Question Need different frame rates

I need to do an AR simulation. I need to clock the scene at about 270 fps, to calculate the IMU and gyro signals I am synthesizing. But I only want to RENDER at 60hz. I need the 270fps physics calculations for the sensors above, but I don't need to render that frequently. How could I approach this?

 

Thanks! BUT - I need BOTH of them to be "fixed". I need the app to not run in real time, I need every frame rendered, no matter how long it takes. But I need the IMU timestemp to be 270HZ and the fixed render rate to be 60HZ. Can that be done?

 

I get it that fixed update is for physics and can be a higher frame rate, say 270. What I don't understand is that setting targetFrameRate will set the time between "Updates" to be a TARGET of the frame rate given, but they won't be exact. I need the time between Updates() to be exactly the same, and at a lower rate than FixedUpdate(). Can I do this?

 

I think what I needed to do is this:
Time.fixedDeltaTime = 1.0f / ImuFrameRate;
Time.captureDeltaTime = 1.0f / VideoFrameRate;

this seems to work, and in non-realtime. It seems to be working nicely!