Well I ran the EVO on Sunday with rubber tires on our brand new concrete track
Took out a win in the first ever race on the new track so I was pretty happy, but we ultimately got rained out.
I made a few changes to the car to prep it for rubber tire racing and it seemed to work very well.
I swapped the rear end hubs back to the older V1R style hubs with the short 26mm axles. I did this so I could lengthen the rear pivot balls 2mm so that the rear camber change is lessened.
I used the same springs as stock and 30 wt shock oil all around. Also I removed both front and rear stabilisers as the track is quite bumpy and I felt the car would be unstable with them on.
I also ran a front diff with 30K wt oil and a rear diff with the TCD gearset and just the grease.
Apart from those things I left the car more or less stock geometry. However to counteract the increased rotating mass of the rubber tires (they are at least 66% heavier than foams) I installed a 5 star lightened clutchbell, 3 racing lightened and smaller (33mm) flywheel and removed the press plate from the centax clutch so that the flyweights work directly onto the clutch shoe. I also used the red clutch shoe to take some shock out of the clutch engagement and used the lighter original V1RR clutch spring set at 2mm on the adjuster nut with .5mm of end play.
For the body I ran a Lola body with the floating rear end mount and lola front body mounts. It was dubbed the "Red Bulldozer" by the race announcer following a lapping incident. Don't worry I redressed it
I was running a MT12 motor as well which was mostly stock, but I went to a #5 NR plug since the track is quite short.
So all around the EVO seems to work quite nicely on rubber tires, a bit more tuning required tho. I want to work on the gearing (it was lazy out of the corners) and also need to come to a decision on tires.
I was running the new tires out of Korea (I think) called ING. I was using the 27s which had great grip, but I was torching the rears. They came off the track at 65 degress with an ambient temp of 30 and a track temp of 40. I went to hotter tires but they were terrible (I think it was insert related).
And a note for the "shaft drive fans" out there. I was sitting mid pack on the grid and when the tone went I took the holeshot around a NTC3 so savagely that he muttered an expletive or two. Then proceeded to hammer him out of most corners on the track
He flamed out mid race so I did not get much more data than that.............