Engine Upgrades for 99 XJ
12-07-2010, 10:43 AM
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Year: 1999
Model: Cherokee
Engine: 4.0
Engine Upgrades for 99 XJ
I own a 99 XJ looking to get some more horsepower out of my 4.0 what are some things that are reliable and efficient.
12-07-2010, 10:54 AM
#2
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Here's a couple that are easy:
63mm bored tb
784 injectors
snorkel (it's a true CAI)
gibson headers and a 2.5" exhaust with a flowmaster exhaust
resetting the ECU after each/any combo of these are done.
63mm bored tb
784 injectors
snorkel (it's a true CAI)
gibson headers and a 2.5" exhaust with a flowmaster exhaust
resetting the ECU after each/any combo of these are done.
12-07-2010, 11:38 AM
#5
☠ CF Sheriff ☠
hardware mods only.
larger throttle body
free flowing exhaust
cold air intake
injector upgrade to 4 hole (better atomization / throttle response)
on the more severe end:
stroking the engine:
camshaft changes
bored pistons
etc etc
however i would start with a very thorough tune-up:
plugs, wires, distributor cap, fuel filter, air filter, fluid changes, injector cleaning, seafoam application, etc....you'd be surprised how much hidden horsepower and throttle response you will uncover.
larger throttle body
free flowing exhaust
cold air intake
injector upgrade to 4 hole (better atomization / throttle response)
on the more severe end:
stroking the engine:
camshaft changes
bored pistons
etc etc
however i would start with a very thorough tune-up:
plugs, wires, distributor cap, fuel filter, air filter, fluid changes, injector cleaning, seafoam application, etc....you'd be surprised how much hidden horsepower and throttle response you will uncover.
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