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Oakland, CA

Posted By Bakari

Back when I began I set a totally baseless "goal" of 25mpg.

That would make my (CAFE exempt) 2.5-ton full-size commercial truck more fuel efficient than the average passenger car on the road today.

The changes since I last posted:

-Replaced mechanical vacuum pump with an electric one (from the wrecking yard - they don't have a list of cars, and most of the insignias have been pulled off, so I had to check each one.  I found it in the very last row, after having gone through probably 200 or so)  This allowed me to remove the alternator belt altogether.

-Replaced belt driven radiator cooling fan with an electric one.  It has a thermostat, so it only goes on when its actually needed.  It also weighs about 1/10th as much, so it doesn't require as much energy to turn.


-Added an underbelly pan from the front bumper to around 1/2 back to smooth out airflow beneath the vehicle, along with little spoilers in front of the front tires (they were big spoilers at first, but they rubbed the wheels at highway speeds and wore away) 

-Removed the windshield wipers to make it a little more aerodynamic.  They, along with the alternator belt, live inside the cab now just in case I need them unexpectedly.  They de/reattach with no tools in just a couple seconds.

-Replaced the grill tape with a sheet of coroplast (same stuff the belly pan is made from) so it can be removed easily in hot weather. The engine runs better warm in general, but the new fan isn't quite as powerful, and between that, the grill blocking, and driving (faster than usual, 65mph) in the hills during the brief hot weather we had last week, it did overheat once, so I thought it better to make something that could quickly and easily be removed and replaced later.

-Removed power steering pump and replaced steering gear with a manual steering gear.

I've also added a solar panel, changed my aux driving lights to 5w LEDs and moved them to inside the grill.

The average brand new passenger vehicle (inc. cars and light trucks) gets 26.7mpg.

On my last fill up my 1983 commercial (heavy) truck got 26.85mpg

2 Comment(s):
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April 28, 2017 4:13 AM
sam said...
nice: have you though of this? the back bumper is dragging air have you though of the nascar tricks from the 50's and 60's (when they were stock cars)? they either trimed or built dam to keep sides of bumpers out off air stream, plus air holes in bumper and rear fenders. they did this also to door handles. the air under your hood may not have a way out at higher speeds and acually increase milage. i have gotten some improvment using synthic grease in trans and rear and wheel bearings. i use a rechargeable jumpstart battery to power an inside auto fan and cell could also run radio. this can be charged at home/solar or auto. oh the underside of rear bumper needs to be filled and smoothed out, nascar guys also built dam to deflect air on rear axle and springs etc. one other thing you may put slimer tires on front with a slight foward rake. a part i would like to try is warp around bug deflector that fits a crowl instead of hood and covers wipers smoothly. how about smaller rear view mirrors?
June 4, 2009 4:55 PM
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