TunerStudio AFR guage seems wrong
Moderator: LT401Vette
-
- Experienced MS/Extra'er
- Posts: 220
- Joined: Fri Nov 20, 2009 10:55 am
TunerStudio AFR guage seems wrong
A friends car that I am helping him tuning at the moment. Has a 10point4 Wideband controller simulating LC-1 output. AFR = 2V + 9. He has a separate gauge in his dash to the controller. TunerStudio seems to be showing around 1 AFR richer. I took some datalogs for about 1minute at idle to check the AFR was 13.5, gauge on dash showed 13.5 but TS showed 12.5
TunerStudio beta 1.21
Megasquirt 3 MSextra 1.0.5
P.S. I tried custom controller and set 1V = 11 AFR, 4V= 17 AFR. Same result.
TunerStudio beta 1.21
Megasquirt 3 MSextra 1.0.5
P.S. I tried custom controller and set 1V = 11 AFR, 4V= 17 AFR. Same result.
Westfield SEiGHT 4.6 Stage III
Running Megasquirt3 Wasted Spark using EDIS-8 Firmware MS3Extra 1.1.1
Build site
Running Megasquirt3 Wasted Spark using EDIS-8 Firmware MS3Extra 1.1.1
Build site
Re: TunerStudio AFR guage seems wrong
Are the AFR gauge, MS controller, and WB controller all grounded to the same place?
If not, they should be.
If not, they should be.
___________________________________________________________
If nothing breaks, you're not trying hard enough...
Datsun 280Z
ITB
Turbo
MS3 + MS3X
If nothing breaks, you're not trying hard enough...
Datsun 280Z
ITB
Turbo
MS3 + MS3X
-
- Super MS/Extra'er
- Posts: 12733
- Joined: Sat Jul 16, 2005 8:07 am
- Location: Moorseville, NC
- Contact:
Re: TunerStudio AFR guage seems wrong
That is not the formula the LC1 uses....simulating LC-1 output. AFR = 2V + 9
The LC1 Default is:
AFR = 3.008 + 7.35*V
Or the LC1 programmed as an LM1 or PLX:
AFR = 2V + 10
Is that what your WB is programmed to output, or is it programmed to simulate an LC1?
That should not be the same results. in any case, but if it is still not reading correctly, there is most likely a grounding issue. Where is you MS grounded compared to your Gauge?P.S. I tried custom controller and set 1V = 11 AFR, 4V= 17 AFR. Same result.
When you said:
I get that TS showed 12.5 and the gauge showed 13.5, but what was the reference for the baseline 13.5?I took some datalogs for about 1minute at idle to check the AFR was 13.5, gauge on dash showed 13.5 but TS showed 12.5
Phil Tobin
EFI Analytics, helping to simplify EFI
Next Generation tuning software.
Supporting all MegaSquirt versions and firmwares.
http://www.TunerStudio.com
http://www.efiAnalytics.com/MegaLogViewer/
Support the firmware running your engine:
http://www.msextra.com/doc/donations.html
EFI Analytics, helping to simplify EFI
Next Generation tuning software.
Supporting all MegaSquirt versions and firmwares.
http://www.TunerStudio.com
http://www.efiAnalytics.com/MegaLogViewer/
Support the firmware running your engine:
http://www.msextra.com/doc/donations.html
-
- Experienced MS/Extra'er
- Posts: 220
- Joined: Fri Nov 20, 2009 10:55 am
Re: TunerStudio AFR guage seems wrong
Thanks for the replies guys. I wont see this car now until the weekend. Could be right on the LC-1, it may be TechEdge. I did note that the output was the same as my AFR which is a TechEdge 2J1.
What I can say is that it was consistent before we upgrade from MS2 to MS3 and took the latest versions of everything.
I'll do some more investigations the weekend.
What I can say is that it was consistent before we upgrade from MS2 to MS3 and took the latest versions of everything.
I'll do some more investigations the weekend.
Westfield SEiGHT 4.6 Stage III
Running Megasquirt3 Wasted Spark using EDIS-8 Firmware MS3Extra 1.1.1
Build site
Running Megasquirt3 Wasted Spark using EDIS-8 Firmware MS3Extra 1.1.1
Build site
-
- Experienced MS/Extra'er
- Posts: 220
- Joined: Fri Nov 20, 2009 10:55 am
Re: TunerStudio AFR guage seems wrong
I've been able to check which AFR settings are used, TechEdge Wideband Linear which I am fairly certain is AFR = 2 * volts + 9. Also we did some live tuning (VE analyse Live) and that seemed to tune with regard to the AFR as shown on the gauge in the dash, not the AFR shown in TS.
Westfield SEiGHT 4.6 Stage III
Running Megasquirt3 Wasted Spark using EDIS-8 Firmware MS3Extra 1.1.1
Build site
Running Megasquirt3 Wasted Spark using EDIS-8 Firmware MS3Extra 1.1.1
Build site
-
- Super MS/Extra'er
- Posts: 12733
- Joined: Sat Jul 16, 2005 8:07 am
- Location: Moorseville, NC
- Contact:
Re: TunerStudio AFR guage seems wrong
TS would be using the same AFR the gauge is showing for VE Analyze unless you have multiple AFR's and have the gauge set to the wrong one. So I would be careful if you believe you have a setup error causing afr to be incorrect. Normally with a single WB the only afr in question is the OutputChannel afr1 which is reported to TunerStudio from the firmware. That is what is displayed on the gauge, used during VE Analyze or any thing else that subscribes to the OutputChannel afr1.Also we did some live tuning (VE analyse Live) and that seemed to tune with regard to the AFR as shown on the gauge in the dash, not the AFR shown in TS.
Once you know you have it calibrated with the right formula, use a volt meter to check the input voltage to the MS. Make sure they are consistent with what you are expecting to see.
Phil Tobin
EFI Analytics, helping to simplify EFI
Next Generation tuning software.
Supporting all MegaSquirt versions and firmwares.
http://www.TunerStudio.com
http://www.efiAnalytics.com/MegaLogViewer/
Support the firmware running your engine:
http://www.msextra.com/doc/donations.html
EFI Analytics, helping to simplify EFI
Next Generation tuning software.
Supporting all MegaSquirt versions and firmwares.
http://www.TunerStudio.com
http://www.efiAnalytics.com/MegaLogViewer/
Support the firmware running your engine:
http://www.msextra.com/doc/donations.html
-
- Experienced MS/Extra'er
- Posts: 220
- Joined: Fri Nov 20, 2009 10:55 am
Re: TunerStudio AFR guage seems wrong
Thanks for the reply Phil. Yes appreciate it is the same channel but with everything seeming to match except the AFR gauge in TS I was wondering if it takes an ADC and applies a conversion to show as AFR and I was thinking that might have a problem. But I appreciate I have made 5 from 2 + 2.
This is my plan. I have spoken to my friend and advise him to do this.
Add a lambda gauge next to the AFR gauge in TS and place the laptop next to the AFR Gauge in the car. Take data log, and also video the laptop screen with the in car AFR gauge and start the car up which has been pre-warmed. We can then use the ignition event as the start position of the data log and video and see where the difference is.
This to be done after checking the ground, wiring and also the output voltage level from the WB controller (14point7 SLC). Also double checking the firmware calibration which I have done several times anyway. BTW, if you select known WB controllers from the TS calibration menu the reference points on the same dialog do not update, they are greyed out but still it makes you think something is wrong.
Anything to add to our test?
This is my plan. I have spoken to my friend and advise him to do this.
Add a lambda gauge next to the AFR gauge in TS and place the laptop next to the AFR Gauge in the car. Take data log, and also video the laptop screen with the in car AFR gauge and start the car up which has been pre-warmed. We can then use the ignition event as the start position of the data log and video and see where the difference is.
This to be done after checking the ground, wiring and also the output voltage level from the WB controller (14point7 SLC). Also double checking the firmware calibration which I have done several times anyway. BTW, if you select known WB controllers from the TS calibration menu the reference points on the same dialog do not update, they are greyed out but still it makes you think something is wrong.
Anything to add to our test?
Westfield SEiGHT 4.6 Stage III
Running Megasquirt3 Wasted Spark using EDIS-8 Firmware MS3Extra 1.1.1
Build site
Running Megasquirt3 Wasted Spark using EDIS-8 Firmware MS3Extra 1.1.1
Build site
-
- Super MS/Extra'er
- Posts: 12733
- Joined: Sat Jul 16, 2005 8:07 am
- Location: Moorseville, NC
- Contact:
Re: TunerStudio AFR guage seems wrong
That is the model for MS1, but with MS2 and MS3, TS only uses the conversion formula / inc file to generate the calibration tables when you run "Calibrate AFR..."I was wondering if it takes an ADC and applies a conversion to show as AFR and I was thinking that might have a problem.
After that the firmware does the look ups on the calibration tables sends back already converted afr based on those calibration tables.
Phil Tobin
EFI Analytics, helping to simplify EFI
Next Generation tuning software.
Supporting all MegaSquirt versions and firmwares.
http://www.TunerStudio.com
http://www.efiAnalytics.com/MegaLogViewer/
Support the firmware running your engine:
http://www.msextra.com/doc/donations.html
EFI Analytics, helping to simplify EFI
Next Generation tuning software.
Supporting all MegaSquirt versions and firmwares.
http://www.TunerStudio.com
http://www.efiAnalytics.com/MegaLogViewer/
Support the firmware running your engine:
http://www.msextra.com/doc/donations.html
-
- Experienced MS/Extra'er
- Posts: 220
- Joined: Fri Nov 20, 2009 10:55 am
Re: TunerStudio AFR guage seems wrong
Thanks for explaining that Phil. I spoke to my friend last night regarding the checks. Asked him to dig out his wide band controller manual and check the voltage output
Yes, it is different!!
You can relax
it gives 0v to 5v which is linear to 10:1 to 20:1. So I have talked him through re-calibration. He tells me now that the dials look more consistent.![Very Happy :D](./images/smilies/icon_biggrin.gif)
We going round Oulton on Friday![Yeah! :yeah!:](./images/smilies/icon_yay.gif)
![Read the manual :RTFM:](./images/smilies/icon_reading.gif)
![Embarassed :oops:](./images/smilies/icon_redface.gif)
You can relax
![Smile :)](./images/smilies/icon_smile.gif)
it gives 0v to 5v which is linear to 10:1 to 20:1. So I have talked him through re-calibration. He tells me now that the dials look more consistent.
![Very Happy :D](./images/smilies/icon_biggrin.gif)
We going round Oulton on Friday
![Yeah! :yeah!:](./images/smilies/icon_yay.gif)
Westfield SEiGHT 4.6 Stage III
Running Megasquirt3 Wasted Spark using EDIS-8 Firmware MS3Extra 1.1.1
Build site
Running Megasquirt3 Wasted Spark using EDIS-8 Firmware MS3Extra 1.1.1
Build site