5.3/4l60e swap complete, 11.5 mpg!!! - JeepForum.com

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post #1 of 68 Old 12-02-2008, 02:46 PM Thread Starter
lumpster
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5.3/4l60e swap complete, 11.5 mpg!!!

WOW, i got done with this swap last week, drove it 32 miles one way ot work a few times, got on it some, but mostly highway. i just filled up today, and i got 11.5 miles to the gallon. WTF??

i thought i would get at least the same milage as my 4.0, this sucks.

although it does run like a scalded dog, i am thinking there might be something wrong, i had one of these motors in my 2003 silverado and i got 16-18 mpg's

any suggestions?

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post #2 of 68 Old 12-02-2008, 02:47 PM
rubidriver
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What gear/tire set up are you running?

What kind of RPMs are you pushing at 70 mph?

2005 Black Rubicon - OME 933/942 - 4" Bilstein 5100 (canister up) - JKS Adj Track Bars Front/Rear - JKS Quicker Discos - 285/75/16

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your money will go farther in College Station.
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post #3 of 68 Old 12-02-2008, 02:52 PM Thread Starter
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2000 5.3/4l60e
3.73's 31's
2k at 70mph, TC locked up
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post #4 of 68 Old 12-02-2008, 02:57 PM
rubidriver
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Thats an excellent rpm for the 5.3.
How many miles on the motor?
How fast were you going when you did the mpg?
What process did you use to do the mpg?

2005 Black Rubicon - OME 933/942 - 4" Bilstein 5100 (canister up) - JKS Adj Track Bars Front/Rear - JKS Quicker Discos - 285/75/16

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your money will go farther in College Station.
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post #5 of 68 Old 12-02-2008, 03:03 PM
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Any chance you can put a scan tool on it and see how the fuel trims and O2 sensor readings look? Are you using the factory GM computer to run it all? If so, is it the one that was on the engine originally or did you buy them separately?

2006 Rubicon, 2" spring spacers on stock tires (for now)
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post #6 of 68 Old 12-02-2008, 03:16 PM Thread Starter
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i was running between 70 and 80 on the highway, im going to try 65mph this time. i just filled it up full last time and this time at the same station. all i have is a code reader, its not throughing any codes, i ran 89 octane this time, and i filed it up with 87. i had wait4me performance tune the computer, Jesse, the owner said with his tune i would get better milage, but it isnt looking like it.

i had all the vats, rear O2's, cats, egr, evap, air syl. and all that stuff removed,
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post #7 of 68 Old 12-02-2008, 03:16 PM Thread Starter
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computer came with the motor, 78k on it,
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post #8 of 68 Old 12-02-2008, 03:49 PM
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Hmm ok I was thinking that maybe the tune wasn't right for the engine or something, but if you had Jesse tune it I'm sure it's right. I dunno what to tell ya. You sure that the mileage that's being recorded is correct? Everything is set up right to compensate for the gears and tire size?

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post #9 of 68 Old 12-02-2008, 03:56 PM Thread Starter
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i have drove on the highway comparing my miles to the mile markers, it is dead on for 9 miles or so then i take the exit. it is an autometer fully programmable speedo, so i set it to the highway markers. as long as those are fairly accurate over a 2 mile span im all right.

i would not say that because Jesse tuned it "im sure its right"

he is VERY vague when you talk to him on the phone, he doesnt remember you calling 10 minutes before let alone tuning your computer, he cant or wont tell you what he did to your computer, he doesnt get into rather he set it up like you wanted or not. he is one of the most unproffesional people ive delt with in reguards to leting you know that what you wanted done got done. i for one wouldnt recommend him, but that is me. i have first hand experience of this. His favorite answer is "well if that is what you asked for than im sure i did it"
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post #10 of 68 Old 12-02-2008, 05:59 PM
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I have the same combo, 5.3, 4L60, atlas, 456 gears, and 35" tires. I'm pulling around 20mpg.
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post #11 of 68 Old 12-02-2008, 06:44 PM Thread Starter
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who tuned your computer?
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post #12 of 68 Old 12-02-2008, 06:53 PM
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Take it to another tuner,you should be able to get 20 without even trying!
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post #13 of 68 Old 12-02-2008, 07:01 PM
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mpg

SHould get around 20 mpg
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post #14 of 68 Old 12-02-2008, 07:03 PM
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Call up justin at blackbear. He will get you setup with a tune done to your liking for that 5.3!

98 TJ, 2.5L.

97 GMC Yukon Z-71, soon to be a 355 horse 350.
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post #15 of 68 Old 12-02-2008, 07:54 PM Thread Starter
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i am only going for a local tune, that way when and if im not happy with it i can tell the guy, im not sending it out mailorder anymore
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