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Hello guys,

What would be the best setup to move on to. I am currently running stock turbos, the car is chipped it has a FMIC aswell as a few exhaust mods.
I was trying to figure out what pair of turbos tp purchase, but could not find any good comparisons. Currently i could buy pair of RS4 K04s and then have them upgraded to RS6 hybrid, it seems to be a pretty good combination as much as i have read. Or is a cheaper and equally good option going with a pair of GT25R or GT28R ? Any good information would be mos appreciated...


Oh, and to show off a bit, here are some pics of my car. I will post updated pics later, the car now has RS4 front bumper aswell...

in action...


more pics here:
http://pildid.audiclub.ee/liikmete_autod/ren



Forgot to add that the goal is to have 500hp on pumpgas 98 octane (93 US)
Thanks in advance if anyone cares to respond and give some professional advice. I am anxious to buy a set :p

don't know anything about mods but your mota looks good and pimped. what body kit is that and how far have you lowered?

ronaldmacdonald wrote:don't know anything about mods but your mota looks good and pimped. what body kit is that and how far have you lowered?

rear is custom widebody, the front in the pics is also custom modified from original S4 front. But after a slight accident i decided not to fix the front but go with the RS4 one instead. No pics of that currently. As for the lowering, the car has H&R coilovers.

It looks superb Renarl, and I bet it looks even better now you've got the RS4 front bumper - looking forward to the pics...

What wheels are those please?

As for the turbo upgrade, I guess you'll need RS4/RS6 hybrids to get that sort of power. MRC Tuning are working on some of these mods at the moment, so drop them a line.

Excellent widebody there Renarl

If your going down the big power route you should get the hybrids as mentioned although standard K04s suit most peeps.

CliveH wrote: What wheels are those please?

love those wheels - really suit the slammed widebody avant. think theyre mille miglia avs

Love that exhaust, car looks great.

Is it a tiptronic? If so gonna need some work doing to the boxes electronics to support those sort of numbers without problems.

@kaygee what makes u think its tip.?? he mite not have a short shift and he,s put it in 2nd,4th or 6th gear...seem to remember my standard stick havin a throw like that..

Thanks for the kind words guys.

The wheels are Mille Migila, that is correct. They cost about 325 USD per wheel here in Estonia, so they are not too expensive and look great. I am also pretty happy with the choice of the wheels to match the body:)

As for bigger power, i will soon be getting RS4 intake manis and cylinder heads from Germany off one crahsed RS4. I am also waiting to get a total price from Vast Performace for open intake element and new MAF combo currently to order those. So i am piecing it all together at the moment. I haven't quite figured out yet what i want to do with the fuel on the injectors part. I already have a walbro which i need to put in.
The car is 6-speed, not a tip. I have not seen a single tip here in Europe, so it is 6-speed all the way for me. I am going to rebuild the tranny soon, since when i slam it into 2nd hard, i can hear and feel the synchros quite bad. And the car is in 2nd gear there

So, am i correct that the GT25R and the GT28R are not comparable/suitable to the hybrids? If so, why ?

Renarl,

Just thought I'd check about the tranny, no offence intended!

GT25R and GT28R kits are being done in the US, producing some really good subjective results, however so far not sold as a kit. Price is quite high also around 15K USD and the car needs shipping to the US.

Innovative or Buehn will do you a set of k04/Rs6 or k06/k16 hybrids for a lot less that are bolt on replacements. These however would require eiither some major tweaking with lemmiwinks if you're happy to tune yourself and take the risk of getting it wrong and buying a new engine or have a custom tuner who could do the tuning for you (Mihnea at MRC tuning or maybe some of the German tuners might be an option).

There is a new tuner looking to put together a t03 kit, target is to be similar pricepoint to K04 turbo upgrade. Power expectations around what you are looking for.

As for the tranny try stassis in the US, they do a rebuilt and hardened std tranny or a shorter geared box for track work if you'd prefer.

For the injectors try racetronix/delphi/siemens 60Lb they have drop in injectors for the s4 and RS4 fuel rails. You'll need the RS4 fuel rail for use with the RS4 manifold as well as the throttle body and front boost pipes.

KayGee, i know there are no GTxx kits in Europe. I am not looking to buy a kit actually. I would be piecing it together on my own anyway. So that is not my main concern.
I have asked Buehn and they have quoted me 1660 per piece on the K04/RS6 hybrid (is that a good price?). As for tuning, i am not worried, i will probably have SKN or MTM to do it.
Is the stock fuel rail enough for 60Lb injectors? Will they fit RS4 manifold?
I could then buy the injectors and rail also if needed.

Nice S4 you have there

I see you have done the same mod withe the fuelcap as I have
And the rear widebody.

http://www.garaget.org/?car=10088 <- my car

Good price on the turbos. You'll need bigger MAF housing for 500 Bhp. AWE, ASP and Jacob do aftermarket or go with RS4 item which can support around 500 Bhp.

60lb injectors can be bought for S4 and RS4 fuel rails. No one has reported maxing the fuel rails as yet.

You'll need an uprated fuel pump - Bosch (dear), Walbro (cheapish) and RS4 (dear) and possibly a adjustable Fuel Pressure Regulator if the idle proves problematic.

Although no one is reporting rough idling with these injectors as yet.

If you are not scared of a bit of work, might want to consider straight RS6 turbos. Slightly more work fitting them...should be able to pick them up quite a lot cheaper than hybrids though....

Might be a bit ot but i'll ask anyway..


KayGee; i have recently changed to a brand new oem S4 fuel pump (the old one gave up on me) is that one enough for providing right amount of fuel to a K04 application?

Depends what injectors and boost levels you are running.

Stock S4 fuel pump is rated to around 340Bhp on stock injectors. A lot of people run them closer to 400Bhp. RS4 fuel pump comes out around 420bhp. Some people push those to 470Bhp. Again well beyond what they are designed for. Not cheap to buy either.

For the cost of a replacing a fuel pump I'd rather not risk trashing an engine. Bosch and Walbro 255lph units are good for conservative 550-650Bhp depending on application.

Is this what we're looking at Kevin...?
http://cgi.ebay.co.uk/Uprated-Walbro-25 ... dZViewItem