help me figure out if my n75 is going bad...logs inside

jwolf::ASP S3 · 05-19-2006, 10:36 AM

trying to figure out if my n75 is causing my low boost problems. i pressure tested the car about a month ago and everything looked good. Im only making 16psi at redline. Sometimes i spike to 24 and taper down, and sometimes i spike to 20 and taper down. Im not throwing any codes and i have new 710Ns. I logged block 114 but im not sure how to interpret n75 duty cycles. TIA Fats times are also down to 4.0-4.1 when they used to be 3.5-3.6

Ochlockonee · 05-19-2006, 10:42 AM

EdyJun · 05-19-2006, 11:05 AM

jwolf::ASP S3 · 05-19-2006, 11:08 AM

Flyboy · 05-19-2006, 11:58 AM

I'd expect the N75 duty cycle to increase as the ECU tries to increase the actual boost toward requested.

Have you tried disconnecting the ECU and then logging that stuff after it has been reset? Might be interesting to see what happens when the system has a fresh look at the conditions.

05-19-2006, 10:36 AM	#1
jwolf::ASP S3 Junior Member Garage is empty, add now Join Date: May 2004 Posts: 1,122	help me figure out if my n75 is going bad...logs inside trying to figure out if my n75 is causing my low boost problems. i pressure tested the car about a month ago and everything looked good. Im only making 16psi at redline. Sometimes i spike to 24 and taper down, and sometimes i spike to 20 and taper down. Im not throwing any codes and i have new 710Ns. I logged block 114 but im not sure how to interpret n75 duty cycles. TIA Fats times are also down to 4.0-4.1 when they used to be 3.5-3.6 __________________ ASP DPs w/ AWE Twin1 Exhaust Southbend Stg5 Feramic clutch AWE LWFW H&R Bilstein Samco EVO intake Neuspeed SS APR Snub RS4 MM RS4 Front Bumper and grille SSR Comps, Pilot cup sport:Track OZ SL Custom Paint, Nitto 555:Street 3.29 FATS on 100oct

05-19-2006, 10:42 AM	#2
Ochlockonee Member Garage is empty, add now Join Date: Mar 2004 Posts: 2,951	If you have a boost leak your maf #s and o2 values would be high while boost is low. __________________ "No, a flux capacitor is not compatible with a ham sandwich."

05-19-2006, 11:05 AM	#3
EdyJun AudiWorld Super User Garage is empty, add now Join Date: Dec 2002 Posts: 2,719	Are you running TCD and MBC? can we get more logs? __________________ 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>

05-19-2006, 11:08 AM	#4
jwolf::ASP S3 Junior Member Garage is empty, add now Join Date: May 2004 Posts: 1,122	running TCD, no MBC. What would you like to see? __________________ ASP DPs w/ AWE Twin1 Exhaust Southbend Stg5 Feramic clutch AWE LWFW H&R Bilstein Samco EVO intake Neuspeed SS APR Snub RS4 MM RS4 Front Bumper and grille SSR Comps, Pilot cup sport:Track OZ SL Custom Paint, Nitto 555:Street 3.29 FATS on 100oct

05-19-2006, 11:58 AM	#5
Flyboy AudiWorld Super User Garage is empty, add now Join Date: Apr 2000 Posts: 3,686	Have you ever adjusted your N75? I'd expect the N75 duty cycle to increase as the ECU tries to increase the actual boost toward requested. Have you tried disconnecting the ECU and then logging that stuff after it has been reset? Might be interesting to see what happens when the system has a fresh look at the conditions. __________________ www.MyAudiS4.com/vast-sucks (Updated: 20 Jan 2012) Stock -> APR Stg1/2 -> GIAC Stg2 -> APR K04 Stg3 -> EPL TiAL 605 -> V̶A̶S̶T̶ EPL/Frankenturbo F4H

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