yes i have been all over the biss screw.

yess it runs very rich when it dips around 10.0-10.4 but just for a second or 2.


Also noticed that when logging maf hz the value doesn't change very much or very quickly like just now it was at 43.8hz while driving and i got on it more and revved and nothing happened. just stayed at that value. even when i pulled over -__-

im goin to throw then stock lancer one back in and test.

evo pete let me know on the maf scalings and smoothing at least the first 3 boxes on each. i have pretty well got mine set spot on or so i thought. im running 880cc wrx injectors and aluminum intake pipe coming off the maf so idk how much of a difference that would make

 

well just tried the stock lancer maf and it didnt do any different. its weird that it was just stuck on 31.25hz according to evoscan...

 

what would effect the maf hz not changing? is there times when the maf isn't used??? ahh this is drivin me NUTS

 

Just switch your ride over to SD and do away with the maf. In my opinion it was the best thing I did on my turbo setup. But thats just my opinion.....

 

I don't know for sure if that would even fix the problem tho. And im just getting really sick of this car i dont want to keep dumping money into this thing

 

Did you accidentally tick maf scaled in evoscan instead of regular maf or some other maf reading?

Maf should always register.

 

I know the feeling. I'm taking burners advice. But after that I have a limit on money I'm willing to spend.

 

I have been using "Air Flow Hz" to see the maf intake and tune scaling and such but its usually stuck on 31.25 now.
it sometimes moves and sometimes doesn't wth is going on here. also when i first start the car and i rev it there is no dip or die.

 

Might wanna check the wiring for breaks

 

I did it looks fine :/ maybe there is a way to test output in the FSM

 

hmmm found out when i idle my afr map bounces around 13.8-16.8-17.1 even tho in my tables i have it set to 14.7? this is in forced open loop only. it makes for irratic idle any ideas?

 

Likely causes besides actual machanical issues like vacuum leaks etc.

1) Maf smoothing not at acceptable levels in idle region. At slow engine speeds a MAF really isn't that great of a tool to measure airflow its just not enough movement to read properly. Idle afr is better set in this region by Maf smoothing/compensation.

Set your scaling to percent 128 so you can see the real values on the right hand side and get a proper maf hz on the left hand side. The first two should be 19hz and 25hz followed by 50hz. What you usually see is maf smoothing set to about 100% for most of the range except idle where it will dramatically drop since the sensor can't truely pick up an accurate reading we fake the load with this table to adjust the fuel input. The idle will improve greatly then.

2) Injector latencies, since at idle the pulse injector width is soo impossibly low to account for the really miniscule amount of air ingested the inectors themselves start being effected more on the time it takes for them to actually open then the size or scaling of the injector. At this point the ecu is adding as much time to open the injector as its calculating the pulse will be. So latencies become super critical when dealing with idle AFR. Generally you deal only with the 14 volt section of the injector since thats where the car will normally operate. Once you get it tuned graph it and curve the rest in relation to your new point.

3) MAF sensor interference. Our maf sensors are the type that measure air by measuring the pulses that occur naturally when laminar airflow, straight flowing air, is interrupted by an object like a flag pole. And just like a flag pole in the wing vortexes will develop in a waving flag pattern and the speed of the flapping motion determines air speed in the MAF. As you may expect ANY interference will cause massive distortion in this device. This is why certain intakes cause huge issues with these cars as the disturbed air which normally pulses in at intervals tumbles around making the sensor see things that aren't really happening. At higher speeds this could lead to abnormal load spikes and at low speeds wandering AFR's.

I had an issue like this with an intake i liked at idle only and solved it by faking the airflow. I first evoscanned the idle range with airflow hz and AFR. Then I rescaled the maf so that the first two columns were in my airflow range. I set the low parmeter to 25hz and the high to 45hz which was just above idle and set both scalings to the same value effectively locking the load in place even though the sensor was wandering. This stopped the fuel pulses from changing. Then a bit of smoothing to adjust the fuel to the desired afr fixed it for good.

 

ok and those would effect "AFR MAP"? because i thought when logging AFR MAP it was displaying exactly whats in my fuel tables??

and nowhere do i have 13.8 16.8 or 17.1 in my tables near idle loads? and it only does this in forced open loop so i can't very well get a good scaling going for my maf at idle.

 

Ah I seemed to have misread that part. No that shouldn't happen AFR map should read from the tables only. Its extremely odd your seeing values that aren't in your map.

I can only think of a couple possibilities.

1) The rom definition you have is off and so the values you see aren't really in the table perhaps they are close but offset by some degree.

2) A logging issue were the AFR Map isn't using the right logging address and your seeing values which don't relate to AFR Map anyways.

 

hmmm its just so odd because it doesn't stay at one number... afr map and wideband both rpms jump up and down as well. and thats only at idle with my foot off the gas. and it's only in forced open loop.

how can my afrs bounce 13 and 17 back and forth on afr map so abruptly when the car is just sitting there.. you can hear it changing. it makes it impossible to scale maf at idle. there has to be an explanation as to WHERE evoscan is reading the 13,16,17 numbers from. because they are not from my high/low octane fuel, alt map, or launch...

also just curious when i rev the engine and let off the wideband reads from idk 13afr then to full lean (cause i let off) then full rich 10afr. is that normal? its always been like that and just figured the fueling is trying to catch up? or maybe thats why it dies on the revdown sometimes because it bogs out


thanks roadspike for your input. your responses always get me thinking and analyzing more aspects