Replace the feedback system?
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Freshman User
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I was a bit concerned when I first started with the truck. I bought it Thursday and when I looked online it seemed everyone says to pull it off and install a DS2 and regular carb. I was thinking of going down that path as well in the beginning but now think it might be best to keep it since its starting to get worked out. Its really not all that complicated, at least not yet...
I'm wondering if I could get the same type of gas mileage out of a converted truck?
I don't know what the gear ratio is, but it probably is a 3.08. This thing is geared pretty high! Almost too high in my opinion.
I'm wondering if I could get the same type of gas mileage out of a converted truck?
I don't know what the gear ratio is, but it probably is a 3.08. This thing is geared pretty high! Almost too high in my opinion.
Fleet Mechanic
Joined: Jun 2010
Posts: 1,251
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From: North Carolina
I was a bit concerned when I first started with the truck. I bought it Thursday and when I looked online it seemed everyone says to pull it off and install a DS2 and regular carb. I was thinking of going down that path as well in the beginning but now think it might be best to keep it since its starting to get worked out. Its really not all that complicated, at least not yet...
I'm wondering if I could get the same type of gas mileage out of a converted truck?
I don't know what the gear ratio is, but it probably is a 3.08. This thing is geared pretty high! Almost too high in my opinion.
I'm wondering if I could get the same type of gas mileage out of a converted truck?
I don't know what the gear ratio is, but it probably is a 3.08. This thing is geared pretty high! Almost too high in my opinion.
The rear gear ratio code is printed on the sticker inside the driver side door. As for the "almost too high gearing" - I agree. I think a 3.55 rear end would be the perfect compromise. What size are your tires? If they are bigger than stock, that will exagerate the "too high" feeling of the gearing. Smaller tires give you more low-end grunt.
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From: Virginia
Just like the new diesel fuel, you will not get the same fuel mileage they used to get in the old days because of the new gasoline they sell, with all the ethanol in it. The more alcohol in the gas, the less fuel mileage you get.
If you are going to be doing more of that 70mph+ driving, I would leave the 3.08 gears in it. Shorter trips and more load hauling, then yes I would consider a higher numbered gear.
If you are going to be doing more of that 70mph+ driving, I would leave the 3.08 gears in it. Shorter trips and more load hauling, then yes I would consider a higher numbered gear.
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Just like the new diesel fuel, you will not get the same fuel mileage they used to get in the old days because of the new gasoline they sell, with all the ethanol in it. The more alcohol in the gas, the less fuel mileage you get.
If you are going to be doing more of that 70mph+ driving, I would leave the 3.08 gears in it. Shorter trips and more load hauling, then yes I would consider a higher numbered gear.
If you are going to be doing more of that 70mph+ driving, I would leave the 3.08 gears in it. Shorter trips and more load hauling, then yes I would consider a higher numbered gear.
The truck actually drove better at 70+ than it did at 65. I'd lose MPH on a hill around 65 but keep it at 75 or so. There are 31's on the truck now and I'm not sure anything less would look ok.
I won't be hauling a lot in the truck. I have another vehicle that will tow much better than it could even with a different ratio. Later down the road I might look at putting posi in it with some 3.55's since I'll probably keep the same size tires on it.
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I rebuilt the carb this weekend and used the tuning steps here to tune it and the timing. I had a bad bog off idle when giving it some fuel that made it a pain to drive. When it was cold it ran like a champ though.
Now I still have a small bog if floored during idle, but it is something I can live with. I'll work on getting that sorted out at some point.
Now I can put it in OD and cruise at 45mph without a problem. After fixing an bad exhaust leak the truck is pretty nice to drive now!
Now I still have a small bog if floored during idle, but it is something I can live with. I'll work on getting that sorted out at some point.
Now I can put it in OD and cruise at 45mph without a problem. After fixing an bad exhaust leak the truck is pretty nice to drive now!
Post Fiend
Joined: Jul 2004
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From: Northern California
Yes, if they have been in there for ages. I use anti seize lube on the threads.
Only other things I can think of is a choke adjustment if it's not opening up enough, or a slight adjustment to the fuel ratio is needed.
Only other things I can think of is a choke adjustment if it's not opening up enough, or a slight adjustment to the fuel ratio is needed.
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MPG update...
Over a mixed 82 miles I averaged basically 21 mpg. (3.91 gallons with two shut offs of the nozzle) Most of the traffic was not the best for mileage either so I am tickled pick with that.
One issue I am dealing with now is ignition timing. When I have it set up for good warm/hot starting I have a good amount of pinging. When set for no pinging I have a hard time starting when warm/hot. I have been running regular gas and will try a better grade to see if that helps, but don't really want to go that route.
The next issue is a choke one I think. If the truck dies about within about a minute of running is it very hard to start. Cold and normal driving temps I have no problems. It is only during that limited time.
Over a mixed 82 miles I averaged basically 21 mpg. (3.91 gallons with two shut offs of the nozzle) Most of the traffic was not the best for mileage either so I am tickled pick with that.
One issue I am dealing with now is ignition timing. When I have it set up for good warm/hot starting I have a good amount of pinging. When set for no pinging I have a hard time starting when warm/hot. I have been running regular gas and will try a better grade to see if that helps, but don't really want to go that route.
The next issue is a choke one I think. If the truck dies about within about a minute of running is it very hard to start. Cold and normal driving temps I have no problems. It is only during that limited time.
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Smog pump was gone when I got the truck and I can find no good reason to replace it. As I understand it, it was a pure emission control piece and added no value to anything else.
My cat was gutted by the previous owner so the smog pump wouldn't do anything even if I put a working one on it.
My cat was gutted by the previous owner so the smog pump wouldn't do anything even if I put a working one on it.
Post Fiend
Joined: Nov 2008
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From: McKenzie River
I have converted every Ranger/ Bronco II with 2.8v6 and Feedback carb TFI ign. that I have owned, to Dura-spark.............The results are like night and day, much more power and better mpg if you drive conservatively.
The feedback TFI system is too hard to keep running these days, too many unreliable, hard to obtain sensors..........Dura-sparked, the same rig will run circles around its feedback counterpart.
The feedback TFI system is too hard to keep running these days, too many unreliable, hard to obtain sensors..........Dura-sparked, the same rig will run circles around its feedback counterpart.
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Would that be possible with a dura spark conversion? The early model DS model trucks with my drivetrain appear to be capable or even better than that from the factory. I'm really thinking of trying....
Right now I am curious to see how good this system can be. There isn't much more I can do at this point other then iron out the choke and timing issues. Once I get it going I will look in to doing the conversion. I will probably go with HEI option though and keep the current wiring....
Post Fiend
Joined: Nov 2008
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From: McKenzie River
2.8 v6 5spd 4x4 Ranger..........
Feedback/TFI........15-16mpg city - 19 hwy
After Dura-spark.........18 mpg city - 22-27 hwy depending on load
And it pulls hills effortlessly, that it used to struggle on.
Feedback/TFI........15-16mpg city - 19 hwy
After Dura-spark.........18 mpg city - 22-27 hwy depending on load
And it pulls hills effortlessly, that it used to struggle on.
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Cool thanks, mine is locked up so good to know I don't need another I am going to do the DSII conversion this weekend. I am also interested to see what kind of MPG I can get out of it with the conversion.
Smog pump was gone when I got the truck and I can find no good reason to replace it. As I understand it, it was a pure emission control piece and added no value to anything else.
My cat was gutted by the previous owner so the smog pump wouldn't do anything even if I put a working one on it.
My cat was gutted by the previous owner so the smog pump wouldn't do anything even if I put a working one on it.