Just got my Durametric cable today and did a quick test run. It's my first time using the tool, so I'm not sure if I'm monitoring the right sensors. I did some searching on the forum, and turned on the most popular ones that people use on here.

My question is after the pull to near redline, I was off the throttle and just coasting/slowing down. If you look at the log it shows the lambda values went to 15.xxx and didn't come back down until the RPM was around 2600. Is there something wrong?

Also, how do I know if the engine load and the ignition angle is optimal?

 

RPMs dont seem to climb quick enough. Was the pull to near redline at WOT?

Some of lambdas look a little rich, but I would like to see a WOT run to limiter to really evaluate.

 

Yes, it was WOT to near redline. I let off around 6200rpm though.

I saw that it was running rich towards redline. Any idea on why it went to 15.999 after I let off the throttle?

I can email the actual excel log file, can't attach it with the post.

 

Normal to go off the chart lean when you let off in gear like that. Engine doesn't need fuel as the wheels are driving it at that point. Once it gets back to light loading, it goes straight back to ~stoich (1.0).

Looks a little fat, but timing appears pretty stable for pump gas. Boost tapers off a bit up high, may want to log requested boost as well to see what its commanding.

Time would help too, thats a lot of samples but IIRC 997s can spit out data pretty quickly. Then you can tell how quick the IATs are ramping up.

 

Thanks for clearing that up.

which field is requested boost?

 

I believe its "setpoint boost pressure"

 

What mods/tune do you have? Fuel?

 

Fabspeed exhaust/Denso PK20 plugs/APR tune. 93 octane.

Here's a PDF file that has more data in it. Looks like the IAT went up real quick when I did the pull, or is that normal? Also check out page 21, again starting at page 32 and towards the end, I see timing going to negative and zero. Is that because I'm off the throttle and there's little to no load on the engine?

 

OK, so it is WOT...

I am still perplexed by this log as the rpms are not constantly climbing.? Also I dont know how you got so many data points over such a small time interval? You must have a super computer for a lap top! LOL!

I do see what I believe is a problem this time. Your ignition angle should start low at the point of turbo spool and gradually increase to the limiter. Yours does some hopping back and forth which looks like timing being pulled to prevent knock. Perhaps nearly 1.5 bar and timing that the tune calls for is too much for gas you are running?

BTW, lambdas dont look as rich to me this time...

 

The log included parts that I was just coasting/cruising. Not sure if that's the part you are referring to. I only did one pull from 28xx rpm to 62xx, and the road was kind of bumpy. So maybe the RPM wasn't going up smoothly towards the top. I'll get a pull again tonight on a smooth road. Not sure on the data points, I'm actually using an older laptop and I just left all the settings in Durametric on default and enabled data logging. (Using the newest 6 software on their site)

I noticed the timing issue that you're talking about. I wasn't sure what the ignition angle numbers meant, but I'm assuming the higher the number=more timing? Should I monitor some other sensors like misfire or retardation in cylinders to see if there's an issue?

 

up 20C in 5 secs, may I suggest your next mod?

the timing bouncing around when off throttle is normal as well. A few small bobbles in timing at WOT is pretty normal on pump gas with the hypersensitive knock sensor feedback loop on these things.

This is an example of a car pulling significant timing:
https://www.6speedonline.com/forums/...g-numbers.html

note the difference when he runs e85 later in the thread

 

997.2 ICs? lol Will that work without any change to the tune?

I noticed my engine load went as high as 213, does that mean the engine is being over worked?

Sorry for all the noob questions, I'm very new at using/reading Durametric.

 

Did another run, with sport mode on this time. Still 93 octane with 10% ethanol.

 

The map still is not what I am used to seeing with my pump tune, but timing is less shaky on this run 18 degrees and 1.4 bar is alot om 93 oct. I dont like how much the boost tapers at the top end from 1.4 down to 1.1 bar. This run looks very rich with lambas as low as 0.70 (afr ~ 10.3)...

I would consult your tuner and let him see the log and explain why the parameters are the way they are.

 

agreed, both the boost drop and fat AFRs may be indicative of a leak. In fact, it gets richer as the boost tapers. Logging MAF and setpoint boost pressure in addition to what you already have may shed some light onto it.