12.7 fuel efficiency add ons?

mosinee dave

Well-Known Member
#1
Just bought a 97 fld 120with a 12.7 Detroit . Exhaust manifold is cracked so needs replacing. I see bully dogs ceramic coated are 1400.00. How are those for depentability how about Pittsburgh powers? Have any one else on here taken a older 12.7 and done or added things for better fuel milage? Like the case fuel system?. We have not even put it on the road yet so I Don not know what mpg I will be starting at . Hopefully at 6mpg would be nice to start with. Running reefer in midwest.
 

mndriver

curmudgeon extraordinare
Supporter
#2
Bully dog, Pittsburgh power and full tilt are THE same manifold.

I'd suggest just going straight to full tilt for it. My connection to them? A satisfied customer is all.
Homepage - Full Tilt Performance



We replaced it on the 2003 classic we have and installed a new Borg 171702 non-waste gated turbo on it at the same time we did a full in-frame. You guessed it. Satisfied customer.

Product Index Welcome to Southeast Power Systems - Your Diesel, Turbocharger & Electrical Headquarters

We also replaced his charge air cooler with a brand new duralite evolution because his was slightly leaking. Again. Satisfied customer. I've run an evolution in my 14L for over 3 years now. No issues. Put it in the 12.7 with no hesitation. I put an OEM in my 14L and it was blown in 9 months. Replaced under warranty with the evolution.

Charge Air Coolers | Dura-Lite™

Good tune, good overhead and a mechanically sound engine run at 1500-1550 rpm should be all you need.

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mndriver

curmudgeon extraordinare
Supporter
#5
I really don't think I'd go much more than what I listed.

Get a good overhead ran
Non-waste gated turbo
Good charge air
A good reliable tune.
Good by-pass filter.



I'm in the process of making kits for a by-pass oil filter. 5 micron rating wix 51749. Sending a setup for @JunkYardDog5958 to install on his truck. He is leased on to my company.

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#6
How about installing a fass fuel system? It can help improve fuel efficiency. The mpg increase I got is not huge but still a noticeable improvement. There are other things that I need to do on my truck like getting a turbo, bigger injectors and new exhaust manifold to improve more its mpg.
 

mndriver

curmudgeon extraordinare
Supporter
#7
I'd worry about a solid and tight air induction system, Good turbo, Good injectors and regular maintenance.

Someone would have to show me significant improvements on a dyno before and after to justify the cost of a FASS.

FASS, Air dog and the likes I see as snake oil. And yes, @JunkYardDog5958 just received his AirDog yesterday and is installing it this weekend on his truck. He knows my position on it and such.

I anticipate by July he'll be willing to remove it.
 

ironpony

Well-Known Member
Supporter
#8
I'd worry about a solid and tight air induction system, Good turbo, Good injectors and regular maintenance.

Someone would have to show me significant improvements on a dyno before and after to justify the cost of a FASS.

FASS, Air dog and the likes I see as snake oil. And yes, @JunkYardDog5958 just received his AirDog yesterday and is installing it this weekend on his truck. He knows my position on it and such.

I anticipate by July he'll be willing to remove it.
I got a solid 0.4 mpg increase after installing a FASS on my DD15. The water separation feature alone is worth it for cold weather operation.
 

JunkYardDog5958

Well-Known Member
#9
I'd worry about a solid and tight air induction system, Good turbo, Good injectors and regular maintenance.

Someone would have to show me significant improvements on a dyno before and after to justify the cost of a FASS.

FASS, Air dog and the likes I see as snake oil. And yes, @JunkYardDog5958 just received his AirDog yesterday and is installing it this weekend on his truck. He knows my position on it and such.

I anticipate by July he'll be willing to remove it.
So far nope I like it. Only about 1100 windy af miles on it so far.