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Im new to this site(so hello) & have just had my s4 avant chipped to 305BHP - Can anyone tell me what the performance difference would be say - 0-60,0-100 & 1/4 mile. Bit of a sad question but i thrive on this stuff! [img]images/graemlins/s4anogaro.gif[/img]

Hello lucas and welcome to RS246.com
Im not a S4 owner so cant really say, what chip did you get?

Hi Lucas,

I must say that times are not really my field of interest, but based on what I have read (and I have read a lot), your chip is likely to improve your 0-60 time by nearly 0.5s.

However I wouldn't recommend doing many 0-60s as the gearbox on the S4 is not really up to it.

All i know is that it is from Superchips.co.uk costs £511 & gives an additional 40-45bhp. Any good?

Thanks for the info - i wonder how it compares to the RS4 - i guess i'll have to wait & see!

Don't forget that the bhp addition is for the peak figure alone, and this is merely a small part of overall performance of the car. Personally I find that the effect on torque over the whole rev range is more important.

Your car should now have more low and midrange torque than a stock RS4, giving it better instantaneous acceleration. However the RS4's internal tuning keeps the torque high at the top end and hence the 380 bhp quoted. Thus in continuous acceleration a stock RS4 would outrun you. In basic terms your S4 would be similar to a stock RS4 in a 0-60 run, but in the 0-100 and 1/4 mile the RS4 would be significantly ahead.

And of course there are not many stock RS4s left anyway!

Our cars are most restricted by the cats. A full Miltek system with remap can easily get an S4 to around 330-350 bhp which is flat to the redline.

Sounds like you know your stuff - how much of a performance difference will the milltek make ?

As I wrote, I'm not really into timings so I can't answer you in that way. However I guess that your chip is the same as others in that you feel the car stop accelerating when the revs go above about 5000-6000rpm?

That's the restriction of the OEM cats. Put the Milteks in and the increased airflow means that the car still pulls all the way to the redline. The effect is that I guess that my car would match a stock (repeat stock) RS4 to 100mph and probably not be far behind in the quarter mile.

However please note what I wrote - that you need a remap to take advantage of the Miltek cats, as you'll need more fuel at high revs. Indeed without a remap you risk running too hot anyway.

Dippy has just told you up to 330-350.

I have an AMD chipped S4 and have also driven a stock RS4. What Dippy says is correct. The stock RS4 isn't noticeably quicker than a chipped S4. If just driving it without any means of comparing the two. Where you notice the big difference is where I find it's best to change around 5000rpm max the K04 turbos on the RS4 appear to provide the volumetric capacity to keep that baby running right up to a 6000rpm change. I dare say the improved flow in the RS4 heads also contributes.

Well at least I feel the K03s are running out of puff. This is where the increased flow CATs show their qualities as Dippy etc can vouch for.

Do the high flow cats make emissions more difficult to pass on the MOT???

Joules,
My S4 with K04's and the milltek cats went through the MOT with no problem at all, (the day after the conversion), I did ask the tester after it had passed about this and he had not noticed anything different.

I bought my Miltek system on the full understanding that it would meet MOT emission rules. I'm glad to now hear a case where this is proven true.

Joules,
My S4 with K04's and the milltek cats went through the MOT with no problem at all, (the day after the conversion), I did ask the tester after it had passed about this and he had not noticed anything different.

Cheers for that...