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Instructions for custom tuning the truck with HPTuners.

Discussion in 'Performance and Tuning' started by ViktorG, Jul 9, 2020.

  1. Apr 13, 2021 at 8:42 AM
    #31
    tnine

    tnine New Member

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    Ok, new guy follow-up question...

    I'm a software engineer, and pretty savvy with software. I've done some firmware development as well, but tuning my vehicle is new territory for me. I'm not quite clear on which hardware I need to purchase to do my tuning. Which product would I purchase, the MPVI2 or the Pro? Is there any good "getting started" documentation I could follow?

    https://www.hptuners.com/products/

    Thanks in advance!
     
    ViktorG[OP] likes this.
  2. Apr 13, 2021 at 10:10 AM
    #32
    19crewmaxTRD

    19crewmaxTRD Tundra Enthusiast

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    Wouldn't this essentially make tow/haul mode useless because you’d be switching between identical maps?
     
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  3. Apr 13, 2021 at 10:13 AM
    #33
    tnine

    tnine New Member

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    Yes, you're correct. However, I'll likely make tow/haul tables the default, and then modify the tow/haul tables to change the shift points to accommodate for the larger tires as well. I intend to only modify one table at a time so that I can ensure the changes I'm making have the desired outcome.
     
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  4. Apr 13, 2021 at 10:21 AM
    #34
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    Yes, but I believe that's what he wants
     
  5. Apr 13, 2021 at 10:23 AM
    #35
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    You need the MPVI2 ($300) and 4 credits ($200)
    There is no documentation included, you can read up on the Toyota section of hptuners forum for some tips on where to start
     
  6. Apr 19, 2021 at 2:42 PM
    #36
    tnine

    tnine New Member

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    So I've received my HP Tuner, and I'm attempting to download my factory tune. I receive the two attached error dialogs.. is this normal?

    https://www.dropbox.com/s/ps9klm34tktcakj/Annotation 2021-04-19 151602-2.png
    https://www.dropbox.com/s/pscrx51hj7u9aup/Annotation 2021-04-19 151602.png?dl=0


    Second, I'm attempting to use the Excel spreadsheet referenced here to re-calculate my shift points for 34.5" tires.

    https://forum.hptuners.com/showthread.php?81934-Toyota-Repository&p=598929&viewfull=1#post598929

    However, it's not clear to me where I transpose these values into my shift scheduling since the units don't match. Any ideas on how to transpose these values, or is this spreadsheet not correct?

    https://www.dropbox.com/s/96pfinjoloomoro/VCM Editor.png?dl=0

    Thanks for any help you can provide!
    Todd
     
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  7. Apr 19, 2021 at 3:40 PM
    #37
    armyoffoo

    armyoffoo Member

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    That first screen error is the default if it's unable to read from the ECM, it's downloading a default Tundra tune from HP tuners that you are looking at. Don't write that tune to your truck, don't write until you get a successful download to edit. Try downloading the latest stable version of software, not the beta, then try reading again.
     
  8. Apr 19, 2021 at 8:24 PM
    #38
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    The first message tells you that the stock ECU is unreadable (none of the Tundra ECUs are readable) and that HPtuners will give you a stock file for your ECU.
    This is normal and everyone gets this message.
    The second one I haven't seen before but it pretty much says that the calibration in your ECU is outdated and HPtuners will give you a stock file with the most up to date calibration.
    Looks totally normal to me as well.

    As far as adjusting for bigger tires, you don't want to be doing it in the shift tables. Those have to do with shift RPM under different load levels.
    You want to input the tire size. There is a small table under the transmission somewhere (I don't have my tuning laptop with me to take a look).
    That table says something like "Tire diameter XXX mm". of "Tire circumference" or something along those lines.
    You need to calculate that particular measurement of your tire ant input it into that table.
     
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  9. Apr 20, 2021 at 10:54 AM
    #39
    tnine

    tnine New Member

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  10. Apr 20, 2021 at 11:14 AM
    #40
    armyoffoo

    armyoffoo Member

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    I had a different experience with my truck...I only got this message when I used a beta version of the software, installing the stable version allowed me to connect to the vehicle and save to a new file for editing.
     
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  11. Apr 20, 2021 at 12:00 PM
    #41
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    That's fair. I have gotten that message with both mine and my friend's trucks. After doing some reading, I found information that stated that the Tundra ECU cannot be read with HPtuners, so they just look at the calibration ID that is in the ECU and provide you a matching calibration .hpt file.
    Maybe I'm wrong, idk :notsure:
     
  12. Apr 20, 2021 at 12:02 PM
    #42
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    It should change the shift pattern to compensate for the larger tires (in theory, I have stock sized tires so I have not adjusted that value).
    It will NOT do anything to the speedometer, the speedo and odometer cannot be calibrated with HPtuners to account for a different tire size.
     
  13. Apr 20, 2021 at 12:23 PM
    #43
    tnine

    tnine New Member

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    To be clear, I'm using the stable version of the VCM suite. I've done software long enough to know I don't want to be on the beta version of anything unless it's absolutely necessary! @armyoffoo why do you think I'm using beta software? I re-installed the latest stable just to be sure, and I have the same issue downloading the existing ECM.

    According to my calculations, my tire size of Toyo AT 3 at 295/70R18 is a diameter of 34.3". So 34.3/2 = 17.1 " on my diameter. I don't have my 4 credits yet for programming. I'll buy those and see if it makes any difference downloading the ECM. I didn't want to purchase them until I was sure I could actually upload what I needed. I'll let you know how it goes!
     
  14. Apr 20, 2021 at 12:36 PM
    #44
    armyoffoo

    armyoffoo Member

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    I was trying to help, as I received that same message when I tried using a beta version to connect to mine, and resolved by installing the stable version.
     
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  15. Apr 21, 2021 at 8:37 AM
    #45
    tnine

    tnine New Member

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    @armyoffoo Gotcha! I just wanted to make sure there wasn't something you noticed in my screenshots to make you think it was a beta version that I missed. I haven't re-programmed yet, unfortunately didn't have the time to get to it.

    @ViktorG Since you're a former 'Yota employee. I have an extended warranty on my Tundra. If I re-flash and then have to take it in, will it void my warranty? I know some people just say "load the factory ecu" but since I can't download the exiting ECU, will re-flashing with the default provided by HP Tuners be sufficient to not void my warranty?

    Thanks!
     
  16. Apr 21, 2021 at 8:49 AM
    #46
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    I am a current Toyota employee (shop foreman at a Lexus dealership).
    We cannot tell that your ECU is reflashed by any means available to us since the calibration ID stays the same when you reflash with HPtuners.
     
  17. Apr 22, 2021 at 5:05 AM
    #47
    4firemandan

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    Mwuhahahahahaaaa:devil:

    we have an inside man! lol.
     
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  18. Apr 22, 2021 at 9:19 AM
    #48
    Cruzer

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    @ViktorG you are the man! I so needed this in Moab. I couldn't understand why I couldn't bump it harder.
     
  19. Apr 30, 2021 at 8:43 AM
    #49
    tnine

    tnine New Member

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    So, I finally flashed my truck! Murphy's law, my laptop monitor crapped out right after I downloaded the ECU firmware. Now that I have my replacement, I adjusted the tire size as @ViktorG suggested and it's like driving a new truck! I'm going to drive it for a bit to see how hit handles, I'm assuming it's re-learning my throttle inputs and normalizing them. Thanks for all your help, it's greatly appreciated!
     
  20. May 27, 2021 at 10:37 AM
    #50
    tnine

    tnine New Member

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    @ViktorG I'm attempting to remove the 4Lo throttle limiter outlined in your video here.

    https://www.tundras.com/threads/ins...g-the-truck-with-hptuners.70590/#post-1844802

    However, when I go to Engine-> Airflow, I don't have the tab you show in your video. I'm working on a 2016 SR5 Flex Fluel. I have the latest HPTune software, and the default tune downloaded by HP tune. Any ideas where I can find that throttle angle? See the attached screenshot.

    Thanks again for all your help, I appreciate it!

    [​IMG]
     
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  21. May 27, 2021 at 2:48 PM
    #51
    ViktorG

    ViktorG [OP] Lexus/Toyota Master Tech

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    You need to contact HPTuners support and see if they can add it to your tune.
     
  22. Jun 1, 2021 at 10:11 AM
    #52
    tnine

    tnine New Member

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    This was user error on my part (shocking right?). I had to go to Edit -> View -> Advanced, then re-open my tune file for these options to show up. They're hidden by default. I removed the 4lo throttle limits, limp home mode, and high-speed governor. Thanks for all your help @ViktorG , I really appreciate it!
     
  23. Jun 12, 2021 at 12:26 PM
    #53
    leboreiro

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    Hey guys. Can you help me out figuring out what my MAF voltages should be in the tune when i have aftermarket CAI (k&n with oversized 10.5" filter) and a throttle body vortex spacer?
     
  24. Jun 12, 2021 at 12:52 PM
    #54
    4firemandan

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    Measure the aftermarket cai diameter of the tube at the maf sensor.
    Also measure the stock one ( I know what it is technically, but the point is to confirm they’re the same… or if we’re doing custom intakes or SC size vs n/a we need to know the differences)

    Once you know the size vs stock post it and I’ll show ya how we can modify.

    if it’s the same size, then you’re good.

    while those other things cause extra flow, as long as the maf is still reading the same size cross section, you’re going to get fuel adjusted appropriately.
     
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  25. Jun 21, 2021 at 7:43 PM
    #55
    tnine

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    @ViktorG do you happen to know if there is a mechanism for tuning the cruise control limiter?

    I live in Denver, and I’m experiencing a weird issue with cruise control since I flashed my truck.

    Whenever my truck encounters a steeper hill, it will downshift, but it will never rev past 3,500 RPM. Even at 3,500, it doesn’t “feel” as if it has any power. It’s somewhat tough to describe, but it seems like it’s hitting some governor setting I’m unaware of. I experience this both in Drive and in S. Any ideas where I can look?
     
  26. Jul 14, 2021 at 1:48 PM
    #56
    snivilous

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    Got my HP Tuners, and ordered the Walbro Ti450 fuel pump that Viktor recommended, time to move up in the world! @ViktorG all your HPT tuning videos say private now?
     
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  27. Jul 26, 2021 at 9:45 AM
    #57
    snivilous

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    Been playing with the HP Tuners a bunch the last few days and reading everything possible (albeit there's not much to read). There's only a handful of relevant threads on the HP Tuners forum, but this one is essentially everything needed: https://forum.hptuners.com/showthread.php?81934-Toyota-Repository There's a dude on there, SlowNStock who's super knowledgeable and has been answering all my questions about random stuff I don't understand. Additionally there is an extensive thread on TacomaWorld that's a few hundred pages long, the Tacoma tuning options are similar in most regards to the Tundra; there's so many pages though, I usually just search stuff on the thread and see what I can find.

    Things I've done and noticed so far, I have minimal idea what I'm doing so take it with a grain of salt:

    The HPT module can't read the ECU, it will read the calibration on it and then download that to you, but for some reason HPT (at least the guy I talked to) can't directly supply you with the calibration. I know Victor had other luck, but I was having issue and just emailed them and they said you're SOL unless you send us a data log of trying to talk to the ECU and failing. With that said, it actually worked reading the ECU but I had to hotspot with my phone since my laptop I guess doesn't have enough wifi connection even sitting in the driveway. I've noticed this a few times now, need to hotspot and need a good cell signal, if there's just one or two bars and service is slow then the HPT times out. Once I figured that out, I've had no issues reading or flashing the truck. I had originally flashed the TRD Tune onto my truck, and then had the OV Tune, which I flashed back to (presumably) the TRD Tune which OVT supplied when I got the OVT... so the HPT read my calibration and gave me the TRD Tune. I would think even if I hadn't flashed back to the TRD Tune and still had my OVT on it, it would still have given me the TRD Tune since it's calibration based which the OVT doesn't change the calibration. With that said, if you didn't have the TRD Tune already flashed I guess it'd give you the stock tune? This isn't a huge issue necessarily, since you can download a tune off that above listed thread and then copy all the values to your stock tune (if you wanted the TRD values for instance).

    There are tables for low range and high range low gear/reverse throttle opening limits, as well as AIP failure (limp mode I guess) throttle limits. I over rode all those to max, so should be able to give it full beans whenever. The AIP limp mode throttle limit removed doesn't disable the AIP fault from what I can tell, the truck won't be limited to 10deg TPS angle but you would still have a CEL.

    Raising the rev limiter can be done, I haven't touched it but it seems the TRD tune already had it bumped to 6200 versus I believe 6000rpm. Additionally I raised the speed governor and tested that :D and there is no limiter now. @Downytide I have 5.29s and with the governor increased I was able to go over 100mph easily, food for thought.

    Into more juicy things that haven't been covered already on here, I've been playing with adjusting the AFR which was my main reason to go with the HPT since I wasn't getting anywhere with other tunes I had and was running really rich and even lean in some instances. From what I've read (again my interpretation) there's a handful of ways to control and tune fueling/air:

    MAF: The MAF reads a voltage and based on that voltage assumes so much air is flowing so you can adjust that. If you're cruising and it's running lean or rich, you data log and say okay at 3.1V it's running lean so is moving more air than it thinks it is, so I will increase the lb/min value given so now at 3.1V it's reading the correct amount of air and will thus increase fuel flow accordingly.

    Power Enrichment: Also called PE, says over a certain throttle angle to inject more fuel, and that is based on multiplying the normal stoichiometric afr (which is 14.6). So for instance you floor it, you are over the throttle engagement point and at 6000rpm it has a multiplier of 1.2, so it will effectively inject 1.2x the fuel needed for a 14.6 afr. Everything is based on lambda, which at 1.000 is the stoichiometric afr, I thought this was kind of weird at first but it does make things easy to look at, ie over 1 is lean and under 1 is rich. So if your PE at an rpm is 1.2, then your target lambda is 1/1.2 = 0.833, 0.833 x 14.6 = 12.167 afr. The TRD Tune has this set to engage at 40deg throttle opening, where as the stock tune it looks like is set to 70deg. This means with less throttle the ecu will go into PE and start adding more fuel to richen out past 14.6.

    Component Over Temp: COTS is based on injecting more fuel to keep the catalytic converters from getting too hot, which is based on tables the ecu uses to predict their temperature. More fuel = running cooler. Where this gets fucky, and I believe is what Victor was referring to in his dyno video with the TRD tune being weird, is at WOT for instance, the truck is dumping more fuel because of PE and also dumping more fuel for COTS to try and protect the cats. The two values are combined. I was having issues where at WOT I was running super rich, in the 9s, maybe even 8s at one point, with every tune I ever had. This was because COTS was dumping a shit load of fuel in, so even with changing the PE tables, the COTS enrichment was pushing it even richer. There are fixes to this, currently for testing I just disabled the COTS table altogether so the only fuel strategies happening is the MAF and PE. Because of this, I now have my WOT AFR set in the high 11s, and my wideband is matching what the PE table is shooting for almost perfectly.

    Timing: I have not touched timing at all, but there is a lot of information in that thread about timing strategies. I am not showing any knock retard anywhere, so I can probably increase my timing if I want but that's for another time.

    Transmission: I have not touched any of the transmission stuff, what's funny is I was running the OVT because it would hold gears well, and for whatever reason the TRD shift logic seems to be as good as the OVT and everything else seems smoother and nicer. I remember the TRD tune being ass for shifting, but for whatever reason the TRD tune that HPT gave me by itself is better than all the other tunes (including my first TRD tune?) right out of the box. Interesting. Things like line pressure, shift points, torque converter lock up, etc. can all be modified but I have not done any of that yet, and there's not much information I've seen about it so that might be a trial and error type thing.

    Conclusion--I am very happy with the HP Tuners, they have been quick to respond to my comments and honestly thanks to the SlowNStock user on their forums the whole thing is a game changer, if it wasn't for him there would be hardly any documented knowledge of how to use it and what does what, so huge shout out to him. My truck is running better than ever, and for the first time ever isn't running crazy rich and I'm able to run my Magnusson cold air intake without issue. Still a lot to do, but the TRD Tune provided is a great baseline and I can tweak things in and still drive the truck without worry of something bad happening. My neighbor has access to a dyno at his work, so I'm hoping in the future to get the Tundra on that and really dial the tune in. Hopefully this long novel can answer people's questions, since I had a lot going in and still do but am finally able to have some understanding and know what to tweak. Again, I recommend reading this whole thread if you decide to go this route: https://forum.hptuners.com/showthread.php?81934-Toyota-Repository
     
    TX210Tundra, Wynnded, Vr0ck and 2 others like this.
  28. Jul 26, 2021 at 10:00 AM
    #58
    Downytide

    Downytide New Member

    Joined:
    Sep 3, 2020
    Member:
    #51715
    Messages:
    1,598
    Gender:
    Male
    GTA
    Vehicle:
    Lunar Rock with trail boxes
    still no 2021 support :(
     
  29. Jul 26, 2021 at 10:05 AM
    #59
    snivilous

    snivilous snivspeedshop.com

    Joined:
    Apr 16, 2019
    Member:
    #29192
    Messages:
    3,628
    SW UT
    Vehicle:
    295k Supercharged 2008
    Oh RIP :annoyed: guess you'll be stuck to slightly over the speed limit :rofl:
     
  30. Jul 26, 2021 at 10:17 AM
    #60
    Downytide

    Downytide New Member

    Joined:
    Sep 3, 2020
    Member:
    #51715
    Messages:
    1,598
    Gender:
    Male
    GTA
    Vehicle:
    Lunar Rock with trail boxes
    I only touched the speed limiter when at the 1/4 mile track, so its ok, but still going to jump on the s/c bandwagon for towing needs lol
     
    snivilous likes this.

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