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  1. Tried out map 4 with the jb4 on e30, here are the logs…

    Dang an extra 40 hp???? That’ll put me close to 500 that’s crazy. But at that point when I get my ecu unlocked I’m just gonna pair it with bm3 and do a custom e30 tune with that that’ll definitely get me to 500 whp or so I’ve heard ?

  2. Best tuning platform for tracking?

    Running a JB4 for track use is a horrible idea. You can't control timing or fueling and the trans really starts hating life because you are lying to it the whole time. If you are looking for a custom tune, not just a OTS tune, then find a good tuner and use what they prefer if you haven't...

  3. Best tuning platform for tracking?

    I find ECUTEK to be quite expensive and the ECUTEK dealers want you to do everything with them all together and it usually runs around $1500 to $1800 or more because they want to custom tune and dyno time and won’t do it unless you do all that. I went to a very very prominent tuner store here in...
  4.

    FS: [Price Reduced] HPDE-Prepped 2021 Toyota GR Supra 3.0 - ~7000 miles - $50k (Limited Time)

    As in is it an early '21 model that has the old ECU which is fully unlockable? It is unfortunately not, hence the JB4. I haven't really kept up with things recently, but I didn't think this was that big of a deal anymore with the current options on the market for stuff like BM3? EDIT: I'm not...

  5. SUPRA ULTIMATE B58 JB4 GUIDE AND LOG REVIEW (V1)

    If you download TunerPro, you can also tweak things in the BEF rom files you have. You can open it up and modify tables. A lot of "tuners" don't want anyone to know that.

  6. SUPRA ULTIMATE B58 JB4 GUIDE AND LOG REVIEW (V1)

    Agreed, I hope the BEF works on MT cars because I love to tinker with it. I feel like having to wait on a tuner would drive me crazy.

  7. SUPRA ULTIMATE B58 JB4 GUIDE AND LOG REVIEW (V1)

    For some having 2 parts to the tune they just don’t want to deal with it but what i’m finding is the backend flash has all the fueling, timing and other parameters kinda ironed out already and you can easily make fine tune adjustments to the tune in just a few seconds without having to wait for...

  8. Tune on only 91 gas question. Big turbo?

    Get a jb4, catless DP and have Jesse Dabears make a tune for you from 1fastsupra dot com. I am betting to get over mid 400's you are going to need a different type of fuel on stock turbo. You could probably go direct meth injection and max out the stock turbo around 500whp or so. You don't have...

  9. SUPRA ULTIMATE B58 JB4 GUIDE AND LOG REVIEW (V1)

    any problems tuning a MT? On Jesse’s website it says he’s not doing any maps with MT

  10. SUPRA ULTIMATE B58 JB4 GUIDE AND LOG REVIEW (V1)

    My MT Supra just has a Function Werk catless DP and JB4. JB4 biggest limitation is inability to control fueling. So it can only push up to 33% more fuel than the stock map calls for. This makes it harder to make big power with ethanol. Also makes it harder to run high boost below 4k rpm or so...

  11. SUPRA ULTIMATE B58 JB4 GUIDE AND LOG REVIEW (V1)

    Thanks for the info! What mods have you done to your MT Supra? What are the limitations of the JB4 vs unlocked ECU with BM3/MHD? Thinking about getting an AA catted dp + DAW hypercore - would JB4 suffice?

  12. Dyno sheet

    Im not using mhd, bm3, jb4 or Ecutek. It was tuned by a local shop., they use their own software. It was tuned on 93. The only mods are a catted downpipe and intake. Im pretty sure the other software like Ecutek and mhd will give the tuner more options tonget better numbers. But when i tuned...

  13. Welp axle said bye bye...

    Intake, Downpipe, Charge pipe, Map 2 jb4 I came to a rolling stop with vsc off. I was going abt 10mph I hit it kept it straight for 2 seconds than hear Boom GRRRRRR :(

  14. Meth, Reflex, and Ecutek

    Thanks for your insight. Working with a very reputable tuner, so I’m confident as far as getting a base map flashed after installing everything. But when it comes to logging (I’ve street logged/tuned on previous vehicles) I really don’t want collect logs on the street this time. I’m in...

  15. GR Supra 101: Routes to big power

    Hey all! Question. Currently running jb4, but looking to do a Femto unlock next year. Eventually I want to do an upgraded turbo, it seems to get the most out of it, PI is recommended. Assuming I go bm3, do I install PI first and then upgrade the turbo? Or upgrade the turbo first then PI? Can I...

  16. How hard is it to maintain a fixed ethanol blend for tuning?

    With JB4 it is easy since I can just mix roughly 1:3 ratio of E to gas to begin, and the datalogs will tell me if I need more or less ethanol. With BM3 or MHD, I'd probably just go for full flex tune and flex sensors.
  17.

    FS: JB4 With BT and EWG

    Hey I was wondering if this was still available?

  18. GR Supra 101: Routes to big power

    JB4 Doesnt require a custom map. For plenty of users map 2 is good enough. If you want more or car isnt smooth then yes i do recommend it. IMO If i was on jb4 I wouldnt go catless. I just wouldnt want to neglect the CEL on the dash. Ive had quite a few people have a serious issue that was...

  19. GR Supra 101: Routes to big power

    I have cattle dp AA, and mpe. I already contacted him, only heard good things and actuality saw him here out couple kids here. I don't think I'll ever want more than 450whp on this car, since it's daily driven.

  20. GR Supra 101: Routes to big power

    If your ecu is locked you're going to have to ship it to femto. However, if it's already unlocked you can bench unlock the ecu at any garage it if it was sent back to the dealership, and then go with BM3 or MHD. Now back to your question. Well it all depends on your next steps. First of all get...





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