Radical SR8 issue

[emil.nestor]

Hi @here

I have an issue with my Radical SR8 and I am not sure what is main cause, wonder if anyone can help. So:
- I am running the car in hill climb races in Romania
- I am using Avon A15 radial tyres, front camber -2.5, front toe out 4mm overall
- ride heights 5.5cm front/6.5cm rear
- using soft springs, Intrax 3 ways dampers set in the middle
- car has an unorthodx rollbar for head protection (instead of regular side bars)

I am attaching a picture of the car:



The main issues (which must be related) are:
1. The car tends to lift nose on high speed, the steering becomes light
2. I don't have the feeling I had with other aero cars that the car is "sticking" to the ground faster you go
3. The car exhibit noticeable bump/roll steer

My question is: does this sound more like an aero problem or a suspension problem? Can it be the rollcage mess the aero setup?

[emil.nestor]

hi, the rollbar is made by a Radical distributor in USA as per Pikes Peak requirements.

re front spliter angle - it is set by factory, I can try play with it, what height/angle you reckon would be better?

[emil.nestor]

Sorry, to reply to previous questions:
- bump steer is clearly there, when passing over bumps on the track the steering wheel tends to move left/right, especially during cornering
- toe might be considered big on front, we got to this value after we switch from standard Dunlops to Avon, the steering seemed a bit "loose" so we increased the toe
- the rear wing is standard model and it is set in the middle
- the car suspension is "on the soft side" due to the bumpy nature of the tracks (hill climb)

I will try to experiment with rear wing, I am considering to harden the front of the car as well while keeping rear taller and softer.