For my setup (see signature), what can I expect from an upgrade K03 to K0422? What modifications are required? Exhaust manifold? Oil lines, coolant, etc? Is there a conversion kit available?

 

ko4-022?

 

Well, yes. There are K04-001, K04-015, then then K04-2X (20,22,23).

 

I am not sure that the K04-022 is compatible with our motors. I have never seen one put into application. Why are you set on this turbo as opposed to the 015 or an elim?

 

Quote:

Originally Posted by shortyxc

I am not sure that the K04-022 is compatible with our motors. I have never seen one put into application. Why are you set on this turbo as opposed to the 015 or an elim?

Simply availability (I could get my hands on one), but are not prepare to do the 'Enterprise' (going where no has gone before), which typically amounts to tons of work, time, trial and error, cost, headaches.

Currently looking at scrollproducts K04-SP51X "Outlaw" (claim for 230 hp)and K04-SP56R (claim for 275 hp). Any real world experience with those.

 

Well first thing first. How much power are you wanting to make? if you are only looking to get about 230hp then the k04-015 would be a great upgrade, especially with the other mods that you have. If you go any bigger then you will have to start looking at supporting mods too. ie FMIC, bigger injectors, etc. Here is a link to commonly applied turbos on our cars. It is very well done and could help answer a lot of your questions
https://www.audiforums.com/forum/b5-models-69/1-8t-turbo-upgrade-information-93439/

 

shortyxc, thanks for your input.

I decided a few hours ago, after 2 hours of valuable discussion with a local turbo geek (refered to by my trusty autozone turbo junky) to have a K04 custom built. I also had the option for a K03 with bigger compressor.

The guy is building the turbos (he is in the business since 30 years) to his specs (tight tolerances, modified compressor and turbine wheels, flow improvements, calibrated waste gate actuator, etc.). His place is a turbo freeks dream come tru (there must have been 500 or more wheels on the shelfs, and just piles over piles of housings, shafts, bearings, etc.)

He suggested the modified K04 based on
- my desire for fast spool/no lag, low end torque, mid range power, no interest in high RPM horsepower; no need for gazillion hp; no desire to do a ton of additional mods to suit the turbo
- our current setup (the straight pipe, no cat, high flow exhaust/muffler, hi flow intake/filter, tubes), which will work well with the wheels he has in mind.

I just posted elsewhere to find out what I must or should do once the new turbo is in.
- modify the TAP stage 2 chip to reflect the new setup. Who can do it?
- adjust boost (TAP sets it to 12.5 psi if I remember right) higher?
- other components who are not up to snuff anymore
- are the stock injectors stiff suffiicent

If you pin the K04-015 at 230 hp (crank I assume; with my current mods or on stock engine?), I would hope to see at least that number (or more)?

Scrollproducts has their 275hp K04-SP56Rwhich is probably going in the direction of my custom K04. But I trust my turbo geek to provide better quality AND do some magic on the wheel/housing.

 

To get anywhere near those numbers on a k04 you will need to be running 20+psi, dont expect much of a difference going from K03 to K04 when pushing 12psi.

You have a ndbw car, there is no option to tweak your tune. Only way to up the boost is to run a MBC.


BTW your K03 now is making about the same power a stock 2001 A4 makes which is about 170hp. You really do need to go with another tune if you really want to make more power with a turbo upgrade.

 

Mike, thanks for the input.

Bear with me, since I am still not fluid in 'Auditalk':

- ndbw car: what is ndbw (non drive by wire?). cincyTT (comments to newbie guide version 2): 'its DBC - drive by cable). Do I have that right?

- no option to tweak your tune: our other project car is a Mercury Cougar, just coming off a 3.0 l swap, intake/exhaust work, etc. That is DBC, too; yet there are a million ways to optimize the tune (fuel, spark, injections, transmission, etc.). Why can the B5 not be tuned? Why has the DBW an impact on tune?

- K03 now is making about 170hp: that would be disappointing. The stock is listed at 150HP, the TAP chip (and the boost increase from the stock (8 psi???) to 12.5 (chip???) should amount for more alone (or?), plus intake/exhaust.

- chaos92287 in his newbie post writes: Chip: a good one (around $500) will be getting roughly 40-50hp and 60-80 lbxft (I hope the TAP is a good one). Is he wrong? Or do I misread your or his numbers?

- same post: K04 ~235 HP

- chaos92287 and cincyTT recommend the K04 upgrade, specifically the GIAC: GIAC performance software for the 1999 - 1996 B5 A4 ® w/ K04-15 Turbo Upgrade smoothly delivers a 70-110hp and 110-190 ft/lbs gain. For optimum performance the software must be coupled with a K04 turbo.==> Their claim then is 150+70=220HP, 150+110=260HP (I don't know the torque number for the stock AEB engine).

- I did not drive the stock car, only with the basic mods (sans straight pipe) on it. But it sure (without the coming K04 mod) feels substantially (I am after torque, not HP at high RPM) stronger than "170 HP". The straight pipe seems to bring torque on even early.

- Looking at the maps of the KO3 (do you know which one should be on the car? , K03-011 (5303 988 0011) 150 hp, 65 N actuator?) and the KO4-015, (no expert by all means!) the KO4 should flow more (improve high RPM) and easier, and particularly benefit from the mods (intake and exhaust) more than the K03.

Still learning....
So, any response/comments gets me higher on the learning curve!

 

This is a dyno chart I found in May 1998 issue of european car magazine done for the TAP.

Stock RWHP: 138 HP at 5000 RPM
Stock torque: 148 at 2000 RPM
TAP RWHP: 162 at 5000 RPM
TAP torque: 190 at 4300 RPM

max HP gain: 39.5 at 4000 RPM
max torque gain: 51.9 at 4000 RPM

http://www.audiworld.com/news/99/reprints/tap.jpg