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S4 Tuning / S4 Buying Guide

Time:2018-01-12 08:30Turbochargers information Click:

Engin Performance tuning S4

S4 Tuning / S4 Buying Guide

This tuning guide is based on the B5 S4 with the 2.7litre twin turbo motor. These cars can be now picked up for between 3 to approx 8000GBP, which, given the fact that its engine is based on the humongously more expensive RS4, makes the S4 a bit


of a bargain. The S4’s 2.7litre turbo can be tuned to over 500bhp on standard engine internals making it possibly one of the cheapest 500bhp cars you can buy. Here’s how to get an S4 to the magic 500bhp mark


S4 Tuning / S4 Buying Guide

S4 Tuning – Brakes

The standard S4 brakes could be better. They fade after just one big stop. This can be largely sorted with the use of some high quality performance brake pads. If this still isn’t enough for you the next step is to increase the diameter of the brake discs. There are a number of ways of doing this and all methods require upgrading the wheels from 17s to 18s. HiSpec make a kit for 1500quid and this should be up to the most extreme track use. There is also an option of fitting the B7 RS4 brakes which use 8pot Brembo calipers. Speak to MRC for more details.

For the rear brakes a easy option is to get S8 caliper brackets which gives the ability to fit S8 discs. Calipers are extremely long lasting with the only really problem coming from the ABS electronics. The ABS circuit board can be reconditioned for a few hundred quid but if you want to replace the complete module this will set you back about a grand.

Audi S4s for sale on EBay

S4 Tuning / S4 Buying Guide

Audi S4s for sale on EBay USA

S4 Tuning / S4 Buying Guide

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S4 Tuning / S4 Buying Guide

S4 Tuning – Suspension

S4s with over 60-70 thousand miles ask if the front suspension arms have been replaced. There are 8 in total, 4 each side and when the ball joints wear out you have to buy a complete arm. The full set will cost around 600GBP. Any rattling over bumps is most likely the anti roll bar links which are much cheaper. Springs and dampers can last for a 150000miles.

One of the most cost effective improvements that can be made is H&R anti roll bars. The ride comfort stays the same but the car corners flatter and they give the S4 a more neutral balance.

For track days a coil over kit is the way to go, Bilstein and H&R both make a kit for the S4.

MRC Tuning S4, my word this flies

Just to put it into perspective, this S4, according to the video does 100-120 in just over 3 seconds, the new Mazda RX-8 R3 with 228bhp does it in 10seconds, the Lambo LP560-4 and Porsche 997 GT2 do 100-120 in 3 seconds. For the Lambo you’ll need 147,000GBP, for the GT2 131,000GBP, for the S4 you don’t. Rapid doesn’t really cover it. If you cant wait for the link at the bottom which takes you to S4s for sale in the UK. Its here  S4s for sale on Autotrader

S4s for sale on PistonHeads

S4 Tuning – Bodywork

The shell is galvanised so there shouldn’t be any rust. If there is rust it most likely be under the handle trim on the boot. If there is rust then suspect an accident repair, likewise if the doors don’t shut cleanly.

Audi S4 B5 Parts




S4 Tuning – Engine

The 2.7l V6 Twin Turbo motor comes with 265bhp as standard. To get over 300bhp a simple remap to up the boost from 0.5-0.7 to 0.9-1.2bar, MRC can do this for you for 400GBP. Combine the remap with a performance exhaust system and larger, second-hand RS4 intercoolers and the motor will be making around 330bhp. The pre cats can be removed and the car will still pass the MOT. Milltek, Supersprint and Scorpion make exhausts for the S4.

340bhp is about the limit of the standard K03 blowers. The next step up the turbo ladder is the K04 turbo. They are nearly the same price as the K03 turbos so its a no brainer upgrade. The K04 can supply enough air for 370bhp with a remap and the standard injectors and fuel pump. Uprated the fuel pump to a Bosch motorsport item and the injectors to 440cc capacity squirters and your looking at 450bhp with a suitable remap.

For the magic 500bhp 600cc injectors are required, hybrid K04s, tubular or ported original manifolds, thicker head gasket and a 3inch bore exhaust. The RS4 has uprated internals over the S4 but it is believed the S4 internals are hugely over engineered anyway, the RS4 internals are overkill.

Although the engine is girder strong, the bits that are hanging off it are not. The biggest thing to look at  on the FULL service history is the service intervals. Fleet cars had a variable service period which could be as long as 20.000 miles which is no good for the S4.  Have a butchers through the filler cap and you can just about see the cam lobes, check them for wear and listen for rattles. Sorting them out is 3 and half large.

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