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  1. New Car/Supra Owner need advice.

    2 - The only bolt-on that will give measurable performance gains is a downpipe, take your pick between a high-flow cat or a catless. Tends to make a pretty big difference in power, although a tune of some kind is needed to bring out the best of it (and prevent throttle closures in the case of...

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

    Thanks I’ll try to follow those guidelines for the FF adjustment. Had a clean run today in map 6 and didn’t get the same throttle closure. Hoping I can just dial in map 6 and run that most of the time. Do you go with PID gain on 0 in all your maps...

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

    Sadly a lot of people have jumped ship to unlock+MHD/BM3 because state-side unlocks are a thing and are so cheap that JB4 barely makes sense anymore. If you're serious about running JB4 long term and unlocking is out of the question, I highly recommend just buying a Jesse tune. Better than...

  4. Any issues from adding AA Gesi cat, etc

    If you do the proper unlock and tune process, yes it's more money and a lot more work for you, but you're going to thank yourself a bunch. All of the piggyback systems suck for MT because they're largely built with the auto trans in mind and with manual as an afterthought. JB4 is so bad with the...

  5. Best upgrades for stock 2021

    Wind buffeting kit for sure. Will make the experience with the windows down better. Just make sure you get some 3M Automotive tape to apply it with; my first set from Armaspeed had some no-name tape, and one of them flew off on the interstate not long after install. Wheel spacers is my 2nd...

  6. Downpipe CEL solution?

    I think the JB4 is in fact cheaping out. MHD/BM3 FTW. And besides, I still stand by the fact that bang for buck the JB+ really can't be beat.

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

    From what I understand, people like how quick and easy it is to edit your boost curve/map through JB4. Still doesn't really make sense for me, though, since MHD/BM3 both have multi-map.

  8. Soooooo State Side Unlock? Anyone?

    weirdly when i sent mine to Femto they loaded up a OTS bm3 stg 2 tune to my ecu so the drive to the tuner was 'different"........ I thought, gee.....must be cold outside as it's pulling harder. The baseline dyno pull was a shock! I haven't tried it since as the two custom tunes I am very happy...

  9. Pure 850 with JB4

    It technically is safe assuming you're running a map 6 that's tuned for it. There have been JB4 pure800/850 builds that have more or less worked alright in the past. That being said, nobody, not even Jesse, recommends running a hybrid/upgraded turbo on JB4; you really should get an unlock and...

  10. trash site

    No need to attack me over a platform (which is used in far more S58s than MHD/BM3 btw). There's simply more demand for it. Topic was S58 tuning and I contributed. I like this thread, so lets not tarnish it. Its clean timing, not "no corrections", but rather "no corrections that actually lose...

  11. No tune with catless DP?

    You're safe to run without a tune, but a totally stock tune Supra that's catless can end up with throttle closures which will hurt performance and/or make acceleration less smooth. With JB4 you'll gain some power but definitely would want to get some custom map 6 help from the JB4 log review...

  12. New to forum - got my 2026 MkV M6 Final Edition Delivered - questions!

    As phil said the search bar does wonders I already made a 101 thread Ill link it. https://www.supramkv.com/threads/gr-supra-101-routes-to-big-power.17670/ To answer your questions: 1. Ps4s better. no need for coding go up to 305's in the back if you want. or stock size do what you like. no...

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

    yes absolutely, the JB4 limitation of not being able to run a lot of mid range boost is much easier on the clutch. I know a lot of people are replacing clutches on just MHD 91 maps lol for 91-93 try map 1 first and see how timing looks

  14. Bench unlock - conflicting info

    I know this has been talked about a lot, please bear with me. I've spent countless hours reading forums, checking websites, and emailing companies. I've been wanting to get my 2020 supra tuned with just intake, charge pipe, and exhaust. I've had the parts just sitting for over 2 years and just...

  15. Gas Stations with E in OC

    I’m debating JB4 vs MHD, and yes, I know how you feel about JB4 ? I’d like to pass smog without needing to resend the DME out every time and paying, that’d be cost and time prohibitive

  16. FI Exhaust Downpipe No CEL - Anyone Have/Had This?

    Ya, I think I'm just gonna grab another plain ass catless. All the videos and websites are being sneaky with these no CEL "catless." The stuff I could find does not look full catless, which is why I posted. I was just hoping for no CEL just because, but oh well, Ill save hundreds by getting a...

  17. NEW Pure 900 turbo

    unlock (femto) and backend flash appears to be just as most custom tunes in my experience. I do agree jb4 locked cars and upgraded turbo's is a terrible route to good reliable power.

  18. NEW Pure 900 turbo

    Personally I wouldn't run JB4 at all with a non-stock turbo. If you can't afford to get an unlock and proper MHD/BM3 tune to go with your turbo upgrade, you shouldn't be buying the turbo upgrade in the first place. All JB4 does is control boost and wastegate parameters by fooling the ECU, so I...

  19. Bootmod3

    If you're not overly worried about power gain and just want some extra power on a stock setup, it's a lot cheaper and easier to just run a JB4. It's more or less a glorified boost controller, but will get you around 30-40 more WHP on 93 Octane (and can get you into the upper 400's with a catless...

  20. Lol Supra haters 🤷🏻‍♂️

    Thank you for the info. Currently she is my only means of transport and I work M-F 8-5 so yeah, not having an operating vehicle is a big factor. Sure, I could rent a car but once the dme leaves my hands there's no telling what can/will happen despite anyone's "gurantees". If you can recommend a...





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