Variable timing live monitor - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Gringosteve · 08-05-2017, 06:52 AM

I am working on a better way of displaying what is going on inside our engine in a Dashcommand skin. It is still early days but wanted to share work so far on a portion of the skin that will display variable timing overlap in real time. Much more to come!

https://www.facebook.com/TunedECU/vi...0405013331208/

I also create custom skins for customers. Message me on Facebook or here for more info.

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Kodename47 · 08-05-2017, 01:12 PM

This might help with the cam angles.

The exhaust cam closes before TDC at 0 retard and the same for the intake at 0 advance.

Gringosteve · 08-05-2017, 04:15 PM

Thanks that should help work out if I have this right! I am measuring cam change angle on odb2 and drawing based on that. I saw a diagram that showed 3 degrees before TDC at closure point, so assumed anything negative was right of TDC.

Do you think I am representing retard wrong?

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Gringosteve · 08-05-2017, 04:25 PM

Looks right based on this, apart from me measuring 0 as -3! I took the -3 from a different Toyota engine by mistake (google error) will fix it now

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Gringosteve · 08-05-2017, 05:36 PM

I think I have sorted it. Had the cam angle durations wrong for both sides. Thanks so much for spotting the error!

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Kodename47 · 08-05-2017, 06:55 PM

The problem is that the diagram you posted shows more adjustment range than the cams actually have in the ROM. So I'm not sure if there's a hard or fast value or just to allow tollerances. The values that I got for the spreadsheet are a good indication. I just add cam overlap into my logs now, but even then it's not 100% helpful as its not easy to determine the cam lift.

Gringosteve · 08-05-2017, 07:26 PM

Yeah I wondered if it was max tolerance.

Once question I have, should I show intake open at TDC or at -3.5 to the right as per this

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Kodename47 · 08-05-2017, 07:54 PM

Quote:

Originally Posted by Gringosteve

Yeah I wondered if it was max tolerance.

Once question I have, should I show intake open at TDC or at -3.5 to the right as per this

In that sheet 0 is TDC, negative is BTDC and positive is ATDC.

Gringosteve · 08-05-2017, 08:19 PM

And so the base cam with no VVT change would be drawn as opening 3.5 degrees left of TDC?

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Gringosteve · 08-06-2017, 04:26 AM

I guess my question is; when the table shows 0 advance for intake, what angle is the cam at? -3.5?

When the table shows 0 for exhaust what angle is the cam at

From that I can make this diagram accurate.

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Kodename47 · 08-06-2017, 04:42 AM

Quote:

Originally Posted by Gringosteve

I guess my question is; when the table shows 0 advance for intake, what angle is the cam at? -3.5?

When the table shows 0 for exhaust what angle is the cam at

At 0 the intake cam opens the valve at 3.5 degrees to the left of TDC and the exhaust valve closes at 7 degrees left of TDC.

Gringosteve · 08-06-2017, 04:44 AM

Perfect and thanks for all the help will fix this now.

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Gringosteve · 08-06-2017, 05:09 AM

Ok, think this now matches your sheet at 0 for both intake and exhaust

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Gringosteve · 08-06-2017, 05:16 AM

One more question, if the intake cam change is given as -10 would the intake be rotating clockwise 10 degrees or anti-clockwise 10 degrees from its 0 point ?

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08-05-2017, 06:52 AM	#1
Gringosteve Senior Member Join Date: Nov 2015 Drives: UK Spec GT86 Location: UK Posts: 144 Thanks: 52 Thanked 44 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Variable timing live monitor I am working on a better way of displaying what is going on inside our engine in a Dashcommand skin. It is still early days but wanted to share work so far on a portion of the skin that will display variable timing overlap in real time. Much more to come! https://www.facebook.com/TunedECU/vi...0405013331208/ I also create custom skins for customers. Message me on Facebook or here for more info. Sent from my iPhone using Tapatalk

08-05-2017, 01:12 PM	#2
Kodename47 Senior Member Join Date: Oct 2012 Drives: UK GT86 Location: UK Posts: 3,040 Thanks: 185 Thanked 1,633 Times in 1,113 Posts Mentioned: 156 Post(s) Tagged: 1 Thread(s)	This might help with the cam angles. The exhaust cam closes before TDC at 0 retard and the same for the intake at 0 advance. __________________ .: Stealth 86 :. Abbey Motorsport/K47 Tuned Sprintex 210 Supercharger Kodename 47 DJ: Soundcloud / Instagram / Facebook

08-05-2017, 04:25 PM	#4
Gringosteve Senior Member Join Date: Nov 2015 Drives: UK Spec GT86 Location: UK Posts: 144 Thanks: 52 Thanked 44 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Variable timing live monitor Looks right based on this, apart from me measuring 0 as -3! I took the -3 from a different Toyota engine by mistake (google error) will fix it now Sent from my iPhone using Tapatalk Last edited by Gringosteve; 08-05-2017 at 04:41 PM.

08-05-2017, 06:55 PM	#6
Kodename47 Senior Member Join Date: Oct 2012 Drives: UK GT86 Location: UK Posts: 3,040 Thanks: 185 Thanked 1,633 Times in 1,113 Posts Mentioned: 156 Post(s) Tagged: 1 Thread(s)	The problem is that the diagram you posted shows more adjustment range than the cams actually have in the ROM. So I'm not sure if there's a hard or fast value or just to allow tollerances. The values that I got for the spreadsheet are a good indication. I just add cam overlap into my logs now, but even then it's not 100% helpful as its not easy to determine the cam lift. __________________ .: Stealth 86 :. Abbey Motorsport/K47 Tuned Sprintex 210 Supercharger Kodename 47 DJ: Soundcloud / Instagram / Facebook

08-06-2017, 05:09 AM	#13
Gringosteve Senior Member Join Date: Nov 2015 Drives: UK Spec GT86 Location: UK Posts: 144 Thanks: 52 Thanked 44 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Variable timing live monitor Ok, think this now matches your sheet at 0 for both intake and exhaust Sent from my iPhone using Tapatalk

08-05-2017, 04:15 PM	#3
Gringosteve Senior Member Join Date: Nov 2015 Drives: UK Spec GT86 Location: UK Posts: 144 Thanks: 52 Thanked 44 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks that should help work out if I have this right! I am measuring cam change angle on odb2 and drawing based on that. I saw a diagram that showed 3 degrees before TDC at closure point, so assumed anything negative was right of TDC. Do you think I am representing retard wrong? Sent from my iPhone using Tapatalk

08-05-2017, 05:36 PM	#5
Gringosteve Senior Member Join Date: Nov 2015 Drives: UK Spec GT86 Location: UK Posts: 144 Thanks: 52 Thanked 44 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I think I have sorted it. Had the cam angle durations wrong for both sides. Thanks so much for spotting the error! Sent from my iPhone using Tapatalk

08-05-2017, 07:26 PM	#7
Gringosteve Senior Member Join Date: Nov 2015 Drives: UK Spec GT86 Location: UK Posts: 144 Thanks: 52 Thanked 44 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Yeah I wondered if it was max tolerance. Once question I have, should I show intake open at TDC or at -3.5 to the right as per this Sent from my iPhone using Tapatalk

08-05-2017, 08:19 PM	#9
Gringosteve Senior Member Join Date: Nov 2015 Drives: UK Spec GT86 Location: UK Posts: 144 Thanks: 52 Thanked 44 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	And so the base cam with no VVT change would be drawn as opening 3.5 degrees left of TDC? Sent from my iPhone using Tapatalk

08-06-2017, 04:26 AM	#10
Gringosteve Senior Member Join Date: Nov 2015 Drives: UK Spec GT86 Location: UK Posts: 144 Thanks: 52 Thanked 44 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I guess my question is; when the table shows 0 advance for intake, what angle is the cam at? -3.5? When the table shows 0 for exhaust what angle is the cam at From that I can make this diagram accurate. Sent from my iPhone using Tapatalk

08-06-2017, 04:44 AM	#12
Gringosteve Senior Member Join Date: Nov 2015 Drives: UK Spec GT86 Location: UK Posts: 144 Thanks: 52 Thanked 44 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Perfect and thanks for all the help will fix this now. Sent from my iPhone using Tapatalk

08-06-2017, 05:16 AM	#14
Gringosteve Senior Member Join Date: Nov 2015 Drives: UK Spec GT86 Location: UK Posts: 144 Thanks: 52 Thanked 44 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	One more question, if the intake cam change is given as -10 would the intake be rotating clockwise 10 degrees or anti-clockwise 10 degrees from its 0 point ? Sent from my iPhone using Tapatalk

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