1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

ECU chip that can increase power?

Discussion in '1st Gen Tundras (2000-2006)' started by stevechumo, Dec 7, 2019.

  1. Dec 12, 2019 at 7:06 AM
    #61
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    I practically got 50% off on mine :D
    I did mine because my diff broke and they were much cheaper than Toyota gears and I wanted power back.
     
  2. Dec 12, 2019 at 7:12 AM
    #62
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    From studies, the chart is not exact science. It does provide some basic understanding. I believe this chart is based on 65 mph vehicle speed. Its along the similar vein as @speedtre chart above except on his chart he shows 5 speeds transmission. Mine is a 3plus OD for total of 4 speed. I’ll double check my RPM at 65mph but IIRC it is way left of the ‘optimal’ (left of the blue coloring). I feel dirty now.

    upload_2019-12-12_10-3-28.jpg
     
    because_wumbo-truck and revtune like this.
  3. Dec 12, 2019 at 7:35 AM
    #63
    HappyGilmore

    HappyGilmore Ex 1st Gen Member

    Joined:
    Dec 27, 2018
    Member:
    #23558
    Messages:
    913
    Gender:
    Male
    First Name:
    Trent
    Lakewood CA
    Vehicle:
    2018 White Limited TRD 4x4
    Good points above. I guess I will add that my Tundra was 2wd. If it was 4wd, I might not have re-geared due to cost. And I even did the labor myself.
     
    Darkness likes this.
  4. Dec 15, 2019 at 1:04 AM
    #64
    because_wumbo-truck

    because_wumbo-truck TTC#036 & 1st Degenerate

    Joined:
    Aug 19, 2018
    Member:
    #18314
    Messages:
    3,110
    First Name:
    Jon
    Houston, Texas
    Vehicle:
    2006 AC Tundra Limited 4x4 v8
    flowmaster 40, DDI injectors, sliders, bumper
    Did you go 4.30 or 4.56?
    I think my truck has 4.10 and with the 295s it's not bad but I'm sure it could be better. Especially if I go 35s some day
     
  5. Dec 15, 2019 at 5:12 AM
    #65
    Rex Kramer

    Rex Kramer Vinyl Spinner

    Joined:
    Apr 9, 2017
    Member:
    #7181
    Messages:
    6,620
    Gender:
    Male
    Georgia
    Vehicle:
    2002 4.7L RCLB 4X4 2007 5.7L RCSB 4X2
    I believe the numbers shown in that power band/RPM band to tire size/gear size chart are in whatever gear is 1:1 @65 mph with the O.D. turned off. I re-geared by going to smaller tires... Example: on my 2007 with a 4:30 and short 31" tires the 5.7 is turning 3150 rpms @ 65 mph in S-4 / 1:1, that's equivalent to a 4:60 gear give or take. If I ever run much taller than stock tires on my 2002, I would want to re-gear to something stronger than the 3:91 it came with.
     
    Last edited: Dec 15, 2019
  6. Dec 15, 2019 at 5:26 AM
    #66
    revtune

    revtune New Member

    Joined:
    Mar 5, 2019
    Member:
    #27132
    Messages:
    610
    Gender:
    Male
    First Name:
    Dane
    Houston Texas
    Vehicle:
    2006 Tundra 4.7 AC 2wd
    2006 Tundra: Stock air intake 3 inch catback Magnaflow 13742 2.5 inch front lift 1.5 inch rear blocks 2014 sr5 4Runner wheels (17x7) 1.5 inch hub centric wheel spacers p285/70/17 Nitto Terra Grappler G2 Weathertech floor liners

    I believe you have 3.92 or 3.91. All v8 tundras from 05-06 regardless of cab have that ratio except for a few oddball 3.62 ratios. I would suggest not even considering 4.30. Go 4.56 and don’t look back:thumbsup:
     
  7. Dec 15, 2019 at 8:21 AM
    #67
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    Been running 4.56 since 2011. If I went 35s I would go 4.88s but 4.56 would do fine. On paper 4.56 and 35s are as close as you can get to stock hearing but that doesn't work in real life because it doesn't account for added weight.

    My RPM don't match that graph, at 65 mph I am around 2300 RPM. Maybe would hit 3k if I turned overdrive off per Rex's note.
     
    Last edited: Dec 15, 2019
    revtune likes this.
  8. Dec 15, 2019 at 9:15 AM
    #68
    revtune

    revtune New Member

    Joined:
    Mar 5, 2019
    Member:
    #27132
    Messages:
    610
    Gender:
    Male
    First Name:
    Dane
    Houston Texas
    Vehicle:
    2006 Tundra 4.7 AC 2wd
    2006 Tundra: Stock air intake 3 inch catback Magnaflow 13742 2.5 inch front lift 1.5 inch rear blocks 2014 sr5 4Runner wheels (17x7) 1.5 inch hub centric wheel spacers p285/70/17 Nitto Terra Grappler G2 Weathertech floor liners

    Great point, I think people tend to follow the graphs as scripture. Like you’ve said before, “on paper” it looks good, but in real world scenarios it’s only adequate or even disappointing. Because of the cost of a regear, it doesn’t make a lot of sense to only go up 2 notches. On the vvti access cabs 295’s don’t even feel too bad but it’d be a heck of a lot more fun with 4.56.
     
  9. Dec 15, 2019 at 9:24 AM
    #69
    revtune

    revtune New Member

    Joined:
    Mar 5, 2019
    Member:
    #27132
    Messages:
    610
    Gender:
    Male
    First Name:
    Dane
    Houston Texas
    Vehicle:
    2006 Tundra 4.7 AC 2wd
    2006 Tundra: Stock air intake 3 inch catback Magnaflow 13742 2.5 inch front lift 1.5 inch rear blocks 2014 sr5 4Runner wheels (17x7) 1.5 inch hub centric wheel spacers p285/70/17 Nitto Terra Grappler G2 Weathertech floor liners
    As cool as 35’s look on these trucks. It just seems like a never ending battle to fit them. Lift wise you’d need long travel or a combination spindle/suspension lift of 6 inches or more? Regearing would become top priority. Better start stocking up on ramen noodles and hot dogs:D
     
  10. Dec 15, 2019 at 11:08 AM
    #70
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Confirmed my data today.

    1950 RPMs at 65mph (actual using 8% increase due to 285/75/r16)

    2250 RPMs at 77mph (actual using 8% increase due to 285/75)

    Truck has stock 3.91 gears.
     
  11. Dec 15, 2019 at 11:29 AM
    #71
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    So this means at 65mph on the chart (not real life just a gauge) I’m effective 2.94 gearing on ‘33’s’. Yeah baby!
     
  12. Dec 15, 2019 at 2:08 PM
    #72
    because_wumbo-truck

    because_wumbo-truck TTC#036 & 1st Degenerate

    Joined:
    Aug 19, 2018
    Member:
    #18314
    Messages:
    3,110
    First Name:
    Jon
    Houston, Texas
    Vehicle:
    2006 AC Tundra Limited 4x4 v8
    flowmaster 40, DDI injectors, sliders, bumper
    That's what I'm thinking
     
  13. Dec 15, 2019 at 2:16 PM
    #73
    revtune

    revtune New Member

    Joined:
    Mar 5, 2019
    Member:
    #27132
    Messages:
    610
    Gender:
    Male
    First Name:
    Dane
    Houston Texas
    Vehicle:
    2006 Tundra 4.7 AC 2wd
    2006 Tundra: Stock air intake 3 inch catback Magnaflow 13742 2.5 inch front lift 1.5 inch rear blocks 2014 sr5 4Runner wheels (17x7) 1.5 inch hub centric wheel spacers p285/70/17 Nitto Terra Grappler G2 Weathertech floor liners

    https://www.tacomaworld.com/tirecalc?tires=245-70r16-285-75r16

    I think the SR5 tundra access cab v8’s were calibrated for 245/70/16 tires. Check out the link above. You might actually be getting a little bit better mpg than you think.
     
  14. Dec 15, 2019 at 2:23 PM
    #74
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Thanks for this. So looks like I under calculated my MPG by 2%.

    Now off to the MPG thread to correct everything. Hahahahaa. Just kidding.
     
    TX-TRD1stGEN and revtune[QUOTED] like this.
  15. Dec 15, 2019 at 4:09 PM
    #75
    speedtre

    speedtre New Member

    Joined:
    Jan 20, 2019
    Member:
    #24808
    Messages:
    1,696
    Inland Northwest
    Vehicle:
    2006 BSM Toyota Tundra DC TRD 4x4
  16. Dec 15, 2019 at 4:19 PM
    #76
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Forgot to turn off the O.D. today!
    Need to re-calculate.
     
  17. Dec 16, 2019 at 2:13 PM
    #77
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    With O.D. off

    True 65 mph at 2800 rpms puts my 285/75/r16s in the chart sweet spot! Yay!

    The truck is theoretically correct and balanced between power and fuel optimization. Its Zen!
     
    speedtre, revtune and Rex Kramer like this.
  18. Dec 16, 2019 at 5:06 PM
    #78
    revtune

    revtune New Member

    Joined:
    Mar 5, 2019
    Member:
    #27132
    Messages:
    610
    Gender:
    Male
    First Name:
    Dane
    Houston Texas
    Vehicle:
    2006 Tundra 4.7 AC 2wd
    2006 Tundra: Stock air intake 3 inch catback Magnaflow 13742 2.5 inch front lift 1.5 inch rear blocks 2014 sr5 4Runner wheels (17x7) 1.5 inch hub centric wheel spacers p285/70/17 Nitto Terra Grappler G2 Weathertech floor liners

    Cool. So if you were running the standard equipped 245/70/16 tires you’d be right around 58-59mph @ 1950rpm and 70mph @ 2250.

    Everybody should check out this very simple Spicer calculator; https://spicerparts.com/calculators/transmission-ratio-rpm-calculator

    I tried some of the other ones like grimmejeep or whatever and it was a little over my head.

    A340 (4 speed) final drive = .705
    A750 (5 speed) final drive = .716
     
    because_wumbo-truck likes this.
  19. Dec 16, 2019 at 5:20 PM
    #79
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Something like that. You’ve reversed the calculation method, but pretty close to your numbers. I was reminded how many RPM’s jump when going out of O.D. when doing so today.

    I went through the whole re-gear dilemma last year and concluded not worth it. I do think the 12 holes injectors added some spice and are a way to bump the engine/transmission performance up a hair versus a full double diff re-gear. Value based in thinking here. Larger than my 285’s probs need a re-gear but those won’t ever happen.
     
    revtune[QUOTED] likes this.
  20. Dec 16, 2019 at 5:21 PM
    #80
    Hbjeff

    Hbjeff New Member

    Joined:
    Jan 20, 2019
    Member:
    #24845
    Messages:
    4,897
    Gender:
    Male
    Huntington Beach
    Vehicle:
    2010 DC 5.7 2wd
    Trd sways, bullydog, magnaflow, sumo springs
    I’ve always wondered. Do you think toyota actually changes the programming for 245/70/16 vs 265/70/16 equipped models?
     
  21. Dec 16, 2019 at 5:32 PM
    #81
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Keep in mind that quote of mine, that you quoted, was mal-information as I did not have my O.D. off.

    Read post #76 where I corrected myself.
     
    revtune[QUOTED] likes this.
  22. Dec 16, 2019 at 5:41 PM
    #82
    revtune

    revtune New Member

    Joined:
    Mar 5, 2019
    Member:
    #27132
    Messages:
    610
    Gender:
    Male
    First Name:
    Dane
    Houston Texas
    Vehicle:
    2006 Tundra 4.7 AC 2wd
    2006 Tundra: Stock air intake 3 inch catback Magnaflow 13742 2.5 inch front lift 1.5 inch rear blocks 2014 sr5 4Runner wheels (17x7) 1.5 inch hub centric wheel spacers p285/70/17 Nitto Terra Grappler G2 Weathertech floor liners

     
  23. Dec 16, 2019 at 5:46 PM
    #83
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

    Joined:
    Apr 29, 2018
    Member:
    #14878
    Messages:
    15,007
    Gender:
    Male
    First Name:
    Fred
    ‘Somewhere’... a State of Mind
    Vehicle:
    2002 Tundra SR5 4WD 4.7L AC Silver Metallica
    Hand Protectors
    Hahahahahaa!!!
     

Products Discussed in

To Top