June 12, 2004Hey i was wondering how to boost the fuel efficiency of an 86 F-150 and a 95 F-150 without power loss?
June 15, 2004Underdrive pulleys, ignition mods (coil, wires, and box), electric fans, and in some cases exhaust mods will improve mileage.
I have a `95 4x4 with the 302 and was lucky to break over 13 mpg when I got it. Ignition mods gave me the largest mileage gain, with a small boost from both the underdrive pulleys and the exhaust.
I can usually get over 15 mpg now with about the same drive cycles (mostly around town). If I stick to the speed limit or close to it I can hit 20 mpg on the highway.
You didn`t mention what engines you have in the trucks, but in my observation the 302 will get much better mileage than the 300 or 351 will in most cases.
June 17, 2004Both trucks have the 300 6 in em
the 86 is a 2by with carb, and the 95 is a 4by with fuel injection
the 86 gets about 22, and the 95 gets about 18, and with rising gas prices i wouldn`t mind gettin a bit better
i was thinkin bigger exhaust and air intake, and maybe an electric fan
could you explain a bit more on the ignition mods
June 19, 2004Jess,
The exhaust may help some. On my 302 I did the exhaust last and it still gave a small increase.
For ignition mods quality wires, a hotter coil and a multi spark box will help. From what I`ve seen most of the mileage comes from the wires and coil, though it may not help as much on the 300. Better wires and coil, with or without a box, allow larger gaps for a bigger spark kernel.
The electric fan should help for sure. A lot of people are modifying stock fans off of Crown Victorias and using them.
The intake is a good mod for power increases, but really shouldn`t affect mileage. More air in = more fuel to compensate. When I modded my intake I didn`t get any milege gain that I could notice.
June 19, 2004Are they autos or manuals? If manuals, what`s your shift points?
June 19, 2004so air itake will make it suck more gas?
or am i reading that wrong
and the 86 is a 4 speed manual, and the 95 is a 5 speed manual
and by shift points do you mean revs or speed at which it is shifted at?
June 19, 2004What he meant is that for a more air to make more power, you`d need a proportional amount of gas also. Shift points - rpms at which you shift.
quote:Idk, on average, I get about 210mi/tank with my 300.
You didn`t mention what engines you have in the trucks, but in my observation the 302 will get much better mileage than the 300 or 351 will in most cases
June 19, 2004ok i understand now
umm im not to sure what rpm`s i change gears neither of the two trucks have tac`s on them
June 19, 2004Im not sure about the milage, but I have heard that putting an electric fan in will give you an added gain of up to 20 hp. Id sure love to get one, but I need to get caught up on bills first.
June 20, 2004Jess,
If you drive it the same the intake shouldn`t hurt mileage, but people tend to use the added performance from a modification. The air/fuel mixture will be adjusted to compensate for the added air in those times you get hard onto the gas pedal.
The 300s make good low rpm torque, so you might do a little better short shifting it, depending on what points you shift it at now.
There are a lot of people using single cheap fans and/or junkyard fans that were cheap with no problems. There are also some inexpensive single fans that can be used with a shroud and work just fine.
The kits with dual fans and a new shroud are nice, but the price isn`t justtified in my opinion. There was a guy with a 1st generation Lightning with a blower that used a single cheapie Hayden fan with no problems, and he was pushing 400+ rear wheel HP.
If you`d rather wait and get the nicer fan kit, consider the underdrive pulleys. Both do the same thing essentially, that is reduce parasitic losses that rob power from the engine. Though the fan still turns the pulleys also slow down the other accessories, so the power gain isn`t that much down from fans in most cases I have seen.
I think the big problem with 300 mileage is usually too short of a gear. With the right rear end they seem to do ok, but tend to suck gas as the revs climb some. What does your mileage work out to in MPG?
June 20, 2004MPG?...Idk. Can`t seem to figure out my rear tank capacity. Book says 18 or 19 (can`t remember), but I fill up at 1/8tank and can only put about 13.5 gallons in at best (without needle sitting on "E"). Changed the computer from the stock 1987 2wd unit to the computer for the motor, 1991 4wd unit. Can`t say if that had to do alot with mileage or not as I had my rear gears put in the next day. But, with the two mileage jumped from about 160/170miles/tank to my best of 238miles/tank....haven`t been able to do that again...Right now I`m running 32x11.5 Dueler A/Ts and 4.10 gears....shifting around 2500rpm; at least that`s what I noted today on the way to church at 2-3, 3-4 shifts.
Edit: Oh yeah, I`m also running the stock air box *no drilling*, OE replacement paper filter and dual 2" head pipes to a 2" DI/2.5" SO cat (factory dual cats removed and replaced with the one) handing off to a 2.5"SI/SO Magnaflow following out to a Y-pipe to 2.5" pipes leading to 3x18" tips. Other than a somewhat new tune-up *a year old* that`s all the mods I have to my truck.
[ 06-20-2004, 01:08 PM: Message edited by: Dave ]