(17964) Charge Pressure Contr. Negative vs. (1796) Charge Pressure Contr. Positive

EdyJun · 10-10-2005, 10:54 AM

Can some one explain with great detail, what are the differences between these two?

17964 P1556 Charge Pressure Contr. Negative Deviation

vs.

17965 P1557 Charge Pressure Contr. Positive Deviation

I.e. If the difference between spec and actual boost is great than xx Mbar Negative Deviation is detected.

Edy

vegasS4 · 10-10-2005, 11:09 AM

the system is getting more boost then requested (ie Ko4's on Ko3 software)

[badmoon] · 10-10-2005, 11:17 AM

EdyJun · 10-10-2005, 11:18 AM

SebGood is 100% stock except for GIAC X and he is getting P1557 - Charge Pressure Contr. Positive Deviation. He is not using K03 software on K04s how do you explain that? Boost leak, weather temp, or something else?

First day on the track - 4 DTCs

EdyJun · 10-10-2005, 11:24 AM

dscottjr · 10-10-2005, 11:25 AM

[badmoon] · 10-10-2005, 11:25 AM

Take a look at some ECUx logs and you'll see there's a slight actual boost spike off throttle...had something to do with bad BPVs I believe.

[badmoon] · 10-10-2005, 11:26 AM

EdyJun · 10-10-2005, 11:27 AM

ryans4 · 10-10-2005, 11:28 AM

10-10-2005, 10:54 AM	#1
EdyJun AudiWorld Super User Garage is empty, add now Join Date: Dec 2002 Posts: 2,719	(17964) Charge Pressure Contr. Negative vs. (1796) Charge Pressure Contr. Positive Can some one explain with great detail, what are the differences between these two? 17964 P1556 Charge Pressure Contr. Negative Deviation vs. 17965 P1557 Charge Pressure Contr. Positive Deviation I.e. If the difference between spec and actual boost is great than xx Mbar Negative Deviation is detected. Edy __________________ 2000 Audi S4 STG 3 FATS = 3.66 w/ 91 oct AIM: EdyJun 11 September 2001 In their honor. In their memory. <font color="red">---------------------------------------------------------- <u><big> <a href="http://homepage.mac.com/edyjun1/S4/index.htm">EdyJun's S4 Directory (FAQ, DIY, Info, Tips and Help) </a> </big> </u>---------------------------------------------------------- </font>

10-10-2005, 11:09 AM	#2
vegasS4 Member Garage is empty, add now Join Date: Nov 2000 Posts: 4,143	Negative means the system is not getting the requested boost (usually boost leak). Positive means.. the system is getting more boost then requested (ie Ko4's on Ko3 software) __________________ L10 AWE Stage III tip

10-10-2005, 11:17 AM	#3
[badmoon] Senior Member Garage is empty, add now Join Date: Sep 2002 Posts: 6,020	I think the deviation is 300mbar...when actual is positive or negative of requested

10-10-2005, 11:18 AM	#4
EdyJun AudiWorld Super User Garage is empty, add now Join Date: Dec 2002 Posts: 2,719	Positive means: the system is getting more boost then requested (ie Ko4's on Ko3 software) SebGood is 100% stock except for GIAC X and he is getting P1557 - Charge Pressure Contr. Positive Deviation. He is not using K03 software on K04s how do you explain that? Boost leak, weather temp, or something else? First day on the track - 4 DTCs __________________ 2000 Audi S4 STG 3 FATS = 3.66 w/ 91 oct AIM: EdyJun 11 September 2001 In their honor. In their memory. <font color="red">---------------------------------------------------------- <u><big> <a href="http://homepage.mac.com/edyjun1/S4/index.htm">EdyJun's S4 Directory (FAQ, DIY, Info, Tips and Help) </a> </big> </u>---------------------------------------------------------- </font>

10-10-2005, 11:24 AM	#5
EdyJun AudiWorld Super User Garage is empty, add now Join Date: Dec 2002 Posts: 2,719	Thank you, this is more like it, some #s to back it up... __________________ 2000 Audi S4 STG 3 FATS = 3.66 w/ 91 oct AIM: EdyJun 11 September 2001 In their honor. In their memory. <font color="red">---------------------------------------------------------- <u><big> <a href="http://homepage.mac.com/edyjun1/S4/index.htm">EdyJun's S4 Directory (FAQ, DIY, Info, Tips and Help) </a> </big> </u>---------------------------------------------------------- </font>

10-10-2005, 11:25 AM	#6
dscottjr AudiWorld Super User Garage is empty, add now Join Date: Sep 2002 Posts: 14,593	This # is software dependent. __________________ 00 S4, Euro spider hose mod!! 04 allroad, needs rs6 intercoolers, k04s and a cargo box...

10-10-2005, 11:25 AM	#7
[badmoon] Senior Member Garage is empty, add now Join Date: Sep 2002 Posts: 6,020	Keep in mind this can happen in off throttle situations... Take a look at some ECUx logs and you'll see there's a slight actual boost spike off throttle...had something to do with bad BPVs I believe.

10-10-2005, 11:26 AM	#8
[badmoon] Senior Member Garage is empty, add now Join Date: Sep 2002 Posts: 6,020	thanks for the info. I wasn't sure, I thought someone had mentioned that number :P

10-10-2005, 11:27 AM	#9
EdyJun AudiWorld Super User Garage is empty, add now Join Date: Dec 2002 Posts: 2,719	I c, I take it after market chips have a higher threshold. (i.e.instead of 300 mbars, its 500 mbars) __________________ 2000 Audi S4 STG 3 FATS = 3.66 w/ 91 oct AIM: EdyJun 11 September 2001 In their honor. In their memory. <font color="red">---------------------------------------------------------- <u><big> <a href="http://homepage.mac.com/edyjun1/S4/index.htm">EdyJun's S4 Directory (FAQ, DIY, Info, Tips and Help) </a> </big> </u>---------------------------------------------------------- </font>

10-10-2005, 11:28 AM	#10
ryans4 AudiWorld Super User Garage is empty, add now Join Date: Apr 2000 Posts: 7,308	Bentley says +/- 20 mbar deviation (for stock ecu) __________________

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