S6 Boost??

Booty · 11-11-09, 12:22 AM

What boost pressure ( bar ) should my S6 be pushing when fully on song?. She runs around 297bhp and is chipped with an intercooler mod. Seems a bit sluggish all of a sudden.

spink · 11-11-09, 01:41 AM

297? have you seen that on a dyno yourself? what chips are in it? thats a very healthy engine if its accurate.On overboost you ought to be seeing 2.4 bar on the dash gauge.Although a mates S4 only seems to read 2.2 but is as quick as another mates S6 that shows 2.4 both running the same chips

quattrokid · 11-11-09, 05:22 AM

my (now Ben's) UrS4 had 2.2bar when Ben put the diverter recirc valve on the right way round! mine had a Nothelle remapped ecu but never did find out what it produced.

Have you got an air leak?

BW2309 · 11-11-09, 08:55 AM

Hey up Booty.

Your S6 should read about 2.2 - 2.4 max. This will tail off to about 1.9 - 2.0 at higher rpm. Remember this is atmospheric plus positive manifold pressure so at 2.2BAR your are actually getting 1.2BAR actual boost pressure.

Even chipped about 1.4BAR boost is usual.

PeterB · 11-11-09, 12:12 PM

Quote:

Originally Posted by quattrokid

my (now Ben's) UrS4 had 2.2bar when Ben put the diverter recirc valve on the right way round! mine had a Nothelle remapped ecu but never did find out what it produced...

Hmmm, probably done when we were trying to find the missing boost Rich. Some S2'ers had said that they sometimes work better the other way round. Didn't make any difference either way round at the time, so I just left it.

Btw, Nothelle said that the chips would have originally produced 265 PS and 380 Nm torque (limited due to the auto box).

quattrokid · 11-11-09, 02:06 PM

Quote:

Originally Posted by PeterB

Hmmm, probably done when we were trying to find the missing boost Rich. Some S2'ers had said that they sometimes work better the other way round. Didn't make any difference either way round at the time, so I just left it.

Btw, Nothelle said that the chips would have originally produced 265 PS and 380 Nm torque (limited due to the auto box).

thanks Peter

Booty · 11-11-09, 11:27 PM

Quote:

Originally Posted by spink

297? have you seen that on a dyno yourself? what chips are in it? thats a very healthy engine if its accurate.On overboost you ought to be seeing 2.4 bar on the dash gauge.Although a mates S4 only seems to read 2.2 but is as quick as another mates S6 that shows 2.4 both running the same chips

Hey up Spink. Custom Code did the work via PSI in Stoke and they rolling roaded it at Collins Motorsport. She was very very quick up until a couple of weeks ago when she seems to slowly have been getting more sluggish. She will rev but it doesn't do a great deal. She really used to pull your face off but that's not happening at present.

I keep meaning to go around all the hoses and check for leaks......

Thanks for the figures Ben I will see what the readout shows tomorrow en route to work.

11-11-09, 05:22 AM	#3
quattrokid 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Ayrshire Posts: 9,654	my (now Ben's) UrS4 had 2.2bar when Ben put the diverter recirc valve on the right way round! mine had a Nothelle remapped ecu but never did find out what it produced. Have you got an air leak? __________________ RS4 B5 (wife's / ours now ) S3 8L Imola Yellow S3 8L Nogaro blue UrWR SOLD UrS4 saloon (SOLD again) S4 Cabrio (SOLD) A4 cabrio 2.5 V6tdi (SOLD) 80 cabrio 2.6 V6 SOLD 90 quattro 10v SOLD 100 2.2e SOLD FOUNDING MEMBER the 200,000 Plus miles Club

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11-11-09, 01:41 AM	#2
spink Senior Member Classic Audi Club Member Join Date: Dec 2007 Location: yorkshire Posts: 1,525	297? have you seen that on a dyno yourself? what chips are in it? thats a very healthy engine if its accurate.On overboost you ought to be seeing 2.4 bar on the dash gauge.Although a mates S4 only seems to read 2.2 but is as quick as another mates S6 that shows 2.4 both running the same chips

11-11-09, 08:55 AM	#4
BW2309 Banned Join Date: Sep 2008 Location: Derby Posts: 1,245	Hey up Booty. Your S6 should read about 2.2 - 2.4 max. This will tail off to about 1.9 - 2.0 at higher rpm. Remember this is atmospheric plus positive manifold pressure so at 2.2BAR your are actually getting 1.2BAR actual boost pressure. Even chipped about 1.4BAR boost is usual.