SUPRA ULTIMATE B58 JB4 GUIDE AND LOG REVIEW (V1)

[ColonelAdama]

Haha, I know I am getting throttle closure based on the log (and how the car is behaving). I don't know how to figure out why. What do you mean look at the throttle plate? Forgive my stupid question. The car has 7k miles and I haven't ever messed with the throttle body. Do you think it is defective? My understanding was that the throttle normally only closes like this when boost is significantly over the target but that doesn't seem to be happening.

Nothing wrong with the throttle, it's just because of your downpipe. Car is overboosting and the throttle is preventing the excess from entering the cylinders.

It's still running your wastegate as if there is the stock dp restriction. So you need to reduce FF(feed forward) until throttle pretty much stays wide open during the pull. FF is basically tied to turbine speed.

Try it in the 35-40 range first. It saves per map, under settings-advanced-user adjustment.

So you need to be on the intended map, then save the new FF value.

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[dAPEX]

Nothing wrong with the throttle, it's just because of your downpipe. Car is overboosting and the throttle is preventing the excess from entering the cylinders.

It's still running your wastegate as if there is the stock dp restriction. So you need to reduce FF(feed forward) until throttle pretty much stays wide open during the pull. FF is basically tied to turbine speed.

Try it in the 35-40 range first. It saves per map, under settings-advanced-user adjustment.

So you need to be on the intended map, then save the new FF value.

You are the man! Thank you so much. That sounds right since I noticed similar behavior even on map 0 logs. (attached to this reply).

https://datazap.me/u/dapex/supra-mk...trim=5&tmin=75.50&tmax=100.00&hg=1-2-4-18-9-1

 

[ColonelAdama]

You are the man! Thank you so much. That sounds right since I noticed similar behavior even on map 0 logs. (attached to this reply).

https://datazap.me/u/dapex/supra-mk...trim=5&tmin=75.50&tmax=100.00&hg=1-2-4-18-9-1

Yessir. A properly wastegate-dialed JB4 map is even smoother than map 0 with a dp.

I'll be away from my PC for a few days, so I'll have to catch up on reviews. But keep playing around with the FF setting. Drop until throttle is generally >90 during the pull. Read about duty bias in the first post after you have it somewhat sorted.

Car is happiest with ecu_psi being 1 psi below dme_bt across the whole range.

 

[dAPEX]

Yessir. A properly wastegate-dialed JB4 map is even smoother than map 0 with a dp.

I'll be away from my PC for a few days, so I'll have to catch up on reviews. But keep playing around with the FF setting. Drop until throttle is generally >90 during the pull. Read about duty bias in the first post after you have it somewhat sorted.

Car is happiest with ecu_psi being 1 psi below dme_bt across the whole range.

Thank you so much. I will report back with some new logs.

 

[dAPEX]

2024 MKV Supra 3.0 6 speed manual with VRSF highflow catted d*******, AWE touring catback exhaust, MST cold air intake, JB4 with latest firmware and fuel pressure control running E20 with mix of 93 octane and E85

Settings: FF 20, PID Gain 15, Duty Bias adjusted to settings in the first post

Map 1 3rd gear:

https://datazap.me/u/dapex/mkv-supr...5&tmin=94.53&tmax=100.00&hg=1-2-4-3-8-15-20-9

 

[ColonelAdama]

2024 MKV Supra 3.0 6 speed manual with VRSF highflow catted d*******, AWE touring catback exhaust, MST cold air intake, JB4 with latest firmware and fuel pressure control running E20 with mix of 93 octane and E85

Settings: FF 20, PID Gain 15, Duty Bias adjusted to settings in the first post

Map 1 3rd gear:

https://datazap.me/u/dapex/mkv-supr...5&tmin=94.53&tmax=100.00&hg=1-2-4-3-8-15-20-9

Definitely much better. Try updating to firmware V28 and do one more pull before we adjust anything further.

V28 has to be tuned differently than V27, so no point in doing it twice

 

[Got_M]

Lil stock turbo guy. Should be able to get a 7.xx with less DA and less fuel. Thanks @ColonelAdama for getting me dialed in! https://datazap.me/u/gotm/log-1742622362?log=0&data=1-4

 

[FLtrackdays]

When it gets really hot I’m going to do some pulls like @dAPEX did. That’s’ cool (pun intended) you were able to figure it out!

 

[ColonelAdama]

Lil stock turbo guy. Should be able to get a 7.xx with less DA and less fuel. Thanks @ColonelAdama for getting me dialed in! https://datazap.me/u/gotm/log-1742622362?log=0&data=1-4

Sub 8 coming soon! Really pushing the limits of the stock turbo here at 24-25psi on the BEF with meth.

@Got_M , What was the 60-130 on MHD E40 OTS?

 

[Got_M]

Sub 8 coming soon! Really pushing the limits of the stock turbo here at 24-25psi on the BEF with meth.

@Got_M , What was the 60-130 on MHD E40 OTS?

Dragy shows 8.9-9.1 consistently.

 

[dAPEX]

When it gets really hot I’m going to do some pulls like @dAPEX did. That’s’ cool (pun intended) you were able to figure it out!

Definitely much better. Try updating to firmware V28 and do one more pull before we adjust anything further.

V28 has to be tuned differently than V27, so no point in doing it twice

Map 1, 4th gear pull, V28, E30 (BP 93 octane + Casey's E85)

https://datazap.me/u/dapex/supra-mk...ata=1-2-3-4-8-9-15-20&hg=1-2-4-3-8-15-20-9-23

Map 2, 3rd gear pull, V28 (BP 93 octane + Casey's E85)

https://datazap.me/u/dapex/supra-mk...trim=5&tmin=75.35&tmax=100.00&hg=1-2-4-18-9-1

Still getting lots of throttle closures.

 

[ColonelAdama]

Map 1, 4th gear pull, V28, E30 (BP 93 octane + Casey's E85)

https://datazap.me/u/dapex/supra-mk...ata=1-2-3-4-8-9-15-20&hg=1-2-4-3-8-15-20-9-23

Map 2, 3rd gear pull, V28 (BP 93 octane + Casey's E85)

https://datazap.me/u/dapex/supra-mk...trim=5&tmin=75.35&tmax=100.00&hg=1-2-4-18-9-1

Still getting lots of throttle closures.

Map 1 looks pretty solid and only needs a few adjustments.

For Map 2, I would keep dropping the duties under 5k until you stop getting those throttle closures. Try in increments of 5.

 

[Got_M]

Finally hit a 7.xx

Next we go catless and make a few revisions. 7.7-7.8 or bust!

Stock turbo magic! Hit up @ColonelAdama

 

[Cfdproductions]

Finally hit a 7.xx

Next we go catless and make a few revisions. 7.7-7.8 or bust!

Stock turbo magic! Hit up @ColonelAdama

NICELY DONE THIS IS WHAT IM TALKING ABOUT !!!! btw do you have the slip with the splits for 60-70 70-80 80-90 and so on ?

 

[ciccio90]

Very interesting thread. I'm going to read through it even if it seems a little more informative for the MT! This is my late October run with only the jb4 and catless dp. 100-200 run which is (62-124)


I should probably get a JesseDaBears tune, I feel a lot of turbo surge...

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