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Tuning for temperature/elevation needed?

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Old Aug 17, 2007 | 02:15 PM
  #16  
TouringBubble's Avatar
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From: Chelsea, AL
Originally Posted by roger smith
...as long as the WDC numbers are all 100s of course.
I'm not sure where you got this from. Any of us here using the stock solenoid for boost control are using values in the mid range of the WGDC table. I'm personally using about 61.5% WGDC at peak boost.

The TBEC table will make adjustments both ways if the required conditions exist. I actually did a log the the WGDC correction value today based on some of Mrfred's recent findings.

In the most basic sense, this is how it works:

1) You set the desired load % with the boost desired and load offset tables.
2) You "rough in" the baseline boost curve with the WGDC table. This can only be done after you've modified the boost system by removing/modifying a pill.
3) Set the error correction table to correct for variables in weather.

I think #2 might be your problem .. have you modified the system or are you attempting to adjust the WGDC with the stock pills?
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Old Aug 19, 2007 | 09:26 PM
  #17  
lemmonhead's Avatar
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From: wexford,pa
you guys forgot about humidity!!!! humidity will create more dense air. 100 degrees in california is not the same as 100 degrees here in missouri.
so tuning just for temp will be different.
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Old Aug 20, 2007 | 04:45 AM
  #18  
Jorge T's Avatar
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From: Houston, TX
Humid air is less dense than dry air due to the water vapor effect.

Hot humid air is a double whamy to reduced HP.

"Water vapor effect: Humid air is lighter (less dense) exerting less pressure than dry air at the same temperature. This is because molecular weight of water is less than average molecular weight of dry air."
source:http://www.research.umbc.edu/~tokay/chapter5.html

Temperature also reduces the air density of air.
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Old Aug 20, 2007 | 07:32 AM
  #19  
Mr. Evo IX's Avatar
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From: Plano, TX
Originally Posted by TouringBubble
I'm not sure where you got this from. Any of us here using the stock solenoid for boost control are using values in the mid range of the WGDC table. I'm personally using about 61.5% WGDC at peak boost.

The TBEC table will make adjustments both ways if the required conditions exist. I actually did a log the the WGDC correction value today based on some of Mrfred's recent findings.

In the most basic sense, this is how it works:

1) You set the desired load % with the boost desired and load offset tables.
2) You "rough in" the baseline boost curve with the WGDC table. This can only be done after you've modified the boost system by removing/modifying a pill.
3) Set the error correction table to correct for variables in weather.

I think #2 might be your problem .. have you modified the system or are you attempting to adjust the WGDC with the stock pills?
What pill are you running to use 61.5% with the stock bcs? I have to be real close to 100% (except in the boost spike area which I pull a little duty from). If I ran 100% duty down the table with 159 BDEL and a 100 offset I would spike to around 24 tapering to 17 or 18. I have the solenoid side pill removed and the stock turbo pill installed right now. Soon I'm going to re-tune to use my AEM Truboost as last time I had it installed it was holding boost in the 240's almost to redline and it will let me change on the fly for weather / track adjustments if necessary. I've made the most power (Measured with DLL, running on the stock bcs spiking to 23.5psi). I also may give the 3 port a shot since I ordered one and it's sitting on my desk.
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Old Aug 20, 2007 | 08:26 AM
  #20  
lemmonhead's Avatar
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From: wexford,pa
yes correct, that is what I was trying to say,sorry about that.

Originally Posted by Jorge T
Humid air is less dense than dry air due to the water vapor effect.

Hot humid air is a double whamy to reduced HP.

"Water vapor effect: Humid air is lighter (less dense) exerting less pressure than dry air at the same temperature. This is because molecular weight of water is less than average molecular weight of dry air."
source:http://www.research.umbc.edu/~tokay/chapter5.html

Temperature also reduces the air density of air.
Reply
Old Aug 20, 2007 | 09:37 AM
  #21  
roger smith's Avatar
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From: Ventura County, CA
Originally Posted by TouringBubble
I'm not sure where you got this from. Any of us here using the stock solenoid for boost control are using values in the mid range of the WGDC table. I'm personally using about 61.5% WGDC at peak boost.

The TBEC table will make adjustments both ways if the required conditions exist. I actually did a log the the WGDC correction value today based on some of Mrfred's recent findings.

In the most basic sense, this is how it works:

1) You set the desired load % with the boost desired and load offset tables.
2) You "rough in" the baseline boost curve with the WGDC table. This can only be done after you've modified the boost system by removing/modifying a pill.
3) Set the error correction table to correct for variables in weather.

I think #2 might be your problem .. have you modified the system or are you attempting to adjust the WGDC with the stock pills?

Oops, sorry. I meant to say as long as WGDC numbers are NOT all 100s. That's what I was thinking in my head but the typing came out differently.

Just on the side, I'm running a GM 3-port and like it a lot even though I haven't completely tuned my boost curve yet.

Yeah. Hot humid air is a double whammy. But this morning it was like 56 degrees in my area and really foggy. I was thinking this is when cars can make the most power? because the fog is like water injection maybe.

I have a thought that tuning in low-moderate temps is better because then as you go into hotter areas your WGDC will have to increase to compensate. On the other hand if you tune in high temp and then drive in a low temp condition then your car will have to back off on the power. The first way you'll always feel increase in power, constant pulling. The other you'll feel the car start to pull then get weak maybe. But I understand the idea for tuning for the worst. I guess we should just keep in mind what kind of conditions we'll be in the majority of the time we decide to drive 'spirited.'
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