Going lean down low. Give this map 6 a try. No need to change duty bias yet.
Will do, I'll try and get one more pull tonight. Thank you again.Going lean down low. Give this map 6 a try. No need to change duty bias yet.
sorry to prob sound like a broken record.Here's a tip for MT cars:
Key is to keep ECU_PSI under DME_BT by 2-3 psi. Sometimes you may see an unexplained dip in DME_BT. This indicates that the FF curve is too high at the given RPM before the DME_BT dip.
In this case, I dropped duty bias at 4500 by 2, and dropped duty bias at 5000 by 1.
MT cars HATE cylinder-overfill. Any higher boost than was expected is going to make the car unhappy and drop boost targets. This part is really what makes tuning them so tricky.
Changing the JB4 boost targets also alters the FF curve, so it is best to just go additive mode and stick with the same targets and FF-value. That leaves just duty bias as a variable to adjust and smooth things out.
Duty bias used here are similar to any other catless Supra, however FF is set to 12. Everything else is standard settings on the MT firmware.
So I did a map 1 and map 0 log as well to try and see if those would change the weird ignition timing I was seeing. Unfortunately I grouped the logs, so pull 1 is map 1 and pull 2 is map 0.
Just saw all your logs, Map 0, 1 , and 2. I can definitely say you are quite octane deficient. Even stock has timing corrections. You said this was 93, so that's pretty disappointing. Would recommend filling up at a different pump next time.
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As you expected, the downpipe needs to be tuned for.Hi all!
2023 3.0 AT Prem, catless DP (Armytrix) and intake are the only aftermarket performance mods (well, intake for the sound ... but thought I'd still mention
Post DP install, I immediately noticed lack of rear wheel traction in 1st through 3rd with WOT - main reason I picked up JB4. This is my daily vehicle so FEMTO unlock currently not an option. Plan to replace tires (with PS4S 275/295 ... or 285/305 if I can squeeze on stock wheels - can anyone please confirm?) sooner than actually needed. This should help, but figure some tuning/adjustments (at least duty bias) are needed regardless... and a little extra power never hurts! Have had her a little over a year and have ran her 8,300 miles, "manually" shifting about 95% of drive time... very familiar with the feel of each gear's (well, at least 1-5) pull throughout RPM band. That said, significant difference with catless DP... likely boost kicking in too early.
Inexperienced when it comes to tuning an engine (bear with me here, please), but have read through the JB4 bible and very eager to learn.
Logs are with 93 octane (should be). Have access to (and 5 gallons in garage) E85 and would like to run a blend once I have a better understanding of what I'm doing.
Lastly, noticed exhaust is louder and raspier immediately following cold start up (while idling, until engine warms/settles) in Map 1 vs. 0/stock. Again, new to all of this, but why that would be?
Thanks in advance for any/all feedback, my friends!
@ColonelAdama, sincere THANKS for this thread and for sharing your knowledge and experience/understanding... much appreciated!
Map 0 - Grouped log (sorry)... think middle of timestamp/log is best pull for analyzing. Didn't manually shift so she dropped to 2nd gear (and pulled through 3rd)
Map 1 - Felt horrendous. Slippage and clunky.
Map 2 - Felt much better than map 1 !
| duty_15 | duty_20 | duty_25 | duty_30 | duty_35 | duty_40 | duty_45 | duty_50 | duty_55 | duty_60 | duty_65 | duty_70 |
30 | 30 | 30 | 32 | 34 | 34 | 34 | 46 | 64 | 64 | 66 | 68 |
FF is 32, seems a bit too low for AA catted. Need to close the wastegate more to get closer to boost targets.
Looks pretty good! Timing is perfect (that's why we love our ethanol around here). Lets try to get boost closer to target though. Going to try to fit your FF curve to the WGDC a bit better.
| duty_15 | duty_20 | duty_25 | duty_30 | duty_35 | duty_40 | duty_45 | duty_50 | duty_55 | duty_60 | duty_65 | duty_70 |
50 | 50 | 50 | 50 | 50 | 50 | 55 | 60 | 60 | 60 | 55 | 55 |
Thank you for the quick feedback - will make the changes and will run/post new log!
Almost certainly the JB4 exhaust flap control is opening on cold start. Whereas OEM mode keeps valve closed until cold start is finished.
Yeah, honestly haven't seen logs from a stock DP MT yet, so not 100% sure. I would assume the same tuning method.
