B58 JB Plus Quick Install Tuner ....

[1Tyrant1]

Haven't come across this jerky issue yet halfway through my second tank of E blend. Auto though....

Are you running E30?

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[GreyMadder]

Are you running E30?

Roughly yes

 

[mushx]

i bought a used jb+ on FB
its been on my 2023 auto for a week now with no problems

 

[ColonelAdama]

I am having the same issue. Dialed the knob to between 3 and 4 oclock and it seems better but still there.

FYI - had the same issue with a few JB4 maps, so i got to datalog it. It is the throttle closing due to overboosting. Do you happen to have an aftermarket downpipe? I think that is partly why the issue got worse for me.

Hard to mitigate without the wastegate control that JB4 offers.

 

[1Tyrant1]

FYI - had the same issue with a few JB4 maps, so i got to datalog it. It is the throttle closing due to overboosting. Do you happen to have an aftermarket downpipe? I think that is partly why the issue got worse for me.

Hard to mitigate without the wastegate control that JB4 offers.

That makes a lot of sense! and yes I do have an Armytrix catless downpipe. I guess turning down the JB+ knob even more might help? Will adding E help?

 

[ColonelAdama]

That makes a lot of sense! and yes I do have an Armytrix catless downpipe. I guess turning down the JB+ knob even more might help? Will adding E help?

Yep, I read on the JB4tech forums that freer flowing downpipe already raises boost/messes with wastegate programming. Stacked with the JB+ that does not have EWG control...

It's possible that E could help throttle closures but not for the right reasons. I posted earlier in this thread how the B58 will lower boost targets when nearing a fueling ceiling. Stay E30 or less.

Maybe turning the JB+ down more would help, but definitely consider going JB4. The install is hardly more work than the JB+. ~1 hr at most. Be warned that it could take some time to get it dialed in smoothly though.

 

[jtsang25]

Anyone get theze codes with the JB+? 11B401 and 11B501? What are these and what could cause these.

 

[BMWAF]

The install is hardly more work than the JB+. ~1 hr at most.

LOL. I'm not saying the install of a JB4 is hard but "hardly more work" is a massive exaggeration! The JB+ literally takes a minute - five at most. And if that's hardly less work, you can call me Susan.

 

[ColonelAdama]

LOL. I'm not saying the install of a JB4 is hard but "hardly more work" is a massive exaggeration! The JB+ literally takes a minute - five at most. And if that's hardly less work, you can call me Susan.

Relative to the usual amount of time working on a car takes, it's hardly more

 

[D K]

LOL. I'm not saying the install of a JB4 is hard but "hardly more work" is a massive exaggeration! The JB+ literally takes a minute - five at most. And if that's hardly less work, you can call me Susan.

5 minutes later... HI SUSAN!!

 

[ArmenLS1]

2021 Supra, AA catted DP, jb+ tuner set at default 3 o'clock position. Lowering springs, stock tires, pressure at 31 psi. My numbers on the right, 2019 RS3 on jb4 map 4 in the left. Launched this time in 1st gear. TC, VSC fully off.

 

[Syeeee]

2021 Supra, AA catted DP, jb+ tuner set at default 3 o'clock position. Lowering springs, stock tires, pressure at 31 psi. My numbers on the right, 2019 RS3 on jb4 map 4 in the left. Launched this time in 1st gear. TC, VSC fully off.

Impressive with just dp and jb+ tuner at default position.

I know you previously did 12 flat with just jb+ before

 

[ArmenLS1]

Impressive with just dp and jb+ tuner at default position.

I know you previously did 12 flat with just jb+ before

Yes sir, but the DA on that run was in the negative. This run had a bad DA. Still happy with results. I did do another run launching in 2nd, pulled a 11.9 @ 120. 60 foot was slightly worse because I didn't load up the transmission past 1800rpm.

 

[Syeeee]

Yes sir, but the DA on that run was in the negative. This run had a bad DA. Still happy with results. I did do another run launching in 2nd, pulled a 11.9 @ 120. 60 foot was slightly worse because I didn't load up the transmission past 1800rpm.

With wider grippier nittos/toyos on the rear, should be an improvement over stock.

 

[ArmenLS1]

With wider grippier nittos/toyos on the rear, should be an improvement over stock.

I have a pair 285-35-19 NT555r2's that I'll put on for next season. By Sept I'll have ecu back from Femto. I'm more interested in seeing how much of a performance gain I'll see going to the stage 2 OTS 93 map.

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