SUPRA ULTIMATE B58 JB4 GUIDE AND LOG REVIEW (V1)

[Thatpartsguy]

Good morning everyone, finally got the install done and took some initial logs. I would greatly appreciate some input and thoughts on what I might need to start changing. The pulls felt ok I could tell it was not happy with something as it felt stronger overall on map 0. Thank you for your help!https://datazap.me/u/thatpartsguy/2026-supra-6mt-initial-logs?log=0&data=1-4

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[ColonelAdama]

Having a go at it myself I have continued to lower FF and Duty in pursuit of no closures, ECU PSI below 16psi, and Calc Torque below 48

I want to keep chasing ecu psi but is it ok to have such low FF and Duty 3k and lower? Is it normal for the boost to peak then dip so much? It seems like I've taken some steps forward but with not much lower to go on duty and FF I don't know what to do. Since the throttle closures are minor in the most recent pulls should I worry about it? I rarely put my car in a pre 3K rpm Wot situation.

Hot day pull, no throttle closures, ecu psi still high
Map1 FF5 10/10/7/7/20/20/39/48/55/57/62/63
https://datazap.me/u/jtignor/map1-ff5-1010772020394855576263?log=0&data=1-2-4-8-9-13-20

MOST RECENT
Did some more pulls when it was slightly cooler and ran into throttle closures again. I lowered Duty some more and still seeming to struggle with closures and ecu psi.
Map1 FF5 7/7/5/5/25/25/34/42/51/57/62/62
https://datazap.me/u/jtignor/map1-ff5-77552525344251576262?log=0&data=1-2-4-9-13


No longer attempting
Also played with some Map 6 additive to taper boost before 3k rpm
Map 6 3 psi FF10 Duty: 10/10/7/7/20/20/39/48/55/57/62/62 Boost: 2/2/2.4/2.7/3/3/3/3/2.5/2/1.9/1.5
https://datazap.me/u/jtignor/map-6-3-psi-ff10-1010772020394855576262?log=0&data=1-2-4-9-13

boost control isnt bad, you can add a bit more duty to 3500 to fix that torque dip, but otherwise your main issue is lack of octane. Good bit of timing corrections

you can try IAT spoofing higher to see if that lowers the base timing, like 130. or any ethanol/octane booster at all would fix it.

 

[ColonelAdama]

Good morning everyone, finally got the install done and took some initial logs. I would greatly appreciate some input and thoughts on what I might need to start changing. The pulls felt ok I could tell it was not happy with something as it felt stronger overall on map 0. Thank you for your help!https://datazap.me/u/thatpartsguy/2026-supra-6mt-initial-logs?log=0&data=1-4

Try Map 1 at FF 30 first. car is stock?

 

[Thatpartsguy]

Try Map 1 at FF 30 first. car is stock?

will do, car has high flow cat only.

 

[Thatpartsguy]

will do, car has high flow cat only.

If I change FF in the tuning section does it change globally or just for map 6? Also in your guide you recommend to set boost failsafe at 23 psi, it seems in my settings I can only set it up to 20 psi.

 

[jmikes]

If I change FF in the tuning section does it change globally or just for map 6? Also in your guide you recommend to set boost failsafe at 23 psi, it seems in my settings I can only set it up to 20 psi.

All settings excluding the slider bar settings are global.

I've had problems with failsafe saving a desired PSI as well, try some random decimals like 23.1 or 23.4 and see if it helps.

 

[ColonelAdama]

If I change FF in the tuning section does it change globally or just for map 6? Also in your guide you recommend to set boost failsafe at 23 psi, it seems in my settings I can only set it up to 20 psi.

FF is saved per map, so save it to whatever map you intend to use.

Should allow down to like 21-22 psi minimum, maybe it is an app glitch

 

[Thatpartsguy]

FF is saved per map, so save it to whatever map you intend to use.

Should allow down to like 21-22 psi minimum, maybe it is an app glitch

Ok ive got some new logs, thank you guys very much for the help!https://datazap.me/u/thatpartsguy/map-1-ff30?log=0&data=1-4&zoom=250-312

 

[Thatpartsguy]

FF is saved per map, so save it to whatever map you intend to use.

Should allow down to like 21-22 psi minimum, maybe it is an app glitch

Some more logs on 94 with 2 gal of e85. Let me know what ya think, thank you for your help!https://datazap.me/u/thatpartsguy/942gal-e85-map1-ff30?log=0&data=1-4

 

[Thatpartsguy]

Some more logs on 94 with 2 gal of e85. Let me know what ya think, thank you for your help!https://datazap.me/u/thatpartsguy/942gal-e85-map1-ff30?log=0&data=1-4

Some feedback here for anyone following
https://www.supramkv.com/threads/jb4-log-review.32823/#post-504652

 

[ArthurWick]

Just installed the JB4. Car is a 21 and has CTS Turbo CAI with AA catted DP. I did adjust duty bias as recommended in the @ColonelAdama original post for the catted DP. I did 2 logs on map 1 and 1 log on map 2.

@ColonelAdama I’d like some feedback please. Fuel is 91 with VP octane booster -> 93 ish. No ethanol at all where I live.

Also is there a way to keep the logs separated? Do I have to save them separately after each run? Didn’t think of it before doing these 3 runs.

https://datazap.me/u/arthurwick/2-run-map-1-and-1-run-map-2?log=0&data=1-4

 

[ArthurWick]

@ArthurWick did you change your FF? pretty sure you left it at 50. Change your FF to 40 and log again.
idk if the octane booster is recommended.

I did left FF as it was. Will log again with FF at 40.

Octane booster’s the only way to achieve 93 ish octane with the crappy fuel in my area, unfortunately no corn juice up here!

 

[ArthurWick]

@ArthurWick did you change your FF? pretty sure you left it at 50. Change your FF to 40 and log again.
idk if the octane booster is recommended.

@ArthurWick did you change your FF? pretty sure you left it at 50. Change your FF to 40 and log again.
idk if the octane booster is recommended.

Not near my car at the moment, but it’s this parameter that I have to set to 40 right?

 

[ArthurWick]

@ArthurWick did you change your FF? pretty sure you left it at 50. Change your FF to 40 and log again.
idk if the octane booster is recommended.

Hi all! So 2 new logs, FF set at 40 for both maps (1 & 2). Fuel 93 ish. 4th gear pull in both.

Map 1

https://datazap.me/u/arthurwick/map-1-4th-gear-pull-ff-40?log=0&data=1-4

Map 2

https://datazap.me/u/arthurwick/4th-gear-pull-map-2-ff-40?log=0&data=1-4

Duty bias is as shown here. Advices? Thanks!

 

[razorlab]

Hi all! So 2 new logs, FF set at 40 for both maps (1 & 2). Fuel 93 ish. 4th gear pull in both.

Map 1

https://datazap.me/u/arthurwick/map-1-4th-gear-pull-ff-40?log=0&data=1-4

Map 2

https://datazap.me/u/arthurwick/4th-gear-pull-map-2-ff-40?log=0&data=1-4

Your timing is absolutely horrific. Less boost or more octane.

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