[Cyruz]

so i did my first data log run today. the boost was oscillating a lot and i have no idea that was normal. here is the logs, any help would be great. edit - forgot, i have stock air box (dci coming ) with the steet pipe and forge DV's and this was map 1

[jpsimon]

is that 2nd into 3rd?

[Alex@AKMotorwerk]

looks like the boost was dropping between shifts... Throttle was at 0 and RPM's dropped.

[jpsimon]

why aren't you going full throttle? it appears as if you're just hovering your foot at 90%

[OpenFlash]

Originally Posted by jpsimon

why aren't you going full throttle? it appears as if you're just hovering your foot at 90%

+1
it also likes like you are are declitching before you lift off the throttle (see rpm spike at the end of the gear.)

it would also help to add CAN dbw throttle to the datalog too. Any closures would explain the boost oscillation in the IC pipe.

[Cyruz]

ill redo it in a little bit, ill add that one as well. yes i was shifting from 2nd into 3rd at the start and 3rd to 4th at the end. when i redo it ill just start in 3rd and floor it from 40

[OpenFlash]

Originally Posted by Cyruz

ill redo it in a little bit, ill add that one as well. yes i was shifting from 2nd into 3rd at the start and 3rd to 4th at the end. when i redo it ill just start in 3rd and floor it from 40

Yes, that's the way to do it. Single gear (3rd) from 2000rpm to redline. DTC fully off.

Shiv

[JacksonHandy]

Is the DTC off important? I did 3 logs today, one showed a timing correction around 6200 and another around 5300 rpm.

Temps here in Germany were around +45F

6 MT by the way. Running 9-9 stage 1 default settings.

If I should take it to email let me know.

[jpsimon]

Originally Posted by JacksonHandy

Is the DTC off important? I did 3 logs today, one showed a timing correction around 6200 and the other around 5300 rpm.

Temps here in Germany were around +45F

6 MT by the way. Running 9-9 stage 1 default settings.

with DTC on the ecu can intervene which in most cases will skew the results (if it's cutting power due totraction issues etc).

[JacksonHandy]

I thought about that, but I never got the flashing DTC warning.

Although I would be seriously proud of my self if I could spin the tires at ~60 mph and 3k rpm. lol

[Cyruz]

kk, so i went back and did it again from 3rd gear 2k till redline floored 100% of the time. dtc off fully. i think its better now, there is less oscillation in boost. is the peak supposed to go that high ( i know its when im shifting )

[OpenFlash]

Looks perfectly fine. I see you re having a hard time keeping full throttle though

[Alex@AKMotorwerk]

Originally Posted by Cyruz

kk, so i went back and did it again from 3rd gear 2k till redline floored 100% of the time. dtc off fully. i think its better now, there is less oscillation in boost. is the peak supposed to go that high ( i know its when im shifting )

that's better

Yeah, boost will spike like that between shifts when ur off the throttle.. it's normal

[jpsimon]

that spike isn't seen by the engine, that is 100% normal. you'll see it in every datalog when shifting

[jpsimon]

and yeah.... stop lifting! keep that foot planted man

[Cyruz]

thanks. just wanted to make sure that spikes that high were normal. i could have sworn i had it down the whole time. so if the engine ( and turbos ) dont see the spike im all good.

[OpenFlash]

Originally Posted by Cyruz

thanks. just wanted to make sure that spikes that high were normal. i could have sworn i had it down the whole time. so if the engine ( and turbos ) dont see the spike im all good.

Yes, you will even see the spikes in valet mode or with the stock tune. That's what the bypass valves are designed to relieve when the throttle slams shut. That's there the "whoosh" comes from.

Shiv

[Joshboody]

couple questions as a 3rd party viewer trying to decide which to tune to go with...
1. looks like there's timing advance correction during part or no throttle after the run. Also some advance correction in the beginning after full throttle??
2. what triggers the extra timing retard for shifting... based on throttle position?
3. CAN DBW throttle is actual TPS correct? Fluctuation in the beginning I would imagine is to control boost, but I thought boost was directly controled at solenoid?

Cyruz, can you post the actual timing, or DME timing

[Joshboody]

when i see procede maps, they are always in the above format, but you can export to excel and graph per various values right?? and the data point are around 10 to 20 per/sec??

[OpenFlash]

Originally Posted by Joshboody

when i see procede maps, they are always in the above format, but you can export to excel and graph per various values right?? and the data point are around 10 to 20 per/sec??

Yes, they are logged as .csv files and can be viewed in excel. And I believe the sampling rate is closer to 30 samples/sec.

Shiv

[OpenFlash]

Originally Posted by Joshboody

couple questions as a 3rd party viewer trying to decide which to tune to go with...
1. looks like there's timing advance correction during part or no throttle after the run. Also some advance correction in the beginning after full throttle??

There is positive timing correction (advance) during certain cruise conditions and also at the beginning of the WOT run (during spool-up). This fills in the torque "hole" that occurs during sudden throttle openings. Once full boost is achieved, this correction is negative to the tune of up to 5 degrees depending on boost pressure, IAT, RPM, ignition correction setting, etc,. There is also a big timing retard that occurs when you lift off the throttle at the end of a WOT pull. This is a component of the throttle delay fix feature. This prevents over-advance during the shift which would otherwise result in knock/knock correction once the next gear is selected under boost.

2. what triggers the extra timing retard for shifting... based on throttle position?

Ooh these are good questions The big timing retard during the shift is triggered by a combination of things: The amount of the manifold pressure spike that occurs when you lift, the amount of throttle lift (min TPS voltage) and the rate/duration of the throttle lift.

3. CAN DBW throttle is actual TPS correct? Fluctuation in the beginning I would imagine is to control boost, but I thought boost was directly controled at solenoid?

Boost is controlled by both the solenoid DC and throttle activity. The effect of solenoid DC corrections isn't particularly fast when it comes to adjusting engine load. So the DME also uses throttle activity. This is especially evident during sudden changes of engine load. You can "tune" this closure out by simply making it so that actual boost is always below desired boost. But that is still a boost error, albeit a negative one. In about two weeks, we will be doing away with ~75% of our existing boost control logic and adopting something MUCH more effective

Cyruz, can you post the actual timing, or DME timing

If he recorded it, he sure can.

Shiv

[Kelvin1000]

Keep your foot all the way down!!!