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It's a more aggressive sport setting for both the engine and transmission.

Still no issues from my end. Boost comes on strong and is readily available when I have the Supra in Sport and Sport+ mode. No abrupt spikes in boost and power delivery is manageable with the throttle pedal as if it were stock. The DME does a great job with adjusting to the added boost from...

2021 GTR vs 2021 GR Supra:

I'm using a JB+ and there's a small dial inside the unit that let's you increase and decrease the amount of additional boost over stock (0-4.5 psi according to BMS).

Mine had been at the 4:30 position for months and I haven't encountered any problems with the JB+.

I noticed the same rapid drop happening to mine as well. My Supra was at the Max level up to 1300 miles and when I checked again at the 1400 mile mark, the oil indicator showed me losing 1/4 a quart of oil. I finally hit the 1500 mile mark and the oil level is slightly above minimum. I just...

Good to hear that you finally got a working JB+unit. The stock tires being able to break loose at 60mph with 3rd gear pulls is lots of fun and a noticeable difference over stock. My unit is dialed in to the 4:30 position (a smidge below the max boost setting) and there's been no CEL for me...

Were there attributes that were lacking on your 2020 Supra? Are you keeping your RCF?

Yes, my A91 Supra has the coveted unlocked ECU. :D I was supposed to already have my Supra tuned via ECUTEK last January but with the recent oil consumption issues becoming more prevalent with the 2021MY Supras, I'm waiting until the bad batch of engines can be identified before I fully void my...

For reference, mine is a 6/20 build with an ECU date of 5/25/20. No issues with my JB+.

The stock stall speed can reach that high of an RPM? I'll have to give it a try while keeping it gear in 2nd. EDIT: I just came back from doing some spirited launches (for the sake of science) and confirmed that on 2nd gear, the stall can reach 2.5k-2.8k without issue. Even with a launch from...

That's a shame. It's strange that some 2021 Supras aren't accepting the JB+ without throwing codes and some are working as intended. Do you have a locked ECU? If so, I wonder if there's a safeguard or something within the ECU detecting the altered signal from the JB+. My A91 Supra has the...

Let's hope the replacement unit is a success. Did you adjust the dial and what octane gas are you using? I've been driving my A91 Supra extra hard lately to try and get a code to pop up and the JB+ continues to work as it should. The dial on my unit is turned to the 4:30 position (slightly...

The current 2021MY Supra brochure still shows the rear spoiler as carbon fiber.

Did BMS offer to replace your JB+ with another unit? It may be worth a shot to see if the replacement JB+ is issue free before spending extra money towards the JB4, especially if you only plan on utilizing pump gas. Not all of us are having problems with the JB+ so there's still hope with the...

I've used apps like Torque Pro and OBD Fusion in the past to review and delete codes for my other vehicles but I haven't tested it out on the Supra to see if it works the same.

Did BMS offer to replace your JB+ with another unit? If you plan on eventually upgrading to a JB4, it may be worth a shot to see if the replacement JB+ is issue free before spending extra money towards the JB4, especially if you only plan on running Map 2 on pump gas. Not all of us are having...

Not sure what's going on with your JB+ unit but hopefully BMS provides you with a respond and/or a replacement unit. I did multiple WOT pulls to see if I could trigger any overboost or drivetrain warnings but everything continues to run smoothly with my Supra and the JB+ with the setting at...

I recently had mine installed and it makes the stock tires lose grip at 50-60mph at WOT when it previously wouldn't have when stock (and induces lots of grins). I adjusted the dial on mine to be slightly below the max setting and I have not yet noticed any issues with jerkiness, shift delays...

She flew to the Toyota USA headquarters in Texas to pick it up and it had 81 miles. I wonder if it's the press release version that was first shown in February 2020...