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Blackbear Re-tune

Discussion in 'Programmers & Tuning' started by reggiecab2000, Mar 2, 2013.

  1. reggiecab2000

    reggiecab2000 Rockstar 4 Years 500 Posts

    Headed up to San Antonio in a bit to get my truck retuned tomorrow. Going to give the 93 octane tune a try and adjust some shifting points as well. I will post results on here over the next few weeks with the results of the new tune!
    Currently right now with city driving I fill up 26 gallons about every 340-360 miles (around 13.2-13.8 mpg), so hopefully Ill see those numbers go up a little bit...
     
  2. SurrealOne

    SurrealOne Former Member ROTM Winner 1000 Posts

    Yikes. I wouldn't want to spend the extra cash on 93! I'm pulling 13.8 - 14.3mpg combined as of late ... on 87 octane. That's on the winter mix and with me doing 80ish miles of my 475-485 mile range (on 34 gallons) laden with material for storage.

    I am perplexed at my 4WD V8 w/ efans, shorter gears, and likely more weight (due to bigger tires, a matched full-size spare, a winch, second battery, 225 sq. ft. of sound deadening, and a truck box full of things like jacks, stands, winching gear, etc.) getting better mpg than a 2WD V6. Do you do a lot of city driving or something? My habits are about 50/50 city/hwy right now.
     
  3. reggiecab2000

    reggiecab2000 Rockstar 4 Years 500 Posts

    Actually. Up until I just moved this week, my drive is usually a 7 mile straight shot to work and back down the highway. No stops. And a 3 mile stretch with no stop signs to school and back (45 mph), of course wandering the university parking lot for a space doesn't help gas.
    But yes I have always thought it weird that my v6 in fact is proven to get less mileage than a v8 somehow. From numerous mechanics, google, research, the only things I seem to see is that having a v8 makes the engine not work as hard to get the truck moving. The 4.3 has NEVER been a sufficient engine for a full size truck, and there is practically nothing that has changed since the year 2000. The 2012 4.3 I believe is still rated at the exact same horsepower and torque as mine. (200 HP,240 ft/lb) they don't improve my engine like they do the v8, as you see every year the v8 has more horsepower, more torque, more mpg, etc. not so in the 4.3 don't know why...
    But before I ever even out the lift, bigger tires, and regear in my truck. I still never saw many days over 15 mpg.
    After my move this week I have nothing but stop lights to school and work so I presume mpg will only get worse with time.
    I'm always pissed when I pull a fat dually into a bay to work on and know he has twice the horsepower and more than twice the torque of my truck, and STILL gets better mpg than me!
    Mpg just isn't friendly on my truck....
    Except for the one time last April I drove to Dallas for tough mudder, AND to get my blackbear tune, I drove straight from Corpus Christi to Dallas in cruise control at 62 mph, and I calculated 18 mpg. And obviously that was with the wind too. That was the highlight of my trucks life! Lol
     
  4. TRPLXL2

    TRPLXL2 Epic Member 5+ Years 1000 Posts Platinum Contributor

    I would say your trucks not running right or something??? I have an 05' 2500HD 6.0 4.10 gears, 31" 10 ply tires, and I have stayed right at 14mpg since it was new, now has 36,000 miles on it. I also run 93 because of my HP tune I have on it, I think the truck runs better on 93.
     
  5. reggiecab2000

    reggiecab2000 Rockstar 4 Years 500 Posts

    got the retune from justin today!


    after a little dilemma with my truck!(will post on this later)


    he tweaked my 1-2 shift to be a little firmer which he agreed seemed very slushy for some reason, but the corvette servo helped the 2-3 shift greatly... also I am now running the 93 octane tune. Will be another few weeks or so before I can start to even draw conclusions about mpg gains. But as of now I only put my 160 mile drive from san antonio back to corpus christi on it, which of course is INTO the wind...

    ALSO justin notified me that my distributor is -12 degrees off...
    Ill need to go get it aligned properly by someone with a scan tool, he was reading some random misses at idle on my truck and found this...
    He says it is such a small increment off that, although it is possible a 5 minute job, you cant be sure its right on spot without the use of a scanner.

    it SEEMS to run "smoother" but I might be thinking optimistically here, Hopefully the long run will give me more determinate answers to this.
     
  6. vncj96

    vncj96 Epic Member 5+ Years 1000 Posts

    our 98 blazer 4 dr 4x4 never did any better then a V8 as far as MPG, maybe once in a GREAT while it got 20mpg on a long run but that was never more then 60mph, otherwise it was a solid 16 since the day we bought it to the day it rolled 200k, they are just not great MPG engines.
     
  7. Pikey

    Pikey Moderator Staff Member 3 Years ROTM Winner 1000 Posts

    I know exactly what you are saying. I had an 1998 GMC somoma 2wd with a 4 cylinder. My sister bought a 1998 sonoma 4x4 with a 6 cylinder. She consistently got 3 miles per gallon better than I did. My little 4 cylinder had to work really hard compared to her 6 cylinder.
     
  8. Sierraowner5.3

    Sierraowner5.3 Rockstar 3 Years 1000 Posts

    its funny, my dad has a 98 blazer 4x4 with the 4.3 and he gets 20+ regularly.

    Alex
     
  9. Pikey

    Pikey Moderator Staff Member 3 Years ROTM Winner 1000 Posts

    My oldest sister also bought a 98 blazer 4x4 the same year. She also got better MPG than my 4 cylinder sonoma. I am sure that the gearing of my sonoma was the issue. It came from the factory with a 4:10. They had yo put that gear in it or it would have never moved out of its own way.
     

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