4.0 performance mods

[Head Lice]

This doesn't pertain to a 93 Octane tune. Or the fact that a 93 octane tune will make more power than an 87 Octane tune.

But yeah I see how that certainly applies with 110 octane.

Not quite understanding your 93 octane tune . . . . this with the stock compression ratio ?

 

[Jerry Bransford]

Not quite understanding your 93 octane tune . . . . this with the stock compression ratio ?

Exactly.

 

[GregAusTex]

so can anyone recommend a turbo kit for a 98 tj 4.0? out of curiousity i looked online and only see ebay turbo kits

I found this, sure there are more.

http://www.fourwheeler.com/how-to/1308-banks-4-0l-sidewinder-turbo-system/

Have yet to see a vehicle where Cold Air Intake or exhaust mods etc. really make a difference beyond sound and maybe throttle response. All that would require that the manufacturer could have easily delivered more power but didn't bother. Forced Air induction however transforms. Just don't forget about how that extra power effects the drivetrain, and for the love of all that is holy get the fueling right.

 

[Chris]

Well, I don't know what head 2JZ runs, but there's this:

https://wranglertjforum.com/threads/4-0-edelbrock-performance-cylinder-head.7806/

I've always been interested in this, but have yet to see anyone running it or read any real world reviews. I would be interested if there was enough good feedback though!

 

[Bigk]

There are some very knowledgable people on this forum, Jerry Bransford, Mr Blaine, and several others. What I have learned, both here and elsewhere from having my LJ since 2005 (new) as well as a '83 CJ5 since new, is that the in-line 6 is a very durable motor and does not modify easily for increased performance. You put an exhaust on it (custom or out of the box) and all you will get is an increase in sound, the performance gains will be negligible at best and most assuredly $ per HP will be disappointing, same goes for the "cold air intake" stuff, as well as the "throttle body spacer" and the "tornado" stuff. In reality, the only thing I have seen that dramatically increases HP and torque is to either stroke it (making it somewhere around a 4.6 liter) or put a super charger or turbo charger on it. None of these three are inexpensive, but all three give significant boosts in HP and torque. My suggestion is to save your money for one of those or increase the capabilities through suspension, lockers, winch, etc. It is, after all, a JEEP, not a hot rod....... YMMV, just MHO

I like your thinking