S5 tuning

KBB

Registered User
Anyone has done any tuning at all? I'm not really familiar with the topic, but I've read it somewhere that 400+ hp can be reached with tuning boxes and thats a hefty power boost + extra torque. It would render the RS5 pointless basically.
Anyone has any info on this topic, or done it already maybe? Is it worth it, how much is it, how safe is it, what is the real world benefit?
 

Lawrence7

Registered User
DTUK seem to have a good following right through all of the VAG range. May be worth speaking to them...their online chat is quick and handy. I've toyed with it since my S3 but never had the guts on a PCP car.
 

Dippy

Registered User
As far as I am aware, no tuner has yet announced that they have "hacked" into the Bosch ECU used in the B9 S5, so tuning boxes are the only option. In addition to the affordable DTUK "piggy-back" box which "fools" the ECU, there is the rather expensive ABT solution which is more an "ECU override" box which replaces some ECU functions.
 

KBB

Registered User
As far as I am aware, no tuner has yet announced that they have "hacked" into the Bosch ECU used in the B9 S5, so tuning boxes are the only option. In addition to the affordable DTUK "piggy-back" box which "fools" the ECU, there is the rather expensive ABT solution which is more an "ECU override" box which replaces some ECU functions.

I see, thanks for that! I've seen the ABT somewhere before, but could not find price for it. Do you know how much are they doing that?
 

Zedi

Registered User
Wow, thats a lot. Anybody know if its worth it tho? Or the DTUK would just do the same job?
I don't see how it can be. The dtuk box is 550 with discount. I don't know if the abt maintains manufacturer warranty but even still I could put £2000 aside to fix anything that breaks if I go for the dtuk box.
 

Zedi

Registered User
I'm sure someone more knowledgeable will jump in but as far as I'm aware any kind of modification will invalidate warranty if they believe it is the cause of the fault.
 

RichardMMM

Registered User
So using a DTUK box would invalidate Audi's warranty on the car/engine?

Yes, it would of course invalidate the drivetrain warranty but the point of these boxes is that they can be easily removed before the car goes to a dealer, the idea being they would never know. Some people say the increased values would be stored in the ECU could be read but it's pretty much unheard of.
 

Dippy

Registered User
@KBB - A DTUK box will basically interpose itself between your sensors in order to provide a false reading to the ECU. I don't know exactly how the system links into the B9 S5 system, but it is likely to be a couple of the air intake pressure sensors and the engine speed sensor. It reads the pressure, and then likely from a look-up table referenced by the speed sensor, it decides what signal to send to the ECU as "fake" pressure. In general it outputs a lower pressure than actually measured. This means that when the ECU is reading the boost level that is pre-programmed as maximum allowed (so that it can divert boost to keep it as maximum), it is actually already higher because the DTUK box is "fooling" it. Based on what I have seen, unlike the boxes for diesel cars, the DTUK box does not tap into the fuel system for petrol cars. Instead it relies on the ECU using its exhaust gas sensors (lambda) to detect that the engine is now running lean and increase fuelling to compensate. Whilst this works, it is not an "ideal" control system as you would get with an ECU remap. I believe (but don't know for sure) that the ABT system uses the same principle but with a lot more inputs and outputs, so that it has more complete control over increasing performance. It's more like having a whole second ECU which is why it cost so much.

Expanding on what @RichardMMM wrote - in theory, and in practice so far, it has been possible to remove these systems (and removing the DTUK box looks really easy), reconnect the plugs and sockets, and the car is instantly back to stock. Take it to a dealer and they are completely unaware that the car has been previously tuned. Hence they would have no basis to refuse warranty, even if the ECU has logged error codes relating to the use of the box (I don't know if this happens but I expect it might). However Audi is fully aware of the existence of these boxes, after all Audi has been using their own "tuning box" in production to fake diesel emission measurements! And so Audi has for years wanted to have systems which can detect and record the use of such tuning boxes. We do know that the B9 S5 uses a pretty sophisticated Bosch ECU, but if it has such detection technology, I don't know.

So if you decide to tune a B9 S5 you have to accept 2 risks:
1) The single turbo V6 is a new design of engine with unknown reliability. With only a couple/few tuning solutions which are also relatively new, the reduction in reliability (and tuning always reduces reliability) is also unknown. As they say in the US - "you gotta pay to play".
2) So far using a tuning box has not risked warranty. Has that changed for the B9? No-one knows.
 

sparky86

Registered User
I spoke with my local Audi garage and Audi will honour the warranty of the car with an abt installed kit, provided that it is installed by an Audi dealer.

The stage 1 tuning for the s5 from abt is available from most Audi dealers in the uk


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RichardMMM

Registered User
Thanks Dippy, it make more sense now.
I think I'll pass on this for now, its quick enough anyways :)

I am tempted as mine isn't as quick as I hoped. I've not done 1000 miles yet so maybe it will improve as the engine loosens up.
 

KBB

Registered User
I spoke with my local Audi garage and Audi will honour the warranty of the car with an abt installed kit, provided that it is installed by an Audi dealer.

The stage 1 tuning for the s5 from abt is available from most Audi dealers in the uk


Sent from my iPhone using Tapatalk

What "brand" is your Audi garage? I'm at "Inchcape Audi" and they are not really helpful with modifications...
 

sparky86

Registered User
What "brand" is your Audi garage? I'm at "Inchcape Audi" and they are not really helpful with modifications...

It’s a lookers Audi

Best thing to do in doubt when dealing with abt is to visit their site and they will point you to their closest approved fitter (most Audi garages in the uk)


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KBB

Registered User
Thats what I did and it lists 17 dealers in the UK only 2 of them Audi, one in Bath the other one is Glasgow, well, non of them is close to me really.
 
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