SUPRA ULTIMATE JB4 GUIDE AND LOG REVIEW (V1)

[ColonelAdama]

Great example where having total control of ignition timing and fueling would be very helpful. Anyway, I'm not here in this thread to keeping shouting the merits of actual ECU control.

No worries, I think it is a valid discussion point for 2020s.

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[Bug2th]

Meth gains are huge lol, like 50whp+. It would need a new tune since boost requests would be much higher when fueling or octane are no longer the bottleneck.

and this wouldnt require anything else like fuel pump upgrades, etc. to get there?

 

[Phantomx]

MHD BEF and JB4 is a great combo. It was about 60rwhp more and a bunch of tq as well using the two vs an OTS map for MHD. I’m sure you can get there on a custom MHD map but I love the flexibility of tweaking with the Jb4 and not having to keep reflashing or getting tune updates and then reflashing. I could tweak in the car on demand.

 

[ColonelAdama]

and this wouldnt require anything else like fuel pump upgrades, etc. to get there?

Nah, Meth is the additional fuel. Will reduce the DME fuel demand substantially. Trims drop a lot, which should allow you to run more boost and ethanol.

I have reviewed some meth logs, but I've not custom tuned someone on it yet.


Here is a 99% meth log on an M340 for example:
https://datazap.me/u/coloneladama/log-1714512217?log=0&data=1-2-4-14

It is running 7-8psi over stock and trims are in the single digits and teens. DME is actively removing fuel to keep AFR at lambda 1 (14.7).

A ton more pulls of the same car - Trims bottoming out. In theory, you should be able to add a ton more ethanol and boost and it'd take it fine.
https://datazap.me/u/coloneladama/log-1714512399?log=0&data=1-14-18&zoom=1183-1403

Presumably you'd just reach the limit of the stock turbo at ~25psi, good bit over 500whp.

 

[staykindasick]

Happy I found this thread. I had a 22 AT with boostlogic catless DP, exhaust, hks intake and JB4 on map2 93oct and car ran amazing.

Traded in on a 24 MT, been waiting to see some good news before I hung all my parts on the new car. Thanks everyone for all the work, looking forward to helping out and atleast adding some data here soon.

 

[Got_M]

Nah, Meth is the additional fuel. Will reduce the DME fuel demand substantially. Trims drop a lot, which should allow you to run more boost and ethanol.

I have reviewed some meth logs, but I've not custom tuned someone on it yet.


Here is a 99% meth log on an M340 for example:
https://datazap.me/u/coloneladama/log-1714512217?log=0&data=1-2-4-14

It is running 7-8psi over stock and trims are in the single digits and teens. DME is actively removing fuel to keep AFR at lambda 1 (14.7).

A ton more pulls of the same car - Trims bottoming out. In theory, you should be able to add a ton more ethanol and boost and it'd take it fine.
https://datazap.me/u/coloneladama/log-1714512399?log=0&data=1-14-18&zoom=1183-1403

Presumably you'd just reach the limit of the stock turbo at ~25psi, good bit over 500whp.

Soon

 

[ColonelAdama]

https://www.jb4tech.com/forum/model...-jb4-b58-gen2-port-injection-manifold-testing

Cool news!! PI coming to JB4 for locked ECU cars!

650 whp on a hybrid turbo M340i LOCKED. Interested to see more on this.

 

[ColonelAdama]

Good dyno results today for a B58 running my custom Map 6 (93 octane) ! 441whp on a mustang dyno

+35whp/61wtq at +3.7psi additive. Timing starts falling apart at any higher boost levels on this fuel due to 100+ IATs

https://datazap.me/u/coloneladama/log-1715109752?log=0&data=1-2-3-4-8-15-20&zoom=286-358 (not from the dyno, but from the street tuning)

AA Catted DP, BMC Drop-In Filter, Stock Tune
406WHP/443WTQ

AA Catted DP, BMC Drop-In Filter, JB4 Map 6 on 93 Octane
441WHP/504WTQ

 

[Got_M]

https://www.jb4tech.com/forum/model...-jb4-b58-gen2-port-injection-manifold-testing

Cool news!! PI coming to JB4 for locked ECU cars!

650 whp on a hybrid turbo M340i LOCKED. Interested to see more on this.

Wonder what turbo this is... Hmm...

 

[ColonelAdama]

Wonder what turbo this is... Hmm...

AGT apparently. Must be still in development since there aren't any B58 options on their website.

 

[Fireball_8]

Hi all,

New to the thread, but trying to follow the guide without bothering anyone. Just got the JB4 with wireless and ran my first log and was wondering if I could get some input on it. Thanks in advance!

https://datazap.me/u/fireball8/mkvkiddo-051024?log=0&data=1-4

Modifications: air intake
2023 3.0 Premium MT
Conditions - road wet (after rain), 52 degrees

 

[Isaleus]

Basically same boat as @Fireball_8 . Basically Stock MT pulls. Map 1

https://datazap.me/u/isaleus/map-1-93-2-pulls?log=0&data=1-4-11

 

[ColonelAdama]

Basically same boat as @Fireball_8 . Basically Stock MT pulls. Map 1

https://datazap.me/u/isaleus/map-1-93-2-pulls?log=0&data=1-4-11

Looking good. Very glad to see JB4 has no issues on a stock MT.

 

[ColonelAdama]

Hi all,

New to the thread, but trying to follow the guide without bothering anyone. Just got the JB4 with wireless and ran my first log and was wondering if I could get some input on it. Thanks in advance!

https://datazap.me/u/fireball8/mkvkiddo-051024?log=0&data=1-4

Modifications: air intake
2023 3.0 Premium MT
Conditions - road wet (after rain), 52 degrees

Things are looking pretty normal, but need a proper log to review properly. ~3k rpm to 6500 pull in 3rd or 4th + a shift up, then let off.

A pull in my car for example:
https://datazap.me/u/coloneladama/log-1715607256?log=0&data=1-2-3-4-11

 

[sa90h]

Could someone take a Quick Look at this log? Seems to be dying off top-end.

This is Map 1, 91 octane on my 2020 supra. This log does start in 2nd gear and goes to third.

I think my problem is the lack of good fuel where I live. Might try to mix a couple gallons of e50 from a flex fuel pump by me.

https://datazap.me/u/sa90h/2-3rd-gear-20-90-mph-map-1?log=0&data=1-4

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