well, as this thread's topic is "Max Speed", i would like to just share what my car can do.
i did 160(+)km/h with my iswara sedan, 1.3 M/T, carburetor stock standard (no speed limiter), with add-on front stabilizing bar. on a section of east-west highway straight. tyres, rim and suspension were stock standards. My meter scale ends at 180km/h.
I have already floored the accelerator, but couldn't get it go faster. I really wanted to go faster, but don't know why cannot. The rpm was around 4000 to 5000 rpm. can't remember well. but i know my engine still can rev higher than that, but it just doesn't want to. RPM scale ends at 8k rpm.
The car was pretty stable and no problem to go faster. still easy to handle.
Few months back, I have upgraded my sparks plugs (to bosch super 4) and cables (to 10mm core), but haven't tried out max speed yet, hope to be able to try out whether the upgrades will help in getting higher max speed.
cheers.