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SGT Mack is probably spot on but one other thing to check would be valve cover bolts or gasket. With such high miles the internal seals are starting to go would be my first bet though.

QWKJEEP is hitting the 100 shot after third gear only and he's still pulling in those timeslip numbers. Very good 60 ft times.

The AW-4 in the XJ has a set stall speed of 2100rpm...other than firmer shifting there is nothing additional to really add to it to make it perform better. BTW, the "zip tie" shift mod will not work on the newer intake manifolds (99-up) as it causes the throttle cable to scrape against it at WOT.

Ditto. Agree wholeheartedly.

Dino, Off topic, found this article about CAI and thier dyno results. Quite interesting http://mustang50magazine.com/techarticles/m5lp_0601w_cold_air_intake/ Looks like then new GT's are underated from the factory according to these dyno results?

Ghetto, it is strange you have no CEL illum. I suspect ignition/electrical still, primarily battery.

Dr Dino: I recall you discussing the IAT mod some time ago and the issue of ambient temperature had come up. IIRC, you stated that temps up 50F or lower you should install the IAT back to it's original factory location since it might actually lower gas mileage in addition to having little...

You know I just noticed the redline for the Typhoon-4800rpm! :rtm: :variety:

Ghetto, some possible questions and culprits: 1) your command/remote start could be interfering with your ignition system (any way you can disengage it or shut it down completely?) 2) Do you have any smoke coming out the tail pipe @ start up? 3) What was/is fuel level when you noticed this? 4)...

Jeeps are'nt race cars but for a daily driver you dont need to be...superfast as mainstream car enthusiasts tout. What you need is solid torque "off the line" and then the hp to keep it going. The XJ provides this copiously, stock form or modified. They used to say the Cherokee was the king of...

Touche! No intention or mention of direct fuel injection was made by self, Jedi Master.

CC stands for "combustion chamber", this is the chamber right below where you put your spark plugs (can see it through the spark plug hole) into and where the fuel injectors spray atomized fuel into. This chamber can typically become fouled with carbon and using a good fuel system cleaner like...

My 01' consistenty gets 20-22 mpg (50/50 city-highway). Highest I ever got with it was 24.5 highway. +400 miles per tank easy. I use either Shell or Amoco/BP almost exclusively. It is modded quite a bit. In addition, I've got Redline synthetic in all service points for the XJ. Keep it tuned...

Excellent. I love my fastman-62 and fipk as well.

You are looking at 10lbs of more rubber, minimum. 255 "and over" will add up to 20lbs per tire depending on tread pattern etc.

Also consider that the sizes of tires you are discussing will add considerable weight, example: 235 from 255 or higher could add up to 20+ lbs per tire, not including the wheel. If you are looking for a street XJ, I would at least keep this in mind as it will affect your off the line performance...

Redline's Water Wetter

I would'nt worry about the two precats, they cause trivial restriction. I have a Banks header and would recommend it very highly. No fabrication to install, it is a direct fit. to your precats and downpipe. Speaking of the downpipe, DO NOT get rid of that. It's perfect at 2.5"

JS, I'm sure he was kidding around....