RomRaider

Logged a friend's car tonight, got a Learning View out of it:




His is a local pro-tune, plus a lot of mods.

My question is, why are his AF #s in red and negative, while mine have always been positive and blue?

Which is better? Ideally you want them at black, within the specified range, no?

I'm guessing his Pro-tune has something to do with it vs my Cobb OTS maps, yea?

Obviously I know there is probably a huge difference in mine being a 16bit 2005 drive by throttle 2.0 engine vs his 2.5 drive by wire 2006 32bit ECU, but I still want to know about the AF numbers...

You just want them close to zero, it doesn't matter much whether they're positive or negative.

Positive is slightly better than negative for the upper range, but as long as the number is within a couple percent of zero it doesn't matter much.

Wow so mine being 10, 11, 12, and beyond has got to be bad... bummer.... I must be running really lean... i have no idea how to correct that

Your car displays symptoms of a post-MAF intake leak. Under vacuum (closed loop), unmetered air is being drawn into the system, and the ECU must add fuel to compensate (positive correction numbers). In general, being with +/- 5% of 0 is "acceptable" for a custom tune, but the closer to 0, the better.

Ah, interesting. Cobb tuning tried telling me that either I must have an aftermarket intake (even though ironically the SPT intake for example is almost identical to their Cobb intake, which is acceptable to use with their maps they say) or that my MAF is dirty and that is the reason for my running lean. I told them that I do not have an intake nor is my MAF dirty. I made extra sure to clean it very well, not that it was dirty to even begin with. I have run a pre-turbo boost leak check with no leaks present. I even swapped out the IC hoses with some Samco ones because I thought I had a little tear in my tb coupler. Do you think it's possible I have a leak in the post-MAF hose or the turbo inlet hose? I was looking into replacing those anyways.... unless maybe an intake would help me? I doubt it, I was just curious... because my friend up there with the 06 WRX and Pro-tune has his AF numbers in the negative, running rich slightly. My numbers are way off.

A leak is certainly possible...Cobb's suggestions are in the same vain as well (erroneous/incorrect MAF readings). The turbo inlet and vacuum hoses are all subject to heat-related failure, so anything is possible. Be advised that the "A" range will wander a bit, so don't be alarmed if you see it go somewhat awry compared to the other three ranges under extended idling conditions or abnormal weather/heatsoak.

Interesting... I suppose I'll try another leak test. I wanted to get an aftermarket turbo-inlet hose anyways, maybe I actually need one now. Although I'm curious, how long is the MAF typically good for? I mean, either it works or it doesn't, right? I don't suppose there'd be any benefit to possibly replacing it? I imagine it's quite pricey... lol

It has been shown on several occasions that running the SPT intake requires your MAF to be rescaled.

That depends. This is from Cobb:

A couple of posts on NASIOC suggested different - but all good. I'd prolly check it anyhoo, only takes a long drive and the use of RomRaider Logger set on the MAF tab


Also, seal the intercooler piping using a block in the silicone coupler post turbo and before the manifold and then check for air leaks using an air compressor and regulator to ensure the compressed air is a few PSI above what you are going to run. All air leaks will be heard very easily

I had a stage 1 e-tune done about a month ago. Yesterday for the first time my car threw a CEL at WOT in 5th gear.

During the last iteration of my e-tune (a month ago), the learning view showed IAM of 1, A/F learning 1 all very close to 0 (one .1 the rest 0) and all 0 for the fine learning table.

However after pulling another learning view this morning it looks like below.

Is this just a case of too few tuning iterations? Is monitoring the learning view long term (in terms of time after an ecu reset) just as important as monitoring it after a reset and a WOT pull?

Who was your tuner, Sabotaged?

Infamous1 over at legacygt.com forums. I haven't contacted him yet. Just trying to get a bit of info first.

Let your tuner know. I'm sure he will take care of you. It's probably almost all fuel related since your AFR has wandered to almost -5%. Now that you have good LV info (AFR D, namely), that should be a pretty easy fix. What intake are you running? Your AFR D needs to be rescaled to prevent you from running leaner than intended. That out to clean up a lot of your FLKC.

The CEL has nothing to do with knock.

It's an overboost CEL. The boost control in 5th gear wasn't controlled.