Cheaper, more power, same available powerband, better fuel economy....

How would a supercharger be better? Please tell me.

Maybe you just plain don't like turbos. And thats fine. Its personal preference. But at face value, if anyone wants to boost a Jeep 4.0, the turbo is by far the BETTER choice. Its just not your only choice. And this isn't opinion, no matter how you spin your words.

As for the "low redline" of your Jeep, maybe you should talk to the guys with cummins turbo diesels who redline at about 4k rpm, much much lower than the "low redline" of your Jeep. And none of those guys run big tires, do they? Oh...wait....

All this "build up" of power you are speaking of is non-existant. You can chose a turbo that'll be at full boost at about 1200 rpm in your Jeep. I dunno about you, but thats about 400 rpm off idle. I dunno how you wheel, but if you only use 400rpm in your Jeep, you are amazing and probably have no need for any power adders to begin with.

 

I fail to see how you can achieve enough exhaust flow to build full turbo boost at 1200rpm...even if it is only a few psi. And regardless of the boost points, there is still spool up time with a turbo before it even begins to turn the compressor. Turbos do not work at low rpms, period. If you were to add one for wheeling, which is usually done at low rpm, a supercharger would give much bigger gains in the powerband you desire, and power is instantaneous - which is what you would want for powering over obstacles.

And you CANNOT compare a diesel to a petrol for turbos. The turbo on a diesel is there to help power output at higher rpms - something diesels lack - it has little to no effect on low rpm range torque.

 

I hit full boost (32-33psi depending on ambient) from a Mitsu 16G by 2200rpm, and that was with a 2.0 motor. Play around with the hot side, take into consideration the Jeep motor is twice the size of a Mitsu 2.0 with near identical compression, you will, quite literally, have insta-boost.

Like already stated, its all in how you set up your setup.

I'm not quite sure what you are getting at with your diesel information.

Yes, I do understand that petrol and diesel are two different fuels and work on very different levels. However, my point here was that those trucks don't run higher than 3000-3500 rpm. They reach full spool much quicker than even 1000rpms, because they chose the correct turbo for their needs. Turbos don't come in just one size, there are so many things you can change to suit your application.

On that note a turbo can be more versatile in that sense. You can chance more than just pulleys and gears to get what you need from your turbo.