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4.0 Performance

Old 01-09-2019, 09:28 AM
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What are some easy way to get more power out these 4.0 motors? Im looking at a cam kit and a head, im not used to working on anything with less than 8cyl so im riding the struggle bus, any help would be greatly appreciated! Trying to stay within a budget as well but we all know how that goes!
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Old 01-09-2019, 09:37 AM
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depending on the year upgrading to the newer style intake helps a little, also 4 or 12 hole injectors are a good upgrade both go well with a bored out throttle body and k&n air filter
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Old 01-09-2019, 09:40 AM
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I ordered a Banks CAI already, what mm throttlebody would you reccomend with the bigger injectors? Also what kind of exhaust? Might as well put a header on it while everything is apart.
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Old 01-09-2019, 09:40 AM
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Originally Posted by tinytrax78 View Post
depending on the year upgrading to the newer style intake helps a little, also 4 or 12 hole injectors are a good upgrade both go well with a bored out throttle body and k&n air filter
it is a 96 btw
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Old 01-09-2019, 10:12 AM
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Originally Posted by tinytrax78 View Post
depending on the year upgrading to the newer style intake helps a little, also 4 or 12 hole injectors are a good upgrade both go well with a bored out throttle body and k&n air filter
Can you define Newer Style Intake? What years this refers to.
I've got a 93 that is going to be going through some changes and depending on how far I tear it down I would like to do some upgrades as well. I already have to do an exhaust manifold so I might as well consider intake since I'm already removing it.
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Old 01-09-2019, 10:40 AM
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99-01 had a bigger plenum if i remember correctly, i found one already ported and polished, just waiting on payday for that toy money to deposit! Also going to pull the trigger on a polished 62mm throttle body and injectors, i didnt realize how cheap these motors were to build!
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Old 01-09-2019, 10:41 AM
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The most money i have spent was for the CAI and the intake, injectors, and throttle body together is only $15 more than it was...
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Old 01-10-2019, 11:18 AM
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I'd steer clear of the K&N filters unless this is a strictly street driven Jeep. They suck at filtering contrary to what their marketing says. K&N is more of a good marketing company than a good filtering company. YOu can dump a lot of money into the 4.0L and not get very much power with bolt ons. If you are looking for real power gains you have two real options. Stroker motor or forced induction.
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Old 01-10-2019, 11:26 AM
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XJwonder on here sells bored TBs and ungraded battery cables (both I would recommend). You state you are on a budget, but didn't say what the budget was. I have a 4.0 I put a cam in, bigger injectors, bored TB, 99+ intake, bored .030 over. If you really want power stroker is the way to go.
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Old 01-10-2019, 11:32 AM
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My 62mm bored throttle body would do wonders on your engine.

I agree with the battery cables statement as well.
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Old 01-11-2019, 12:33 AM
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I am only looking to dump around 3500 into the full build, lift, wheels, tires, and rhino lining im into it for 2450 lol
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Old 01-11-2019, 08:58 AM
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So if one were going to replace the intake manifold what is a good price for the 99-01 version?
XJwonders, what do you charge for the throttle body?
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Old 01-11-2019, 09:03 AM
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Originally Posted by Scott91370
So if one were going to replace the intake manifold what is a good price for the 99-01 version?
XJwonders, what do you charge for the throttle body?
Sent ya a pm
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Old 01-11-2019, 09:47 AM
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Originally Posted by Scott91370
So if one were going to replace the intake manifold what is a good price for the 99-01 version?
XJwonders, what do you charge for the throttle body?
I pulled mine from the junkyard, but depending on what year jeep you are swapping a 99+ head onto it can be just a swap or changing pulleys and power steering pump and such.
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