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Search took 0.00 seconds. Search: Posts Made By: callisto
Forum: BRZ First-Gen (2012+) — General Topics 11-10-2025, 02:40 PM
Replies: 325
Views: 75,175
Posted By callisto
Noted, departing lawn.

Noted, departing lawn.
Forum: BRZ First-Gen (2012+) — General Topics 11-10-2025, 06:10 AM
Replies: 325
Views: 75,175
Posted By callisto
45 here, been driving gen1 since year one. Huge...

45 here, been driving gen1 since year one. Huge upside for being old and tuning this car is that I did CALL -151 assembly language stuff as a kid, so working with our ECU is weirdly nostalgic.
Forum: BRZ Photos, Videos, Wallpapers, Gallery Forum 10-25-2025, 02:27 PM
Replies: 1,269
Views: 883,984
Posted By callisto
New tires and wheels for the move from summerland...

New tires and wheels for the move from summerland to PNW. Apex SM-10RS, 225/45/17 DM06, stock (PP) suspension. I kept the original center caps because they fit the aesthetic better.
Forum: Software Tuning 10-16-2025, 02:40 AM
Replies: 2
Views: 509
Posted By callisto
V00C00G 17-20 USDM / EDM / JDM hybrid integrated ECU project

2025-11-08: v21 posted; see #3 for details.

When I set out to buy a new 2020 BRZ a few years ago to replace my seal-distraught 2013, the dealer misplaced it on the lot and conveniently found it...
Forum: Software Tuning 08-10-2025, 08:36 AM
Replies: 10
Views: 2,480
Posted By callisto
Been thinking about this more and studying code....

Been thinking about this more and studying code. IAM ranges from max 1.0 + max KCA all the way down to 0.0 at -5 tuning, by which time it will have cut out boost, AVCS, and rescaled the throttle. But...
Forum: Software Tuning 08-03-2025, 06:32 AM
Replies: 10
Views: 2,480
Posted By callisto
As an interesting side note on this topic - the...

As an interesting side note on this topic - the engine's calculated torque formula (from A to V) is:

[ IAM * Calculated Torque A ] + [ (1.0 - IAM) * Calculated Torque B ]

So, if you're detuning...
Forum: Issues | Warranty | Recalls / TSB 08-01-2025, 01:40 AM
Replies: 92
Views: 22,998
Posted By callisto
Gear Shift Indicator tables (gen1)

After years of investigating, I think I have found the gear shift indicator thresholds; they would be useful for estimating when "lugging" could occur, but they're calculated in part using the engine...
Forum: Software Tuning 08-01-2025, 12:24 AM
Replies: 8
Views: 2,637
Posted By callisto
The CEL array is in the later area of the ECU,...

The CEL array is in the later area of the ECU, well past most of the program code and amidst various tables and such. For whatever reason all the ECUs open with P0300 (which is multi-use), so...
Forum: Software Tuning 07-24-2025, 08:33 PM
Replies: 14
Views: 1,365
Posted By callisto
No worries :) And yeah, I assume that EcuTek can...

No worries :) And yeah, I assume that EcuTek can see all this, but that doesn't help me understand how the OEM auto-adapt logic works - that just helps me understand what all the tables are for. My...
Forum: Software Tuning 07-23-2025, 06:50 PM
Replies: 6
Views: 1,027
Posted By callisto
That is excellent news, thank you for confirming...

That is excellent news, thank you for confirming (not sarcastic!), I appreciate the details and will study Q00G next.
Forum: Software Tuning 07-19-2025, 12:10 PM
Replies: 6
Views: 1,027
Posted By callisto
Agreed! I'd love to know if it has any noticeable...

Agreed! I'd love to know if it has any noticeable effect for anyone else. My last year of testing was U01A with injector and timing tables from S20G, but once I mapped enough ECUs to compare and find...
Forum: Software Tuning 07-09-2025, 03:06 AM
Replies: 6
Views: 1,430
Posted By callisto
Lightbulb By the way - I found a pathway into this sort of...

By the way - I found a pathway into this sort of thing, except through CAN bus rather than in OBD2 pids. The old long-ago Subaru tuning folks from the 00's used the OBD and CAN entries to understand...
Forum: Software Tuning 07-09-2025, 02:55 AM
Replies: 6
Views: 1,027
Posted By callisto
Post 18-19 MT EU have a more detailed DI/PI ratio tune than 17-20 JP/US

2018 MT EU (ZA1JQ00G) and 2019 MT EU (ZA1JS20G), received a much more detailed DI/PI ratio tune (direct/port injection) than either US or JP markets received at any time during gen1. Perhaps this was...
Forum: Software Tuning 07-08-2025, 06:34 PM
Replies: 14
Views: 1,365
Posted By callisto
To run 2020 V00C USDM on pre-2020 US, patch CAN id 0x3D7 to 0x3D1

For the past couple years I've been trying to get the stock 2020 USDM ecu to work on the 2019 USDM, as it contains a variety of tuning changes that Subaru made in the car's final year (that I suspect...
Forum: Engine, Exhaust, Transmission 12-26-2024, 06:33 PM
Replies: 21
Views: 5,201
Posted By callisto
I don’t have engine assembly experience, but some...

I don’t have engine assembly experience, but some triage thoughts for you to check if you have not already - once in a while a naive eye can help:

https://www.ft86club.com/files/BRZengine.pdf
...
Forum: Software Tuning 10-30-2024, 09:45 PM
Replies: 6
Views: 1,430
Posted By callisto
I can validate this - thanks for posting it! I...

I can validate this - thanks for posting it! I hadn't looked into any of this since I began. Opened up K00G and after an afternoon of study, your read looks valid.

It looks like in S10C the unused...
Forum: Software Tuning 07-05-2024, 05:03 PM
Replies: 11
Views: 2,727
Posted By callisto
(Also, I missed your software question, sorry - I...

(Also, I missed your software question, sorry - I haven’t seen anyone reporting evap stuff persisting across an ECU reset without it being a mechanical issue.)
Forum: Software Tuning 07-05-2024, 03:20 PM
Replies: 11
Views: 2,727
Posted By callisto
In the service manual, expand "Engine / Hybrid...

In the service manual, expand "Engine / Hybrid system" to "FA20 ENGINE CONTROL" to "SFI SYSTEM" and then open up the P0451..0453 page:

https://gt86stuff.onrender.com/t3Portal/

It's got a series...
Forum: Software Tuning 07-04-2024, 04:29 PM
Replies: 9
Views: 6,727
Posted By callisto
Aha, I recognize that memory address, I've been...

Aha, I recognize that memory address, I've been looking into this previously.

S10C/FFF815E0, K00G/FFF810B4 - there are 35 pairs of (A, B) floats, stored in the order A1 B1 A2 B2 A3 B3 etc. The...
Forum: Software Tuning 01-13-2024, 02:31 AM
Replies: 28
Views: 17,890
Posted By callisto
Well, I dug into that question for a while and it...

Well, I dug into that question for a while and it is very twisty and a lot of threshold adjustments. But there's this one block that, if FFF8AAE2 is set to false, ends up seeming to maybe disable...
Forum: Software Tuning 06-28-2023, 06:39 AM
Replies: 57
Views: 34,910
Posted By callisto
Ported ztan's speed density code to ZA1JK00G

I ported this to K00G, but I don't have a 'lab' vehicle to test it on right now, so I can't guarantee this works yet. Still, here's my porting notes and a patched K00G, romraider, logcfg; as well as...
Forum: Software Tuning 06-18-2023, 06:57 PM
Replies: 15
Views: 6,278
Posted By callisto
I haven't checked all of the uses yet, so I...

I haven't checked all of the uses yet, so I didn't feel comfortable declaring with certainty that it's only VVT. Seems probable, though!

I've found one instance so far where the oiltemp-specific...
Forum: Software Tuning 06-18-2023, 06:21 PM
Replies: 15
Views: 6,278
Posted By callisto
The engine oil temperature, and adjusted values...

The engine oil temperature, and adjusted values derived from it, are referred to in at least forty different ECU functions; primarily in the variable valve timing code.
Forum: Software Tuning 06-15-2023, 03:40 AM
Replies: 11
Views: 8,426
Posted By callisto
Sure, it only took a few minutes; the function is...

Sure, it only took a few minutes; the function is unchanged from A01G to K00G. Let me know if you get any useful results?

In A01G, this boolean is at FFF8BE75.
In U01A, this boolean is at...
Forum: Software Tuning 04-09-2023, 11:42 AM
Replies: 270
Views: 84,061
Posted By callisto
S20G port injection ratio table

That FA24 graph reminds me of S20G's super fancy port injection table, which is way more complicated than S10C or U01A, so here's that. Different PI thresholds for this one - 10.0/75.0%, 6400rpm,...
Forum: Software Tuning 04-07-2023, 06:53 PM
Replies: 3
Views: 1,295
Posted By callisto
Thanks! I have Q00G on my list and I've started...

Thanks! I have Q00G on my list and I've started into S20G. I noticed the port injection ratio table in S20G is considerably more complicated than any other, as far as I've seen so far. I didn't...
Forum: Software Tuning 04-07-2023, 04:28 PM
Replies: 7
Views: 4,185
Posted By callisto
Subaru's OEM wideband front O2 sensor table (10.14 AFR) for any intake

Hi all, I've been decoding the red intake ECUs and one of the cool things I found is that Subaru has rescaled the Front O2 sensor down to 10.14 AFR. I know the community was trying to work out this...
Forum: Software Tuning 04-07-2023, 02:25 PM
Replies: 11
Views: 8,426
Posted By callisto
Disabling throttle deposit learning by lowering max ECT to -200.0

I've been reading the code for P1109 THROTTLE DEPOSIT MALFUNCTION and I think I know how to disable this now. (I don't endorse doing so, but I set out to learn how, all the same!)

...
Forum: Software Tuning 04-06-2023, 01:44 PM
Replies: 270
Views: 84,061
Posted By callisto
U01A safe tables include a cutout for the VVT resonance area around 5000 rpm

For those who are still studying 86 VVT, here's an update from the distant future of gen1.5 red intake ROMs: the intake tables are 3 rows taller, having been tuned specifically to reduce intake...
Forum: Software Tuning 04-01-2023, 10:25 PM
Replies: 1,093
Views: 511,957
Posted By callisto
Original ROMs for ZA1JS20G and ZA1JU01A00G

Hi, in my ECU research I've collected a bunch of stock ROMs, and I have two that aren't on the forum yet, S20G and U01A. Both are manual shift, red intake, and non-US.

ZA1JS20G says it's "AL7 H4NA...
Showing results 1 to 30 of 36
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