Help a newbie with data logging(asking for a friend)

[Baarnold]

Hey everybody this is my first post on the forums, I don't own a Mazdaspeed 3 but my good friend does(2007 speed 3) and I have been helping him on his journey learning about, working on, and improving his car with him. Recently we replaced his stock turbo with an XS-power replacement K04 K0422-881 882, the old turbocharger had a crack between the exhaust side of the turbo and the waste gate on the exhaust side of the turbo, my buddy bought his 2007 speed 3 with about 102k miles I believe and now its at almost 110k miles. He has a Cobb cold air intake, Cobb inlet tube, Second cat delete, JBR passenger and driver motor mounts and I believe that is everything for modifications. Now after the new turbo install we are no longer making more than 16 pounds of boost on the stage one plus tune, the stage one tune allows us to go just a bit over 16psi. We did a data log of a pull from 2000rpm to redline in fourth gear, I was hoping somebody could give us a bit of insight on how to analyze data logs and what to watch out for when checking them over, or possibly tell us if anything is visible wrong or alarming. If I missed anything let me know.

[Baarnold]

Here is my log, forgot to attach to original post(sorry for pointless bump)

[Baarnold]

Here’s the old turbo, I’ll stop bumping now, old turbo says L3K9 13 700F KO422-881 A 6XW 160, couldn’t find much on the internet indicating whether it was a factory turbo or not ,sorry for the ignorance.

[danb]

not sure if this helps...
http://accessecu.com/support/docs/su...0Guidance.html

MSF custom search, https://cse.google.com/cse?cx=007197...1oxu#gsc.tab=0
...save it....

[BN00249]

Also note that flooring your car below 3krpm on stock rods will send 1 of those rods through the block in no time.

Your map must be targeting 16psi because its pulling WGDC.

[MSMS3]

I believe that turbo is one of the Chinese knock-off K04s some have been using here with reasonable reliability so far. It's still a K04 and will eventually have seal failure and smoke, like everybody else. Probably no worse than a much more expensive OEM replacement. I would have recommended a BNR Stage 1, which is plug and play but with Garrett CHRA adapted to fit an internally modified K04 snail. Flow is identical and tuning is the same as for the OEM turbo. That is a permanent fix for our chronic "smoking turbo" woes, but costs double what the knock-off K04 goes for.

But, it will probably serve well for as long as an OEM K04 would.

I agree that you should not go wide open throttle below 3,000 rpm. Rods get bent that way.

It appears to be a safe, conservative tune using stock boost levels, but extending it out past where the stock tune usually starts closing the throttle body. It should improve performance over stock, but is very safe and conservative.

The hpfp pressures look great. Wastegate duty cycle is modest and suggest a lot of "room to grow". AFR's are good. Timing is relatively conservative for the tune, but very safe. Boost target appears to be purposefully set at 16 psi max.

It is a modest "Stage 1" type tune, an improvement over stock, but way short of capabilities of the K04 on pump gas. Boost can be higher at lower rpm under load, as high as 18 psi in the 3,500-4,500 rpm range, but must taper toward redline because of the small K04 snail. Timing can be more aggressive if AFRs are kept rich. You can build more power up top with timing and rich AFR rather than flame thrower boost levels on the tiny K04 snail. Try to push it up high with high boost and boost temps climb through the ceiling, so do EFTs and It makes no more power. Power will max out at around 300-310 whp with a K04 in pump gas in our cars. You can do a little better with the cooling from sensible gas/ethanol mixes. but you will not be seeing 350 whp on a K04, at least not safely.

Is this a Cobb AP off the shelf tune, Versatune stock map, or where did this come from?

[Baarnold]

It’s currently running a Cobb stage one OTS map, appreciate the feedback and information a lot.

[MSMS3]

Originally Posted by Baarnold It’s currently running a Cobb stage one OTS map, appreciate the feedback and information a lot.

Cobb Stage 1 maps are barely better than stock, but are a step up. At least they give you power to redline and remove the stock tune's restriction to full boost in the lower two gears. Their OTS maps beyond what you have are . . . not so good. I've not run them, but there is huge disappointment on this board about them. Honestly, you'd do a lot better than this with the simple relatively inexpensive "canned" Hypertech tune, which works amazingly well for stock K04 on pump gas, is compatible with just about all bolt-on mods provided you keep the K04 and run pump gas. It is capable of just about maxing out the k04 on pump gas. I did.

Cobb ripped it with most users here by removing self-tuning capability. That was available for many years through separate free Cobb ATR software. Cobb, ditched it in favor of a "pay to play" system that requires training and an extra fee. Your customer either needs to find a tuner that has access to that software (many good certified e-tuners on this board), or look at another tuning option like VersaTune, if he wants to get more out of the stock turbo on pump gas.

The best current tuning option is probably VersaTune. I'm sure some of their users and tuners will come along with more information, if your customer is interested.

[Baarnold]

Okay so quick update on the car, my buddy did a few data logs on his own out driving around. SO basically the way my buddy explains it is that it feels like his car almost hits red line before suddenly cutting off, we cant really tell what the problem might be related to and we have both collectively done hours upon hours of reading up about common problems on the forums. The car also somewhat jerks when the engine/throttle cuts itself off to varying degrees depending on which gear its in. The car has been doing it significantly less since the new turbocharger was installed (only half a dozen times or less or so) If anybody could take a good look at this data log and possibly tell us what the problem is we would greatly appreciate it again.

[Vansquish]

Originally Posted by Baarnold Okay so quick update on the car, my buddy did a few data logs on his own out driving around. SO basically the way my buddy explains it is that it feels like his car almost hits red line before suddenly cutting off, we cant really tell what the problem might be related to and we have both collectively done hours upon hours of reading up about common problems on the forums. The car also somewhat jerks when the engine/throttle cuts itself off to varying degrees depending on which gear its in. The car has been doing it significantly less since the new turbocharger was installed (only half a dozen times or less or so) If anybody could take a good look at this data log and possibly tell us what the problem is we would greatly appreciate it again.

Next time you take a log, make sure that you are also logging the injector duty cycles parameter. Without that, it's a bit hard to see exactly what's going on as far as whether the ECU is commanding a fuel cut, though it does kind of look like that might be the case (HPFP Actual Pressure drops to 0 at line 73 of the datalog).

Also, you're running very, VERY lean while in boost. There is definitely something wrong with your car. You should be in the 10 or 11:1 AFR range in boost, but you're up near 14:1. This is a recipe for a blown engine. Basically, what this means is that your engine is not getting enough fuel in relation to the quantity of air that is being drawn into the engine.

In all likelihood, since this is an OTS tune and seems like it is (probably) suitable for the modifications on the car, this indicates that there is a physical issue. Since the turbo has recently been replaced, there's a pretty good chance that a vacuum leak might've been introduced into the intake system. Make sure to check the intake from the filter all the way to the turbo, and the boost tubes on the intercooler as well. Make sure none of the tubes, rubber, silicone, or otherwise are cracked, pinched, or otherwise damaged. Also, make sure that they are all properly and securely connected.

Pay special attention to everything between the MAF housing and the turbocharger, as that would be the likeliest place to introduce unmetered air without running rich while in boost.

[MSMS3]

Yes, something is up with lean AFR. Most likely a post maf sensor leak. And the unmetered air being pulled in is also unfiltered air. That is not good. Look for a leak around the connection between the turbo inlet pipe and the compressor side of the turbo and all vacuum lines. But it could be just about anywhere before the throttle body, any boost tube, lines and hoses. That is why it’s hitting a hard cut, running up against some safety net and cutting off fuel.

At the same time the fuel cuts, AFR does go rich (to where it should have been before the cut). I think Vanquish is onto something by requesting a log with injector duty cycle. My bet is that the number will be larger indicating that the injectors are staying open longer to try to get more fuel into the cylinder to match the unmetered air.

This log is way different from the first log, which was very clean. What happened? What changed mechanically?

[Pu Manchu]

Originally Posted by MSMS3 This log is way different from the first log, which was very clean.

I disagree, the first log was lean at WOT as well. I think OTS targets 11.0/11.6* depending on if he's running the 91/93 map, but he was at 12.2 til KR added fuel.

[MSMS3]

Originally Posted by Pu Manchu I disagree, the first log was lean at WOT as well. I think OTS targets 11.0/11.6* depending on if he's running the 91/93 map, but he was at 12.2 til KR added fuel.

Yes, a little lean, not optimal, but not crazy dangerous like now. Something has changed.