A little insite please!
#1
A little insite please!
ok I have a 99 dodge ram 1500 5.9 gas auto, I tuned it with hemifever tuning, glass pack. My question is I put a 3 inch lift in it than 285/75/16 tires and regeared it I usede to get 15 mpg out of her and had good power on the highway but after tires and re gearing and its bad. I put 4.10 in it and at 120km/h its around 2300 rpm. wich is good but I get like 8 to 10 mpg now. and towing a light load down the highway its sluggish to accelerate. is this normal for a lifted truck with bigger tires? or am I crazy ?
#2
The 5.9 isn`t known for good gas mileage even in stock form. But now that your running bigger tires and gears, and your using a hemifever tune your making more power, but the trade off is lower gas mileage. and also consider the 3'' lift, it doesn`t help gas mileage at all.
As far as your truck being sluggish, it shouldn`t be. Are you running premium gas with your tune ?, if not, you should be. Check for vacuum leaks, when was the last time a complete tune up was done ?.
As far as your truck being sluggish, it shouldn`t be. Are you running premium gas with your tune ?, if not, you should be. Check for vacuum leaks, when was the last time a complete tune up was done ?.
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I'm in a similar situation (1996 1500 4x4/5.2/auto/hemifever program running the lowest setting with 87 octane gasoline/2" lift/4.10 gears/285-75-16" tires, roof height fiberglass topper) and getting around 10-11 mpg. I've also got a 50mm Fastman throttle body & factory air cleaner set-up, low restriction magnaflow muffler. Very recent rebuilt fuel injectors installed and Melling high-volume oil pump, and a recent new fuel pump. It's not a slug, but it's not a speed demon either. Aerodynamics of a brick - got it. Plenum replaced way-back-when.
So dumb question, but what do you all consider a "tune-up"? Would my mpg improve if I ran a higher octane gasoline and the next higher hemifever program setting? All the "parts" on the throttle body (the plug-in things) are factory originals (and I gave the throttle body a good cleaning when I had it off when replacing the fuel injectors).
I love my truck (just over 200,000 miles) but would love a few more mpg.
So dumb question, but what do you all consider a "tune-up"? Would my mpg improve if I ran a higher octane gasoline and the next higher hemifever program setting? All the "parts" on the throttle body (the plug-in things) are factory originals (and I gave the throttle body a good cleaning when I had it off when replacing the fuel injectors).
I love my truck (just over 200,000 miles) but would love a few more mpg.
Last edited by armynurse; 07-13-2014 at 09:33 PM.
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#8
I'm in a similar situation (1996 1500 4x4/5.2/auto/hemifever program running the lowest setting with 87 octane gasoline/2" lift/4.10 gears/285-75-16" tires, roof height fiberglass topper) and getting around 10-11 mpg. I've also got a 50mm Fastman throttle body & factory air cleaner set-up, low restriction magnaflow muffler. Very recent rebuilt fuel injectors installed and Melling high-volume oil pump, and a recent new fuel pump. It's not a slug, but it's not a speed demon either. Aerodynamics of a brick - got it. Plenum replaced way-back-when.
So dumb question, but what do you all consider a "tune-up"? Would my mpg improve if I ran a higher octane gasoline and the next higher hemifever program setting? All the "parts" on the throttle body (the plug-in things) are factory originals (and I gave the throttle body a good cleaning when I had it off when replacing the fuel injectors).
I love my truck (just over 200,000 miles) but would love a few more mpg.
So dumb question, but what do you all consider a "tune-up"? Would my mpg improve if I ran a higher octane gasoline and the next higher hemifever program setting? All the "parts" on the throttle body (the plug-in things) are factory originals (and I gave the throttle body a good cleaning when I had it off when replacing the fuel injectors).
I love my truck (just over 200,000 miles) but would love a few more mpg.
If the gas were you live has ethanol in it, it will rob power and performance. I can`t run the lower grade gas in my truck here were I live because of the ethanol, my truck runs like crap. I run nothing but premium all the time now and my truck runs good and has more power.
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