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Overboosting!! :(

Old Aug 12, 2009 | 07:39 PM
  #16  
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Originally Posted by Silversx
remember to use the map conversion tool from cobb after you edit the map before you load to your ap
I can't seem to find this tool... I've never heard of it

I just drag and dropped the edited map onto my AP manager and it went in, will this not work?

Edit; nvm found it.

Last edited by weebles; Aug 12, 2009 at 07:46 PM.
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Old Aug 12, 2009 | 08:18 PM
  #17  
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Yes, that is the table. Just set the cell below -20 from 5 to 0. Go do a log and tell us if it worked for you.
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Old Aug 12, 2009 | 08:44 PM
  #18  
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Okay, so I edited a Stage 1 91 octane HKSPF map as you suggested (I used the 91 octane map since I was experiencing ALOT of knock yesterday even though I run 94 octane fuel)

Here is the log file.. http://www.sendspace.com/file/00vaml

I flashed the car and went for a spin, I did a data log of some around town driving. I went WOT a couple of times in 3rd/4th gear and again I over boosted. 25/26.5 psi when boost target for this map is 23.5
*See cells 189, 214

I didn't get any knock when overboosting but I did have a section where I experienced 1-2 knock for a couple seconds.
*See cells 448-457

The other day I dropped a socket behind my engine when working on the downpipe, it fell in and I could not find it to get it out... It's still in there and I can hear it rolling around and hitting something when I either brake hard or accelerate, could this effect my knock reading at all? Sorry if that's a completely retarded question but it's really the only thing that's changed on my car since this knock began.. that and a oil change / service by the dealer.
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Old Aug 12, 2009 | 09:20 PM
  #19  
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This is not a proper log. You barely stabbed the throttle. Do a WOT log in 4th gear from 2500 rpm to 7300 rpm. Do not lift. WOT means pedal to the metal. Find a long flat freeway on-ramp to do this. Or find an abandoned stretch of road.

1-2 counts of knock is nothing to worry about. The stock tune has 1-2 counts of knock.

Also do NOT log absolute pressure, baro pressure, Intake Air temp, Accel pedal, Vehicle speed. These will simply slow your logger down and you do not need them.

If you are concerned about damaging your engine, then your better off flashing a stock map and leaving things alone. Either log properly or do not log at all.
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Old Aug 12, 2009 | 09:23 PM
  #20  
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Originally Posted by nj1266
This is not a proper log. You barely stabbed the throttle. Do a WOT log in 4th gear from 2500 rpm to 7300 rpm. Do not lift. WOT means pedal to the metal. Find a long flat freeway on-ramp to do this. Or find an abandoned stretch of road.

1-2 counts of knock is nothing to worry about. The stock tune has 1-2 counts of knock.

Also do NOT log absolute pressure, baro pressure, Intake Air temp, Accel pedal, Vehicle speed. These will simply slow your logger down and you do not need them.

If you are concerned about damaging your engine, then your better off flashing a stock map and leaving things alone. Either log properly or do not log at all.
Gotchya.

My bad, will do.
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Old Aug 13, 2009 | 03:19 AM
  #21  
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I have my car tuned with ECUflash and hit 26.5psi every day. The car is fine and barely gets 1 count of knock.
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Old Aug 13, 2009 | 06:59 PM
  #22  
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Originally Posted by nj1266
This is not a proper log. You barely stabbed the throttle. Do a WOT log in 4th gear from 2500 rpm to 7300 rpm. Do not lift. WOT means pedal to the metal. Find a long flat freeway on-ramp to do this. Or find an abandoned stretch of road.

1-2 counts of knock is nothing to worry about. The stock tune has 1-2 counts of knock.

Also do NOT log absolute pressure, baro pressure, Intake Air temp, Accel pedal, Vehicle speed. These will simply slow your logger down and you do not need them.

If you are concerned about damaging your engine, then your better off flashing a stock map and leaving things alone. Either log properly or do not log at all.
Okay I did two pulls in 4th gear, hope these are a little better.

http://www.sendspace.com/file/a3z15j

This is running a stage 1 91 octane map with 94 octane fuel. It also has the -20 Load cell modified to 0 as you suggested. The boost target for this map is 23.5 psi, so I'm still overboosting a little bit but the numbers are looking much much better that is for sure. Do you suggest I modify that load cell on the stage 2 93 octane map when I start to run it again? And sorry for being completely ignorant but what exactly is that changing?!

Either way thanks for the help, I appreciate it.
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Old Aug 13, 2009 | 08:18 PM
  #23  
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Originally Posted by weebles
Okay I did two pulls in 4th gear, hope these are a little better.

http://www.sendspace.com/file/a3z15j

This is running a stage 1 91 octane map with 94 octane fuel. It also has the -20 Load cell modified to 0 as you suggested. The boost target for this map is 23.5 psi, so I'm still overboosting a little bit but the numbers are looking much much better that is for sure. Do you suggest I modify that load cell on the stage 2 93 octane map when I start to run it again? And sorry for being completely ignorant but what exactly is that changing?!

Either way thanks for the help, I appreciate it.
Your not going to hit the exact boost target, but your hitting 24.xx psi. Your not going into 25 psi. This is a very good boost peak on 93 octane. I tune 24-25 psi on 91 octane, so you are good to go.

I will try and give you a simple explanation on my fix to your problem. Cobb set up the boost target on these map high and reduced the WGDC to compensate for the high target. So the ECU cannot meet that boost target. For example, your target boost at peak is 242-250 load + 100 load offset = 342-350. You are never going to hit that load target with your current mods. Your hitting 260-272 (depending on the log) at peak, so your below the target boost.

So the ECU looks up the turbo dynamics table and sees that your off your target boost. That is the negative side of the table from -20 to -2 and ADDS WGDC to what is in the coarse and fine tables. The ECU cannot add more than 10% WGDC. The -20 load cell tells the ECU that your off by more than 20 load points and to add 5% WGDC. When that happens you get the spike in the boost.

When we zeroed the -20 load cell, the ECU could no longer add the 5% to the WGDC. So your boost dropped. The problem was solved.
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Old Aug 13, 2009 | 08:50 PM
  #24  
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Originally Posted by nj1266
Your not going to hit the exact boost target, but your hitting 24.xx psi. Your not going into 25 psi. This is a very good boost peak on 93 octane. I tune 24-25 psi on 91 octane, so you are good to go.

I will try and give you a simple explanation on my fix to your problem. Cobb set up the boost target on these map high and reduced the WGDC to compensate for the high target. So the ECU cannot meet that boost target. For example, your target boost at peak is 242-250 load + 100 load offset = 342-350. You are never going to hit that load target with your current mods. Your hitting 260-272 (depending on the log) at peak, so your below the target boost.

So the ECU looks up the turbo dynamics table and sees that your off your target boost. That is the negative side of the table from -20 to -2 and ADDS WGDC to what is in the coarse and fine tables. The ECU cannot add more than 10% WGDC. The -20 load cell tells the ECU that your off by more than 20 load points and to add 5% WGDC. When that happens you get the spike in the boost.

When we zeroed the -20 load cell, the ECU could no longer add the 5% to the WGDC. So your boost dropped. The problem was solved.
Awesome! Thanks for the explanation and again thanks for the help
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