Unitronic k04 file with F21 turbo

[Bouhlee]

unitronic told me that is was a problem is that true ?
''their file is DONE only for BW K04''

[Audibot]

That's probably an insurance in case something happens. I'm not really on the up and up on B5s, but business-wise, I am having to deal with a lot of vendors that won't guarantee their products if it's taken beyond what it was qualified to do. Running a different turbo certainly would be in that category.

[JVD]

Different size turbos.

Ya, they say it for a reason.

[somedude]

Different size turbos.

Ya, they say it for a reason.

give me your ECU code I can double check their tune database to see if there is a FT21 tune listed

[Drehmoment]

A KO4 tune will overboost like crazy due to different WG spring set up on the Franks

[01audia4]

A KO4 tune will overboost like crazy due to different WG spring set up on the Franks

This. Not really the "size" that is the issue more or less the fact that the WG pressure is different 12psi vs 8 on a K04(usually)

I mean I guess if you really wanted you could run it with an MBC..But don't be cheap get the right software for hardware. Contact Daz he does good tunes and for a great price.

[CELison]

This. Not really the "size" that is the issue more or less the fact that the WG pressure is different 12psi vs 8 on a K04(usually)

I mean I guess if you really wanted you could run it with an MBC..But don't be cheap get the right software for hardware. Contact Daz he does good tunes and for a great price.

This. The wg cracking pressure is different.

[AudiTechS4]

why do these threads keep poping up . get a tune for what you have . simple as that. you have k04's get a k04 tune. you have something else tune for that . what is wrong with people lol its pretty well documented that the turbos has different cracking pressure on the wg and yest people cant read through a few posts and figure it out

[b5s4carlos]

Run it, blow your turbos and then realize they aint for f21's because obviously their for K04's
Dont cheap out do it right the first time around to avoid headaches later on.

[S4James]

I cant believe anybody on this forum would run unitronic after the BS they put some of us through

[John@Unitronic]

As you discussed with Steve, we do not have a specific "production" calibration for use with the Bosch 550cc injectors and Frankenturbo's you're currently running. We do offer a Stage 2+ calibration for OEM inj, OEM MAF housing and RS4-K04's, but unfortunately as others have mentioned already in this thread, due to the difference in WG preload/response, that cal. won't provide optimal results, allow for proper boost control, or run well with your Bosch 550cc injectors. Sorry! If you have any other questions, please don't hesitate to contact me directly; or Steve if you prefer to discuss in French.

[zillarob]

Not saying its the best idea with all the fairly priced options nowadays, but parallel mbc might get you by.

[Bouhlee]

it is not a question to be cheap i never realise that when a swap the turbo. i bought a s4 suppose to have BW k04, when the turbo go bad 2 or 3 week after i swap to used F21 i found locally. the turbo remove was k03..... anyway

[Bouhlee]

As you discussed with Steve, we do not have a specific "production" calibration for use with the Bosch 550cc injectors and Frankenturbo's you're currently running. We do offer a Stage 2+ calibration for OEM inj, OEM MAF housing and RS4-K04's, but unfortunately as others have mentioned already in this thread, due to the difference in WG preload/response, that cal. won't provide optimal results, allow for proper boost control, or run well with your Bosch 550cc injectors. Sorry! If you have any other questions, please don't hesitate to contact me directly; or Steve if you prefer to discuss in French.

no hard feelings against john I just wanted to check with the comunity , always good to have a second opinion ( no sur that sentence is correct i use google translate ;) )

[FlyboyS4]

unitronic told me that is was a problem is that true ?
''their file is DONE only for BW K04''

Looking strictly at the turbochargers, not fueling, it would depend on what boost profile they tuned the K04's for. A tame dc like APR ran would not have the F21's operating much beyond 24-25 psi. I used a k04 wgdc tune to start tuning on my F4H's and nothing extreme happened, it just wasn't as good a match as you'd aim for when tuning the car.

[Bouhlee]

Actually i boost 20-22 psi so i guess that can do the job for couple of week, I hope so haba