Pics of my carbon build up!

[neckarsulm]

IIRC, I was taking 9.0-9.5 secs for the 3k-8k run. Am now taking 7.9 secs.

What measuring device were you using Steve?

[DuncS3]

if correct, that 3-8k was slow (obviously there are a lot of assumptions there)

I did some tonight actually with the lap timer and my brain as it was nice and cold and got 7.9 and 8.0 - the highest I have seen is 8.5, usually around 8 and a smidgen but this is not a totally scientific method (reaction times and accuracy etc)

sorry editted to say I just realized you have an avant, so of course it would be slow

(JOKE!)

[neckarsulm]

if correct, that 3-8k was slow (obviously there are a lot of assumptions there)

I did some tonight actually with the lap timer and my brain as it was nice and cold and got 7.9 and 8.0 - the highest I have seen is 8.5, usually around 8 and a smidgen but this is not a totally scientific method (reaction times and accuracy etc)

my lap timer times were waaaaaaaay quicker than VAG COM
IMHO VAG COM times are the only ones worth looking at, switching lap time on and off accurately at full throttle isn't going to happen, hard enough to do 3k-8k safely on public roads with VAG COM doing the timing

[DuncS3]

agree - it gives a little indication but hard to be scientifically correct, too may variables with reaction time being a big one

[ArthurPE]

without allowing this to devolve into a pissing fest, I'll share this and bow out
my car runs 8-8.5, 45k miles, bone stock, depending on temp and fuel load
throttle application method has a lot to do with times also

I have data for well over 200 runs, and over 60 cars, maybe more that I haven't had the chance to add yet
I'm getting stuff from all over the world
I adjust for temp, fuel, passenger, etc. and alt if I can get it/estimate it

avg of all unmodded cars >40k miles ~8.5 sec +/- 0.1
all cleaned unmodded cars, the same, within the confidence interval

the worst time...9.1 (avg of 3-4 runs was 8.9)...in >100F temps(!), when adjusted, 8.5

a car (sedan) with deposits easily 5 times worse than yours, maybe more
heads were removed by Audi: new gaskets, plugs, etc. pistons/chambers/valves cleaned
ran befores and afters, same road, against the same uncleaned high mileage car (an avant, heavier)
no difference...this would indicate that the deposits have little impact on power, but may manifest theirself in other ways...imho deposits that cause power loss are the result of the failure of another system...a symptom, not the root cause...and is not very common

I have several other neck to neck run examples of before/after vs uncleaned cars...no net change

these are my opinions, and I have no doubt everyone is smart enough to form their own,...I'm not that bright so take it with a large grain of salt...

[neckarsulm]

sorry editted to say I just realized you have an avant, so of course it would be slow

(JOKE!)

but still quicker than your "legendary" ur

[ArthurPE]

as far the lap timer, over many samples, and the fact that errors cancel (start late, stop late) it's accurate enough to determine if there is a 50 to 100 HP loss

[DuncS3]

Ford Mondeo is quicker than that nowadays (probably)

[neckarsulm]

as far the lap timer, over many samples, and the fact that errors cancel (start late, stop late) it's accurate enough to determine if there is a 50 to 100 HP loss

so are you saying its a worthy measuring device or being ironic?

[ArthurPE]

as far the lap timer, over many samples, and the fact that errors cancel (start late, stop late) it's accurate enough to determine if there is a 50 to 100 HP loss

so are you saying its a worthy measuring device or being ironic?

I'm saying any one run may be suspect...
but after a guy plays with it, and gets the hang of it, becomes a useful tool
more so the more runs he does
having a sample of 200 runs only makes it more valid
but temp/fuel/etc. must be factored in

I'm dense/stubborn, but not ironic
ask my wife

[neckarsulm]

having a sample of 200 runs only makes it more valid

when someone does 200 runs, I'll agree

[ArthurPE]

having a sample of 200 runs only makes it more valid

when someone does 200 runs, I'll agree

imo
25 sets of 5 from unleaned cars
and
15 sets of 5 from cleaned cars
with some over lap

is a better sample than 200 from the same car

[neckarsulm]

OT but did you get my PDF Art?

[ArthurPE]

OT but did you get my PDF Art?

I'm not allowed to say YES

I still want to talk to you about my cleaning idea, but it's been hellish at work lately

[neckarsulm]

I still want to talk to you about my cleaning idea, but it's been hellish at work lately

...completely forgot about that suggestion you made as it was received very late