Still a bit of a dodgy LV

New valves, refinished heads and still...

 

 

I'm getting frustrated. Adding to the frustration is a laptop battery that doesn't want to last any more than 20 minutes and the nearest on-ramp to pull a log is about 5 minutes further away.

 

What should I be logging around town to get to the bottom of this?

 

Thanks.

What are you worried about, that low load knock? Is it lowering your IAM or something? Doesn't seem that significant to me. If you want to see if it's real knock or fake knock, pull timing in those areas and see if it still develops FLKC.

You know that editing the map is about 13.2 lightyears ahead of what I can do

I also can't seem to find how to view the current map with RR to see if the timing issue with #4 was ever dealt with in the latest ROM from Subaru.

To view the map, I use ecuflash to read and save. Then you can load that image to romraider's ECU editor and view it's properties. Or you can just look at the tables in ecuflash.

Your D AFR learning (40.00 g/s +) is a bit cornerning. What are your mods? Stock?Also, enable your DTC reader.

It's within the acceptable +/-5 range. I did enable DTC reader and there's nothing stored.

 

All stock with the exception of a catless up-pipe

the +/-5% is acceptable for your A-B range, but not your D range. it would be better to be .5% +/-. Your short band afr is only good to about 60 g/s. after that you need a wide band to read beyond 60 g/s. So in reality, you're over 4% lean up to about 60 g/s. Who knows where you are at WOT. Just giving you a heads up.

So it's cutting fuel by 4.6% because there's not enough air coming in? How do I know if it's actually lean or not if it's cutting fuel to maintain correct AFR?

 

I'm rubbish at this, really.

I would definitely check hoses coming off the manifold. A manifold leak will pull extra air after the TB at low air flow ranges and then push air out under boost.

I guess I'll have to take it back to the dealer and have them look at it. It's running great after the re-build but clearly the LV display shows otherwise.

 

Thanks for the tips!

It will also be good to get it tuned. Now that your up pipe is catless, your turbo is going to be spoiling a bit easier. Get the most out of it by getting a stage 1 tune

 

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Your dealer isn't going to do jack, even if you show them this. And honestly, I probably wouldn't either.

 

Asking for a D correction range of 0.5% like 311logan311 wants isn't impossible, but it's difficult. Corrections will fluctuate with temperatures somewhat as well.

 

The ranges are there for a reason and what TonyRas suggested about tuners effectively disabling range D is not something I'd suggest. He's also not correct about D range being estimated from C range. D range is done in the small gap from 40g/s upwards of about 55-60g/s when it switches to Open Loop.

 

The AFR trims are there as much for safety as fuel economy. If you have a fueling issue that causes you to run rich or lean, D range can learn between about 40g/s-60g/s before it switches to Open Loop and starts blindly fueling based on your Primary Open Loop Fueling table.

 

If you disable range D by increasing it to 80g/s, any fueling problems with your car will never get compensated for during WOT.

So I leave it like it is and forget about it?

 

And the mechanic at the dealer who works on my car is very good. He's not a tuner, but he's a good tech.

He'll say, "It's nothing that concerning and the numbers are within tolerances."

 

Your knock is in the low load / low RPM area. If you want to do something about it, you need to log and capture the event where the knock occurred. It could even be completely false knock due to a rattle or something loose.

 

It's good that you don't have any knock at the high load / high RPM range.

 

A positive fuel trim in A can indicate a very slight vacuum leak, so as they said, it's worth looking into.

Do some data logs. That will show more than all of our guessing and suggestions.

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Quick log again showing quite a bit of FBKC and two LV's, one taken before resetting the ECU, the second taken after resetting and logging.

romraiderlog_20130220_143303.csv

inlet or airbox leak. your columns aren't labeled in the log, I think the right hand column second to the end is fbkc

Oops, fixed the column headings.

To view the map, I use ecuflash to read and save. Then you can load that image to romraider's ECU editor and view it's properties. Or you can just look at the tables in ecuflash.

 

ecuflash wouldn't connect to the ECU.

you likely have a post-turbo leak. acts as a vacuum leak in trim A/B and a boost leak under boost in Trim C/D.

good point, looks to be a manifold leak or post-turbo, intercooler leak

What's the peak stock boost? I only seem to be hitting 12.2 on that log.

 

I guess back to the dealer it goes to look for a boost leak.

yeah, more than 12.

What's the peak stock boost?

 

13.5 psi.