Better gas milage on f40

Joined
Jul 22, 2005
Messages
1
Location
Grand Junction, CO
Hi all, i'm looking to buy a mid 70s FJ40, right now i'm seeing between 10-15mpg on these. I'm also a novice to this sort of thing, but how could i increase that and still maintain power/offroadability? Thanks!
 
Joined
May 3, 2004
Messages
2,240
Location
Utardia
10-15 is a pretty big jump.

I average 14-16 w/ 2F SM420/4.11's and 35's.
Timing and carbureation are key.

Theres lots you can do to improve it.

SEARCH.
 
Joined
Jul 7, 2004
Messages
1,518
Location
EVERGREEN, CO, USA
I get around14-17 with a 1979 mostly stock FJ40. A Jacobs electronic ignition will help, but not much. Champion spark plugs will help a little. Timing will help a lot. Actually, the year of the FJ40 is important too. Some of the older FJ40's got fair mpg. I've never heard of a stock cruiser of any model get much over 19 mpg...
 
Joined
Jul 2, 2002
Messages
1,424
Location
New Hampshire
Short of diesels, I've never heard of a cruiser getting better than 20mpg. You can do what I do. Drive it once or twice a week and drive something else the rest of the time.
 
Joined
Jan 3, 2003
Messages
7,167
Location
McCall, ID
I get 15-17 with a stock points/carb non-USA system on both of my rigs. Up to 18.5 under ideal driving conditions and with AT rather than MT tires. 10 mpg is probably a bad tuneup, smog stuff, and a heavy right foot.
 

Pin_Head

 
 
 
Joined
Feb 6, 2002
Messages
14,797
Location
OC, CA
I get more than 25 MPG in an FJ40 with a stock 2F with 35s.





















But that is only going down grade with the engine off (Mexican overdrive). :flipoff2:
Otherwise I get 12-13 MPG.
YMMV, but not much.
If the mileage bugs you, get a beater Honda Civic for DD.
 

PabloCruise

SILVER Star
 
Joined
Jun 3, 2004
Messages
17,510
Location
Northern Colorado
When you get your 40, tune it up!

My mileage went up (at the same time going from stock rubber to 33x12.50) to 13-15 after I got the carb and dizzy rebuilt by Jim C.
 
Joined
Jun 11, 2005
Messages
30
Location
AZ
Put in a nice mild cammed, Quadrajet carbureted small block Chev and keep your foot out of it. That's not as much fun but you have to choose
 
Joined
Mar 25, 2005
Messages
591
Location
Spring, Texas
i was getting about 12MPG, i had a Weber 38, header, 3.73 gears and 33in tires.

my motor only lasted me 17,000 miles, so now its rebuild time.

i am planning on running a MAF RV Cam, the Weber, header, try to have the head wet flowwed, ported and polished, and some bigger intake and exhuast valves. i still need to check on prices of it all, so once im all done and back on the road ill post my new MPG
 

Mace

rock scientist..
Staff member
s-Moderator
 
Joined
Feb 17, 2002
Messages
21,435
Location
Las Vegas
FJ40onNOS said:
i was getting about 12MPG, i had a Weber 38, header, 3.73 gears and 33in tires.

my motor only lasted me 17,000 miles, so now its rebuild time.

i am planning on running a MAF RV Cam, the Weber, header, try to have the head wet flowwed, ported and polished, and some bigger intake and exhuast valves. i still need to check on prices of it all, so once im all done and back on the road ill post my new MPG
Port and polish and the bigger valves is a waste of time.
 
Joined
Sep 26, 2005
Messages
86
Location
JP, MA 02130
i just ran up to Portland, ME on saturday with my newly de-smogged, headered and tuned 2F and did the 110 miles on 8 gallons. that's 13.75 mpg.

not too bad, and there was a bit of ping in it when i was pushing into it on the upgrade. i was told my non-USA carb has a bit of a vacuum leak at the throttle shaft where it passes through the carb body. apparently it has worn over time, (15 years) and that it is irrepairable.

does this sound like a legit issue? i'm thinking i may buy a new carb during the SOR holiday sale.
 
Joined
May 15, 2005
Messages
1,142
Location
Anchorage, AK
Mace, I would have to disagree with you on that statement about port and polishing. The valves might not help, but gasket matching and polishing the head would make a huge difference. The thing would flow much better!!! Less resistance since the air chambers had been polished.

later

Ryan
 
Joined
Mar 25, 2005
Messages
591
Location
Spring, Texas
Morse_FJ40 said:
Mace, I would have to disagree with you on that statement about port and polishing. The valves might not help, but gasket matching and polishing the head would make a huge difference. The thing would flow much better!!! Less resistance since the air chambers had been polished.

later

Ryan

well, im going to check on the cost and thinking about it.
 
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