Audi V8 4.2l engines - chip tuning?

[shone190]

Hi guys,

I know that turbo engines has good response on chip tuning, but what about NA engines, concretely V8 4.2l 32V 340HP from Audi S8?

I see that chip tuning companies show gain of about 20HP and 20Nm:

http://www.hs-elektronik.com/datenblatt-d/audi-s8-42-v8-340ps.html

Is this gain real to expect just from chip?

[quattrostyle]

Well the NA engines from let's say at least the last 5 years don't make the power the factory states. Know a guy with a S6 V10 which barely made the factory power after a custom remap...So yes tuning helps a bit

[prj]

Waste of time and money.
Put that money towards some new piston rings for your engine. Will give you much better results than any kind of ECU tweaking.

And for FSI engines - the problem with those is the carbon build up.

[shone190]

So they lie about power gain?!?!

[prj]

There can be a tiny gain, but you are not going to really feel it.

[shone190]

I don't expect to feel 20HP on 340HP off course, I just wanted to know is it real to except or is it 3-4HP real gain

[Henkjan]

if the engine is set up for RON95, and the custom map is for RON98 there can be a real gain, but nothing worth bragging about, in the range of 5%

[shone190]

5% is 17-18HP on engine which has 340HP

[EspenW]

I had the pleasure of testing a tuned version of the 4.2L V8 in the S6+ of an acquaintance. Remap, exhaust with race cats, etc. Stock power was 326ps. Tuner claimed 400ps.
It pulled 250hp at the wheels. Not impressed.
We actually saw a 5whp gain across most of the entire rev range when we replaced the K&N cone filter with the stock airbox and stock paper filter.

[shone190]

How is it possible to get 250HP at the wheels from tuned AHK, even ABZ has to pull 250HP at the wheels?!?!

[driftin jo]

How is it possible to get 250HP at the wheels from tuned AHK, even ABZ has to pull 250HP at the wheels?!?!

Simple maths, factor 20% drive train loss, you get
326-20%= 260.8

so 250hp at the wheels is not very surprising as it's only a 10hp
loss from factory quoted figure, take into account these engines
don't make factory power for much more than 6 months and there you go.

My mates S8 made 259 at the wheels, factory 340 crank, now giving 323
crank.