460 tuning
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Junior User
Joined: Nov 2002
Posts: 97
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From: Morristown USA
460 tuning
Getting real tired of the 6 MPG and the expense of the emission sensors. Codes say that my EGR, EVP and O2 sensors are bad. Replaced EVP, O2 and cleaned the EGR. Was going to check it out for mileage, but had an exhaust leak on the cat. It seems there is a factory hole on top for what I'd guess is the air pump. Bottom line is that I want to get rid of emission sensors and put on a decent exhaust. This is a farm truck that I use to haul trailers and hay, not too worried about emissions..
Any ideas?
Any ideas?
New User
Joined: Sep 2003
Posts: 14
Likes: 0
From: Southwest Montana
460 tuning
6MPG? I have not heard of that since the '70s. What year is your truck? How is it equiped?
I have a '93 F250, 460, 4x4, 5 speed with 3.55 axle ratio. Empty it gets 14MPG driving back and forth from Anaconda MT (elv. 5280) and Helena MT (elv. 4300) at 65mph -- this trip includes crossing the "great divide" on McDonald Pass (elv. 6300).
Loaded, pulling a double with a 19', 4500 pound travel trailer and a '64 CJ5 at 2300 pounds, the worst it has ever gotten is 8.7MPG.
Please note that pulling a double requires a level of concentration and situational awareness that is exhausting. Even gentle curves require you to slow down to avoid oscillation. Minor steering corrections must be made with great care.
I have a '93 F250, 460, 4x4, 5 speed with 3.55 axle ratio. Empty it gets 14MPG driving back and forth from Anaconda MT (elv. 5280) and Helena MT (elv. 4300) at 65mph -- this trip includes crossing the "great divide" on McDonald Pass (elv. 6300).
Loaded, pulling a double with a 19', 4500 pound travel trailer and a '64 CJ5 at 2300 pounds, the worst it has ever gotten is 8.7MPG.
Please note that pulling a double requires a level of concentration and situational awareness that is exhausting. Even gentle curves require you to slow down to avoid oscillation. Minor steering corrections must be made with great care.
Last edited by llasalle; Sep 10, 2003 at 01:11 AM.
New User
Joined: Sep 2003
Posts: 14
Likes: 0
From: Southwest Montana
460 tuning
hansont:
What is your axle ratio? 3.55? 3.73? 4.10?
Is your truck conventional or stretch cab?
When you get 6mpg are you loaded heavy or empty? Are you towing? If so, what is the GCVW?
What are the driving conditions? Low range 4x4? Highway? How fast? City (stop and go)? Short trips (10 miles or less)?
Hey you guys out there, what do you get with '89 460's with C6 trannys?
What size tires are you running? At what pressure? Custom wheels? What size? (16x6, 16x7, 16x8 etc.)? Deep dish wheels?
Big, agressive, deep lug, off road, traction tires can cut your fuel economy severely.
What is your axle ratio? 3.55? 3.73? 4.10?
Is your truck conventional or stretch cab?
When you get 6mpg are you loaded heavy or empty? Are you towing? If so, what is the GCVW?
What are the driving conditions? Low range 4x4? Highway? How fast? City (stop and go)? Short trips (10 miles or less)?
Hey you guys out there, what do you get with '89 460's with C6 trannys?
What size tires are you running? At what pressure? Custom wheels? What size? (16x6, 16x7, 16x8 etc.)? Deep dish wheels?
Big, agressive, deep lug, off road, traction tires can cut your fuel economy severely.
Last edited by llasalle; Sep 11, 2003 at 10:05 PM.
Thread Starter
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Junior User
Joined: Nov 2002
Posts: 97
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From: Morristown USA
460 tuning
89 F-250 standard cab, 460 EFI, 235/85-16 radials, 4.10 gears. Bone stock as they come. I've changed every filter, wires, plugs, O2 sensor, EVP snesor, cleaned the EGR. Still 6 MPG running unloaded, with a light foot...
New User
Joined: Sep 2003
Posts: 14
Likes: 0
From: Southwest Montana
460 tuning
What color are your spark plugs? Your engine has EFI right (not carburated)?
One must wonder if your engine is burning way too rich? Has it been checked on a diagnostic machine?
Have you had your tranny and torque converter checked? Has your tranmission been serviced lately?
Have you checked for exhaust restrictions? Have you had you catalytic converter checked?
One must wonder if your engine is burning way too rich? Has it been checked on a diagnostic machine?
Have you had your tranny and torque converter checked? Has your tranmission been serviced lately?
Have you checked for exhaust restrictions? Have you had you catalytic converter checked?
Last edited by llasalle; Sep 11, 2003 at 10:50 PM.
