TDStuart Tuning Adventure

[WildHorse]

I think that would be sick

This is sick

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[K4fxd]

Bo & Luke Duke were my virtual driving instructors on the gravel roads of Chippewa and Clark County Wis. before virtual was a thing.

Hey hey another Wi boy. I grew up just a few counties over in Pierce. Little town called Beldenville. I loved the gravel roads. I lived in Eau CLaire for awhile.

 

[GregO]

Hey hey another Wi boy. I grew up just a few counties over in Pierce. Little town called Beldenville. I loved the gravel roads. I lived in Eau CLaire for awhile.

Small world isn’t it.
Eau Claire, Back in the days when John Menard owned only ONE lumbar yard !

 

[tdstuart]

Threw a code went into a reduced power mode. Clearing it doesn’t work imma reflash the car as I need to drive it. So annoying. Fuel trims have been looking good and car was driving good. I think it’s mad at the fix…

 

[markmurfie]

Threw a code went into a reduced power mode. Clearing it doesn’t work imma reflash the car as I need to drive it. So annoying. Fuel trims have been looking good and car was driving good. I think it’s mad at the fix…

Have you not started tuning your torque model?

You have to correct the demand torque to what the ECU is estimating the engine is making for torque. Make sure the IPC max and min tables are out of the way, then move them back in on the variation once you have the torque error reduced to an acceptable level.

Theres quite a bit of moving parts to this torque model and tuning it.

Theres demand torque and the engine brake torque that is an estimate of the torque the eninge is making at the current air properties, spark, fuel, cam positions, ect..

Then theres the indicated/ schedule torque at the given RPM and air load. This is used to eliminate much of the variablity those other variables and many others cause. It provides a much more stable and consistent model for the ECU to impose limits and saftey control from.

Where and how you want to correct the error in all this is subject to many differing opinions on the "correct" place and methods to do it. Many move the IPC min and max out of the way, raise the allowed torque error, then never move them back and solely let the PID correction loops work hard.

 

[tdstuart]

Have you not started tuning your torque model?

You have to correct the demand torque to what the ECU is estimating the engine is making for torque. Make sure the IPC max and min tables are out of the way, then move them back in on the variation once you have the torque error reduced to an acceptable level.

Theres quite a bit of moving parts to this torque model and tuning it.

Theres demand torque and the engine brake torque that is an estimate of the torque the eninge is making at the current air properties, spark, fuel, cam positions, ect..

Then theres the indicated/ schedule torque at the given RPM and air load. This is used to eliminate much of the variablity those other variables and many others cause. It provides a much more stable and consistent model for the ECU to impose limits and saftey control from.

Where and how you want to correct the error in all this is subject to many differing opinions on the "correct" place and methods to do it. Many move the IPC min and max out of the way, raise the allowed torque error, then never move them back and solely let the PID correction loops work hard.

No it’s running the same tune file I sent. Should I bother tuning the torque with the stock inj/cai or just wait until I put the lu47 and PMAS back in?

 

[markmurfie]

No it’s running the same tune file I sent. Should I bother tuning the torque with the stock inj/cai or just wait until I put the lu47 and PMAS back in?

What ever you're more comfortable with. Having known good when learning eliminates a lot of questions.

 

[engineermike]

I worked through some torque errors recently in my Roush truck that were caused by an inaccurate TB model. I believe this is also related to the SD model’s inaccurate manifold pressure output in tdstuarts car.

 

[Pistol_91]

It's a pretty common code and easy bandaid don't get discouraged yet... Lol

 

[tdstuart]

Okay so I decided to try and teach myself how the mapped points work by writing a ghost cam tune.

I have it chopping and I think I understand how the mapped points work but the result I am getting is not what I expect.

Basically when the car starts I want it to start chopping asap.
When the car starts vct is disabled for 3 seconds (to build oil pressure). Then it goes into emissions reduction mode. Then when the car decides thats fine it goes into Optimal Stability mode.

My issue is when it goes into emissions reduction mode based on my changes I would expect it to instantly go to my mapped point 0 where it will put the cams in overlap and chop. Instead the cams like to hang out around 0,0 and after a while will start trying to move to mapped point 0. Then when it switches into Optimal Stability the cams will hang out around 0,0 or 0,20 (ivo,evo) then slowly start to move to my mapped point 0 over about 30 seconds.

I just don't know why this isn't happening instantly. Is there code in the ecu that we can't influence that is affecting this?

From my understanding during Optimal Stability this is what the car is doing:
Goes to Mapped Points Distance - Stability, then based on rpm and temp it will get its distance number. Then it goes to HDFX Index for Mapped Points - Optimal Stability Distance and use the distance number to find the mapped point to be at. Then the car will look at the Segment Points to figure out how to blend (since it has the mapped point 0 it will look at Segment Point 0 which shows 0,1).

But clearly either I am missing something or the ecu does some extra stuff that we can't control as the above would mean it instantly goes into chopping and blends points 0,1 (which both have overlap)

Tune attached someone let me know what I am doing wrong. Ill get a log in a little bit too.

 

[engineermike]

@tdstuart did you change the cam timing for any of the oem mapped points?

 

[tdstuart]

@tdstuart did you change the cam timing for any of the oem mapped points?

Ya I changed mapped point 0 and 1.

I set mapped point 0 exhaust to 35 and mapped point 1 exhaust to 10. It’s just something I saw another person do. I’m not sure if mapped point 1 needs to be changed at all.

 

[tdstuart]

I think I found the issue. Exhaust target stability was limiting the exhaust phasing till like 30 seconds thats why I was seeing the car slowly transition to the desired cam positions.

 

[markmurfie]

Emissions reduction comes in because the spark in that combination of tables is coming out the lowest. It is trying to get the cats up to temp, you dont need it doing this. You raise values in the tables how ever you see fit and it will start up with out this mode.

 

[tdstuart]

Emissions reduction comes in because the spark in that combination of tables is coming out the lowest. It is trying to get the cats up to temp, you dont need it doing this. You raise values in the tables how ever you see fit and it will start up with out this mode.

How does my logic sound for the mapped points?

And do you remember which table that is at?

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