S4 K04 Conversion

[Prawn]

Interested to know who has had this done and what your thoughts are on it.

I have looked at changing to an RS4 but just can't afford it yet, so K04's it is then [img]images/graemlins/nodder.gif[/img]

Are there any other mods that you would think essential at the same time, I am currently thinking RS4 clutch, lightened Flywheel and suspension mods at the same time.

Cheers Chaps.

[Joshie]

Hi Shaun,

I have had the big turbo conversion undertaken which was completed last September - about 3000 miles ago.

AmD carried out the work which involved KO4's, Milltek, DP's (I had the cat back already) and new hoses although the car has the APR bi-pipe so I didn't need the TBB.

At the same time I asked them to fit an RS4 clutch. Total bill was c£6K

On the rollers they got 395 BHP. Since then I have added a couple of other mods [img]images/graemlins/smirk.gif[/img] [img]images/graemlins/wink.gif[/img] which has boosted peak torque to around 460LbFt.

The mods transform the car - immediately noticable is the sound it makes which I think is musical. But the difference between that and an S4 which has a simple remap is huge. and with respect to RS4 owners it will see off a standard RS4 comfortably.

[Dippy]

Since then I have added a couple of other mods [img]images/graemlins/smirk.gif[/img] [img]images/graemlins/wink.gif[/img] which has boosted peak torque to around 460LbFt.

I didn't know that. What did you have done?

[Blueone]

Yep worth doing - only got 20k miles from my K03s - done a further 40K on the K04s - no problem at all - I did think that I would have a few teething troubles - given the level of surgery [img]images/graemlins/smile.gif[/img]

[Joshie]

Since then I have added a couple of other mods [img]images/graemlins/smirk.gif[/img] [img]images/graemlins/wink.gif[/img] which has boosted peak torque to around 460LbFt.

I didn't know that. What did you have done?

[img]images/graemlins/wink.gif[/img] [img]images/graemlins/wink.gif[/img] [img]images/graemlins/smirk.gif[/img]

[ChelseaMick]

The mods transform the car

Blimey!
I can vouch for that.
Really quick car.
Ian took me for a thrash around Castle Coombe and it rocks [img]images/graemlins/clap.gif[/img] [img]images/graemlins/bowdown.gif[/img]

[Joshie]

Thanks Mick.

Thing is that I still have a wish list of modifications. Trying to find out if a new MAF, airbox and injectors from the RS4 are likely to give me more performance. Anyone know?

[Nige_RS4]

Ian, you should be putting out closer to 450BHP with those mods and a(nother) re-chip. Ask on AW and say you're running 100 octane fuel and see what repsonse you get. Also, check out this graph.

Nige.

[Joshie]

Well I was hoping that with the new Maf, injectors etc plus a remap I would be able to get the power well over 400?

Interesting site BTW - might pick myself a few items up [img]images/graemlins/wink.gif[/img] [img]images/graemlins/wink.gif[/img]

[Nige_RS4]

Yeah, however unless you've got access to someone Stateside, it might be easier to make a note of the parts you will need for the full conversion and buy them from VAG parts - afterall, RS4 parts come from Europe in the first place?

[Joshie]

Well, yes, I was thinking of using VAG parts but there are a number of items which are interesting all the same.

VAG parts would, of course, be the first choice though.

[Blueone]

So have I got this right?


S4 2.7T plus K04 plus AMD remap plus miltek plus intake pipes = 395bhp

With an MTM chip, such as mine, this combination = 345bhp.


Is the AMD remap so much better at producing the goods?

I understood that in order to get to 395 ish - you would need to add the fuel pump with injectors plus a few other RS4 bits.

[Dippy]

Surely you'll only get above 400 bhp by significantly increasing the airflow, which is why you 'might' need the uprated MAF and injectors, on the assumption that the stock S4 units 'run out of steam' (which is a reasonable assumption since the RS4 needed uprated units).

HOWEVER increasing airflow means an increase in boost, with a resulting decrease in potential lifetime of the turbos. Also please question what else you need to change. I know that the RS4 engine has a lot of uprated components inside, not least of all different cams and different exhaust manifold (not certain about that though). Again, why would Cosworth have changed all these parts if they didn't think the engine needed it for 'just' 380 bhp?

Also don't forget that although many of our American friends are getting well over 400 bhp out of their S4 engines, they definitely are doing serious mods!!!

[quattropaul]

Someone mention VAG Parts [img]images/graemlins/cool.gif[/img] [img]images/graemlins/thumbs.gif[/img]

[Joshie]

HOWEVER increasing airflow means an increase in boost, with a resulting decrease in potential lifetime of the turbos. Also please question what else you need to change. I know that the RS4 engine has a lot of uprated components inside, not least of all different cams and different exhaust manifold (not certain about that though). Again, why would Cosworth have changed all these parts if they didn't think the engine needed it for 'just' 380 bhp?

Well frankly I'm not sure that the lifetime of the turbos is a particular issue here. I know that turbos and me don't seem to be entirely compatible [img]images/graemlins/1syellow1.gif[/img], but surely even if serious modifications halfed their lives this woud still represent good reliablilty.

As far as the other mods are concerned I can't help being cynical in thinking that if Cosworth had told Audi that all that was required was a couple of KO4's and new downpipes they really wouldn't have done themselves justice. No - far better for Cosworth to apply the belt and braces principle, get the 380 BHP by increasing airflow and injector flow rates and then bolstering the structural integrity of the engine (crank, con rods, new heads) for good measure. Now that's a job well done Cosworth comrades and the engine is even more bullet proof than before. [img]images/graemlins/cool.gif[/img]

Also don't forget that although many of our American friends are getting well over 400 bhp out of their S4 engines, they definitely are doing serious mods!!!

Yes, agreed - no stone unturned in maximising the specific outputs so it seems [img]images/graemlins/clap.gif[/img] Cool, far out, gee whizz [img]images/graemlins/burnout.gif[/img]