Diesel Jeep Build Thread
 

What kind of build? Im not sure. Ill either lift it and modify an 08 bumper to fit it. Or lower it and paint some SRT-8 bumpers to match.

But for tonight, painted and cleared diff cover... yes, this is what I do at 1:30am

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For tomorrow: Installing an aviation oil separator. Lots of the diesel Jeep guys are having problems sucking in too much oil, causing a leak on the intake and a failing swirl motor. Hopefully this will fix the problem.

Lift!

Haha, coming from the guy with a BBC muscle car, a supercharged daily driver, and a lifted tank. Tell me Ron, why do you hate your gas mileage so?

The last trip I made out to a customers in Woodland Hills I pulled just over 23mpg. That was driving at 70-75mph there and a combination of 65-70 with stop and go home. I don't think that's too bad for a daily driver.

Damn... not not at all. Thats some tune you got there.

I hate it when muscle guys joke about mpg. Im always just thinking, well buy a wideband and tune it. My Vette isnt bad either, I do about 20 on the freeway. AFR was tuned for 14.7 idle and freeway, but depending on the temp it can richen up all the way to high 13s. Cant avoid that with a carb.

Some guy at Fabulous Fords with a blown 1st gen was joking about getting 6mpg "all tuned up." Hire a new tuner and stop wasting our fuel.

MPG has a lot to do with how you drive. On long trips with the 302 the Cobra would pull around 21 when driving at around 70-75. When I took it on the Roval I got about 3MPG.

The blue truck after all the work gets about 21-24 mpg with mixed asshole driving. I'll see what it gets with economy specific driving but I doubt it'll be much better.

Diesels are awesome, Im sure your gas truck got 12 or 13. Ive heard guys who lift their Diesel Jeeps are doing as bad as 12-13 though, depending on how crazy the lifts get.

I know the new super dutys got around 20 average, what have you done to yours to get it so high up?

The tuner for mine is supposed to get it up 2-4 mpg and then removing the DPF does another 2-3 mpg. Ill bet I could hit 30 with all of that done and some conservative driving, maybe some SRT suspension too.

Uhm my old 89 F150 with the GT40 motor got like 8 haha

My truck now has what 99-03's had standard but about 1500lbs lighter. I have slightly smaller injectors and bellowed upipes and no fuel leaks. The truck hardly smokes at all anymore (disappointed cause diesel) because of the extra boost.

The dpf removal is HUGE, the 08 was getting like 10-11 highway. After the DPF removal, tune, exhaust blah blah. I was up to low 20's, pretty great.

That tuner is the first thing on my list, cant wait to ditch the DPF

6NW 009 228 Electronic Turbo Actuator

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A few weeks ago I posted about my turbo making too much boost, causing premature rev limiting and ultimately limp mode/ ETC failure, the electronic actuator was sticking open. The lovely folks at Jeep and Mercedes do not sell a replacement turbo actuator, they sell it with the turbo... for $4,000, or $6,000 installed. Yeah. This is a very common failure for Diesel GCs.

Theres a company called BBA reman in Canada (avoid BBA reman USA, theyre idiots and cant help) and they rebuild these actuators for $250. Lifetime warranty.

So, a few weeks of downtime and $250 plus $50 shipping later and my Jeep is whistling again like it should.

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Black box to the left of the turbo. It took 3 bolts and a c-clip to remove this thing, and Chrysler / Mercedes wont sell it separately. Hmm, sounds scamarific to me.

I converted mine to a manual setup. Makes woooosh and smiles happen

If I couldnt get this rebuilt I was going to try that, theres no fucking way I was about to let Jeep rape me for $4K. Id sooner pay a day laborer to sit in there and move the arm back and forth.

But a manual actuator would have wanted to sit sticking out of the hood the way the arm on the waste-gate sits. Would have been a pain in the ass to mount it. My motor doesnt sit ten inches below the hood like your superduty

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Oil separator installed.

Mine doesn't either. And it's not a superduty, it's a heavy duty. Turbo is so large it touches the cowl and makes all sorts of racket.

I see. Nevertheless my waste-gate arm lifts up towards the hood, dont see how I could mount a manual actuator.

Could always close it off completely and put a BOV on it.

Hmm

Just curious though, how would a BOV operate since diesels dont make vacuum

So I found that the boost hose had slipped off of my intercooler. Ive been driving like that since I bought it. Put it back on and its not any faster... which tells me the computer must be limiting the crap out of the turbo. I can see why it makes another 100 horsepower with a tune.

Your engine should have a vaccum pump which would operate the BOV.

Vacuum pump pulls vacuum constantly, it wouldnt know when I was letting off the throttle

They do, since generally it's serpentine controlled. The wasted gate on my turbo is vacuum controlled and operates just fine.

But its still pulling enough vacuum to operate the brakes, thus, too much vacuum for a BOV to open.

Maybe your diesel has a throttle plate

Nope. Speed density drive by wire.

Ya mine doesnt either, the Liberty diesels do, strange.