or maybe a bit of positive camber would help? I’ll play around with it.
Here is the final race video (I have all the sessions up on my Channel):
6:20 was is a particularly good lap!
The race was so good. Starting P4, I had a good opening part of the race. I retained my position on the start and was able to stay pretty close to the lead group as they were battling. Once the lead group settled down, I couldnt keep pace with them and I fell back a bit. The second half of the race was a tough battle between myself and kart 7x. We were both faster than each other in different sectors but had overall lap times which were fairly similar. I managed to get back past him towards the end but he squeezed through on the back esses on the second to last lap. I didnt have enough time to get back up on him and finished P5. Despite that, it was such an enjoyable race. I was locked into the “flow state” from start to finish!
Finally, I think I cleaned up my line a bit through the esses and t1 based on feedback I received here last time. For t1 I was reminding myself of “slow in, fast out” and that “carrying momentum” is more about carrying speed from apex to exit rather than entry to apex. I felt like I was consistent and faster through T1 all day. For the esses, I got feedback that I was entering them from too far inside the track and over cooking the first left hander. I kept a wider entry all day but never felt 100% satisfied with the esses sequence. While I was behind 7x in the final, it was clear I was loosing most of the time through that sector. It just felt like I had to lift in order to not loose the rear end but I was having to lift more than 7x. That is why I want to continue playing around with the front end adjustments in this layout.
If it’s any help, my virtual tuning (IIRC) would suggest that high caster makes the kart skatier, more tippy, and affects top speed.
I would very much run high caster on tight technical tracks. On a long fast track like amp, not. Again not sure if I recollect properly but high caster reduces top speed, I think
Yeah I could tell it helped a ton with the one or two slow corners in this layout but didnt feel as good in the high speed corners. I may try out a neutral pills so I can set it somewhere between neutral and full caster.
Not sure I know what you mean about “skatier”. I would think that would be more “free” and less grip? I don’t think that was what I was feeling. It helps the kart jack weight which normally means more force on the outside rear wheel and drives the inside front down into the track harder. I do agree that because the inside front is forced down more, a braking effect begins to occur.
Thinking through it, I wonder if through the high speed corners, the kart would lift the inside rear but then due to the full caster’s effect, would also set it down too quickly which was causing my perceived grip issues?
As a new guy, it was nice to make a significant change, feel what that felt like, experience its impact, etc. Then, I can use that to help inform backing that setting off a touch to find a happy medium?
For reference, I had the kart setup with 15mm spacers up front and full width in the rear. So it wasnt set to what I would think would be “maxiumum jacking” (e.g., narrower rear, full width up front).
I should banish “skatier” from my repertoire.
I associate it differently as a former board sports guy.
(Think carving on a penny board, as opposed to hill bombing on a longboard. Slalom versus super g.)
I mean it as you describe it. Quick weight transfer, high grip. Less good fast corner.
That sounds plausible. Makes sense.
I can’t really help with the specific stuff since I only mess around in game with setup. The rules are the same but there’s a lot more subtlety in the irl stuff.
Unmothballed the kartpulse instagram today and found this video I made from the supermats one year. I think it was 2017.
Shot on an iPhone six so the actual image quality isn’t great, but I’m kinda proud of it honestly. It shows the speed of karts which is kinda lacking from content IMO. At the time slowmo stuff was in trend (which was cool too) but in true contrarian fashion I have to go left when everyone else goes right.
@XanderClements we gotta get that static cam setup at the fastest part of the track for your shows.