something cool from Saki

[ArthurPE]

http://www.youtube.com/watch?v=BoV0lB3g ... r_embedded

0-60 3500 rpm launch 4.4 sec (afaik uncleaned car(?), so much for the HP loss theory)...good run
a bit of wheel spin, I bet at at 3000 it would have none, 0-60' would improve a bit, but probably little improvement in the 0-60 mph

[P_G]

I'm sure he has had his car cleaned now Arthur, that can of worms is well and truly open!

[ArthurPE]

I'm sure he has had his car cleaned now Arthur, that can of worms is well and truly open!

either way, same time as uncleaned...
I thought he said he was going to have it cleaned...he only recently bought it?
moot, seen similar times from cars with high mileage and never cleaned...
still a good run...4.4 sec for a 4000 lb car...not too shabby

[Brooner]

Sounds like he needs to put some copper coat on the exhaust valves a bit squeeky when the open and close
nice time though

[Timster]

Think we had this one posted up a couple of weeks ago, Arthur !

[wrekka]

Sounds like he needs to put some copper coat on the exhaust valves a bit squeeky when the open and close
nice time though

Was thinking just the same! lol Still sounds well as stock, i'm used to a milltek but still oem sounds good!

[sonny]

"Sports mode engaged" thought he was going to take off into the Stratosphere.

Thats actually a great example of how you can hear the exhaust actuators clicking when applying throttle.

[ArthurPE]

"Sports mode engaged" thought he was going to take off into the Stratosphere.

Thats actually a great example of how you can hear the exhaust actuators clicking when applying throttle.

she can't take any more Captain! it's the dilithium crystals!

[sakimano]

hey arthur, I tried launching a few different ways today at the dragstrip.

best was 3000 even. Little bit of wheelspin and a good bit of acceleration. Produced a 12.9 @ 107.5 time. Still feels like I could be faster, as my best 60 foot time was 1.95. Anything below 3000 however bogged pretty badly. I imagine I could get that to 12.8something but since the car is stock, I'm not going to bother too much. Just wanted to set a tough benchmark against which to measure my modifications, including a JHM tune and piggie downpipes. Undecided on catback exhaust...I think stock sounds just fine, but it's certainly a restriction. I don't mind it being a little bit of a restriction, and I like the sound and the ability to keep it quiet.

My car is 30,000 miles old, but I don't know if it was ever cleaned. I'd love to ask the previous owner, but I don't get the misfires when it's cold etc that most people complain of. Considering it's about 0 celsius here in the morning right now (32 fah) you'd think I'd start to notice a lumpy idle or a misfire or two. I'm going to have it carbon cleaned in a few months, then have the JHM carbonator put on if they're ready for it.

Debate carbon all we want...I ran 12.9 @ 107 but it was in pretty awesome power making conditions (Density Altitude was around -300 or so). My track is famously quick thanks to being near sea level, and being in cold Canada for spring/fall racing. I will say this though...even if carbon has zero impact on performance as some people think, that's irrelevant: I don't want it in my engine for a number of reasons, including lumpy idle, cold misfires and most importantly the possiblity of a chunk making it's way into the cylinder and scoring a cylinder wall.

[ArthurPE]

hey arthur, I tried launching a few different ways today at the dragstrip.

best was 3000 even. Little bit of wheelspin and a good bit of acceleration. Produced a 12.9 @ 107.5 time. Still feels like I could be faster, as my best 60 foot time was 1.95. Anything below 3000 however bogged pretty badly. I imagine I could get that to 12.8something but since the car is stock, I'm not going to bother too much. Just wanted to set a tough benchmark against which to measure my modifications, including a JHM tune and piggie downpipes. Undecided on catback exhaust...I think stock sounds just fine, but it's certainly a restriction. I don't mind it being a little bit of a restriction, and I like the sound and the ability to keep it quiet.

My car is 30,000 miles old, but I don't know if it was ever cleaned. I'd love to ask the previous owner, but I don't get the misfires when it's cold etc that most people complain of. Considering it's about 0 celsius here in the morning right now (32 fah) you'd think I'd start to notice a lumpy idle or a misfire or two. I'm going to have it carbon cleaned in a few months, then have the JHM carbonator put on if they're ready for it.

Debate carbon all we want...I ran 12.9 @ 107 but it was in pretty awesome power making conditions (Density Altitude was around -300 or so). My track is famously quick thanks to being near sea level, and being in cold Canada for spring/fall racing. I will say this though...even if carbon has zero impact on performance as some people think, that's irrelevant: I don't want it in my engine for a number of reasons, including lumpy idle, cold misfires and most importantly the possiblity of a chunk making it's way into the cylinder and scoring a cylinder wall.

all very good times...sounds like 3000 is the sweet spot...2500 too low....3000 is pretty easy on the clutch too...people dropping it a>4000 some 5000 are asking for trouble
imo the rough cold starts are not deposit related but fuel condensing on cold cylinder walls and mis-firing, too lean
anyways at cranking/idle speeds the airflow is so low and throttle is closed (I think, some cars pop it open) that any restriction would have little impact, ie, no pressure drop, no reduction in air volume...

and 0-60 below 2 sec is good in my book since the veyron does 1.75 or so...12.9/108 is a good time now matter how you slice it, most mag results are adjusted for temp/alt/etc.
so your time on a 30k car (most likely uncleaned) is almost as good as any (I've seen a 12.8 from 1)
says a lot about your drag skills, must be pretty dang good

we have a gem of a machine...just cleaned mine up, and she looks good...the engine is a jewel, Ferrari grade for beer money
get my new DRC w/H&R and the clutch hang-up resolved it'll be spring love all over again

[Keith@APR]

The best launches will come after a clutch upgrade, even good for an otherwise stock RS4.

The OEM clutch will slip above a 4k rpm dump, maybe even above 3500.

The best 60' and 0-60 times from my testing, both stock with upgraded clutch and blown with upgraded clutch, came above 4500.

I got my best 60' and subsequently ET at a well prepared (sticky) drag strip by spinning all 4 wheels. I was sure I blew the pass when this happened but the timeslip proved otherwise.

http://www.youtube.com/watch?feature=pl ... Rp54w#t=4s

The quattro system still allows the fronts to slip 5-6 rotations until the rears are engaged and they will spin 2-3 rotations and then they all hook and off you go.

The best launch will not see a drop in rpm's after you come out of the hole. You want to launch at 4500'ish and when the tires stop spinning you want to start the rest of first gear acceleration above 4500.

If the rpm's drop after all four tires grab, that's called bogging the launch and you won't get the best 0-60mph, 60' or any timed run that starts from a stand still.

DO NOT TRY THIS WITH THE OEM CLUTCH. Unfortunately, timed runs from a standstill require one to abuse the car in a manner most aren't comfortable doing.

[gareth_oau]

I find the JHM short-shifter is a lot swifter through the gears than OEM.

Has anyone acually measured what sort of time benefits are had by the short-shifter?

[S4Player]

I launch around 4k anything higher and I fishtail

[Keith@APR]

I launch around 4k anything higher and I fishtail

Hey Danny, just keep the wheel straight and that will stop.

[S4Player]

The wheel was straight when I ran 11.77 on the strip but I my rear end went wild on that launch think I dumped at 5k. I found 4k just about perfect and worked for me everytime horses for courses and all that