EcuTek Unable to Increase Load Limits

[Td-d]

The engine load limits are all stock - labeling them Racerom doesn't change that There are multiple load limiters in the stock logic.

@brn12345 - here's your problem (well, this and table B):

ROM:000CA174 Table_Engine_Load_Limit_C_Maximum_RPM:.data.w 9 ; DATA XREF: sub_4A79A+328o
ROM:000CA174                                         ; sub_4A79A:off_4AC70o
ROM:000CA176                 .data.w h'800
ROM:000CA178                 .data.l Engine_Load_Limit_C_Maximum_RPM_Y_Axis
ROM:000CA17C                 .data.l Engine_Load_Limit_C_Maximum_RPM ; = 8.8e-1
ROM:000CA180                 .float 0.000061035156
ROM:000CA184                 .float 0.0

ROM:001044FC Engine_Load_Limit_C_Maximum_RPM:.data.w h'3852 ; DATA XREF: ROM:000CA17Co
ROM:001044FC                                         ; = 8.8e-1
ROM:001044FE                 .data.w h'399A          ; = 9.0e-1
ROM:00104500                 .data.w h'38F6          ; = 8.9e-1
ROM:00104502                 .data.w h'3AE1          ; = 9.2e-1
ROM:00104504                 .data.w h'3AE1          ; = 9.2e-1
ROM:00104506                 .data.w h'447B          ; = 1.07
ROM:00104508                 .data.w h'470A          ; = 1.11
ROM:0010450A                 .data.w h'4666          ; = 1.1
ROM:0010450C                 .data.w h'5333          ; = 1.3

[jamesm]

i think you'll find that modifying those stock tables doesn't actually do anything, hence the need for the racerom mod. at least that's my understanding of it. regardless, it's not long after you hit those that you'll be needing things like SD and a way around other, less documented limitations .

[Td-d]

Chuckle, come on, you've got to give me a swipe ever once in a while

Yup, I've had an offline about the load issue with other members on here - but in brn's case, I'm betting it's not a coincidence that it's capping at 1.3 - which is the maximum in a number of load limiter tables. I haven't specifically looked at it, and there are at least 5 tables / limits that affect max load (RPM, atmospheric, absolute limit, intake temp comps). And the 'Racerom' load table is definitely OEM - check it out, compare the values. RPM to engine load, 800 to 3200 RPM, cap of 0.88 to 1.3. Sound familiar?

But absolutely, you're going to need some proprietary logic / tables to deal with the requirement for FI, which this ecu was not set up for. In the absence of what I would consider the best route, which would be the porting of turbo'd vehicle logic (Subaru or custom) over to the rom (which is totally doable - Carbibbles has done this extensively for the CarBerry rom), the custom tables definitely provide a lot of flexibility.

[jamesm]

I'm fairly certain that the racerom load limit is separate from the stock one, but I really don't know as I've never looked too far into it. The benefit of ecutek is that it's a layer of abstraction between me and all that stuff: it just works, and I don't really have to care why lol.

[Skorov]

Looks like I'll be buying RaceROM. I don't mind at all. It's well worth the investment. I'm just surprised that Ecutek doesn't offer raising load limits when BRZedit does.

Another thing... how are turbo vendors offering a base map without RaceROM? Are they running the engine lean due to the load limit?

[jamesm]

They're not, at least not that I've seen.

[Sportsguy83]

Originally Posted by Skorov

Looks like I'll be buying RaceROM. I don't mind at all. It's well worth the investment. I'm just surprised that Ecutek doesn't offer raising load limits when BRZedit does.

Another thing... how are turbo vendors offering a base map without RaceROM? Are they running the engine lean due to the load limit?

Ecutek tuners get RaceRom by default, then they can create a basemap with the features and it can be flashed on any car. End users need to get racerom in order to DIY tune with the features.

[Skorov]

Ok. So the load limit can be fixed with RaceROM.

What about the PI/DI ratio? The logs paint a different picture to what is in the table. Sure, there might be some discrepancy in the result, but I'm seeing the PI at 0ms where I command 25% even below load of 1.3. Is there a way to test this to ensure that its working correctly?

[jamesm]

I've never noticed any weirdness with the pi ratio. I have heard others talk about seeing weird things around there though. It always seems to do what I ask it to, so I'm really not sure. I think @nelsmar mentioned seeing some odd behavior before.

[brn12345]

Originally Posted by Td-d

Chuckle, come on, you've got to give me a swipe ever once in a while

Yup, I've had an offline about the load issue with other members on here - but in brn's case, I'm betting it's not a coincidence that it's capping at 1.3 - which is the maximum in a number of load limiter tables. I haven't specifically looked at it, and there are at least 5 tables / limits that affect max load (RPM, atmospheric, absolute limit, intake temp comps). And the 'Racerom' load table is definitely OEM - check it out, compare the values. RPM to engine load, 800 to 3200 RPM, cap of 0.88 to 1.3. Sound familiar?

But absolutely, you're going to need some proprietary logic / tables to deal with the requirement for FI, which this ecu was not set up for. In the absence of what I would consider the best route, which would be the porting of turbo'd vehicle logic (Subaru or custom) over to the rom (which is totally doable - Carbibbles has done this extensively for the CarBerry rom), the custom tables definitely provide a lot of flexibility.

I have spent some time looking through all the tables I could and your absolutely right. Most tables cap at 1.2 and some at 1.3. I have attached logs I did a while ago and you can clearly see how engine load stays static in the higher rpms. In the first picture the engine load goes static at 1.33. In the second picture it pegs at 1.257. The difference between these logs I had attributed to air temp difference (one was take at 37deg C and the other at 20deg C ..... See the link below for a separate post on air temp)


http://www.ft86club.com/forums/showthread.php?t=64726



Now since in both cases the engine load goes static around 1.3 g/rev , there must be a additive applied to a "Maximum Engine Load" value. If we can find these additives then we can figure out high RPM compensation tables which might or might not be defined as of yet.


As a test this weekend, ill try changing the Engine Load Limit table maximum value from 1.3 to 1.4 and I will log. Don't know what this will do since the car in this hot weather doesn't want to go higher than 1.3 but maybe it will have an impact and I will report.

@Td-d you mentioned earlier "Engine Load Limit C" as a table. I can only see Engine Load Limit A & B in the software I use. Can you confirm if there are additional Engine Load Limits other than A & B?

[wparsons]

Really big long shot here (and no access to software, or a ROM to open up at the moment), but how high does the stock MAF scale go? In theory if the MAF voltage is off the scale it would just peg at the highest known value until the voltage drops down into known values again?

[Kodename47]

Originally Posted by wparsons

Really big long shot here (and no access to software, or a ROM to open up at the moment), but how high does the stock MAF scale go? In theory if the MAF voltage is off the scale it would just peg at the highest known value until the voltage drops down into known values again?

Stock scale is 0.8984375v to 5v but the stock g/s limit is 200 (which is about 4.5v on the scale). There is no way you'd hit 200g/s though unless you went crazy with the scaling, but then you'd be running mega rich. 160g/s is about max I'd ever expect to see NA.

[wparsons]

Figured it was a longshot, I just couldn't remember how high the stock scale went.

[Kodename47]

@brn12345 WRT the Load tables, I'm guessing there is a master load limit and then 2x tables as shown there. That's how I have it on ECUtek anyway.