WRX: Per Gear Wastegate Compensation

[JRSCCivic98]

OK, so we're not talking about the same thing then. Updating the ROM on a similar year ECU is nothing special. It's done all the time whenever a dealership updates your ROM version (if it's needed because of some update). So running the latest 03 USDM ROM on a 02 ECU isn't going to break anything. The real question is if we can take a EDM ROM and flash it on a USDM ECU and have it function.

[Tea cups]

I'm wondering how doing this could cause a dead ECU? As long as the ECUflash's flashmethod of the ROM you want to flash is the same as your current ECU, you should be allright, right? For example, the A4TE300D UK version has a flashmethod of "wrx02", the same as all the USDM 02-03 WRXs. So, you should be able to flash it to your 02-03 USDM WRX without killing your ECU. It might not run and/or it might throw CELs due to different sensors, etc., but it should not make your ECU unflashable, right?

[JRSCCivic98]

I'm talking about taking the current EDM flashes and putting them on a matching year ECU, as in 04 to 04 and 05 to 05. Seems though that the older 02-03 USDM ECUs might not have any issues running the new 04+ EDM ROMS. Something tells me that the EDM ECUs probably didn't change since 02.

[Tea cups]

I'm talking about taking the current EDM flashes and putting them on a matching year ECU, as in 04 to 04 and 05 to 05. Seems though that the older 02-03 USDM ECUs might not have any issues running the new 04+ EDM ROMS. Something tells me that the EDM ECUs probably didn't change since 02.

I know what you were saying. I was just making the proposition for us bugeyes as the 02 EDM A4SE700D/900D don't support per gear boost/WG compensation. The A4TE300D does and the flash seems to be compatible with the 02s. The only non-USDM that has the wrx04 flashmethod in Ecuflash is the ADM A4TH100H, but it doesn't appear to have the per gear compensation anyway.

[JRSCCivic98]

Maybe we need to find out from Colby what the major differences are between the 02-03 flash methods and the 04+ ones. Does the flash method need to correspond somehow with the data or is that strickly something just used for interfacing and uploading the kernel? If they don't have to coinside and we're going to start flashing different ROMs on different ECUs to get what we want then it's going to be imperative that he change the way the flash methods are currently being implemented (take them back out of the xml and put them back as a menu choice).

[Tea cups]

Maybe we need to find out from Colby what the major differences are between the 02-03 flash methods and the 04+ ones. Does the flash method need to correspond somehow with the data or is that strickly something just used for interfacing and uploading the kernel? If they don't have to coinside and we're going to start flashing different ROMs on different ECUs to get what we want then it's going to be imperative that he change the way the flash methods are currently being implemented (take them back out of the xml and put them back as a menu choice).

I'm pretty sure if you change the flashmethod to something different that what your ECU is, regardless of the map that is flashing, that you will end up with an unreadable ECU. Not sure what happens if you use the correct flashmethod for you ECU, but try to load a map that is designed for ECUs with a different method.

I hope Colby will chime in here. I'm itchin' to load the A4TE300D on my 02 USDM WRX. I just don't want to do it if I'm going to kill my ecu. If it will flash and not prevent me from flashing in the future, then I'd flash it and take it slow. See if idles and see what CELs come up. Probably turn off boost control and drive it around a bit. It would awesome to bump up the wastegate duty in 1st-3rd and pull it in 5th. Super-fast spool without out spiking in 5th!

[mattims]

it certainly does make boost tuning really easy. I tuned the boost from 0.7 bar to 1.1 bar on my car in about 2 flashes (and this was the first tuning i had ever done) simply by raising the wastegate duties nearly to max so it would hit it in 2 second gear and the take about 10% of in 3rd about 15% in fourth and 20% in 5th. Its a very useful table. It also comes with a boost target compensation table (which from factory reduces boost in 1st,2nd and 5th) i removed it from 1st and 2nd and left the reduction on 5th. Car pulls away much better now and i have no spiking issues in 5th (i actually hit my highest boost peak in 3rd)

[Tea cups]

it certainly does make boost tuning really easy. I tuned the boost from 0.7 bar to 1.1 bar on my car in about 2 flashes (and this was the first tuning i had ever done) simply by raising the wastegate duties nearly to max so it would hit it in 2 second gear and the take about 10% of in 3rd about 15% in fourth and 20% in 5th. Its a very useful table. It also comes with a boost target compensation table (which from factory reduces boost in 1st,2nd and 5th) i removed it from 1st and 2nd and left the reduction on 5th. Car pulls away much better now and i have no spiking issues in 5th (i actually hit my highest boost peak in 3rd)

Now you're making me drool.

paging Colby...

[dudical26]

it certainly does make boost tuning really easy. I tuned the boost from 0.7 bar to 1.1 bar on my car in about 2 flashes (and this was the first tuning i had ever done) simply by raising the wastegate duties nearly to max so it would hit it in 2 second gear and the take about 10% of in 3rd about 15% in fourth and 20% in 5th. Its a very useful table. It also comes with a boost target compensation table (which from factory reduces boost in 1st,2nd and 5th) i removed it from 1st and 2nd and left the reduction on 5th. Car pulls away much better now and i have no spiking issues in 5th (i actually hit my highest boost peak in 3rd)

What year and model is your car?

[Tea cups]

it certainly does make boost tuning really easy. I tuned the boost from 0.7 bar to 1.1 bar on my car in about 2 flashes (and this was the first tuning i had ever done) simply by raising the wastegate duties nearly to max so it would hit it in 2 second gear and the take about 10% of in 3rd about 15% in fourth and 20% in 5th. Its a very useful table. It also comes with a boost target compensation table (which from factory reduces boost in 1st,2nd and 5th) i removed it from 1st and 2nd and left the reduction on 5th. Car pulls away much better now and i have no spiking issues in 5th (i actually hit my highest boost peak in 3rd)

So, is the first value in the tables 1st gear?

[ev8siv3]

Can you post your modified ROM or screenshots of the per gear tables you've modified to achieve these results?

[mattims]

sure .. here it is with the xml for ecuflash.

[Tea cups]

OK, so I'm seriously thinking of trying to flash a A4TE100G (EDM 03 WRX) ROM on my 02 USDM WRX. Anyone want to talk me out of it? The flash methods are the same ("wrx02"). I just don't want to fry my ECU in the process.

[Spiider]

I did the same thing on my JDM ah581 ecu. I flashed in a newer ecu from an '05 JDM STi RAC because I liked some of the tables etc, and it just resulted in an unstartable car.

My ecu was reflashed back to ah581 as easily as any other time I reflashed it. It just took longer because so much rom needed to be rewritten.

[calvinc]

i think if you can get the ECU I/O pinouts for both the source and target ECUs and they match 100% then you should have no issue.

i have tried to flash the following to my ECU (MY05 AUS/SA STI)
- JDM MY03 STI TYPE RAC AH591 A4TE002C
- JDM MY05 STI AJ810-8801 A4TJ111B
- JDM S203

flashing took long because so much of the rom is different but with each rom i was still able to start the car and drive it...HOWEVER...once driving there was a permanent CEL (P0350 - ignition coil primary/secondary circuit) and AM would drop straight to 0 when you applied the slightest boost.

i think there is definately more to this than meets the eye although it does appear simple enough. that said i have not managed to find the ECU I/O pinout diagram for any of my source ECUs i wanted to use.

calvin.