Mission impossible: modding a Unimog

[JasonG]

Gasoline Fumes and I have discussed this at length,
We will be unable to help you without pictures of the subject in both mud and snow conditions
Poised next to a much smaller vehicle would be helpful as well

[usergone]

HAHAHA a unimog! That's awesome! Crazy awesome. And crazy

You could probably increase output and decrease EGTs by upping the injection timing (advance). The way I understand that is that it makes more of the fuel burn in the cylinder and less on the turbo so the EGTs are cooler but the cylinder temps will get a little hotter. Not sure how it would effect FE.

Make sure your injectors are in tip-top shape. I'm not sure how many miles (Km?) are on the stock sticks but with an old 70's diesel, I'm sure they could use some help. Pop-off testing will let you know what shape they are in.

Those recommendations are actually from plenty of lurking over at cumminsforum.com (2nd gen) researching MY diesel engine. If yours has indirect injection... well, I'm not sure.

Of course, you could also change the rear end ratio (like mentioned in that link there) but that may or may not be practical.

Keep us updated and let us know what its FE turns out to be "stock." Should be worth a good laugh

[usergone]

Another thing I forgot: try a BHAF. It isn't as cheap as a stock filter, but it breathes so much better. I ordered one from fleetfilter.com for about $50, part number 2790

http://dodgetrucks.org/photopost/dat...talled-med.jpg

[Ryland]

So what are you going to use this vehicle for and why do you want it to go so fast? if I was driving an 8 ton vehicle that could crush the average SUV, I would drive however slow I wanted.
If you want more power you might check in to how many of the pumps and other PTO loads running all of the time, sure it's nice to be able to hook up a snow blower or trencher, but do you have one? are you using this as a tractor or a truck?

[redneck]

The air filter is oil bath, that has to go

Oil bath air filters are superior in everyway, except one.

Since they do not need replacing at regular intervals, only serviceing, there would be no need for after market sales.

(Oh dear,what would the poor air filter manufactures do...???)




I look foward to following your project...

>

[RobertSmalls]

Originally Posted by bandit86

it would need a 4 foot airdam to get close to th ground so that is out.

You need either a 3.5 foot lowering kit, or a 100% smooth belly pan and some way to get the tires out of the airstream. Tires have absolutely horrible aero drag, so I'd enclose them in Aptera-style fairings.

The DoD is interested in reducing the fuel consumption of the US military. Keep an eye on the ecomods being done to our fleet of off-road capable, overweight trucks.

Also, if you're driving >25mph in a Unimog, or using one for a family vacation, you're doing it wrong.

[usergone]

Something I plan on doing is setting up a fuel cell unit for my engine because there is no (cheap and easy) way to electronically show fuel consumption. The fuel pump is on the side of the engine and the fuel tank just has 2 lines going to it, so volume/weight measurements should not be too hard.

I wonder what its FE would be in top gear just idling along (at 15 MPH, lol) but don't hurt your engine (don't suck a liner)

[UFO]

Originally Posted by RobertSmalls

Also, if you're driving >25mph in a Unimog, or using one for a family vacation, you're doing it wrong.

Considering how slow the vehicle is, I'm wondering if there is any benefit at all to doing aerodynamic modifications. It's just so heavy the mileage will always suck.

[mnmarcus]

Gasoline Fumes and I have discussed this at length,
We will be unable to help you without pictures of the subject in both mud and snow conditions
Poised next to a much smaller vehicle would be helpful as well

I vote for on top of any other vehicle!

[RobertSmalls]

Originally Posted by UFO

Considering how slow the vehicle is, I'm wondering if there is any benefit at all to doing aerodynamic modifications. It's just so heavy the mileage will always suck.

Have you ever felt the wind load on a bicycle at 15mph?

Sure, the mileage will always suck, and it will never be the right vehicle for transporting people where there are roads, but are you interested in mileage that sucks less badly?