Lost the kick at 5000 rpm

[aidanjaye]

the inlet manifold fault may or may not have a code...

do some 3k to 8k 3rd gear runs
start at 2000, slowly squeeze throttle until 100% at 2600 or so
start at it approaches 3000, stop at it passes 8000...you will hit the rev limiter right after
use the OBC timer
if your flaps are messed up (a vacuum leak) you will be waaaay down on power, as evidenced by numerous dyno plots where that was the problem...

Just be carefull. As others have found, ArthurPE's "testing" runs can get addictive (but fun).

[ArthurPE]

the inlet manifold fault may or may not have a code...

do some 3k to 8k 3rd gear runs
start at 2000, slowly squeeze throttle until 100% at 2600 or so
start at it approaches 3000, stop at it passes 8000...you will hit the rev limiter right after
use the OBC timer
if your flaps are messed up (a vacuum leak) you will be waaaay down on power, as evidenced by numerous dyno plots where that was the problem...

Just be carefull. As others have found, ArthurPE's "testing" runs can get addictive (but fun).

lol, good advice, you will be approaching 100 mph
disclaimer: try at your own risk

[neckarsulm]

So chaps, what's a good time for the 3000-8000 rpm?
Did two runs and both were consistent.
I have owned 2 x B5 RS4s (stock and mapped) and a 1 X B7 S4 and drive a 170 PS A4 TDI day-to-day and my seat of pants feeling is that it's pretty healthy but we shall see!

[P_G]

In current temp conditions my Avant will do somewhere between 8.4 and 8.8 seconds with 1/2 tank of fuel, me and kids seats on board.

[neckarsulm]

In current temp conditions my Avant will do somewhere between 8.4 and 8.8 seconds with 1/2 tank of fuel, me and kids seats on board.

..is the right answer!
Just me on board, 1/3 tank of fuel which is about 60/40 99 ron/95 ron - 8.6 seconds

I appreciate the "be careful" warnings, doing 100mph and concentrating on the rev counter is interesting, thank god for private roads

[ArthurPE]

In current temp conditions my Avant will do somewhere between 8.4 and 8.8 seconds with 1/2 tank of fuel, me and kids seats on board.

..is the right answer!
Just me on board, 1/3 tank of fuel which is about 60/40 99 ron/95 ron - 8.6 seconds

I appreciate the "be careful" warnings, doing 100mph and concentrating on the rev counter is interesting, thank god for private roads

a stock saloon does ~8.4 to 8.5 (temp & load adjusted)
yours is right where it should be...
what was the temperature...
once you get 100% 99 RON you should see a few more ponies...

[neckarsulm]

a stock saloon does ~8.4 to 8.5 (temp & load adjusted)
yours is right where it should be...
what was the temperature...
once you get 100% 99 RON you should see a few more ponies...

Ambient was around 22-24 degrees C and I was in Sport mode (which I read in another post costs bhp???)

I still don't notice a particularly strong kick at 5500 rpm but it doesn't feel slow and to top it all off after a hard fast drive today with many high rpm sessions the original DTCs have not returned (and 2 weeks in I am now hugely enamoured with the dynamics but I'll save that for another post)

[ArthurPE]

temp would have little effect, close to 70F...

contrary to popular belief, the rate of accel will decrease above 5000, not increase...look at the HP & torque curve, the HP slope (rate of rise) decreases, and the torque magnitude actually decreases...

you can see this in any accel graph for the car...

it sounds like yours isrunning per spec, which is good

Ambient was around 22-24 degrees C and I was in Sport mode (which I read in another post costs bhp???)

I still don't notice a particularly strong kick at 5500 rpm but it doesn't feel slow and to top it all off after a hard fast drive today with many high rpm sessions the original DTCs have not returned (and 2 weeks in I am now hugely enamoured with the dynamics but I'll save that for another post)

[neckarsulm]

thanks for your advice Arthur.
One last question, how much horsepower (or PS) would you say "per spec" relates to or is that a contentious question having just read the RR thread

[ArthurPE]

thanks for your advice Arthur.
One last question, how much horsepower (or PS) would you say "per spec" relates to or is that a contentious question having just read the RR thread

who knows?
Audi says ~420

from a magazine article I read today...
for reference & consideration...

2 American muscle cars, built for dragging
2010 Camaro SS/426 HP/420 lb ft/test wt 4035/13 sec/110.7
2010 Mustang GT/412/390/3830/13.2/109.3
both did 0-60 in 4.6, similar to an RS4 so awd is not a huge advantage
63F/350' ASL

RS4, exact same magazine, driver, test procedure
test 1 4110 lb/12.8/109.7
65F
test 2 4180/13/108.1
78F
same 350' ASL

seems 'enough' to me...
RS4 avg 12.9/109
muscle cars 13.1/110
they are 100 to 300 lbs lighter...avg ~250
same HP and much more torque, which is what counts...
yet the RS is a bit 'quicker', 0.2 sec, and the muscle cars 1 mph 'faster'

this is what counts to me, real world performance...
I have a luxury saloon as fast as a muscle car, handles better, has 4 doors, and gets better mpg...

[P_G]

I still don't notice a particularly strong kick at 5500 rpm but it doesn't feel slow

I also don't feel the kick as much at high outside temps in 3rd, in 2nd you do. Below 20 degrees C the 'kick' is more pronounced.

[neckarsulm]

True Arthur, it's definitely enough and as you say the package is phenomenal, I was never able to get this level of driver satisfaction from either of my B5s which were more like dragsters with ample horsepower but little finesse.

I also don't feel the kick as much at high outside temps in 3rd, in 2nd you do. Below 20 degrees C the 'kick' is more pronounced.

..interesting as I haven't been to the red line in 2nd yet that I can recall, it's mainly 3rd. Roll on winter

[Doug_S2]

log timing and maf to see if there is a problem with vacuum lines/flaps.

Or do a fats test from 5k upto 8k as you are out of the torque range - bad cars have okish torque.

[2manytoys]

Yep, excessive timing <beep> and you'll have little to no kick. You should see this with outside air temps of 20+ degrees if you have a problem.

Interestingly my 3k-8k runs are within the 8 seconds (I think mine was actually 8.25 secs) yet my car was pulling 12 degrees timing. Get yourself VAGCOM if you are concerned, seriously, this is the best tool to find the problems.

See attached my run (using VAGCOM)

[ArthurPE]

8.25 sec is very good, yours is a vert correct?
they are a good bit heavier...

actaul spec saloon is ~8.5 sec in 3rd
the 8 sec is flat out using ALL gears...

imo you have to be careful when talking timing numbers with these cars, the internal egr kind of makes things more complicated...
the 12 deg pull may have been (obviously was for 8.25 sec in a vert) the optimum operating point...

yours only pulled that on 1 cylinder also (1 at 10, 2 at ~5), so it may have been running a bit hotter, less fuel, etc., due to location/whatever...

it also didn't pull til ~7900 rpm, which may be the 'soft limiter' and is past the power peak/optimum shift point anyways...

Yep, excessive timing <beep> and you'll have little to no kick. You should see this with outside air temps of 20+ degrees if you have a problem.

Interestingly my 3k-8k runs are within the 8 seconds (I think mine was actually 8.25 secs) yet my car was pulling 12 degrees timing. Get yourself VAGCOM if you are concerned, seriously, this is the best tool to find the problems.

See attached my run (using VAGCOM)