Ok i just want to know what you guys set yours to if you alterd them. Boost Error correction seems pretty self explanitory, although i want to see what numbers you guys put as boost goes up.

Also as far as desired engine load, does that play a role in boost, or how well boost is held to redline

I altered both, went for a run, no knock, yet i watched my boost gauge it was holding 20 psi solidly at certain points, only taperd down way less. I wanted to know if that was because of desired engine load or boost error correction or a combo of both?

 

BEEN OVER MANY TIMES thats probly why your not getting answers

 

i dont run the stock turbo but as far as iv seen most tuners just max out 159 and 319 for boost desired engine load and max wastegate duty, on my friends car at least with the stock turbo that does about 21 pounds and holds pretty solid

 

^^lol newbie telling the Evolving member to search.

 

Ok well here is the deal, i did search and what i discovered didnt make sense.
I also got like 20 different answers for the same thing.

1. So If boost control load offset + desired engine load= load cell target, how come on a stock evo from the factory say at 4000 rpms desired engine load is 143.8 and boost control load offset is 60. 60+143.8=203, ok so a load target of 203 right? Well in reality you hit like 235 ish, thats a pretty big difference.

Now my 2nd question is why is there 3 desired engine load maps. how do they correlate with one another. is there a perticular gear it uses # 1 instead of #2 or 3 or whats up with that.

3rd of all can somebody solidly explain the Turbo Boost error correction and how it correlates with Max Wastegate Duty?

 

well?

 

Is it just spiking at 235ish and coming back down, or is it staying above 230? If it is staying above 230 I would guess that the value in the error correction is not enough to lower the wastegate duty value enough to reach the desired load value. I guess one thing you can try to do is change some of the positive values in the error correction map and see if that helps, for example,
0.0 = 0.0
2.5 = -1.5
5.0 = -3.5
7.5 = -5.0
10.0 = -6.5
12.5 = -13.0
15.0 = -13.0 -> -15.0
17.5 = -13.0 -> -17.0
19.8 = -13.0 -> -19.0
something like that.

Not sure, just know that #2 is the one used.

I believe the error correction values are used to adjust the wategate duty value; which error correction value is used is based on a difference between the desired load(desired engine load + load offset) and the actual load the ecu calculates. Whether or not the difference between the desired load and actual load is based on the % difference, or just the difference between the two values I am not sure.

 

so out of the 3 desired engine load maps, only number 2 is used?


Also what do you mean which error correction value is used?

Are you saying the difference between desired engine load and actual engine load is = to the Boost error % ( left side of turbo boost error correction?)

lets say your at 5.0% meaning the difference between desired and actual load. Now the value to that right of that, what would that number do? negative or positive. Is it suppose to raise or lower the %?

 

also those percentages are valued the same as they are in the Ignition and fuel tables right? 20% up goes to the next cell in the table right? or do they mean something else on the boost error correction.

 

I said I dont know if values on the left side of the boost error correction are the % difference between the desired engine load, and the actual engine load; or if they are the difference between the values for the desired engine load and actual engine load (ex: 235-205=30).

 

ok that part i get.

Now lets say it hits the positive 15 or whatever. now the number you set on the rigth side, would do what ? lets say next to positive 15 you set 8. Now what would that do? is the right side number represent how either to add or subtract load. Positive = Add, negative = subtract? Also if this is the case the stock boost control solenoid is a pretty active system.

Also i was wondering does it hold boost at a certain area by opening and closing the wastegate kind of in like cycles. or does it actually fluctuate it at a point,
what i mean by this, lets say 0 is closed and 1 is open. can the wastegate be between 0 and 1 lets say its .75 meaning its 75% open?

 

There is some great info in this post

https://www.evolutionm.net/forums/sh...6&page=3&pp=15

posts #33 - #42

Here is a summary:

So with that equation the boost solenoid would run a WG duty of 90, right?

now if this happened..

Load (car is experiancing) - 260 @ 3500rpm

# in desired load table - 159.4 @ 3500rpm
# in load offset - 80 @ 3500rpm
......................... = 239.4 @ 3500rpm

Now the load is +21 off

Turbo error correction @ +21% is (X) WG duty

So a WG duty of 90, would actully be 90 + X, right??


I now know why puttin all 159s in the desired load table make taper go away..

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I am currently hitting ~23 psi peak and tapering to ~ 17 - 18 by redline. I need to put in a new pill and adjust my WG cycles and hopefully be able to hold more boost in the higher RPMs...Good luck & hope this helped....