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your problem may be stemming from your FMIC...there are a few reasons behind this...
1) if you have a chuki bumper on your car...that will cause a HUGE problem with proper air flow...the chuki bumpers front air dam is VERY limiting...when you put a FMIC behind your chuki bumper...80% of the air is being taken in and filtered thru that FMIC...very little is actually reaching your radiator
2) if you still have your AC stuff in place...especially the condensor on a chuki bumper...it will limit your air flow to the radiator
3) the RPMs youre traveling at at the speeds listed...the clutch fans ineffective range is between 2500-3200 rpms...2500-3200 rpms is basic crusing RPMs in 4th and 5th gear...especially on the freeway...the stock electric fan on the 91-94 models was put in place by nissan to remedy this problem...so if you have removed this...you may want to put it back and wire it up to a switch
what you may want to consider to remedy your issue is...
1) invest in a koyo 55mm aluminum radiator...the S13 radiator flat out sucks once u start upgrading your turbo system...its fine if youre running a sidemount intercooler or a stock KA
2) invest in a 180sx kouki front bumper (this will make a HUGE difference...my NOT dropped 20-40 degrees during the day in summertime here in vegas...and thats HUGE)...or run a zenki bumper...the air dam on the zenki bumpers sits DIRECTLY on the FMIC...it allows alot more air to flow to the FMIC as well as behind it
3) run the highest octane you can in your motor (yes this does make a difference...and you should be running NOTHING LESS than 91 in your SR)...the slower and cooler burn DOES effect your NOT (normal operating temperatures)
4) your SRs thermostat is going bad...this will cause a problem with the coolant staying in your radiator for its correct amount of time for proper cooling...without it youre just going to cycle hot coolant thru the motor without proper cool down times
there are a few other minor things you can do as well like invest in a bolt on air dam that goes on the top of your radiator support between the support and bumper...also...replace your coolant temp sensor on your motor...as SRs get older...there are more things you need to update on them to keep them in good running shape
all of my suggestions are VERY valid given i live in vegas and heat is the #1 problem with ALL cars here in town (120-130 deg in direct sunlight here and even hotter temps coming from the motor and blacktop tar on our streets here)...ive spent alot of time messing with my cooling system and the above are the best problem solvers i can offer you
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