ECMLink Tuning Questions (Logs Included)

cman3000 · 05-29-2011

This is my first time tuning with ECMlink, or any other software for that matter. Right now I cannot get the AirflowPerRev over .11 without the car running like ass, I am sure it has everything to do with my fuel trims, global is likley off, but i couldn't get it right after playing with it for a while. Car runs good, but rich at WOT. Anyways here is some info and logs, I am sure that someone who is more expirienced than me will be able to spot my problem fairly quickly. Car is a 1g with MAP shortblack stage 1, E316g. E85 Fuel.

-Running PTE 880s
-Global fuel set at -13.3%, 420 deadtime
-37 psi base fuel pressure
-Evo 8 maf (combined ft gives me 50hz=-3, 150hz=1.6, 250hz=6, 400hz=12, 800hz=25, 1200hz and up=27). I am using combined ft settings.
-Wideband is an AEM uego, it is a full point off on the logs at WOT, about .1 off during closed loop (I was seeing 10.2-10.4 on the gauge during WOT in log 3, link was reading 11.3). Link doesnt like AEM widebands : (
-timing adj set at -2 up to 4000rpm, -3 for all the higher rpms
-fuel adj set at 0% to 2000rpms, -7.8% beyond that

I am sure I am leaving some info out, let m know if you need any other info.

Here are a couple logs
http://www.mediafire.com/?du33ngu33zzwo3l
http://www.mediafire.com/?dwwdg7izl4brn9u

**asshanson** · 05-30-2011

Your global fuel should be set to around -31% (880s on corn, divide by 1.35 = acting like 650cc injectors on regular gas. 450/650 - 1 = -.307%). Your fuel trims are probably running super negative trying to lean the car out, and explains why it's rich under throttle in open loop.

I would get your idle and cruising fuel trims all set before doing any more WOT pulls. Once you get that figured out then zero out the RPM based fuel adjustments and adjust from there doing pulls.

cman3000 · 05-30-2011

Well I figure my global should be -17.6 according to this equation, and the fact that PTE 880s actually flow 840cc (according to ECMlink wiki). I originally thought I had to compensate for the lower base fuel pressure in a 1g (37 vs 43.5 in 2g) after reading it in some thread, but I don't see anything about it anywhere else so I will stick with 17.6.

(450/(Injector Flow * .65))-1.0 = E85 Global

(450/(840x.65))-1
(450/546)-1=-17.6

I already adjusted that though, I think the source of my problem is the really low AirflowPerRev reading, it is around .13-.14 now. My car wants to idle at around a 12 afr. I did a boost leak test, held to 5 psi (all my crappy electric pump can pressurize it to) so I don't think I have unmetered air coming in.

What else could cause such a low airflow reading? Bad MAF maybe?

Edit: Also, could the ecu be putting itself in open loop during idle because of the low airflow readings?

**asshanson** · 05-30-2011

You're saying your "840"cc injectors are acting like 546cc on pump gas? That means they need to flow > 50% more gas to run e85 correctly, which is not the case. Have you logged your fuel trims to verify they're around 0 with that -17% correction? I did some searching, and almost every post says that 850cc injectors should be around -31% on e85.

cman3000 · 05-30-2011

http://www.jeffgst.com/e85global.html

That is where I am getting the equation from.

Also here

http://www.ecmtuning.com/wiki/baseinjectordata?s=e85

In the table at the bottom you will see it says ~-20 for 880s on e85

tpunx99GSX · 05-30-2011

Quote:

Originally Posted by cman3000

http://www.jeffgst.com/e85global.html

That is where I am getting the equation from.

Also here

http://www.ecmtuning.com/wiki/baseinjectordata?s=e85

In the table at the bottom you will see it says ~-20 for 880s on e85

Flip it to 31% and check, otherwise if you dont believe andrew, post it up on the link forums. they will likely say the same thing.
The reason your car is running like ass is that your fuel trims are not set properly to the global value you set. Doesnt ECMLink have some kind of thing where you tell Tom Dorris what you have and he will send you updated settings, or some kind of autotune thing? I thought this was part of the V3 updates.

cman3000 · 05-31-2011

I will try it today and see how it goes. It wasn't that I did not believe him, I was just setting it based on everything that I had read. I am not sure about sending Tom my info, and I have no idea where to check on this. I am running V2 with the ECMlink software, so if it is only something for users with V3 hardware, I may be out of luck.

tpunx99GSX · 05-31-2011

Quote:

Originally Posted by cman3000

I will try it today and see how it goes. It wasn't that I did not believe him, I was just setting it based on everything that I had read. I am not sure about sending Tom my info, and I have no idea where to check on this. I am running V2 with the ECMlink software, so if it is only something for users with V3 hardware, I may be out of luck.

Well if you PM Tom on the dsmlink forums or just make a thread on the tuning forum, state exactly what you have, and ask what your base settings for e85 should be, they will be able to help im sure.

**scheides** · 05-31-2011

Quote:

Originally Posted by cman3000

I will try it today and see how it goes. It wasn't that I did not believe him, I was just setting it based on everything that I had read. I am not sure about sending Tom my info, and I have no idea where to check on this. I am running V2 with the ECMlink software, so if it is only something for users with V3 hardware, I may be out of luck.

General rule of tuning: go with what works on your car, not what is published on the internet (although it can be helpful starting point)

cman3000 · 05-31-2011

Thanks for the responses guys. I set it to 31 and the AFRest is now a lot closer to what the wideband is showing. My problem now is that the car is stuck in open loop. Causes of that? Could I have fouled out my front O2? I can get it to cycle during cruise at some points, but during idle the car shows 0 on all trims and O2 will not cycle. I have adjusted the BISS, played with the MAFcomp settings, and double checked my fuel pressure(with vac line off).

**asshanson** · 05-31-2011

Sounds like an o2 issue to me. Do you have another you can use to verify?

cman3000 · 05-31-2011

Unfortunately I do not. O2 voltage is pegged at .82-.84 if that helps.

cman3000 · 05-31-2011

Alright so I got all the numbers around where they should be, besides LTFT which I cannot get higher than -4 at both mid and Lo. What is odd though is that in order for me to get AFRest to be the same as my wideband, my global is very low (-38) and my MAF comp is adjusted pretty high. When I tried to lower comp and raise global, AFRest gets way off. Even my Airflowperrev is in line now though. Maybe my local station is using e70? I will post up a log in a few minutes.

Edit: Link for log
http://www.mediafire.com/?he0vj1c2hyg7wf8

tpunx99GSX · 05-31-2011

I know this is kind of stupid, but i remember having an issue like this with my v2.5 dsmlink. Is your throttle position set correctly. i.e. when you foot is off the gas throtpos shows 0, and when you push to the ground (with car off) it shows 100?

cman3000 · 06-01-2011

Yeah, it is set correctly. The car will not idle in closed loop unless you drive it around for a few minutes. Is this normal?

bertrenolds5 · 07-02-2011

Did you set your car to open loop in version 2, there is a setting. Also when using an AEM wideband you need to get a buffer from ECM's web site and only connect the widebands sending wire to the ECU. Your not running power for the wideband off the ECU correct?
http://www.ecmtuning.com/wiki/ecuinputdata