PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

*** Update 90mm TB + 48% Effective table

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Old Sep 22, 2005 | 10:40 AM
  #41  
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Hey Phil, how about that ETC tuning writeup you promised me a while back?

Could you send me the WHOLE explanation of the *0.48 thing? I'm not seeing it right now, could you take me through the process?
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Old Nov 24, 2005 | 08:26 PM
  #42  
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Originally Posted by RedHardSupra
Hey Phil, how about that ETC tuning writeup you promised me a while back?

Could you send me the WHOLE explanation of the *0.48 thing? I'm not seeing it right now, could you take me through the process?
Did any more ever come of this??? Specifically about C5s???

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Old Nov 24, 2005 | 10:43 PM
  #43  
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i think Nick Williams scaled his vs stock by a % and the airflow was the same before and after the swap. might want to pm him about it, im sure he could help
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Old Nov 25, 2005 | 12:21 AM
  #44  
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Originally Posted by SideStep
Did any more ever come of this??? Specifically about C5s???

For a C5 the "ETC Scalar Area" is adjusted - not the effective area.
For a 90 mm TB a value of .0320 works well for most.
Ported 78 mm TB would be between .0255 and .0320 ??
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Old Nov 25, 2005 | 12:27 AM
  #45  
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So all you need to do is just the Scaler area and not both? Cause someone kept saying the Effective area alone doesnt do anything but if you do both, it works like a champ.

Dixit
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Old Nov 25, 2005 | 08:03 AM
  #46  
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Just change the scaler, from my research I have not seen any change by adjusting the effective area.
Phil
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Old Nov 25, 2005 | 08:35 AM
  #47  
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Nick looked at my car as he was curious how my IAC was and when he logged it on my efi live i was running 60~61 at idle and he said that was fine and my car is running better than it ever was, haven't changed a thing in the IAC or TB tables.

also where in efi live is that scaler...I'm under idle and I see IAC area, idle speeds, start up correction, idle airflow, idle airflow parked....etc

Last edited by ZL1Killa; Nov 25, 2005 at 08:42 AM.
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Old Nov 25, 2005 | 08:37 AM
  #48  
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You don't need it since you don't have an electronic throttlebody.
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Old Nov 25, 2005 | 08:44 AM
  #49  
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so this effective area table and the scaler, which the scaler is the only thing you need to change Is only for electronic TB's....computer controlled. I was just wondering where it is.
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Old Nov 25, 2005 | 08:55 AM
  #50  
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ZL1Killa,
In EFI it is called {B4349} ETC Throttle Area Conversion. Use the Navigator to find it.
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Old Nov 25, 2005 | 09:00 AM
  #51  
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yeah scalar is for drive by wire (since if you log iac steps in them it will always say the same, it moves the TB blade for the airflow). effective area is what we need to do on our throttle bodys with a cable.
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Old Nov 25, 2005 | 12:26 PM
  #52  
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Originally Posted by Bink
For a C5 the "ETC Scalar Area" is adjusted - not the effective area.
For a 90 mm TB a value of .0320 works well for most.
Ported 78 mm TB would be between .0255 and .0320 ??

Cool, thanks!

I thought .48 was the value used???

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Old Nov 25, 2005 | 12:32 PM
  #53  
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That is the correct factor you use but for some reason the C5 doesn't even use that table. you can 0 it out and see no difference.
Phil
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Old Sep 26, 2008 | 01:26 PM
  #54  
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Call me stupid, but I don't understand the formula enough to use it myself.

What would it be usiing a 92mm throttle body?
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