So I can run standard K04's with just MTM stg one software?

[S4AVT]

if you use MBC alone

[Tifosi]

Instead of your typical "STFA" reply, which does nothing constructive and is not at all helpful. If you don't feel like helping, then put your ego and your sorry-ass NJ attitude back into your little imaginary hoster.

[Tifosi]

[B5QShip]

friendly replies. This is one of the most commonly addressed topics of homebrewing, of which there is a plethora of information on Edy Jun's site.........but since I am bored and still stuck at work, I will explain in my reply to your other post below...

[Tifosi]

Trust me, as I am still running K03s and I will be more than happy to find out that it is not necessary to run any additional parts in conjunction with the K04s.

As for "attitude", if I indeed am giving out wrong information, then just correct me and give a real answer. I am sure all forum members here will appreciate it, instead of the typical useless "STFA" or a single line post that leads to nothing but a waste of bandwidth.

[B5QShip]

running K04s on stock software is perfectly fine. The only problem one might encounter, more likely in the case of the stage 1 chip, is boost spiking on ramp-up (ie, when you smash the throttle and boost builds). This is what JBear was trying to explain, and happens because the flow characteristics of K04s are different than what the engineers designed for (ie K03s). An MBC placed in parallel with the N75 can be used to eliminate boost spikes while leaving full control of boost ramp and taper to the N75. Mark P made an excellent diagram and explanation of this - STFA.

The 5bar FPR you speak of is commonly used for a Stage 3- setup. There is specific "3-" software made by GIAC, and you can also homebrew it using an MBC in place of the N75 (with extensive logging and tweaking, of course). Basically what you're doing is adding more fuel to enable you to run more boost (since K04s can make more boost at higher rpms). However, there is a limit to how much fuel the OEM injectors can provide. A 3- setup uses a 5bar FPR to increase rail pressure and deliver the maximum "safe" amount of fuel. I put "safe" in quotations because while it works okay, it probably takes it's toll on the fuel pump. The oem injectors are also working very near or above 100% duty cycle in this scenario, clearly not ideal.

If you want to run anything beyond about 16psi, you need to upgrade the injectors in addition to using a larger diameter MAF housing. This is the definition of Stage 3. The larger injectors enable more fuel to be delivered to the combustion chambers. If one were to run 20psi to redline with the OEM MAF housing, it would likely saturate at it's maximum value (>350g/s or something in that ballpark) and your car would begin to run lean on the top end (very bad, obviously!). By running a larger MAF housing than Audi engineers intended, we can "scale" the MAF values down so that the ECU sees MAF values within an acceptable window. Together with the larger injectors, we are basically fooling the ECU into thinking it's operating near OEM (well, not really, but close enough) flow rates [of fuel and air]. Lemmiwinks tweaks on K03 code, stage 3 software, or custom tuning provides the fine tuning to get a proper A/F ratio after scaling the injectors and MAF housing.

And there you have it. If you haven't already, look under homebrew on Edy Jun's site. Lots of good info there.

[B5QShip]

people type stfa because it's not easy to explain well in one or two sentences. It's been rehashed many times, so there really is good info in the archives. In any case, enjoy what i've written below....

[Rican_S4]

I don't need a 5 bar. I'll be just using different injectors and the ECU + k04s.

[JBear::FATS]

what software your running. The basic principal here is that K04's move more air, more air in the combustion chamber generally means more fuel to maintain an ideal A/F ratio.

Other issues are MAF sensor limitations based on the size of the MAF housing and related boost levels.

Larger injectors to provide that additional fuel.

If your K03's blow and you need a quick solution, install K04's and purchase the Stage 3- programming.

This is probably your safest bet if you are on a budget (outside of putting K03's back in). This way you don't have to learn about MAF scaling, A/F ratios etc etc.

Or just take it to someone, Piggie, Wicked etc.

Good Luck.

[Tifosi]

does not translate to "one can run perfectly fine on K04s with stage 1 software". If a problem can occur, than how is that setup running "PERFECT FINE"? There are those of us that are not seeking for the greater power a set of K04s can offer, but more for their greater reliabilty that they are suppose to have over their K03 sibilings. In other words, if one have to wonder and be wary of a possible problem that one may encounter with a specific setup, does it not defeat the entire purpose of going to K04s to begin with?

As you stated in your own post, the K04s are hardwares with different characteristics to the K03s, from both engineering and functional POVs, hence in order to RUN THEM PROPERLY, one will need to either upgrade ECUs and/or run additional mods. Now, how was my original post misleading again? Are we not basically posting the same thing?