TDStuart Tuning Adventure

[engineermike]

@WildHorse the stock cams are 211 at .050. His cams are IIRC 233 and 237 at .050, give or take a couple.

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[Pistol_91]

Oh no, it's much better hearing 6 or 8 people all saying different things at the same time, involving calculus level mathematics and at least pascal level programming skills. It's much more helpful learning it that way. That's how I remember school-4 different teachers in each subject all telling me different things at the same time. It works very well that way.

Were you in special classes? LOL, just kidding.
Nobody is really giving conflicting information, just adding on top of whatever subject it is.

 

[Pistol_91]

Have you guys tried rescaling Calculated MAP Max down to a lower number closer to what MAP hes actually getting near. Maybe be easier and faster to tune SD that way with populated information then when everything looks square, rescale it back up to stock and infer higher MAP for high load?

 

[K4fxd]

What is your y axis?

 

[Pistol_91]

Copied histogram from the SD calculator in HPT, I dont have PCMtec, it is MAP

 

[tdstuart]

Here is a full log that should have good data. I decided on MP19 to start with. Seems okay for drivability but you would probably want a more efficient MP for lower load and a "more powerful" MP for higher load. I didn't get good data for 6500+ rpm, car was getting hot and data log was getting long, wanted to make sure I had it setup right first.

Log attached, hopefully I got all the needed parameters.

Edit: I rescaled the rpm range for the SD tables. Tune file attached

 

[tdstuart]

Ill see if I can do the calculations myself

 

[engineermike]

I have to ask….why mp19? What is it about 20/40 cam timing that you think makes it most optimum?

 

[tdstuart]

I have to ask….why mp19? What is it about 20/40 cam timing that you think makes it most optimum?

You recommended 25/50. There is no MP for that so I thought 20/40 would be close and it has okay driving characteristics. If you think I am fine rewriting a MP cam value or have another MP you would recommend let me know.

 

[tdstuart]

Here is the data chart:

Pretty terrible for usable data haha. Not sure if I did something wrong or if the car is giving me weird data because it doesn't like the cam angle? There are obviously a few outliers I could remove but a lot of the data is in a blob, not a line like I would expect and what @markmurfie showed in his example. My excel file is attached.

 

[tdstuart]

Here is the data chart:

Pretty terrible for usable data haha. Not sure if I did something wrong or if the car is giving me weird data because it doesn't like the cam angle? There are obviously a few outliers I could remove but a lot of the data is in a blob, not a line like I would expect and what @markmurfie showed in his example. My excel file is attached.

After thinking about it I think I forgot to filter it for only MP19 data. I will have to redo it and try again

 

[engineermike]

After thinking about it I think I forgot to filter it for only MP19 data. I will have to redo it and try again

If you’ve isolated mp19, why would you have to filter it?

 

[tdstuart]

If you’ve isolated mp19, why would you have to filter it?

Idle and wot are in other MP. So I just have to filter those out. It’s pretty easy I just forgot.

 

[markmurfie]

Here is the data chart:

Pretty terrible for usable data haha. Not sure if I did something wrong or if the car is giving me weird data because it doesn't like the cam angle? There are obviously a few outliers I could remove but a lot of the data is in a blob, not a line like I would expect and what @markmurfie showed in his example. My excel file is attached.

For 1025 RPM and MP 19 here is what I got from your full log. It's much better data.

I will get the rest later.

 

[tdstuart]

For 1025 RPM and MP 19 here is what I got from your full log. It's much better data.

I will get the rest later.

Not sure what I am doing wrong. I redid the cylinder airmass so it should be right now. My Quad is positive, slope is off and offset is off. I also have still a blob while you have a nice cluster.

Could you point out what I am missing? I don't understand why our numbers are so far off.

MP19 > 90%:

MP19 >80%:

Manual MP19 >80%:

Attached is a sheet with me manually calculating it. I assume cylinder airmass is (maf/rpm/4).

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