I have a feeling that there is decel/accel resume corrections, as in injector latency.
I feel that they spray too much too quickly sometimes and the engine wants to jump forward instead of smoothly accelerate.
People have mentioned similar tables in other roms... I'm sure there are lots of features not yet discovered!
Have a read through that thread I linked above. Got the gears turning in my brain reading it. The solution all speed density issues should be fixable with the extra fables he mentioned, this would also improve driveailty on MAF too.
I just want to ask it in plain english - I have evo7 ecu with matching 399 MAF and 560cc injectors w/factory resistor pack. I shouldn’t have to make any maf scaling adjustments should I?
Motor is 4g94
As the MAF matches the ECU values, it should all be fine. The engine could be super down on power/vac, or had a rod out the block, but as the MAF is feeding a correctly scaled airflow value to the ECU, in the format that the ECU is expecting, it's all okay.
Found this post of yours;
This happens on the OEM standard ROM as well - its low load and high rpm (higher than normal expected cruise/higher than normal fuel decel enable), and high timing.
I expect it there is a hysteresis setting for this which would contain Load (which from memory is calculated from RPM x something else?) and Speed;
when on decel with the TPS open it still hits values in the timing maps, but as load starts to equalise/slow down from cell jumping, fuel cut overrides this until the fuel enable rpm is reached
Inadvertently came across some info relating to the MAF’s we use. I don’t know how useful this is to others but it’s super important for my troubleshooting.
The 399 MAF has been used in turbo and non turbo NON EVO lancers with varying success. As it is the highest flowing stock MAF from Mitsubishi, it struggles with lower idle speed readings. The smoothing becomes very important when trying to correct idle. Some people use stock values from 8/9 EVO maps with no problems. I, like others have done the same HOWEVER have not had entire success. The cold start is okay, driving is okay, but at idle the AFR starts at 14.7 and gets richer over a period of 15-20 seconds. Then jumps back to 16ish, settles on 14.7. Cycle repeats. As this goes on, the fuel trim readings follow the AFR. Ie as it goes richer the trims try to lean it out and when it goes lean, the ecu tries to trim it rich. At 14.7, near 0 trim. So the ECU see’s and “knows” that it’s doing wrong, but even so, cant compensate correctly.
This should be solved with a bit of trial and error with smoothing tables. It had also been said that using the tables from a 482 maf can cure this. When I’m up and running again, I will update.
Originally I thought this was injector fault, air leaks or fpr fault. MAF makes more sense looking at the fault pattern entirely
You just save the rom as another name. Before doing any edits its best to save the original.Hey gang, I have an interesting question ....... what are the limitations of retuning the 4G93 (plastic case obviously) ECU? what can't you reflash tune after modifying? Ie cams? Turbo? Throttle body? the number of throttles? add or subtract sensors etc
Hey gang, I have an interesting question ....... what are the limitations of retuning the 4G93 (plastic case obviously) ECU? what can't you reflash tune after modifying? Ie cams? Turbo? Throttle body? the number of throttles? add or subtract sensors etc