The N011M Bars radar on the MKI is stated by the vendor to detect a 5m2 target at 140 KM
If this figure of 130 KM for 5m2 target for KLJ-7v2 of the JF-17-Block2 is true, then ...
Assuming MKI has an RCS of 10.m2 and JF-17 an RCS of 3m2 clean
In a very generically assumed, over simplified and somewhat empirical terms ...
MKI will detect a JF-17 at a range R = [(3/5)^0.25] * 140 = 123.22 KM
JF-17 Block-2 will detect an MKI at a range R = [(10/5)^0.25] * 130 = 154.57 KM
Hmm ... this is quite questionable as it even exceeds the performance of APG-68v9 for the F-16 Block-52+.
Especially so when the radome aperture/space on JF-17 Block-2 is the same as Block-1 and it is less than that of the Viper. This means a smaller and less powerful radar than the Viper's radar is providing better detection ranges is a quantum leap of Chinese technology over US technology. Lets hold off on this for now.
I will tend to stick with the current figure of 105Km for KLJ-7v1 for Block-1
JF-17 Block-1 will detect an MKI at a range R = [(10/5)^0.25] * 105 = 124.87 KM