stunt2

iTrader: (8)

logged trims today and got -9.7 Low and -9.2 Mid. STFT fluctuates between -1-2

I know that if trims are rougly the same but negative, should bump up scaling by the sum of LTFT mid + STFT. so by ~10% in my case

I have stock 560 injectors scaled to 513, and if I increase them by 10%, it puts me above rated (560) cc.

any suggestions what to do ?

car is 2.3 jdm evo IV, with usdm VIII ecu and injectors, IX turbo, S2 cams etc... running 96530706 v7 rom. below are attached my current injector settings

evo8426

iTrader: (27)

You have to be positive you do not have any exhaust leaks. You will be chasing your tail for hours/days if there is a leak before the o2 sensor. Same goes with boost leaks, you need to fix them as well.

mrfred

iTrader: (50)

intake and exhaust leaks should both drive the trims positive, but i do agree that its important to perform a boost leak test and if probable cause, check for exhaust leaks. if all good, then crank up injector scaling and decrease latency. i'd start with -5% on latency and +5% on inj scaling.

stunt2

iTrader: (8)

I'm 99% sure there's no exhaust leak pre O2 sensor. not quite sure about boost leak but will check it as soon as possible

I'll alter scaling/latencies by 5% as mrfred said and should I disconnect the battery after it to zero out the trims or just reflash and good to go ?

mrfred

iTrader: (50)

i don't think that a battery disconnect will zero out the trims on the 8 ecu. just flash and drive in stop-and-go traffic for 30 minutes.

stunt2

iTrader: (8)

it does actually

I've changed scaling to 532 and latency @14v 0.408
drove around 30 min in stop-and-go traffic and now Low is -8.5 and Mid is unchanged, same -9.1 there

wot fueling changed and leaned out by a whole point though

mrfred

iTrader: (50)

Do you have your fuel pump "rewired" to be a full voltage all the time?

stunt2

iTrader: (8)

yes, it's rewired

mrfred

iTrader: (50)

That's your problem. The fuel pump is overrunning the return system at idle and cruise. Drilling out the siphon to 3 mm might help, but in my estimation, it doesn't solve it entirely.

stunt2

iTrader: (8)

and why is the wot fueling way leaner than in map ? by a whole point or maby even for 1.5

I was going to start the tuning of the car and wanted to bring the trims between sensibe %'s in first turn. but I'll disregard it, if they won't affect my wot fueling and just live with it

mrfred

iTrader: (50)

The reason is that the fuel trims do affect WOT fueling for the stock fuel trim control range. There is at least one thread describing how to tweak the settings. That's not the way to fix the effect of the hardwire though.

Fast_Freddie

iTrader: (50)

I thought the fuel trims trims only effected the Xs at WOT fueling...

mrfred

iTrader: (50)

8/9 as well. There is a table that defines the airflow Hz range over which the fuel trims operate. The stock setting allows the cruise trim to affect fuelling all the way up to 1600 Hz which is a pretty decent amount of airflow.

Boosted Tuning

iTrader: (12)

Fuel trims do NOT affect WOT on the 8/9s. Only on the X's.

OP, Raise your scaling by 2-3 "steps".

mrfred

iTrader: (50)

The fuel trims absolutely do affect WOT fueling in the 8/9. Read my thread on the fuel pulse calculation, and if you don't believe it after that, its quite a simple matter to verify it by logging AFR with a mid (cruise) fuel trim that is strongly negative or positive. Assuming the fuel trim operation range is at its stock setting, upon crossing an airflow of 1597 Hz, there will be an obvious step-change in the wideband reading.

https://www.evolutionm.net/forums/ec...l-options.html