need a tune + question

Just got done installing my LC-1. Haven't had a chance to log any afr data because it was being a huge bitch about connecting with the computer. finally got it to work, drove around a bit but wasn't actually logging and then the laptop battery died (i think the LC-1 got all confused from my multiple attempts to get it connected to the laptop - looking at the computer while driving it was jumping all over the place from super rich to super lean to no data. at idle it was in the low 14's but other than that it wasn't consistant at all).

So I'm looking for someone experienced with open ecu tuning that has some free time soon that would like to make some money - the sooner the better I currently have a base map that Nuke flashed onto the ecu for me a few weeks ago which came from www.osecuroms.org



i also had a question on how much oil blow by through the turbo is typical on an STi. I took the tmic off for the first time today and it had a little oil residue around where the silicon hoses connect with the intercooler. i remember my sr20det would get a little in the hotpipe as well - is this common with subaru's too?

 

U should PM walls of tv, he'll tune for you

i believe it's normal for some oil in the intercooler
getting a catch can, can help, i think

 

Yea, i was thinking that some was normal. if not, 20g! lol

 

I'm sure you can entice Tom (wall of tvs) with some money. :biggrin:

You should probably get a power converter for your car, along with a splitter to get the converter down on the floor and away from the shifter. That way you can run your laptop with the AC charger and not worry about the battery dying.

 

Oil in the FM and Y pipe seem to be pretty normal. If it makes you uncomfortable then you can install catch cans to filter it out.

 

Yes, def get a catch can. As the oil spreads it'll reduce the efficiency of your intercooler.

 

here's another question

on my afr logs everthing is right around the 14 range except when i let off the throttle. when i do that the graph will spike all the way to the o2's max voltage of 5V or roughly what it considerings the oxygen content of air from calibration. this only happens when you let off the gas. at idle it sits in the mid 14's. is this typical?

 

nvr mind, nasioc helped me out lol

 

Yeah, that's normal. When you let off of the gas, the car will basically shut off the injectors and the car will "run" leaner than 14.7:1.

 

Should his sensor be showing 14 most of the time? I would think it would run a bit richer. 14 sounds a bit high high for LBT.

 

Here I attached the log file.

edit, didn't work. invalid file type

 

i logged afr over time and it's hard to distinguish all the little lumps and spikes that showed up from partial throttle release. all i can tell for sure is that at idle it's around 14.5. average over 8 min 41.75 sec was 16. max 22 min 7 (which occured before the car was turned on)

 

Yeah, because most of the time you are driving around in closed loop and the car is trying to stay at 14.7:1.

If not, you have a lead foot, lol.

 

I thought he was logging for tuning purposes. I expected to see a lead foot.

And at wot, he should be shooting for 12.2.

 

What does that mean? Cars are cars, target afr's are for gasoline types. You only change a target afr if load condition changes, or you know something about that ecu/timing advance type.

 

Yeah, I'd like to know why Russ thinks 12.2 is a "blow up" ratio for a Subaru.

 

Because it is. Out of everyone on here Russ probably has the most experience in tuning Subarus.

You would be friggin' crazy to target that lean of a mixture on our cars at full boost/load.

 

hey Tom we still on tomorrow afternoon???

 

Okay, there's some miscommunication going on in this thread. The original poster said he was seeing afrs of 14. I thought that was too lean but nobody else said anything. If the stock, safe afr is 11, then yes, 12.2 is proly too lean for a turbocharged vehicle given that you want to slow the combustion charge. But how can a richer ratio of 12.2 be worse than the 14 the poster is logging? What is the stock afr?

 

Okay, you just answered some of my questions. But carl said he was seeing 14 most of the time, which I said I thought was too lean. Not knowing the stock afrs, I said he should be seeing something richer. So is his sensor misadjusted, or what?

 

i think that 11:1 is the target at wot. i don't have any comparison of my afr over time and throttle % so i can't easily pick out where my wot or near wot (don't think i ever went wot during that run) is.

from what i gathered, at idle or just driving normally the ecu is going for 14.7

 

I already answered your question.

Carl was probably logging his car while just doing normal everyday driving; ie, putting around town while in closed loop. Closed loop targets 14.7:1.

When you get on the go pedal, the car will switch over to open loop fueling and then use the fuel table as a reference -- ranging from 14.7:1 at very low load and then richening up as load & rpms rise. Under full load the car should have targets in that table <= 11:1.

 

lol, Carl types faster than me.

 

To quote the genie from Aladdin: He can be taught!

Okay, more things have been cleared up. Still some questions.

First, I can see that Closed Loop Target AFR is 14.7. Closed Loop Exits at 3750 RPM. Do you exit below 3750 with the Throttle, Throttle (Delta), or Load A and B (and I do not know what the direct ecu values mean)?

Second, since the stock o2 can't read much off of stoich, when it enters open loop it just follows the 2*g/rev table, right? It doesn't know what the afr is because it can't read it past a certain threshold, correct? Does the ecu compute the afr at all, or do we only know it because we compute it or measure it?

Now, if an afr of 10 is stock (and safe), why do you lean it out past 11 in certain aplications? The flame speed at 11 is ~80ft/sec, and it slows down before rbt or mbt, which seems to indicate 11 is a great afr for turbocharged applications.

And lastly, why are the dsm's better able to support a leaner afr, as you indicated earlier?

 

I was simply stating 12.2 is a "blow up ratio" a.k.a usually to lean for ANY boosted car on 92 octane, street car, IMHO.
Some C-16 cars don't even like it that "lean".

bikewriter-
DSM's do NOT like it at 12.2, I was mearly pointing out an erronous statement, by someone that doesn't have a clue about the subject at hand. (Unless it was a joke, then I appologize, cause I missed it).

Fuel is used for thermal cooling. Fuel is needed to keep combustion chambers in check. A "leaner" AFR seldomly results in an significant increase in power. If you do gain a significant amount of power by "leaning" out a car, something else is occuring. You are achieving better spark, you are gaining more timing because you are truely not controlling fuel, but hacking an airflow signal, or you were so damm rich, your rings could be washed out.

 

I didn't get the joke either. Russ should have added a :biggrin: for dumb people like me.

 

Alright then, it is agreed...more :biggrin: for Russ's posts!

:biggrin:
:biggrin:
:biggrin:
:biggrin:

 

:ugh:

I shouldn't be admitting this, but I could NEVER blow up an Evo (intentionally). I have always lusted after them, but just couldn't afford one. I still hope to get one someday. As long as they don't get ugly...