TDStuart Tuning Adventure

[Pistol_91]

Yeah IATs definitely look better. Very hot out there... lol

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[ice445]

I dont want to get side tracked on it again, but if this is the stock intake, the IATs look amazing.
Drop from 125-130 down to just above 100 very quickly once air starts flowing. then seem to stay there and dont really start to climb back up like they were on those older logs.

The stock intake is honestly god tier when it comes to shedding IAT. They really worked some magic with it.

 

[engineermike]

This load mis-match issue is unique, and I don't think anyone actually understands what's going on there. However, what we do know is that the SD model is basically a MAP vs MAF (pressure vs flow) relationship. We also know that the SD model is stock gen 2, the manifold is gen3, and the cams are comp stage 3, so the pressure vs flow relationship is not accurate. I think I would start trying stealing Gen3 or even Voodoo SD models to try and see if the load matches any better.

 

[tdstuart]

If you dont want it to add 10 degrees then either up your borderline spark or lower max advance. It wants more spark, thats not a bad thing.

No it’s 10* of positive knock resulting in really low spark. If you look through the logs above I think it’s in the raised limit not working on the first pull in first gear.

No idea why it’s upset because if I get off the throttle and shift to second and floor it, it’s fine and starts adding in a bunch of timing

 

[tdstuart]

Ah I see it now. I was only looking at the log near WOT. Looks like it was during wheel spin possibly? Strange.

Not wheel spin. It’s like the car is just upset and doesn’t want to let up on the knock until I take my foot fully off the gas or shift gears.

 

[HKusp]

No it’s 10* of positive knock resulting in really low spark. If you look through the logs above I think it’s in the raised limit not working on the first pull in first gear.

No idea why it’s upset because if I get off the throttle and shift to second and floor it, it’s fine and starts adding in a bunch of timing

I say...

 

[tdstuart]

Set both Baro max and min to 30.
Add barometric pressure to the log.
See if that fixes your TP model being limited.

This “fixed” it.

For those following along when the car is reading low load the effective throttle area is low, and the map estimated and from desired airmass is low. ETC torque request is also low and indicated torque reference is low.

Because of these things being low it looks like the car is ignoring the maf values from the maf period table and is lowering how much air it thinks it’s getting causing the car to be a little lean (no matter how much I add to the maf curve).

I see no issues with the throttle body voltages or angles that would indicate a throttle body issue.

 

[tdstuart]

Logs incoming...

The ones that say "Working" have the load working properly. I did this by raising the baro min to 30 to match the max. Seems to work consitently. The ones that don't say "Working" have the baro min set to stock and the load is not working correctly.

I tried to log all the parameters I could but don't see any differences besides the ones I described above.

Good thing I have the experts @markmurfie and @engineermike to help haha

 

[GregO]

I thought the max and min baro matched setting was temporary ?
Post #457
“Setting this max and min to the same is a temporary measure to allow you to tune your SD model properly.
If this even fixes what ever is limiting your TP models MAP estimate.”

Have your IAT stabilized with the OEM air box ?

 

[tdstuart]

I thought the max and min baro matched setting was temporary ?
Post #457
“Setting this max and min to the same is a temporary measure to allow you to tune your SD model properly.
If this even fixes what ever is limiting your TP models MAP estimate.”

Have your IAT stabilized with the OEM air box ?

Yep it is a temporary thing until I can figure out what the car isn’t liking.

And as far as I can tell the iat looks fine. Could be the new maf I put in too

 

[tdstuart]

I might try updating the intake manifold volume, they are pretty different

 

[engineermike]

So the baro is learned based on tb characteristic and manifold pressure. Manifold pressure is calculated using the SD model, which is known to be inaccurate. So does this mean that the SD model is the culprit?

 

[engineermike]

I might try updating the intake manifold volume, they are pretty different

Manifold volume mainly just controls the rate the throttle blade moves in dynamic conditions. Smaller volume in the tune results in slower blade movement.

 

[tdstuart]

So the baro is learned based on tb characteristic and manifold pressure. Manifold pressure is calculated using the SD model, which is known to be inaccurate. So does this mean that the SD model is the culprit?

I think that's what @markmurfie was pointing too.

From my research, the manifold volume might influence the speed density calculations so I want to try updating that.

 

[Pistol_91]

I think that's what @markmurfie was pointing too.

From my research, the manifold volume might influence the speed density calculations so I want to try updating that.

Does pcmtec use a speed density calculator or no?

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