My goal is 250hp ~ 260hp for now, maybe if I have enough money saved up I will get an L&P plenum (if they still make it) to hit that 270hp mark. fmu's are band aids for guy's with poorly tuned honda's and mustangs. then maybe an fmu would do much more but then you run into the injectors being to small again. what are your power goals for this car? if it's going to be anywhere near or over 300hp you will at the very least need an upgraded fuel pump. power gains from those few mods have been shown to minimal at most, still things most people already have because of how simple and cheap they are to do so i didn't bother to mention the first time around. a few minor things i left out are electric fans, intake with a k&n filter, and a 240sx throttle body. when i made the 275hp pull the car was back to a 1:1 ratio regulator. that is one reason i went back to the standard 1:1 ratio like the factory. most factory fuel pumps will start to bleed off pressure around 80-85 psi, i'm not really sure where the factory z31 pump does this. the more adjustment i gave it for more fuel under boost the more the car really didn't like it, at the time i still had the factory fuel pump. now the one thing i totally forgot about was the fact that i had a cartech fmu on the car when i dyno'd 259. my car dyno'd 259hp before the gutted plenum. Which I am not sure if any company makes that.ΔΆ50-260hp is very accurate. With a stock base pressure of 37psi and assuming a linear fuel pressure increase will be safe, a 2:1 FMU will be perfect. So to safely run at 15psi~16psi of boost on stock turbo I need 66psi of fuel pressure. I don't have a gutted plenum, so I guess 250hp ~ 260hp is about as far as I can stretch (I don't know if my e-fan and UR pulley help any).
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December 2022
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