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Just dynoed the B7 RS4. Got 213wkw.
Problem is, my old B5 RS4 did 229wkw (stock), and thats suppose to have ~30hp less that the B7.

I assume this is the dreaded Carbon build up, as i dont seem to get any 5,500rpm kick in the pants.

I've read ALLOT of posts all over the web on this issue, and other than physical cleaning, i'v yet to see a fix, or preventative techniques.

Some unproven discussion have been:
> External catch can
> Run a meth/water setup

Many of these posts are old, and i'm wondering what the current understanding is to fix this issue is, prevent it, and whats recommended in general.

hit me with it please!

Sounds like you have a Vacuum leak. Check all associated vacuum hoses.

kiwi_mtm wrote:i dont seem to get any 5,500rpm kick in the pants.

This means the power flap isn't opening. Two probable causes:

1) problem with the vacuum lines

2) power flap physically sticking

Most likely is (as has already been said) the vacuum lines.

It wont be carbon build-up.

My car was down on power 2 years ago. It was found to be the flap in the air box seized, the pipe that feeds the flap in box was squashed (probably done in manufacture) and the slenoid for the air auxillary flap was corroded with water in.

I have to say I am not convinced that the airbox flap has that much of an effect though it must help.
I have driven cars with and without it working and there doesn't seem to be much of a relationship

06 saloon APS mapped car had a huge kick and a defective airbox flap
07 Avant on SW0030 converted to SW0090 lost its kick, in both cases with a defective flap
06 saloon, standard map ITG panel filter and new flap, car had a huge kick, same but with intermittent EPC light, flat as a fart

Doug said the timing changes at 5000rpm, there is definitely more to what happens above 5k than just the flap.
having had a quick look at the SSP in the downloads section,the inlet manifold length changes too.
I am sure fuel octane has an bigger effect which makes sense as it allows the timing to be advance further
I am running Tesco Momentum and my kick is strong, APS car had this fuel as well.

making sure plugs and air filter air fresh is a good idea too.

maybe someone with more knowledge that me can offer up some more info and piece all this together into facts rather than my rather unscientific speculation

I think the inference you get after reading thru the posts on this forum is that as you've written there's a 'kick in the pants' waiting for you @ 5500rpm. Am not sure whether you lost your kick ie. you had it before or you've never experienced anything at that rpm but in my experience it's much more subtle & you have to be searching for it. I'll add my car is stock

Agree Necks, its the Variable valve timing that is changing, I done away with my flap and it still kicks in at 5.5k.

a vacuum leak will <beep> timing

Here is the Dyno Graph. As far as i can tell its down to flywheel ~360hp peak.

http://i20.photobucket.com/albums/b239/ ... B7Dyno.jpg





Here is my old B5 RS4 (Stock) onthe same dyno.

http://i20.photobucket.com/albums/b239/ ... rwheel.jpg

Well, that equates to 286bHP which is not a lot for an RS4, also judging by the radical change in printout, although you have gone back to the same place, it would appear you were tested on different (possibly new) rollers !

Ice_Coffee wrote:Well, that equates to 286bHP which is not a lot for an RS4, also judging by the radical change in printout, although you have gone back to the same place, it would appear you were tested on different (possibly new) rollers !

Do note that that is Wheel KW.

It's not that bad actually. You don't have the kick, I can see that as your torque generally falls off and there is no peak in torque at 5500 rpm.

The temp is 22 Degrees, but your intake temp is probably in the 50's on the Dyno. I'd say the drop in torque is just due to more timing being pulled given the hotter intake temps.

Your power curve looks ok, I don't think you have anything to really worry about at the moment.

test was run in 4th
from 65-170 (~40 to 102 mph) you have > 600 Nm
that equates to 2500 to 6500 rpm
600 Nm ~ 440 lb ft?
what am I missing?

More info: Just did the 2x Flap tests, as per the B7 Forum Sticky.

The ~inlet / manifold flaps appeared to work, with the white plastic thingee looking to do a full movement.

HOWEVER, the Airbox one went 'ping, ping, but only moved the airbox flap ~2mm, and not a 90 degree OPEN/CLOSE.
Is the test supposed to do a full Open / Close of the Airbox flap ?? ie a full 90 degree movement ?

More Info: Managed to borrow a Vagcom, here is the faults logged

Note the miss fires, is this normal ??
PS. Was only serviced 1 month ago, when i purchased the car (they might have just cleared the logs, and ignored issues, call me untrusting!)

======================================

VCDS Version: Release 10.6.3
Data version: 20101206

Sunday,27,March,2011,16:20:14:32171

Chassis Type: 8E - Audi A4 B6/B7
Scan: 01 02 03 08 09 0F 11 15 16 17 18 36 37 45 46 55 56 57 65 67
69 75 76 77

VIN: WUAZZZ8E47N903026 Mileage: 35600km/22120miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 079-910-560-BNS1.lbl
Part No SW: 8E1 910 560 HW: 8E1 907 560
Component: 4.2L V8/4V FSI ª0090
Revision: 57H13--- Serial number: XXXXXXXXXXXXXX
Coding: 010C0003180F0160
Shop #: WSC 00010 824 83287
VCID: E3CFC0A65BD3

1 Fault Found:
006435 - Please Check DTC Memory of ECU Number 2
P1923 - 008 - Implausible Signal
Freeze Frame:
Fault Status: 01101000
Fault Priority: 0
Fault Frequency: 1
Mileage: 35602 km
Time Indication: 0

Freeze Frame:
RPM: 0 /min
Load: 0.0 %
Speed: 0.0 km/h
Temperature: 81.0°C
Temperature: 50.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 11.938 V

Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-910-517.lbl
Part No SW: 8E0 910 517 G HW: 8E0 614 517 BD
Component: ESP8 quattro H06 0150
Revision: 00000000 Serial number: 00000000000000
Coding: 0004533
Shop #: WSC 06335 000 00000
VCID: 2B5FE886F383

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 8E0-820-043.lbl
Part No: 8E0 820 043 BM
Component: A4 Klimaautomat 2833
Coding: 00000
Shop #: WSC 06335
VCID: 6DDB269E0D17

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 8E0-907-279-8EC.lbl
Part No: 8E0 907 279 N
Component: int. Lastmodul ECE 0907
Coding: 11121
Shop #: WSC 00010
VCID: 3D7BD6DE1DF7

No fault code found.

-------------------------------------------------------------------------------
Address 11: Engine II Labels: 079-910-560-BNS2.lbl
Part No SW: 8E1 910 560 HW: 8E1 907 560
Component: 4.2L V8/4V FSI ª0090
Revision: 57H13--- Serial number: XXXXXXXXXXXXXX
Coding: 010C0003180F0160
Shop #: WSC 00010 824 83287
VCID: E3CFC0A65BD3

4 Faults Found:
000768 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 - Upper Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 0
Fault Frequency: 1
Mileage: 35394 km
Time Indication: 0

Freeze Frame:
RPM: 817 /min
Load: 23.9 %
Speed: 2.0 km/h
Temperature: 92.0°C
Temperature: 36.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.589 V

000773 - Cylinder 5: Misfire Detected
P0305 - 001 - Upper Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 0
Fault Frequency: 1
Mileage: 35394 km
Time Indication: 0

Freeze Frame:
RPM: 817 /min
Load: 23.9 %
Speed: 2.0 km/h
Temperature: 92.0°C
Temperature: 36.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.589 V

000776 - Cylinder 8: Misfire Detected
P0308 - 001 - Upper Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 0
Fault Frequency: 1
Mileage: 35394 km
Time Indication: 0

Freeze Frame:
RPM: 817 /min
Load: 23.9 %
Speed: 2.0 km/h
Temperature: 92.0°C
Temperature: 36.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.589 V

000775 - Cylinder 7: Misfire Detected
P0307 - 001 - Upper Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 0
Fault Frequency: 1
Mileage: 35394 km
Time Indication: 0

Freeze Frame:
RPM: 817 /min
Load: 23.9 %
Speed: 2.0 km/h
Temperature: 92.0°C
Temperature: 36.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.589 V


-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8E0-959-655-94.lbl
Part No SW: 8E0 959 655 G HW: 8E0 959 655 G
Component: Airbag 9.41 H12 3730
Revision: 91H12373 Serial number: 0036M0G3EJ63
Coding: 0430712
Shop #: WSC 06335 000 00000
VCID: 3B7FD8C603E3

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 8E0-953-549-T.lbl
Part No: 8E0 953 549 T
Component: Lenksáulenmodul 0301
Coding: 16022
Shop #: WSC 06335
VCID: 448DA33A7E1D

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8E0-920-9xx-8EC.lbl
Part No SW: 8E0 920 931 G HW: 8E0 920 931 G
Component: KOMBI+WFS 4 H14 0040
Revision: 0040 Serial number: 00000000000000
Coding: 0023111
Shop #: WSC 00010 824 83250
VCID: 2C5DEB9AF68D

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: 8E0-959-760.lbl
Part No: 8E0 959 760 A
Component: Sitzverstellung H01 0020
Coding: 00001
Shop #: WSC 06335
VCID: 3261F5E2D4A9

No fault code found.

-------------------------------------------------------------------------------
Address 45: Inter. Monitor Labels: 8E0-951-177.lbl
Part No: 8E0 951 177
Component: Innenraumueberw. 0804
Coding: 00001
Shop #: WSC 00000
VCID: EBDFA886B303

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 8E0-959-433-MAX.lbl
Part No: 8E0 959 433 CH
Component: Komfortgerát T3B 4135
Coding: 07146
Shop #: WSC 00010
VCID: 79F302CE495F

Part No: 8E2959802E
Component: Tõrsteuer.FS BRM 0706

Part No: 8E2959801E
Component: Tõrsteuer.BF BRM 0706

Part No: 8E0959801E
Component: Tõrsteuer.HL BRM 0606

Part No: 8E0959802E
Component: Tõrsteuer.HR BRM 0606

2 Faults Found:
01370 - Alarm triggered by Interior Monitoring
35-00 - -
01559 - Drivers Door
60-10 - Won't Safe - Intermittent

-------------------------------------------------------------------------------
Address 55: Xenon Range Labels: 8P0-907-357.lbl
Part No: 8P0 907 357 F
Component: Dynamische LWR H02 0010
Revision: 00000001 Serial number:
Coding: 0000005
Shop #: WSC 06335 000 00000
VCID: 3D7BD6DE1DF7

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio Labels: 8E0-035-1xx-56.lbl
Part No: 8E0 035 195 AB
Component: symphony II PM6 0470
Coding: 01201
Shop #: WSC 00000
VCID: 67D754B62FEB

No fault code found.

-------------------------------------------------------------------------------
Address 65: Tire Pressure Labels: 8E0-907-273.lbl
Part No SW: 8E0 907 273 A HW: 8E0 907 273 A
Component: Reifendruck 3 H04 0130
Coding: 0022523
Shop #: WSC 02197 785 00200
VCID: 2A51ED82FC79

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist Labels: 8E0-919-283-8EC.lbl
Part No SW: 8E0 919 283 E HW: 8E0 919 283 E
Component: Parkhilfe 8-Kan H06 0010
Revision: 00H06000 Serial number: 00067802120625
Coding: 0000114
Shop #: WSC 06335 000 00000
VCID: 3261F5E2D4A9

No fault code found.

End ---------------------------------------------------------------------