lm2917 frequency voltage converter, non linear output?

Excellent article about voltage converter, interested to know which company provides one of the best voltage converter

That'd be me.

Kristian Semiconductor Corp

Our motto is: Sometimes they conduct, often they don't.

I have been using the LM2917 together with a induktive "standard" car sensor with 2 holes.
The post from StudentSA should help you a lot picking possible combinations in my opinion you should go for the
"C1 = 10nF .... R1 = 157232 maybe bit too high" option.
I have myself C1 =10nF, R1=360K (and C2 = 0,1uF), because the generated pulses per turnaround are few and short.
(my C1 is connected to pin 2 and C2 is parallel to R1 for reducing the small ripple, it is inverse to your diagram).
For me it generated a Voltage from 0,4V to 4V for 600U/min to 6000U/min (10-100Hz), I have 12V supply (Vcc).
This matches to the formula Vout = Vcc*f *R1*C1.
I also tried to change the offset to get higher voltage but in my case the output voltage became "stuck" about 6V.
So I decided to keep it in the 5V region and amplifying it externally with a seperate opamp/transistor.

Another thing, the length of the sensor cable hat significant effect, espesially when I was not using the original shielded cable. I recomment to hold tha cable as short as possible and if it becomes longer than 0,5 m use shielded sensor cable