[rkymtn05]

Originally Posted by JeepJake24

What injectors are you running??

I picked up a set of injectors from a totaled 2006 jeep commander with the 3.7l v6 from my local jy. Mopar part #53032701AA (Bosch number ends in 8021) and they have a blue snap on band. You can get them from the dodge 05-08ish SUVs (Durango, nitro, Dakota pickup) that had the 3.7l v6 too.

[LittleBluE]

12v cummins mated to the nv3550 that's what ill be going. Big power and a bullet proof bottom end.

[Hammond_Egger]

Originally Posted by rkymtn05

I picked up a set of injectors from a totaled 2006 jeep commander with the 3.7l v6 from my local jy. Mopar part #53032701AA (Bosch number ends in 8021) and they have a blue snap on band. You can get them from the dodge 05-08ish SUVs (Durango, nitro, Dakota pickup) that had the 3.7l v6 too.

Were they a direct swap? (no need to modify the fuel rail or harness connector)..

[rkymtn05]

Originally Posted by Hammond_Egger

Were they a direct swap? (no need to modify the fuel rail or harness connector)..

No modifications for the 05-06 tj-lj. From what I understand, the 05-06 has a higher fuel pressure and the donor vehicles I listed have the same pressure. The 99-04 has a lower pressure and is better served with injectors from a ~03 Dodge Caravan with the 3.3l v6. Mopar part number 04186454AA, Bosch part number 0280156007 (you can't miss them because they're neon green). The OEM tj-lj injectors are siemens deka brand and have one large hole on the tip of the injector vs the Bosch injectors using four tiny holes. The result is an incredibly better fuel atomization which gives a smoother idle, increased fuel economy and better performance. I've driven my buddy's 04tj (TanTJ04) with the 007 neon green injectors and it's the same benefit as what I got with mine. If you got the time and money, try it out, you won't be disappointed!

[Hammond_Egger]

Originally Posted by rkymtn05

No modifications for the 05-06 tj-lj. From what I understand, the 05-06 has a higher fuel pressure and the donor vehicles I listed have the same pressure. The 99-04 has a lower pressure and is better served with injectors from a ~03 Dodge Caravan with the 3.3l v6. Mopar part number 04186454AA, Bosch part number 0280156007 (you can't miss them because they're neon green). The OEM tj-lj injectors are siemens deka brand and have one large hole on the tip of the injector vs the Bosch injectors using four tiny holes. The result is an incredibly better fuel atomization which gives a smoother idle, increased fuel economy and better performance. I've driven my buddy's 04tj (TanTJ04) with the 007 neon green injectors and it's the same benefit as what I got with mine. If you got the time and money, try it out, you won't be disappointed!

Thanks for the info...next time I am at the junkyard, I will wander over to the Caravan section (since I have an 01 TJ).

[JWebber]

Originally Posted by DeltaBCTJ

Well I dont have the motor, but I can get a front clip for 3k ish around here.



Jwebber, do you know this company your speaking of? any links choices would be a good thing too!

Anyway thanks for the discussion points, makes my day go by a bit quicker.

I think these guys! thier might be other on the net now jumping on the idea.

http://www.hpamotorsport.com/tdijeep.htm

[chris86vw]

[quote=JeepJake24;13785703]Sorry for the Multiple posts.

Just though about this, but Im just making sure, you did change your speedo gear when you swapped gears right?[quote]

At the time no, but all those mileage figures are corrected for within about .01% of actual by using multiple trips compared to GPS to determine how far off my speedo was. Since I hadn't decide on what gearing I was going to stick with I never swapped it out until about a month and a half ago.. and now I'm changing gearing again (went back to 4.10s but don't like it so going back to 3.07s probably)

Also Im curious about what pump, turbo, and trans you are running.

Mine is a VE pump currently setup basically stock. Once I move I'll probably put an aftermarket pin in it. I had a P pump Ram, I like that pump much better but they can add a grand to the price of an engine. When I Was first building this it was actually my GFs jeep so cost was a factor, that and I couldn't find a P pumped one.

Turbo is an HY35 ( I think) whatever came with it.. I think honestly blanking I deal with turbos everyday and I haven't looked at what that one is in probably 3 years so I"m currently confused and it is at home so I can't check it.

Trans is an Ax15, I may swap to a 3550 since first is much shorter and with 3.07 gears will make stop and go traffic much more pleasant but it has the same .79 5th.

Last, Im curious as to what RPMs you are running at certains speeds (35,45,55,65)

Not an easy one to answer since that would obviously depend on gear.

With the 3.07s, 31s and 5th on the ax15 (.79) it will cruise at 70mph sitting right around 1850 rpm. This is basically optimal for the 4bt to be most efficient.

With the 4.10s it is roughly 2450, this is well outside of optimal and why my mpgs drop from 21-22 to 17-18.

Also with the 3.07s gears rolling on in 5th from say 60 it is a freight train up to 90mph.. With the 4.10s you are sitting in the right lane crying that you can't get out of your own way.


With your 5.38s and 37s assuming for the the calculations you had also a .79 5th 70mph would be 2700 rpm.

To stay around the optimal 1850 your speed would be ~47mph cruising down the highway... Any higher then that you wouldn't even possibly get 20mpg



Do I think I can get 28mpg with the 3.07s back in? Yes on a long flat highway drive where I do under the speed limit by a good deal and hate my life. A group of people got something like 140mpg out of a honda insight, their 30 mile loop took several hours and it took them a week to go through an entire tank of fuel. IF they got caught at one stop light wrong their lap mpg could go down to double digits. Basically my point is yeah anyone can get some ridiculous fuel economy but unfortunately what people like to claim and brag about often do not in anyway reflect reality.

[chris86vw]

Originally Posted by LittleBluE

12v cummins mated to the nv3550 that's what ill be going. Big power and a bullet proof bottom end.

Not saying you can't buy why? (and I have dream built one in my head many times so I like the idea of it..)

the 4bt is the same engine with 2 cylinders lopped off. Hell my intake and exhaust manifold are modified 12V pieces. So it is just as bullet proof.

The 4bt with intercooler and accesories is already about 400lbs more then the 4.0. The 12V will be close to 750lbs heavier. That is a lot of weight for little gains over other options.

It will fit but will take a lot of work. This is the 4bt in mine with no body lift. The engine is IN the firewall, like I can't take the trans out unless i pull the entire drivetrain because there is no room. When I had the wrong passenger side mount in and it collapsed slightly the engine was actually resting on the firewall. I did a body lift just to get AC in since my turbo location blocked the factory lines at the firewall, but it ended up being a blessing since now I think I can pull the trans by itself (maybe) and its no longer rubbing. A 12V would be extremely tight in the front, the location of my engine puts the trans and transfer case about 1" forward of stock just to get the back of the engine to fit around the firewall. The 12V would sit the same and just mean you need another foot of room up front which there isn't.

IT can be done but I see little reason other then bragging rights over the 4bt.

[DeltaBCTJ]

The 4BT being 400 lbs heavier is my main reason for not wanting to go that route, outside of the fact that its much more expensive. The TDI motor is probably 100 - 200 lbs lighter then the 4.0, which is going to increase economy and positively affect the driving characteristics rather then diminish them.

And Jwebber, thats the same company that I was talking to, and are going to drive that red Jeep tonight after work. Its nice that their new system you get to keep your TJ Alternator, power steering pump and A/C pump ( mines dead I'd probably just delete it )

They are supposed to email me a dyno capture of all 3 motors against one another for comparison sakes, I'll post it up here if they get it over to me.

* Also nice cummins pic but air to air intercoolers are not suited well to this application in my mind, and your air filter mounting is... bad? Clean bay though!

Even if I dont go with the HPA kit I'll be doing an air to water system for sure. Air to air on a vehicle that has trouble reaching speeds where it would work is not a good idea.

[chris86vw]

Originally Posted by DeltaBCTJ

Even if I dont go with the HPA kit I'll be doing an air to water system for sure. Air to air on a vehicle that has trouble reaching speeds where it would work is not a good idea.

Not necessarily true. AW still needs to cool the water or it won't work, once the water system is heat soaked creeping a long on the trail will take significantly longer to cool it down then what an AA setup will take.

My intercooler has a massive surface area, it is the one used in the Audi S3/TTS/Golf R and is similar in design to the one used in the rest of the 2.0ts but it has aluminum end tanks and is thicker. On the Audi applications it is mounted like mine is between the condensor and radiator. At a stand still it will creep up in temps if you watch intake temps on a scanner, but as soon as you start moving even a few mph and are not in boost it cools down very quickly. Its what I do for a living I have tested it quite a bit

The reality is this is an application (off road) where turbocharging is really less than optimal no matter what type of intercooler setup you use. There will be sacrifices to make with either AA or AW. But I don't drive NA vehicles so mines got a turbo..

Also the 4bt is available in non intercooled versions, no matter what any intercooler in the system will be better than nothing.


My intake is mounted fine as well, the angle of the pic makes it appear to sit more behind the radiator then it does, which is not at all. At speed there is a fresh flow of air across it and he temps are fine. At crawling speeds it wouldn't matter as even the stock airbox location would heat soak from underhood temps, which are actually quite low.

[BruiserConverts]

Hey everyone. I saw you were discussing diesel conversions, specifically the 4BT, and wanted to see if I could be of any help.

Our company, Bruiser Conversions, specializes in 4BT conversions for JKs and TJs. We also do a variety of other conversions, 4BTs in other models, Hemi conversions, V8 conversions, etc.

The 4BT conversion is an off road only application, not street legal. That being said, depending where you live it may not be an issue for you. Here in Florida, we are able to drive ours daily.

As far as gas mileage, I know our conversions are getting about 28mpg on the JKs and slightly better on the TJs, depending on tire size and gear ratio.

Thanks and let me know if I can be of further assistance.

[clintrivera]

Swapping a diesel motor into a Jeep for better millage doesn't really add up.

Thousands for the motor, parts - days of fabrication...

Extended range in the stock size fuel tank is the real only "logical" reason to swap a diesel.

[chris86vw]

Originally Posted by clintrivera

Swapping a diesel motor into a Jeep for better millage doesn't really add up.

Thousands for the motor, parts - days of fabrication...

Extended range in the stock size fuel tank is the real only "logical" reason to swap a diesel.

Because I can is really usually all the logic I need to do things

Then again most people would probably find no logic in any of my vehicles..

[rda616]

Have you looked at a b3.3 it's significantly lighter then the 4bt. Sadly it makes a lot less torque as well.

[clintrivera]

Originally Posted by chris86vw

Because I can is really usually all the logic I need to do things

Then again most people would probably find no logic in any of my vehicles..

I completely disagree. Your Audi A3 and Jetta 1.8 sound sweet. I even think those rabbit pickups are pretty cool.

I just don't want people to get super excited about USDM diesel Jeep swaps, because - like you said - the only reason to do it is because you can.