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Old 03-30-2005, 08:23 PM   #1
buzz313th
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Default Turbo Dynamics Maps In Ecutek, and Street Tuner

Yes I have read the manual, so please don't recite the manual verbatim.

I am looking for some very detailed answers on the function of the Turbo dynamics maps.

1. When does the ECU reference the Burst Map and when does the ECU reference the Continuous Map.

I was told by an Ecutek tuner that the burst map is used only durring throttle transition. And the Continuous map is being used once throttle position is static.

2. What exactly is the mechanism that switches primary waistegate to zero after boost targets have been achieved? Is it the Dynamics maps?

3. Do the turbo dynamics maps control the rate at which the Waistegate duty cycle will climb to achieve waistegate duty cycle targets? Or is this rate fixed by the ecu?


Any help is appreciated.
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Old 03-30-2005, 11:01 PM   #2
crazymikie
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I'm add what I've seen so far to hopefull get some discussion going. This is what I've seen from experimentation, so please correct me if I'm wrong.

Turbo Dynamics - Burst
These corrections are applied when there are changes in throttle. The positive values are applied to the wastegate duty cycle when you are under target, while the negative values are applied when you are over target. If you are at lower RPMs, this map will have less effect (you can't achieve a lot of boost at 2000 rpm), but at higher rpms (figure 4000), you can easily spike if you suddenly go to 100% throttle if these values are too high.

Turbo Dynamics - Continuous
These corrections are applied one the throttle position is constant. The corrections are applied the same way (positive values increase wastegate duty cycle and negative values decrease wastegate duty cycle). If you go from 0% - 100% TPS at 2000 rpm, this map will do a lot more work than if you go from 0% - 100% TPS at 4000 rpm. Since at lower rpms, you will achieve 100% TPS at a lower boost value than at higher rpms, the continuous map will affect the boost curve until target boost is reached. At 4000 rpm, the burst corrections should get the boost most of the way to the target (I'm curious to know if there's a rule of thumb for how far....) and then the continuos map will ride the rest of the way. Once the boost level is reached (+- 2% on the stock scaling), the wastegate duty cycle is held constant based on the programmed value since the correction is 0%.

The ECU seems to like to make smooth linear progressions between programmed values, so it looks like these maps are responsible for creating curves as opposed to straight lines. Also, it looks like boost pressure lags WG duty cycle changes a little bit, so if you are debugging a problem, that's useful to remember.

I'm guessing the goal is to have a nice smooth 'handoff' from when the burst corrections end to when the continuous corrections take over. I've got lots more experimenting to do.

Feel free to correct away


Mike
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Old 03-31-2005, 01:54 AM   #3
crazymikie
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Here is a log I just took:

3rd and 4th gear pull at WOT

Here is a third and fourth gear pull at WOT.

Here are the values in my continuous turbo dynamics map:
Code:
-.20	-.10	-.05	-.01	0.00	.02	.05	.12	.20 	% Error
-5.00	-3.00	-2.00	-0.75	0.00	.18	.37	.95	3.14	WG Correction
My target boost is 16.3 for >95% throttle, so if here are the ranges for boost where the corrections will take place:
Code:
19.56	17.93	17.11	16.46	16.3	15.97	15.48	14.34	13.04 	PSI
-.20	-.10	-.05	-.01	0.00	.02	.05	.12	.20	% Error
-5.00	-3.00	-2.00	-0.75	0.00	.18	.37	.95	3.14	WG Correction
If you look at the boost curve in 4th gear, you can see that there is an initial burst while going to 100% throttle. Then boost rises up until about 12 PSI (this is the point at which it appears to go flat. This implies that the correction value for that range needs to be upped to smooth things out a bit.

Currently, it's .95, so I upped it to 1.05 to make sure that there would be a noticeable difference.

Also, it looks like things could be ramped up a bit harder in the third gear pull since there is no spiking. Currently, the correction is 3.14, so I will up that to 3.45 (10%) and I'll see what that will yield.

I'll make these corrections and log some more data tomorrow.

I think that the burst map could be modified a bit since I'm not getting that much of an initial 'push' or so it seems. I'll be playing with that a bit too.

Finally, I'm not quite hitting target boost (I'd like to run around 16psi), so I'm going to add a little more to the WG duty cycle.

Again, please feel free to chime in. I'm just guessing at this stuff.

Mike
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Old 03-31-2005, 08:35 AM   #4
ride5000
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wow. pretty complicated boost parameters! good luck, mike.

to others--remember he's running the gm solenoid so his #s are going to be quite different than the oem w/restrictor bleed system.

ken
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Old 03-31-2005, 12:05 PM   #5
crazymikie
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Thanks Ken!

My WG duty cycles are about 10% lower than what they typically are, so that's something to consider. I'll have some more data to post up later from the ride home from work.

Mike
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