Aeromoding my truck ('95 Chevy S10 pickup)

[ac7ss]

I would like to bump this, I am looking at doing the same thing with a Mazda B2600i.

[bennelson]

Hey Guys,

I haven't checked this thread in a while.

Here's an update:

Since getting this truck, I changed the fuel filter, air filter, changed to AMS synthetic oil and filter, removed the belt-driven fan and replaced it with an electric one, and added a partial tonneau cover.

The belt driven fan was replaced with the electric fan pulled out of my Geo Metro being converted to electric. Rather than sell or throw away the fan, I installed it on the truck.

I also made a simple, flat cover that goes over the back of the truck bed. It is just a sheet of rigid plastic I got from a greenhouse that was being remodelled. I can turn it and set it down in the bed if I have some cargo to pick up that would come up past the sides of the bed.

I tried using some of the same material to make a slanty rear cover, but it was too hard to work with the rigid material and get all the angles right. I would still like to explore the idea of making a "wedge" rear out of foam and fiberglass.

I also do some engine-off-coasting, mostly just when coming up to traffic lights.

I am currently getting 30 MPG in the truck.

-Ben

[Big Dave]

Looks like you about where I am.

My take:
Hinges on the cab is not the right answer. The hinges will inevitably foul the air flow and the cab structure is not solid enough for anything heavier than paper. I intend to use a stout front bulkhead to operate the hinges.

We have discussed how far to taper down. For my 80" long bed my new fastback will truncate at 8-10 inches above the tailgate top. That gives me a 12 degree slope where the flow should stay attached all the way to the end. Mine is now 17 degrees and I may be getting flow separation.

[FunkSkunk]

I know the cab hinges won't work exactly because of the flex between that and the bed but if you were able to figure it out, a "piano" hinge would be a very low profile and could be strong enough to handle your bed cover if it was something low weight.

[scopedope]

Ive got one more thing you might think about. You might ask where the truck was built for. I had a 95 sonoma with a 2.2 L engine. I bought it in Colorado and took it to California where I lived at the time. I got a good 30 MPG. When I moved back to Colorado I got 35 MPG. I found out that the computer is programed for a range of altitude. You might look that over as well.