Ive got a 1991 wrangler sahara edition and imfixn it up. im about to be turning 16 and i know a jeep isnt any kind of dragracin car but, but i need it to go a littl faster than 70 mph. can anyone help me. how can i make it a littl bit faster.
Ryan14, although it would be awesome to be able to outrun you friends, why dont you outcool them. Jeeps are the coolest vehicles around. Everybody loves them, whether they are slow or fast, big or small. So go slow, enjoy life, and pick up all the hot chics that they leave behind. Plus it is safer.
92 YJ 4.0L, 35" Goodyear MTR's, Rough Country Suspension
Come on, folks. An I-6 YJ should be able to hold a straight and level 70-75 on the highway without breaking a sweat. Heck, my YJ will hold 85 no problem (if I'm feeling particularly suicidal... ), even with 4.56's, 33" tires and 6" of lift. Seriously, there's something going on if you can't hold 70 on a level road, even with a lift and oversize tires.
Some things to consider:
Ignition - worn plugs, aged wires, coil, dirty valves, carbon buildup in the combustion chamber
Intake - dirty air filter, !Restrictor mod not done, dirty throttle body
Guess how many of the above I had to address when I first got my YJ... Answer: all of them (except the ones listed for "Mechanical"). There's definitely some power hiding in your engine, you just need to find what's locking it up and unlock it.
Originally posted by AJ: nightclaw, what's your mileage on the highway? I'm setting up the same combo, w/a 4"lift.
Good question. I need to figure this out one of these days... Off the cuff, I'm getting around 14 MPG on the highway, going between 70-75MPH. I base this on the 8½ gallons I took on after driving 120 miles on my way to Superstition IV last weekend, with lots of up- and down-hill grades and head/cross-winds between my house and the Golden Acorn casino where I got gas. Not exactly scientific...
A better carb and a TFI igniton should start u off.But my Jeep has no lift but has 31/10 and I went 80 mph but want be doing that again.I myself am some what a speed demon and my driving record would back it up.I would not drive a jeep 80 mph unless I was running from 2 big guys wanting to make me there *****.But if you are inclined to run that fast these will get u there.But there are other mod problems to go through like bypassing the cpu that controls the carb and timming.They have a problem with missing with your mods.I will send you the web site for that.later,Gary
Gary 87 Wrangler 4.2 258 with weber carb and TFI upgrade.
31/10.5 and Nutter bypass!
You should definately be able to hold AT LEAST 75 on level ground highway.. i can get my 2.5L 4Cyl up to about 98-100MPH downhill, and even uphill on a highway picking up some wind it will hold about 80MPH with it floored. It might be needing a major tune up.. plugs, filters, exhaust, etc. Try shifting at around 3500-4000RPMs when merging on if you dont already, i used to shift around 2500 cause my engine would be pretty loud, but thats just cause it's a 4 cyl. But dont go too fast.. they're not meant for speed. If you hit a bump to fast you can loose it. Good luck!
95 YJ, 31 x 12.5 ProComp ATs / AR767 wheels, stock 4.10s, 2 1/2" Rough Country Suspension Lift, and huge rusty basketball sized drain holes.
the 91 was the first year with the EFI kit on the I6. The 4 banger YJs were always TBI. Unless he has faulty registration, or a swap, he has EFI.
Ryan14: Jp magazine has a great article this month about performance upgrades for EFI 6 cylinder jeep motors. But I have the 4.2 carb version, so I have probably 40 hp or less than you, and I could hit 75 on the highway before i upgraded anything.