Valves- carboning up

[ArthurPE]

I had my car opened up first at 19k miles. When the inlet manifold was taken off the car there was so much oil inside it litterally dripped over the floor. The car was perfectly 'heathly' and had absolutely no faults with everything working as Audi intended. Caldy's was filthy with only 5k...

Question, why did these 2 cars look so different, do you think ECU software updates plays a role the build up of carbon? like one car still running the original SW and one has the latest update, or if not, do you think it it will mitigate it.

THAT is a very good question...since after reading the patent software methods plays a pivotal role in the cleaning strategies

[sonny]

Im still running the original 2006 SW, and pulled 380.4 on the Rollers (APS Generic map only mod at the time). surly mine being an old car with 28k miles on the clock would or should show a lower performance out put. Just goes to show how sensitive these engines are.

[ArthurPE]

Im still running the original 2006 SW, and pulled 380.4 on the Rollers (APS Generic map only mod at the time). surly mine being an old car with 28k miles on the clock would or should show a lower performance out put. Just goes to show how sensitive these engines are.

first, using correction factors to determine crank HP is black magic

but I'm guessing wheel HP was 320-330 range or so, which is what I would expect...your car is fine, and probably has deposits similar to the ones posted (unless there was another fault in the engine)

do some 3rd gear, 3000-8000 rpm runs using the OBC
if ~8 sec, you are in good shape, actually better becuase a stock car runs ~8.4

[sonny]

Im still running the original 2006 SW, and pulled 380.4 on the Rollers (APS Generic map only mod at the time). surly mine being an old car with 28k miles on the clock would or should show a lower performance out put. Just goes to show how sensitive these engines are.

do some 3rd gear, 3000-8000 rpm runs using the OBC
if ~8 sec, you are in good shape, actually better becuase a stock car runs ~8.4

I will do this as soon as I get back to the UK.

Power was est flywheel figures, Surrey Rolling Road

[ArthurPE]

it's a good test, no shifting to influence time, plus it replicates a dyno pull

3000-8000 ~ 36 to 96 mph, so make sure it's safe and you have some room
start at 2500, squeeze throttle gradually so 100% ~ 3000, start timer, and hold on
it's accurate too, becuase there is no tach error, easy to see, and 3000/8000 are easily delineated
average 3 or 4 runs

[RS6chris!]

Gonna give this a go...watch this space.

[sonny]

it's a good test, no shifting to influence time, plus it replicates a dyno pull

3000-8000 ~ 36 to 96 mph, so make sure it's safe and you have some room
start at 2500, squeeze throttle gradually so 100% ~ 3000, start timer, and hold on
it's accurate too, becuase there is no tach error, easy to see, and 3000/8000 are easily delineated
average 3 or 4 runs

Souds very simler to when I was having my MRC remap done, again I will try this test in a few weeks.

[lengster1]

Anyone found a good product/method for doing the decoke?

[RS6chris!]

do some 3rd gear, 3000-8000 rpm runs using the OBC
if ~8 sec, you are in good shape, actually better becuase a stock car runs ~8.4[/quote]




Right..

Done this today as follows>>

1st run....8.2
2nd run.....8.4
3rd run....8.4
4th run....8.1....although i wasnt to good on the button!!

Car standard using the onboard lap timer for reference.

I know not the most scientific tests but there or thereabouts.

Arthur comments????

[ArthurPE]

Right..
Done this today as follows>>

1st run....8.2
2nd run.....8.4
3rd run....8.4
4th run....8.1....although i wasnt to good on the button!!

Car standard using the onboard lap timer for reference.

I know not the most scientific tests but there or thereabouts.

Arthur comments????

avg ~ <8.3, very good...stock is ~8.4, very similar to mine
magazines ran avg 8.0 using 1st, 2nd & 3rd gears! very close to your best of 8.1

pulls hard doesn't it? such a wiiiiiiiide power band

how many miles on yours?
what was the temp?
how much fuel?
only you in the car?
level road?

imo, your car is fine and making rated power

[RS6chris!]

23000 miles
3.5 degrees outside temp.
quarter of a tank of fuel.
only me in car.
Level road.
Running Shell V max fuel. 99 octane.

Feels as quick as ever!!!!

[ArthurPE]

23000 miles
3.5 degrees outside temp.
quarter of a tank of fuel.
only me in car.
Level road.
Running Shell V max fuel. 99 octane.

Feels as quick as ever!!!!

so it seems whatever carbon has accumulated of your valves in 23000 miles (I assume they have never been cleaned) appears to have no impact on performance...

let me reiterate, your best run, 8.1, the car was warm and you got the hang of it, is ~the same (better than some, but ~the same as the avg of 8.0) for a car on a full out run using all gears...
1st is good for 40, and 2nd 66, you started at ~36
so the range you covered in 3rd, they would have been in second for the begining, and 2nd for the mid range...
you would have been faster starting in 2nd and shifting in 3rd, so you would have been faster than the tests...

cold air helps, but not that much

[RS6chris!]

Car feels strong as ever

800miles till next service which will be its third one

Car defo feels stronger on higher octane fuel.


The only thing thats bugs me are them pictures of choked up valves which are etched into my brain!!!!!

[sonny]

The only thing thats bugs me are them pictures of choked up valves which are etched into my brain!!!!!

You and the rest of us fella.

[P_G]

Just did this 3k-8k rpm test on my car in third gear today, 59,500 miles on the clock, results were;

1st lap 8.4
2nd lap 8.2
3rd lap 8.4
4th lap 8.2

Done at 1 degrees celcuis external temperature, RS4 Avant, 3/4 tank of fuel on board, oil temp average 89 degrees celcius, slight incline on road but straight. Car is OEM except BMC filter and x-pipe but no remap.