If your injectors are scaled properly and tightly in fuel trims does that mean you will see an approximate afr reading near stoich? I ask because I am having a very hard time scaling my pte 1000cc injectors . I also rescaled the ~v table to match what pte had sent me for latency times.

It definitely acts like when my injectors get closer to 0 fuel trims that the car will not be any closer to stoich at idle. The problem here is my cams and I have tweaked my sd map a bit and does t ever change . I idle at ~16.4

Also does your ve table effect closed loop?

 

i wouldnt be to worried about your idle afr as much as your wot afr

 

Im definitely worried. I am trying to dial my car in thoroughly. Have been trying to for a while. And I dont want open loop idle so.. I just cant live with that dont worry about it mentality. Im trying to get good at this.

 

VE does affect everything.

Adjust your maf comp on the two lowest cells (19 hz and 25 hz) a bit until you get stoich if you have to make HUGE changes to the VE at 500 and 1000 RPM.

If your trims are close to 0 at idle yet your WB02 reports 16's, you may have a bad/miscalibrated WB02 or a bad upstream O2 sensor. The EVO ecu is pretty good at getting stoich AFR's when the trims are close to zero at idle. Just saying .

 

Im here because ive used the AEM uego and LC1, on top of two brand new OEM replacements. This has been goin on for a couple years now and Im kinda at wits end getting the fuel map dialed in.

I can dial my VE in to get stoich real easy but once I enable CL its maxing trims easily.

I DONT understand a negative fuel trim low, on top of a lean AFR. Why would the ecu be pulling fuel only to accomplish getting a lean value????

 

Do you have some logs and possibly screenshots of your rom?

I have both the UEGO and LC1 and I agree they are both accurate for what we use them for and dialing in this stuff.

 

Sure, which screens would you like to see? Im gonna go try another rom with the MAF comp adjusted like you say. I added some fuel at low HZ ranges, but wont that just make it want to pull more fuel in the end?

 

heres a couple

I have these latency values in an E-Mail from PTE. They supplied the voltage vs ms and I entered that explicitly into ecu flash today.

 

this is the latency which yielded this log. The data in this ROM was previous to the rom posted above.

Yes I modified the voltage scaling in the above post per PTE's recomendations.

 

I wish this were the case with 100% of the injectors out there. It seems our ECU needs more fine tuning as there are a lot of factors and off the shelf standalones deal with off the shelf latency values better from what I am told.

1) you can adjust your MAF COMP a little (lot) more that you have done.

2) try my latencies for PTE 1200's as a starting point which net me excellent drivability and idle (even on e85) get ready for a retune lol. if your happy with your current tune, just work with your MAF COMP values until you/the ecu finds stoich. then adjust your VE, fuel, and load to open/closed loop tables to dial in the tip-in. also, verify your exhaust is well sealed as a pinhole downstream will affect the upstream readings at idle more than one thinks:

3.312
2.184
2.088
1.296
0.792
0.72
0.48

scaling: 1044 (you will have to go down on this as per the 1000cc/min rating).

Good luck man. Idle and tip in took me a while to dial in on my EVO.

 

When you are in closed loop at idle and it seems to be stabilized, what does your Wideband read? I see variances between wbo2 and the front o2 trims all the time when people have small exhaust leaks anywhere from the o2 housing to the Wideband sensor. If the gasket between the turbo and o2 housing is leaking, your front o2 sensor AND your Wideband will be reading incorrectly.

-Jamie

 

heres what im using for pte 1000 on sd , i had to raise the first 4 values in the maf scaling table to get it to 14.7


914 cc


3.312
2.088
1.392
1.056
0.816
0.672
0.552

trims within + / -3%

 

Consistently in the mid 16 range but after a short cruise it hunts around stoich an trickles back to mid low 16


Todd's settings and advice seems to be where I'm headed which is close to what evoredy said too

 

My evo did that when I had a hairline crack in the header right at the collector. It made me go crazy. I had lean tip-in like crazy too. Any puff of air in the header/turbo area will do it no matter how small. I actually feel with my fingers at idle when I'm sketched out now heh. Inspect inspect inspect.

But really, good luck...seems like you have a good plan and someone with PTE 1000cc injector experience. Now I'm gonna shut up and go ebay an e85 content sensor lol...

 

If your STFT is stable and your AFR is still in the 16's, you definitely have an exhaust leak after the front O2 sensor.