When we met (1992) my wife had a '90 240 SX with a 5 speed manual. She really loved that car. The power curve went pretty flat above 5k RPM (probably could have been fixed with a good tune), but it still very fun to drive. I don't know if this has been done before but you could experiment with OEM subframe bushings with the open areas filled with silicone caulk. Seems to me it would make it a little stiffer without going over the top.
Hey that’s awesome! Yeah these KA engines have crappy factory camshafts and cylinder head flow suffers. It literally feels like you’ve hit a brick wall In acceleration. I shift pretty low in the rpm range when “racing” As far as the silicone method. People have been doing that for years with these cars. I have in the past. I already ordered some bushings. Hopefully those show up here in the next couple of days.
