Quote:
Originally Posted by aardvarcus
Hello all. I acquired a 1994 K2500 Diesel GMC Suburban to build up to eventually replace my 2005 Toyota Tacoma.
There were a lot of drivers into this decision. My basic requirement was low long term cost of ownership balancing cost, MPG, maintenance, insurance, etcetera. In addition the vehicle had to have room for my family and friends, able to tow and haul, and had to be 4x4. After significantly overanalyzing vehicle options (understatement) I decided a factory diesel 90s model GMT-400 Suburban was the right vehicle for what I need/want, realizing it will take some work to get it to the MPG I wish to hit.
I am very familiar with this GMT-400 platform having owned and worked on a 1991 K2500 LD truck, and several good parts from this truck will be swapped over (NV4500, NP241, etcetera). The suburban I got has 210k on the clock, but I plan on replacing the powertrain anyway and will eventually rebuild most of the major systems to end up with a like new vehicle. It functions now but I won’t be driving it until I get the powertrain rebuilt and have confidence it is reliable as I have no need for another vehicle until it can replace my Tacoma.
My short term goal is to hit 30 MPG consistently. My long term goal is to hit 40 MPG on most tanks. I think my current plan I will outline in a few posts below will get me at least to the first goal, the second goal will probably take lots of optimization of details beyond what is listed.
Please feel free to comment and offer suggestions, I post to get input and feedback.
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Front end swap to a GMT900 hybrid that will take the front end to 0.34 from your
"square brick" is.. probably 0.6-0.7 or so... also get the running boards and the two pieces that connect to them
(wont help the windscreen tho)
Get electrical fans from the hybrid they cool a 6.0l engine this will save about 1mpg or 15-20HP on the spot
Get a NNBS alternator or something with a bit more low end power (for the E-fans)
get the mirrors off of it as well
Rear Aero wing this will be hard to install as you have barn doors possibly consider a two piece setup...
on this 6.0l i was barely able to get 31MPG city (hybrid) so good luck with ICE only 100% stock
25-28 is what I see on the highway
but tonight I barely got 21 due to wind etc..