Power

[MattS5]

Here it is. Had 2 runs. (you may have to click on it to see it properly)

Blue line is run 1, red line is run 2.
Square line is BHP and Round line is torque.

reading the graph again, it looks like I may have had a little under 350 at 6500 revs, but only around 347 at least

Does that help?

[HoppyUK]

Ooo! Lovely data! From a real live UK car. Thanks very much for that Matt. Yes, you've got a pipe on it which should raise the levels a bit, but it's the shape of the curves that is so revealing and I don't think an exhaust will have changed that much.

First off, I notice your power peaks at 7,100rpm, not 6,500 as you said, and the bhp line continues to rise even after torque is falling away fast. This explains why revs are usually so important to an NA car, and why those loonies that tweak RS4 motors can gain quite a lot simply by lifting the rev limiter. It's a dangerous game, but there's free horse power up there.

The second thing is that the shape of your graph mirrors the one I found in official Audi literature, except that on theirs the power drops like a stone after 7,000 before the line stops at 7,200 (limiter level). I was suspicious of Audi's graphic which I'm cynically thinking has been 'adjusted' to show that there's no benefit to revving an S4 beyond the red line and right to the max. Clearly, there is, and if you were to push your car all the way to the limiter, you'd still be developing very useful power indeed. And the revs at the top are obviously worth more bhp than those lower down.

I've done some very rough calcs and while the figures may not be absolutely accurate (dynos never are ) the trend is quite clear. And that is, if you're going for it in your car and revving through the gears using the top 2,000rpm where there is most power, from 5,200 to 7,200* (* poetic license ) you have an average of 331bhp to play with. On the other hand, my car is Tiptronic and changes up at 6,750 whether I want it to or not, which means that if I use the top 2,000rpm that I have available, from 4,750 to 6,750, I have only 313bhp average - 18bhp less.

Yes, I've extrapolated some figures from your graph just to emphasise the point, but I'm sure they're not unrealistic. The trend is quite clear, and is actually just what you'd expect it to be. 18bhp is a useful amount extra and shows the importance of power over a range, rather than just a power peak, and is significantly more than the seven-odd bhp difference if you just take the maximum peak power figures produced at 6,750 and 7,000rpm.

I hope this is making sense! If you check the link I gave previously, you'll see why all this interests me

Thanks again,

Richard.

[MattS5]

Glad to be of help Richard.
I hope you get it sorted to your satisfaction.

(I must admit, I dont normally hold a gear past 6250rpm, as I prefer not work the engine that hard, especially when there isn't a real need to with all that torque)

[Scotty]

Here's mine : 2003 B6 S4 AMD stage :

Torque Graph

BHP Graph

[MattS5]

Crikey, they're pretty impressive figures!

Are those 2 lines on each graph before and after the AMD stage remap work, just overlayed on the same graph to give comparison.

The torque spread improvement looks great.

I wonder what i'll get with just the full milltek, but no remap.

[HoppyUK]

Here's mine : 2003 B6 S4 AMD stage :

Torque Graph

BHP Graph

Very nice Scotty

What's it like to drive?

[Scotty]

These graphs were when the car had 500 odd miles on it. It went straight from stock to AMD stage 3 (hence the two lines - before and after). AMD Stage 3 means its remapped and full Milltek (i.e. including down pipes, cats etc).

The power is smooth, strong and never ending. It can make you a very lazy driver. I've driven the car without the remap (I was getting Audi to update the throttle software) and it wasn't a huge change. It just seemed to lose the sharpness. I think Milltek alone is a big benefit. The really great about it is the noise.

My car's going soon and I'm really gonna miss the torque and tunes it played

.....but it looks like someone else will benefit from my Millteks, eh Matt ?

[MattS5]

.....but it looks like someone else will benefit from my Millteks, eh Matt ?