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how to use my thunderMax to its fullest capacity

Discussion in 'Motorcycle Tech Talk' started by tinsnips, Sep 15, 2013.

  1. tinsnips

    tinsnips Active Member

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    completely clueless on checking my thundermax settings 08 ultra 551 cams V&H true duals K&N filter 35mpg!! bike runs a little cooler than with the SERT but for 9 crispies was expecting more I have a hard enough time turning on the computer let alone checking downloads. HELP
    tinsnips, Sep 15, 2013
    #1
  3. cowboy

    cowboy Moderator Staff Member

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    this one's for ole cardboard , he most likely has videos to show you how to's
    cowboy, Sep 15, 2013
    #2
  4. chucktx

    chucktx Moderator Staff Member

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    hey cardboard!!!!!!!
    chucktx, Sep 16, 2013
    #3
  5. FLHTbiker

    FLHTbiker Moderator Staff Member

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    No Cardboard :rolleyes:
    FLHTbiker, Sep 16, 2013
    #4
  6. cardboard

    cardboard Well-Known Member

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    Yer true duals in hurting your low end performance .
    If you was interested in fuel milage you should I'd left it stock.
    With the cams yer probably twisting the throttle harder too.
    What's your air pressure on yer tires ?
    How much weight you hauling.
    Change yer plugs
    Put some autolite 4164 plugs in
    Hope you have auto tune checked.
    Your TM program has tech support in it
    Run the file and send it to them or make a bike show & see Thunder- Heart.
    cardboard, Sep 17, 2013
    #5
  7. hotroadking

    hotroadking Super Moderator Staff Member

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    Nonsense, you can get great fuel mileage with EFI bikes that are properly tuned even hot rods, should be able to get mid to high 40's with reasonable riding, now if you twist the wick constantly you'll see lower MPG.

    True duals only hurt power when the tune isn't right, you can get power but you have to know what you are doing the combination of pipes, cams, and other bits on an EFI bike can make great power or be a PIA to tune...

    It's cooler because at 30 mpg you're dumping fuel through it and wasting gas.

    I'd check with the zippers people as to how to fix the tune,
    hotroadking, Sep 17, 2013
    #6
    FLHTbiker likes this.
  8. cardboard

    cardboard Well-Known Member

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    More than one Dyno man told me they didn't like true duals when they dynoed. Bike.
    And they are a fan of 2 in 1 pipes. Much easier to tune, better power across the rpm range .
    cardboard, Sep 17, 2013
    #7
  9. hotroadking

    hotroadking Super Moderator Staff Member

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    Yes I've heard that, because duals are a bit trickier to tune but that doesn't mean you can't get them tuned properly and get a better TQ curve,

    2-1s are not all that and a bag of chips...
    hotroadking, Sep 17, 2013
    #8
  10. cardboard

    cardboard Well-Known Member

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    2 in 1 tune easier, produce better power across the board and hve exceptional low end power .

    One of the bet selling pipes is D&D fatcats, but they are loud.
    Supertrapp produces great power but ain't as loud,
    cardboard, Sep 17, 2013
    #9
  11. hotroadking

    hotroadking Super Moderator Staff Member

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    Not true. A good tuner can make great power with duals.
    hotroadking, Sep 17, 2013
    #10
  12. cowboy

    cowboy Moderator Staff Member

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    YES they can , My E glide had duals & My indy could tune it on his dyno Did a darn good job lasted till I swapped to a carb so about 4-5- years good riding got 45-47 mpg wot got about 35
    cowboy, Sep 17, 2013
    #11
  13. FLHTbiker

    FLHTbiker Moderator Staff Member

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    Maddog and I get great mileage with our EFI that are tuned properly. We can get 44-48 MPG. If we push it hard its going to be less just stands to reason. A good tuner can tune true duals to run great with great torque and HP.
    FLHTbiker, Sep 17, 2013
    #12
  14. baggerpaul

    baggerpaul Well-Known Member

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    some one did not run the fuel learn off sets !also set your cruise and idle areas to 14.3 air and fuel ratios they are set from the factory at 13.2. kinda rich for cruise area
    baggerpaul, Sep 18, 2013
    #13
  15. hotroadking

    hotroadking Super Moderator Staff Member

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    CB heres proof, this is an 07, punched out to 106 with SNS kit, 57MM TB, 4.3 injectors, SNS 585 cams and running Vance and Hines True Dual Headers with Supertrapp mufflers (disk type), tuned by Doc using TTS

    Notice the initial run was much lower with the big dip.

    With patience and proper tuning this bike has a massive TQ curve that
    is smooth as it is wide, no 2-1 dip, very good power.

    Attached Files:

    hotroadking, Sep 18, 2013
    #14
  16. baggerpaul

    baggerpaul Well-Known Member

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    nice run like those 585 g I run the sheet out of them in the 98
    baggerpaul, Sep 18, 2013
    #15
  17. hotroadking

    hotroadking Super Moderator Staff Member

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    YEah had them in my 106 without the head work etc, worked great
    hotroadking, Sep 18, 2013
    #16
  18. cardboard

    cardboard Well-Known Member

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    If you build a bike, it's always gonna run across the board better than stock.
    Thought we was talking about a near stock bike.

    Had a master tech at a HD dealership put a 120r in a bike. Tuned it with true duals.
    Customer ran it for a while.
    Came back. They put a 2in1 pipe on the same bike and tuned it. Made better power with the 2 in 1 fatcat.
    cardboard, Sep 29, 2013
    #17
  19. hotroadking

    hotroadking Super Moderator Staff Member

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    Fatcats are good, it's easier for some tuners to
    do a 2-1 they have a lot of experience, it takes
    a lot more work to do duals,

    Rienharts are known to make good power
    the headers are better, the supertrapp tuneable
    disk mufflers make the duals more tuneable.

    Comes down to the parts combined and
    the tuners ability...

    Either way is good...
    hotroadking, Sep 29, 2013
    #18

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