Bigger Injectors

Ben did pass the time by typing:

Sure, they will dump more fuel in. What is your engine going to do with it though? Ans: It's going to shorten the injector pulse to put the mix back to where it is supposed to be. Which if your not careful is rich at idle. That will cause excess carbon buildup and kill the cat.

The only reason for larger injectors is if you plan to force more air into the engine with either a supercharger or a turbocharger and do not want to increase fuel pump pressure or throw in a larger pressure regulator.

A good first step would be to bore out your TB and install a cat-back exhaust.

As Doug says, you need air to go with that fuel. OK if you have a turbo or supercharger, but otherwise worthless. A larger T/Body is useless unless you plan on driving with the "pedal to the metal" all the time. At anything other than wide open throttle, you won't gain a bit.

Thanks for the info.. Looks like I am stuck with the 4banger for awhile... Start saving up for a 4.0L or maybe just drop in a V8... Come on lottery!!! LOL

Ben

Maybe it's the combo of things -- I don't know -- but I disagree. Of course I don't have a dyno to prove any of it. A number of forums/groups/sites I visited said that swapping out the 4.0l TB was the best mod. Adding the intake and exhaust make more sense (bigger TB can't pull in more air if the air is already at full volume and what's it going to do with all that air/fuel if the exhaust is still super-restrictive). Yes, I know the first restriction is at the cat...

My intake (Airaid), 4.0L TB, and dynomax cat-back allow me to run on the highway a lot better than stock drivetrain TJs with 33s. I still use 5th quite a bit (not on long uphill grades).

Eric

And then get an inertia ring, electric fan, MSD ignition, TB spacer, and a K&N. Add up all those HP increase claims and you will have that 2.5L putting out like an eight cylinder!

No! No! No! Like a dog chasing a car, what will it do with after it catches it? Also, like putting a 1 inch drain under a 10 inch fawcet, pretty soon you are all wet.

HarryS

Oh yes... Thanks! Now we are up to big block status!

JimG

JimG did pass the time by typing:

(first, put down the coffee and move the cat)