The Audi RS 4 B7 Audi ventured into the segment of high-speed motors, 420 bhp, the V8-sucker in sedan, wagon and convertible. Problem: With increasing age, many suffer RS 4 to inefficiency. We say what you need to consider when buying used.
Eight instead of six! In the mid-2000s, the premium manufacturers upgraded their sport sedans and coupés. BMW built a 4.0-liter V8 in the 3 Series, Mercedes relied on a 6.2L Torque Hammer in the C-Class.
Audi also constructed a new engine with 4.2 liter displacement for the A4 - of course with eight cylinders, arranged in a V-shape, designed breathing freely and long stroke, without turbo or compressor, 420 horsepower. Coupled to a six-speed manual transmission. Automatic? did not give it. A feast for purists.
As with Mercedes-AMG and BMW unlike the RS was 4 (B7) also available as a station wagon. The dream of every practically assessed people who travel in a sporty like. In addition, this RS was still available as a sedan and convertible in the Audi catalog. All subsequent RS 4 gave it only as an Avant. From B7 approximately 14,350 vehicles were built between 2005 by 2009. The number varies according to source plus / minus 100 pieces. The original price was about 71,000 Euros at launch.
Used car market: price range from 25,000 to 50,000 euros
Meanwhile one can a used RS 4 (B7) afford as average income. But used cars that are at least eight and a half years old, there are a few minor hiccups 4 B7 and a couple of major problems in the Audi RS.
Let's look first at the market situation. On the relevant used car portals like mobile.de or here about 90 specimens found with mileage up to 200,000 kilometers or more. Let's focus on those with 125,000 kilometers or less remain only 30 Audi RS 4 B7 left. The prices range from 25000 to 50000 euros, depending on age, body style (sedan, wagon or convertible), condition and mileage.
There are also copies with more than 200,000 kilometers for less than 20,000 euros. However, that's a lot for this, quite stable V8 engine. And, as always, when traders it buys more expensive but safer principle - due to statutory liability.
Audi RS 4 (B7): Strong performance in the Super Test
Super test of the RS 4 convinced: "4,7 seconds to 100 km / h are a 1728 kg heavy sedan to shame, as the acceleration value to 200 km / h. 16.9 seconds," it says. Problem: Back then, we have not yet measured the performance test vehicles to the test. Compared with a BMW E92 M3, the Audi RS 4 was exactly 1.2 seconds slower to 200 km / h.
On the north loop of the RS 4 achieved a lap time of 8:09 minutes. "Except for a slightly unruly behavior in heavy braking from extremely high pace of the RS4 also disclosed in the border area of the Nordschleife no disturbing characteristics," wrote our Supertester. Other image at Hockenheim: "spontaneous and agile turning in the following under constant load initially clear understeer - at least in the slow corners."
However, the best discipline of the RS 4 was the then tested wet handling ". The advantages of all-wheel drive are especially at low μ values, so when wet and still manage slippery conditions on hand" The RS 4 at that time reached the absolute best time on the irrigated handling course.
Direct injection results in carbon deposits in the engine compartment
"Basically, the Audi RS 4 is a very nice car with a great sound," says Thomas Damm, RS 4 expert at dam-vehicle technology, a company from Langenselbold in Hesse, which specifically deals with Audi RS models. "Unfortunately, the engine is the problem child," he adds. First, the engines consume occasionally oil (more than 1 liter / 1,000 km). This is consistent with many reports from RS 4 forums such as here.
And then there's the performance problem: Even when shipped the RS 4 have rarely achieved the promised 420 hp. "Most of the power was at 380 to 400 hp," says Dam. but any other defect can be detected even without scrutiny: the carbon deposits on the intake valves. "Thus, the power can be further reduced by up to 40 hp," says Thomas Damm. The reason for this lies in the coking then little new direct injection.
Because the fuel no longer flows (cleaning effect) through the suction pipe, but is directly injected into the combustion chamber, forms in front of the inlet valve a kind of crust of unburnt fuel and oil.
"The result is that the pressure difference and thus the losses in the intake rise and the engine is not sufficiently filled. Consequence: less power and less torque RS Clinic "from Hannover," writes "to this problem. The solution: a mechanical cleaning of the intake tract. "Dry cleaning brings something with low pollution," reads part of RS Clinic. Costs?
"We demand for our cleaning about 950 euros," says Thomas Damm. This cleaning brings with prior heavy dirt back much of the lost power. In subsequent measurements are on average 30 hp, returning after cleaning. Is it possible to prevent coking too? Difficult, says the RS-clinic. Possibly it might be useful to resort to a thick oil more fluid (eg 15W50) to reduce the amount of oil in the intake.
If the engine rattles and First Launch day klackert (two to three seconds), the timing chain and the chain tensioner must be replaced. "For the engine out of the car need to get out and transmission are disconnected." Cost point for this service: 2,000 to 3,000 euros, according to Damm-vehicle technology.
Dynamic Ride Control suspension with leaking shock absorbers
Another weak point of the Audi RS 4 (B7) is the chassis, which is, according to the RS-clinic "very vulnerable". This is especially true for the shock absorbers of the adaptive Dynamic Ride Control suspension that leak over time.
Per se only a little problem, the DRC would not be a closed hydraulically operating system as a whole, usually prevails in the oil pressure of "about 15 to 16 bar." A damper now leaking, the pressure decreases in the entire system - the result: more dampers are damaged or wear out faster.
"The exchange and the filling of a shock absorber is only possible for Audi," explains dam. Thus, it is extremely expensive fast: A shock absorber will cost around 450 euros. The expert recommends rather like the installation of a complete chassis, for example from KW or Bilstein. That was both price and technically attractive than the elderly DRC for the customer.
Ceramic brake with torn bolt
If the car with the optional ceramic brakes (very rare!) Was equipped, there could be problems here, but these are not visible at first glance. "Here one should consider very carefully," says Dam. the bolts of the front brake disks may be torn - connect the pot of the brake with the friction ring.
As a result, are often miteingerissen the slices. An exchange is expensive - and no longer possible at Audi itself, since no spare parts are produced more for this brake system. Spare's at most specialists. Damm: "Including coverings will cost us a brake rotor 2,700 euros."
The selection of used Audi RS 4 in acceptable condition in the market is very low - and it will not grow. Especially popular the RS 4 is still an Avant, these models achieve the highest prices. The combination of this practical body style, naturally aspirated V8 engine, traction strong four-wheel drive and manual transmission we find new nowadays hardly. Reason enough for fans who now watch a RS 4 - ideally with purified motor and to exchange, timing chain.