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In an attempt to get my (alegedly) 140BHP A6 up to power I did a graph on vag-com this morning. Here is the result:
Now, it is possible I haven't done it right as it looks to me that there was a requested boost of 1.5 bar going on, which is more than my chipped S2 an achieve .
It looks like actual is way down on reqested but if 1.5 bar is right I'm not surprised .
Does this make any sense to anyone? Does it look like I've done the graph right?
_________________ 1997 Audi A6 Avant 2.5 TDI
1998 Audi 80 cabby 1.8
1995 Audi S2 Avant
AOC Member 1519
Duffelcoat Camped on the site
Joined: Jan 31, 2003
Posts: 266
Location: Dorset
Posted:
Thu Sep 09, 2010 3:23 pm
I dont know if that is '1.5' bar, but my Audi was requesting 2000 and getting it, but I am not sure if that is 2.0 bar as I don't know about that sort of thing.
I am sure Bladerunner will know the answer and be along at some point to fill us in!
gunman Bandwidth Buster
Joined: Sep 09, 2008
Posts: 524
Posted:
Thu Sep 09, 2010 5:39 pm
A chipped S2 can boost to 1.4 so I cant see a diesel hitting 2 bar. IIRC, a chipped |AEL will boost to 1.0bar. I took MBAR to be 'milli' bar, as in 1000 in a bar?
Is your car chipped at all?
_________________ 1997 Audi A6 Avant 2.5 TDI
1998 Audi 80 cabby 1.8
1995 Audi S2 Avant
AOC Member 1519
Duffelcoat Camped on the site
Joined: Jan 31, 2003
Posts: 266
Location: Dorset
Posted:
Thu Sep 09, 2010 5:42 pm
Mine is chipped, but I am sure that it was saying 2000 (Bananas) on the vagcom, but as you say I am not convinced it is bar!
gunman Bandwidth Buster
Joined: Sep 09, 2008
Posts: 524
Posted:
Thu Sep 09, 2010 6:18 pm
from what I can tell, mine is requesting between 1600 - 1700 max which could be about right as it isnt chipped (yet ).
_________________ 1997 Audi A6 Avant 2.5 TDI
1998 Audi 80 cabby 1.8
1995 Audi S2 Avant
AOC Member 1519
d-9 Camped on the site
Joined: Sep 06, 2008
Posts: 353
Posted:
Thu Sep 09, 2010 8:37 pm
Looking through the logs my chipped AEL requests up to about 1950.
_________________ _____________
Doug
'92 309 MI16
'96 A6 TDI Quattro
gunman Bandwidth Buster
Joined: Sep 09, 2008
Posts: 524
Posted:
Thu Sep 09, 2010 8:50 pm
does it get it?
_________________ 1997 Audi A6 Avant 2.5 TDI
1998 Audi 80 cabby 1.8
1995 Audi S2 Avant
AOC Member 1519
d-9 Camped on the site
Joined: Sep 06, 2008
Posts: 353
Posted:
Thu Sep 09, 2010 11:01 pm
After a bit of Excel magic:
Largest specified boost:-
Engine speed: 2549rpm
Charge (specified): 1968.5mbar
Charge (actual): 1999.2mbar
Largest actual boost:-
Engine speed: 3564rpm
Charge (specified): 1938mbar
Charge (actual): 2284.8mbar
quattromnc Camped on the site
Joined: Apr 05, 2005
Posts: 285
Location: Newton Mearns, Glasgow
Posted:
Fri Sep 10, 2010 7:50 am
Hi guys, normal atmospheric pressure is about 1 bar (varies a little with weather), does the vag com present bar including atmospheric pressure or bar over atmospheric pressure, if you take 1 bar away from your figures they start to make more sense. Not an expert in this so I may be completely wrong but something worth checking.
_________________ 1988 90 Quattro 2.2KV in white.
jubbly Camped on the site
Joined: Mar 04, 2008
Posts: 352
Posted:
Fri Sep 10, 2010 8:36 am
Mmmm
My chipped AEL is only hitting 14psi which is 1 bar
_________________ Gone but not forgotten A6 (C4) 1997 2.5 TDi Quattro Avant 140bhp circa 170bhp (Chipped, K&N, PP502 nozzles) S3 Chrome Mirrors
A6 (C5) 2.5 TDi Quattro Avant 220ps Remapped, Xenons, Sat nav+, Bluetooth, f+r sensors, MFSW, RS6 Leather
jubbly Camped on the site
Joined: Mar 04, 2008
Posts: 352
Posted:
Fri Sep 10, 2010 8:37 am
Also last time I asked Bladerunner i'm sure he told me the Chips from him were around 15 PSI boost.
_________________ Gone but not forgotten A6 (C4) 1997 2.5 TDi Quattro Avant 140bhp circa 170bhp (Chipped, K&N, PP502 nozzles) S3 Chrome Mirrors
A6 (C5) 2.5 TDi Quattro Avant 220ps Remapped, Xenons, Sat nav+, Bluetooth, f+r sensors, MFSW, RS6 Leather
gunman Bandwidth Buster
Joined: Sep 09, 2008
Posts: 524
Posted:
Fri Sep 10, 2010 8:58 am
I have a set of chips here waiting to be fitted but I want to get any boost problems sorted before fitting. It looksl like I have a problem, now is it the turbo or a leak? Need to do some investigating. Is it normal for the duty cycle of the N75 to stay static like in my graph?
_________________ 1997 Audi A6 Avant 2.5 TDI
1998 Audi 80 cabby 1.8
1995 Audi S2 Avant
AOC Member 1519
Duffelcoat Camped on the site
Joined: Jan 31, 2003
Posts: 266
Location: Dorset
Posted:
Sat Sep 11, 2010 9:11 am
quattromnc wrote:
Hi guys, normal atmospheric pressure is about 1 bar (varies a little with weather), does the vag com present bar including atmospheric pressure or bar over atmospheric pressure, if you take 1 bar away from your figures they start to make more sense. Not an expert in this so I may be completely wrong but something worth checking.
This sounds like the answer to me, 1 bar over atmospheric making 2 including.
BladeRunner Sadly no longer with us- RIP
Joined: Feb 03, 2008
Posts: 1257
Location: Chesterfield, Derbyshire
Posted:
Mon Sep 13, 2010 8:37 pm
Stock is 0.8 bar over atmospheric or there abouts chipped is 0.9 to 1.0 bar.. overboost throwing fault code in ECU if you have 1.1 to 1.2 bar for more than a short peak.
Mine was over boosting leading to fuel restriction control by the ECU.. when I bypassed all the electronics in trying to diagnose the cause it went like stink until I blew the lower IC hose, and I mean blew with a big bang
The overboost was caused by a seized wastegate valve, seized slightly open.
This could be your issue if it were stuck more open than mine so not able to create the overboost scenario, but it could also be blocked cat (less likely on 2wd than 4wd), or a boost leak or a problem in the boost control vacuum or electrics. or EGR stuck open partially open, damaged turbo etc etc hard to archair diagnose really need the car
_________________
I Have Genuine Vag Com Hex Can 2+2, Vag Tacho & Snap-on Modis latest software
gunman Bandwidth Buster
Joined: Sep 09, 2008
Posts: 524
Posted:
Mon Sep 13, 2010 8:55 pm
Cheers Jon, speaking of blocked cats , I'll drop you a PM
_________________ 1997 Audi A6 Avant 2.5 TDI
1998 Audi 80 cabby 1.8
1995 Audi S2 Avant
AOC Member 1519
BladeRunner Sadly no longer with us- RIP
Joined: Feb 03, 2008
Posts: 1257
Location: Chesterfield, Derbyshire
Posted:
Mon Sep 13, 2010 8:59 pm
yes sorry been chaotic here, I couldn't find it too, but have now so will find cost, pm me your address if it's uk post code parcel to go have been excellent recently,, also i have some cruise pins it was you that asked???
_________________
I Have Genuine Vag Com Hex Can 2+2, Vag Tacho & Snap-on Modis latest software
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