Hello:
I have a 1998 Jeep TJ SE that I imported to California from Canada. While in Canada I installed a 2.5" BDS lift and put 33"x9.5" BFG MTs on the stock wheels and it was great in the snow, but the tires are pretty useless here.
I've recently started towing my 5x8 motorcycle trailer (for a roadracing bike) back and forth a lot. With the small 2.5L inline4 motor and big tires, I'm starting to wish I had a little more HP on tap.
When these tires wear out, I'm going to 31-inchers for the lower weight and better match to the stock 4.10 gearing, but that's probably not for another year or two.
Between now and then, what are the best HP/$$ mods I can do on the Jeep engine? I want something safe, cheap, and simple. I'm not looking to make my 128000km engine blow prematurely, I don't want to run higher octane fuels, and I don't want to spend too much time or $$ installing a blower or anything like that.
The engine is completely stock. Stock filter, stock throttle body, etc. I can't remove the catalytic converter because I'm in California and need to smog the damn thing.
Got any suggestions? Has anyone done dyno testing to show what mods made the most amount of improvement? Thanks for all your help.