Your data interval is 1s (try logging fewer things and you should be able to log at 5hz), so it's hard to make any conclusions but it looks like boost was still rising the two times you were at 100% throttle. Not sure what gear you were in but boost in 1st and 2nd seems to be lower (around 15psi)So I bought a OBDLink MX+ and have just been waiting for the car to play up so that I can log it. Today I managed to log full throttle with the issue. Timing advance seem to be ok and commanded/actual boost are withing 1-2 psi of each other but around 7 psi lower than it should be. Below is a link to the log. Maybe someone else will see something in the data that I can't.
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GR Yaris Inconsistent Boost
- Thread starter YobboYaris
- Start date
Yeah that log was done in 2nd. Just took the car out again then and tried in 2nd and 3rd gear to compare. Relative throttle position is limited to around 40% in 2nd gear and rises to around 80% in 3rd which would explain lower boost in 1st and 2nd gear. I'll try logging fewer parameters tomorrow but at this stage it looks like it's just the ECU limiting throttle opening in 1st and 2nd gear (normal operation). Link to the 2nd and 3rd gear log just recorded is below.
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Mintmansam
Obsessed member
- Dec 16, 2021
- 223
- 352
Very interesting, I queried this a while ago. I wondered if there was a torque limit in 1st gear. I was told not, but perhaps that was wrong.Yeah that log was done in 2nd. Just took the car out again then and tried in 2nd and 3rd gear to compare. Relative throttle position is limited to around 40% in 2nd gear and rises to around 80% in 3rd which would explain lower boost in 1st and 2nd gear. I'll try logging fewer parameters tomorrow but at this stage it looks like it's just the ECU limiting throttle opening in 1st and 2nd gear (normal operation). Link to the 2nd and 3rd gear log just recorded is below.
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Throttle = form of Torque limit? Right?
Would the new wave of remaps remove this?
Could just be to low refresh rate not catching larger throttle openings in low gears as any WOT pulls only last a few s at best then...
Really need to up the sampling frequency, log less PID and have a good look in the app settings to speed things up too. Can also be phone, no other bluetooth streaming, battery saving modes, etc.
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So it turns out that Torque's default file logging interval is 1 second. After repeating the test with 0.1 second interval the data still appears to be showing the ECU limiting throttle opening in 1st and 2nd gears. Below is the link to the log. The last 2 peaks are the 2nd and 3rd gear pulls of interest.
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Looks fairly normal to me, at least in terms of boost. I wouldn't pay much attention to relative throttle position, looks like it tops out at 80% anyway.So it turns out that Torque's default file logging interval is 1 second. After repeating the test with 0.1 second interval the data still appears to be showing the ECU limiting throttle opening in 1st and 2nd gears. Below is the link to the log. The last 2 peaks are the 2nd and 3rd gear pulls of interest.
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The Torque wiki says:
so it's not so much the actual value but that a difference at the throttle potentiometer is being measured between 2nd and 3rd gear. The difference indicates that something is changing the throttle position regardless of how flat to the floor your foot is. This also happens to correspond with a change in boost at the very same time. In my opinion this is a method used by the software to limit torque in 1st and 2nd gear which some people have been reporting as "inconsistent boost".
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The ambient temperature was 15 Celsius. I removed commanded/actual boost to keep parameters to an absolute minimum. When I have some more time I'll add them back but previous logs and displays while driving show them to be within in few psi of each other.
Yes but that was low resolution, higher frequency could show issues that are experienced as short hesitations, if such issues exist...
Personally I haven't experienced any hesitations just reduced and inconsistent boost in 1st and 2nd. Will definitely get some higher resolution logs with com/act boost soon.
Do you mean timing advance from the most recent log is to low? Over here in Australia I use 98 from a large/busy BP service station. Generally though our fuel quality is relatively low.
Yeah, my logs show up to 15,5 deg advance at redline but that was at near freezing ambient and 98 quality fuel, need to get logging again now it's 'summer' temps...
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I did some more testing today with additional PIDs commanded/actual boost, ambient air temp etc. With your foot flat the ECU is definitely playing with the throttle behind the scenes.
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to be clear. this log sais:
pedal to the metal...100 % throttle
trottle valve position : 81%
that reminds me how to calibrate throttle in my old honda using hondata ecu with analog poti. needs to be done after working at the throttle valve. you hit the gas and software shows sth. between 95% and 105 %, then you hit the button and say: thats 100%. then you lift the pedal and it says something around 0%, then you say: thats 0%.
life way easier with good old cable connection to the throttle valve. but this should be cleared with a remap
pedal to the metal...100 % throttle
trottle valve position : 81%
that reminds me how to calibrate throttle in my old honda using hondata ecu with analog poti. needs to be done after working at the throttle valve. you hit the gas and software shows sth. between 95% and 105 %, then you hit the button and say: thats 100%. then you lift the pedal and it says something around 0%, then you say: thats 0%.
life way easier with good old cable connection to the throttle valve. but this should be cleared with a remap
Michael Knight
Totally Hooked
Not if you ask mr. Kankkunen and Lancia mechanics at Jyväskylä 1990..
Essentially yes.
With the the pedal to the metal (100%) anywhere from 40-80% has been seen at the throttle potentiometer.
hmm...interresting and good to know for all that noticed less boost at 1st and 2nd gear. so this is by design
