My '14 Stock RS4 Runs 12.9@171kmh

['Qfizzle]

On 91 Octane pump gas.


13 Flat.

http://www.youtube.com/watch?v=8BvPlD8X ... e=youtu.be

12.9@171km/h
1.9 60ft

http://www.youtube.com/watch?v=VqV3jppp ... e=youtu.be

[sakimano]

Seems a bit slow. What was the location (I haven't seen the video so I apologize if it's in there)

I reckon a healthy stock B8 RS4 should be pushing around 12.4-12.5 @ 179-180 kmh. That would of course be assuming maybe better octane like 93-94 (UK/EUR 99) and density altitude around 0 feet.

[RIV]

He's probably got the weight of the open air sunroof slowing him down, and the weight of the auto closing rear tail gate motor, + a very slight head wind

[Graeme4130]

No launch control ?

[sakimano]

Sounded like he used it in first video graeme

Just saw it was in Bahrain. Probably not ideal weather for making power.

Sounded like it bogged on the launch. Try rolling out rather than using launch control.

[Graeme4130]

That's not launch Control in vid one, that's hit the throttle and let the clutch catch up
Not much in it in terms of speeds though

[GrahamS4]

At GTI International last year (Shakespeare County Raceway) the Milltek B8 RS4 was running 12.9-13.1 without the launch control. With it was down to 12.6.

For comparison on the same day, same strip my standard B8 S4 ran a 12.92s @ 107mph (172km/h).

[sakimano]

At GTI International last year (Shakespeare County Raceway) the Milltek B8 RS4 was running 12.9-13.1 without the launch control. With it was down to 12.6.

For comparison on the same day, same strip my standard B8 S4 ran a 12.92s @ 107mph (172km/h).

sounds like a warm weather event where your intercooling and boost bleed off helped you a bit vs the NA RS4.

[GrahamS4]

It was a hot day.

[GrahamS4]

At GTI International last year (Shakespeare County Raceway) the Milltek B8 RS4 was running 12.9-13.1 without the launch control. With it was down to 12.6.

For comparison on the same day, same strip my standard B8 S4 ran a 12.92s @ 107mph (172km/h).

sounds like a warm weather event where your intercooling and boost bleed off helped you a bit vs the NA RS4.

What benefit is the boost bleed off in this scenario please?

['Qfizzle]

It was a hot day and the fuel she was on is 91oct

Will be going back again but this time i will pour in VP103. Lets see how it goes.

[sakimano]

S

At GTI International last year (Shakespeare County Raceway) the Milltek B8 RS4 was running 12.9-13.1 without the launch control. With it was down to 12.6.

For comparison on the same day, same strip my standard B8 S4 ran a 12.92s @ 107mph (172km/h).

sounds like a warm weather event where your intercooling and boost bleed off helped you a bit vs the NA RS4.

What benefit is the boost bleed off in this scenario please?

As Audi designed it, the stock tune has a boost target and beyond it, a valve opens to bleed off boost. The pulley on your car is small enough that without that boost bleed off you could make another 60+hp. Instead they allow it to be balls to the wall up to 6000 rpm , then bleed off boost above it. So you end up with AMAZING area under the curve... That of a 420+hp/400+tq car... Up until that boost bleeding valve opens at around 6000 rpm.

Have a look at a log or dyno of a b8. It's like someone turned off the fun. Car flatlands from there. It's artificially limited. Peak hp is calculated at high rpms ...but if the car is held back up top, that number will be a little low. In reality stock the b8 on good pump fuel is making about 365 hp, not 333. But as I said up until the valve dumps boost, it's BEHAVING like a car on pace to hit 420 or so.

On other platforms with the 3.0t the tune steps in much earlier to limit peak hp. 300 on the a6 and q7. Etc. On others it steps in later.. Sq5 makes 360, porsche cayenne hybrid it made even more before the electric motor.

This allows audi to sell one engine, one pulley, one supercharger, at various hp levels.

When the air is less 02 dense as it is in frying pan hot bahrain or a sunny day at GTI INTL, with a fixed pulley and no options your car would be down bunch of hp. 3-9%. That applies to an NA car like a b7 or b8 RS4 as well.

But when your car has that upside capacity and only closes that valve once the boost target is hit, you can make up for the conditions as the car compensates.

Once you're tuned and maxing out the pulley and blower, you will hit say 420hp. If it's hot out and less dense air you will lose power vs perfect cool conditions because your car has no more 'reserve'. Like an na car.

Because now in stock form it is so limited, there's plenty of reserve to partially compensate.

[doodlebug]

Err SQ5 is diesel.

[sakimano]

Err SQ5 is diesel.

err not where I live. Or most of the world. Thanks anyway though!

Errr...

Sq5 3.0TFSI
It is a petrol version of SQ5 with 3.0 TFSI engine rated 354 PS (260 kW; 349 hp)@6000–6500 rpm and 470 N·m (346.65 lbf·ft)@4000–4500 rpm, eight-speed tiptronic transmission, quattro permanent all-wheel drive
The vehicle was designed for United States, Canada, Russia, China, Japan, Singapore, South Korea, South Africa, Mexico, Brazil, Argentina, Chile and the Ukraine markets.

[doodlebug]

Errr, you do like to deliver some attitude. Given that most on here are UK based reasonable comment, no?

Looks from that list all of Audi's big markets got the diesel.