You don't have a problem if that's your trims.

 

Serious, I was really worried about the O2 Feedback. The car starts good, but I have to blip the throttle to get it to start a good idle. I always wants to start that lean crap and sound like I have huge cams, nothing a throttle blip can't fix though. Thanks for you input..

 

It has the huge cams lope because it's running lean. It's running lean on start-up because it's in open loop and the Injen intake pipe without proper MAF tuning (and increased rpm idle speed) is causing it to do so. It also causes O2 feedback swings and AFR swings at idle in closed loop.
With your power levels i would recommend using a stock rubber intake pipe instead of Injen if you want smooth low idle with steady AFR.

 

Scaling affects everything equally. 10% change is 10% change.

OK, I was finally able to open your log. I have a quick question for you. Did you happen to mess with your MAF scaling table at low Hz values at all? You seem to have abnormally high airflow readings, and thus IPW readings at idle, which might be part of your problem. The STFT (02 feedback) doesn't even register until your blip the throttle, then it's very negative (pointing to the need for a higher scaling).

 

So I should scale the MAF? I can find the post and read and figure it out. I apperciate your help..

 

It will only register if I blip the throttle a little, other than it stays pegged at .1008. And yes the rear O2 is disabled via Tephra mods so that the LC1 can be logged directly the ecu.

I have logged other Evos' trims with the the rear O2 disabled without problem.


I haven't yet started scaling the maf because of the trims not registering. Suggestions?

 

It's just unusual that your MAF reading was so high at idle, corresponding with your higher than usual IPW. This may be part or all of your problem.

But since you only changed your injectors and since you haven't touched the maf scaling table yet, then I wouldn't worry about messing with that yet, unless you did change something in your intake setup the same time that you changed to these injectors?

If not, for now, just go ahead and start increasing the injector scaling to see if you can get trims to start registering at least. You're running way too rich at idle. If it turns out that it's just idle that is the problem or that something is screwing with the airflow reading, you can scale the maf and redo the injector scaling/latency afterwards.

 

Well I just completely rebuilt the motor for the customer but, used the same intake although it was never scaled (at least to my knowledge). I'm sure it needs to be scaled but, without trims reading I can't scale the MAF (at least I don't think I can).

I'm going to play around with scaling figures tonight and will report back.

 

Well, that may change a lot of things. Was the motor rebuilt to the same specs as stock (same compression, 2.0L, etc)?

Anyway, you may not have an injector problem at all then. It may be a maf or airflow reading problem. You can scale the maf without having trims if you really wanted to. You just won't know the exact numbers to scale to, unless you compare IPW setting from before and after, but since this is a brand new build, you don't really have that.

What I recommend is to simply increase the injector scaling more, to see if you can start registering some kind of trims, then work on the maf scaling from there, if need be. Of course, this is all assuming that the maf is reading properly and anything that may cause a mis-reading is fixed.

Also, you may have already done it, but make sure there are no boost leaks as well.

Also, another thought it to simply use the old injectors to see if you have the same problem or not. If you do, then you know that something else is awry.

 

I scaled the MAF at an idle, and the Fuel Trim Low cycled to -3. I also smoothed the MAF table and am expecting the Fuel Trim Mid to be around the same tomorrow. Thanks again for you help..Also O2 Feedback, came off +20 and is now around +1 or .0..car started better and idles fairly well, considereing the BC 272's, don't mind a little lope

 

This car has been a nightmare from the get go but, the guy got it dirt cheap (now he knows why even though I warned him ). Anyway, I rebuilt the motor to stock specs just upgraded components. I wish I could use the stock injectors but, it never came with them.

I had already checked boost leaks as that was something I thought of as well but, its worth another check.

In order to scale the MAF without trims how would I go about doing that (ie. what data from the log would need to be referenced {if their is a thread somewhere by all means please link me to it, I wasn't able to find anything}).

Well, I'm going to check for boost leaks and than re-scale. I'll report back in a few.

 

Well, if you want to try the MAF scaling route, then start by lowering the numbers in first 4 or so rows (the numbers on the right).

What was weird though is that the airflow numbers at ilde in your log were well above what I would expect. Are you sure the maf is good? Was this car running right before the rebuild or were there major problems then, too?

It's hard to suggest what to do when there may be more than one issue.

 

Re-enable rear O2, your trims will most likely start registering again.



Good stuff, man

 

Quick question - when going back to stock injectors from larger injectors I assume it will take some time for the ecu to adjust trims according to the OEM latencies/scaling? Meaning alot of idle time and cruising in order for the trims to come in line?

 

Assuming the installation will be done with the battery disconnected, the trims will be reset to zero. It's won't take long for them to be set again. 5 min of idle and 10 min or so of cruise should do it i would imagine. Why are you concerned about the time it will take though? It's stock injectors with factory settings.. no need to worry about anything.