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New 4.56 gears on 285/70/17s, do I need a ECU update?

Discussion in 'Performance and Tuning' started by trianimal, Jul 10, 2011.

  1. Jul 10, 2011 at 8:51 AM
    #1
    trianimal

    trianimal [OP] Certified

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    Hey y'all, I'm calling on the collective brain-trust to assist me. My question is after installing the new gears should I try to re-flash the ECU? My speedometer and tachometer read 2200 rpm @ 60 mph and the shift points during hard acceleration rev up to about 5500 rpm. So, is this normal after re-gearing or should I continue to pursue other options?

    Gracias Muchacos
     
  2. Jul 10, 2011 at 9:00 AM
    #2
    trianimal

    trianimal [OP] Certified

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    07 TRD OR BSP DC 4x4
    TRD Supercharger, URD UCONN EMS, URD 2.85 pulley, URD 7th Injector, DTLT Headers, URD Y-Pipe, URD 02 Sensor, Walbro 255 fuel pump, TRD cat-back exhaust, TRD CAI, Donahoe Racing (pre-Icon) 2.5" adj. front & rear resi shocks, All-Pro Offroad 3" rear leafs, All-Pro Offroad U-bolt flip kit, All Pro-Offroad Aluminum Skid Plate, Light Racing UCAs, Tom Woods 1-piece driveshaft, Shrockworks sliders, Avid light bar w/o lower tubes and a pair of Rigid Industries Dually LED Driving lights, Toytec diff drop, Color matched grille, Diaz Devil Horns, Redline hood struts, EZ Down tailgate, Undercover bed cover, 750 watts of sound (JVC, Morrel, Rockford-Fosgate & Infinity), BHLM w/ PIAA 4000K, FLM w/PIAA 4000K
    Anyone?
     
  3. Jul 10, 2011 at 9:06 AM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    FlimFlubberJAM
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    4.10 gears, sliders, and lots of buttons.
    Give it more than 10 mins for people to see. And dont make double threads. FWIW, It doesnt sound normal, and you may want to check into getting the tranny calibrated.
     
  4. Jul 10, 2011 at 9:08 AM
    #4
    trianimal

    trianimal [OP] Certified

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    TRD Supercharger, URD UCONN EMS, URD 2.85 pulley, URD 7th Injector, DTLT Headers, URD Y-Pipe, URD 02 Sensor, Walbro 255 fuel pump, TRD cat-back exhaust, TRD CAI, Donahoe Racing (pre-Icon) 2.5" adj. front & rear resi shocks, All-Pro Offroad 3" rear leafs, All-Pro Offroad U-bolt flip kit, All Pro-Offroad Aluminum Skid Plate, Light Racing UCAs, Tom Woods 1-piece driveshaft, Shrockworks sliders, Avid light bar w/o lower tubes and a pair of Rigid Industries Dually LED Driving lights, Toytec diff drop, Color matched grille, Diaz Devil Horns, Redline hood struts, EZ Down tailgate, Undercover bed cover, 750 watts of sound (JVC, Morrel, Rockford-Fosgate & Infinity), BHLM w/ PIAA 4000K, FLM w/PIAA 4000K
    how does one go about recalibrating a transmission?
     
  5. Jul 10, 2011 at 9:11 AM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    4.10 gears, sliders, and lots of buttons.
    Not sure. it may be something the dealer has to do.
     
  6. Jul 10, 2011 at 9:14 AM
    #6
    WhatThePho?

    WhatThePho? Greg Graffin 2016

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    The things required to pull bitches
    2200 at 60 seems normal for 4.56. You did come from 3.73

    In technical chat there's a thread for a formula for regear to find your true speed.
     
  7. Jul 10, 2011 at 9:18 AM
    #7
    trianimal

    trianimal [OP] Certified

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    TRD Supercharger, URD UCONN EMS, URD 2.85 pulley, URD 7th Injector, DTLT Headers, URD Y-Pipe, URD 02 Sensor, Walbro 255 fuel pump, TRD cat-back exhaust, TRD CAI, Donahoe Racing (pre-Icon) 2.5" adj. front & rear resi shocks, All-Pro Offroad 3" rear leafs, All-Pro Offroad U-bolt flip kit, All Pro-Offroad Aluminum Skid Plate, Light Racing UCAs, Tom Woods 1-piece driveshaft, Shrockworks sliders, Avid light bar w/o lower tubes and a pair of Rigid Industries Dually LED Driving lights, Toytec diff drop, Color matched grille, Diaz Devil Horns, Redline hood struts, EZ Down tailgate, Undercover bed cover, 750 watts of sound (JVC, Morrel, Rockford-Fosgate & Infinity), BHLM w/ PIAA 4000K, FLM w/PIAA 4000K
    Yes sir, I read that thread and I'm not asking about a true speed recalibration. My question relates to the rpm:mph & acceleration shift points.
     
  8. Jul 10, 2011 at 9:21 AM
    #8
    WhatThePho?

    WhatThePho? Greg Graffin 2016

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    The things required to pull bitches
    Well 2200 at 60 is normal. I recently regeared to 4.88 and am at 2200-2300 at 60 and 3000 at 80.

    Tranny wise I have no clue. Maybe someone with a second gen can help us.
     
  9. Jul 10, 2011 at 10:23 AM
    #9
    trianimal

    trianimal [OP] Certified

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    07 TRD OR BSP DC 4x4
    TRD Supercharger, URD UCONN EMS, URD 2.85 pulley, URD 7th Injector, DTLT Headers, URD Y-Pipe, URD 02 Sensor, Walbro 255 fuel pump, TRD cat-back exhaust, TRD CAI, Donahoe Racing (pre-Icon) 2.5" adj. front & rear resi shocks, All-Pro Offroad 3" rear leafs, All-Pro Offroad U-bolt flip kit, All Pro-Offroad Aluminum Skid Plate, Light Racing UCAs, Tom Woods 1-piece driveshaft, Shrockworks sliders, Avid light bar w/o lower tubes and a pair of Rigid Industries Dually LED Driving lights, Toytec diff drop, Color matched grille, Diaz Devil Horns, Redline hood struts, EZ Down tailgate, Undercover bed cover, 750 watts of sound (JVC, Morrel, Rockford-Fosgate & Infinity), BHLM w/ PIAA 4000K, FLM w/PIAA 4000K
    Let's not compare the two as the mechanical differences and variances are many.

    most humbly
     
  10. Jul 10, 2011 at 10:32 AM
    #10
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    4.10 gears, sliders, and lots of buttons.
    Did you have any shifting issues?
     
  11. Jul 10, 2011 at 12:50 PM
    #11
    WhatThePho?

    WhatThePho? Greg Graffin 2016

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    The things required to pull bitches
    Not really. Depends on how hard I push the pedel. I usually have it shift before 2200-2300. It's auto btw. If I'm going onto the freeway At 3/4 throttle I'll go out to 45-5000
     
  12. Jul 10, 2011 at 7:06 PM
    #12
    trianimal

    trianimal [OP] Certified

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    Messages:
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    Gender:
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    Vehicle:
    07 TRD OR BSP DC 4x4
    TRD Supercharger, URD UCONN EMS, URD 2.85 pulley, URD 7th Injector, DTLT Headers, URD Y-Pipe, URD 02 Sensor, Walbro 255 fuel pump, TRD cat-back exhaust, TRD CAI, Donahoe Racing (pre-Icon) 2.5" adj. front & rear resi shocks, All-Pro Offroad 3" rear leafs, All-Pro Offroad U-bolt flip kit, All Pro-Offroad Aluminum Skid Plate, Light Racing UCAs, Tom Woods 1-piece driveshaft, Shrockworks sliders, Avid light bar w/o lower tubes and a pair of Rigid Industries Dually LED Driving lights, Toytec diff drop, Color matched grille, Diaz Devil Horns, Redline hood struts, EZ Down tailgate, Undercover bed cover, 750 watts of sound (JVC, Morrel, Rockford-Fosgate & Infinity), BHLM w/ PIAA 4000K, FLM w/PIAA 4000K
    So, not to be thread-jacked...does anyone have any experience with a ECU re-flash after re-gearing their truck?

    experience-based and constructive replies would be greatly appreciated.
     
  13. Jul 10, 2011 at 8:30 PM
    #13
    WhatThePho?

    WhatThePho? Greg Graffin 2016

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    The things required to pull bitches
    Pm sandman427. He's running pretty much the same set up you have. 4.56 and I think 285
     
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