Ceddy

Has anyone found the Load and Injector PulseWidth Cap addresses in any of the 5 or 6 roms?

Also does the PulseWidth Cap only happen when you are near 380 Load or does Injector Size and other variables affect it?


I've tried finding them in the AirFlow routines, but there are 10+ AirFlow variables and the routines are huge.


Thanks much for any help.

crcain

Is what you are asking for the fuel cut? To prevent overboost basically?

Ceddy

No, the Load Cap limits your load to 380 max.

PulseWidth Cap limits your PulseWidth to some number, and will basically turn your Injectors off for a split second, creating a lean condition and detonation.


These are the only things that haven't been found on the older ecus, to make them usable on a high HP car.

crcain

What is the purpose of either of those things? What table defines the fuel cut / boost cut for Evo 5's and 6's... normally it is around 1.4 bar that you get fuel cut in a 6.

Creamo3

iTrader: (48)

Read through this thread for your answer and code to add to your XML: https://www.evolutionm.net/forums/ec...ng-guys-3.html

Ceddy

Boost Cut is around 200 Load. Boost Cut and Load, PW Cap are two different things.



Thats a good thread, unfortunately no Evo5/6 info in it. Because the 5/6 use a different processor its hard to match things up with the 8 code.

jcsbanks

I think I was the only one working on this area of the code for the 7/8/9. No one has done a serious disassembly of the 5/6. Most of the MLR guys are fitting Evo 7 ECUs for the better understanding/mods.

Ceddy

What strategy did you use for the AirFlow routines? I have all the addresses from the MUT table named, and have found the Injector Latency Lookup routines.

I've tried working backwards from the Latency Lookup, but haven't made good progress.

In the old 1G DSM code they do cmp to hard coded numbers, but I haven't found anything like that.

I'd like to figure this out a lot of cars use the H8 ecus, and I've heard some bad stories about the PW limit.


Thanks much for any insights.

RoadSpike

iTrader: (5)

Is it the same processor? I wonder if you could just update the rom to use an evo 7 file instead.

jcsbanks

Different processors.

My strategy was starting from a disassembly that lots of people had put work into and then spending three months going through the routine from the MAF pulse to the injector pulse. This is no small job!

You could start with interrupts as these process MAF or CAS pulses and then go through the code line by line.

nitz

iTrader: (3)

so if these caps exist, how come they aren't mentioned much when tuning 7-9 ecus. i've got my axis scaled out to 360 currently but still running lower boost. are the caps something i'd need to adjust eventually, or does it only apply to the H8 ecu's?

acamus

It is vice -versa it is known for SH2 but unknown for H8.
If you want some more info read thru https://www.evolutionm.net/forums/ec...eing-guys.html