K03 Sport Turbo
#1
06-04-2013 | 08:41 PM
Thread Starter
|
1st Gear
Joined: Nov 2011
Posts: 85
K03 Sport Turbo
So i've been looking around and cant seem to find a K04 for my a4 anywhere.. I came across a free K03s and it was given to me because my friend upgraded to a bigger turbo on his b6. I have a 99.5 aeb with a GIAC tune fmic full exhaust and intake. Is it worth putting on ? will I notice anything?
#2
06-04-2013 | 09:24 PM
So i've been looking around and cant seem to find a K04 for my a4 anywhere.. I came across a free K03s and it was given to me because my friend upgraded to a bigger turbo on his b6. I have a 99.5 aeb with a GIAC tune fmic full exhaust and intake. Is it worth putting on ? will I notice anything?
#3
06-04-2013 | 09:32 PM
2nd Gear
Joined: Jul 2012
Posts: 988
From: Warrenton VA
You will produce no more power if that's what your asking, but you wouldn't with a k04 either, you have to get tuned for the turbo to get the benefits of it. Ill take that k03s off your hands if you want 
(I wish haha)
(I wish haha)
#4
06-05-2013 | 04:01 AM
Legal Moderator
Joined: Oct 2008
Posts: 1,975
From: st cloud, mn. you too? hit me up...
its a common misconception that there is a k03s. the only reason people think 2001+ a4's have upgraded turbos is because they have more power. while the turbos have been upgraded, the extra power is because of the extra boost and revised mapping. a chipped 97 will have the same power as a chipped 01
#5
06-05-2013 | 12:03 PM
Moderator
Joined: Jan 2010
Posts: 1,973
From: Costa Mesa, SoCal
Well, almost 
'01 has wideband so most tuners can squeeze out a few extra HP compared to a narrowband similar-tuned '97.
But to the OP: don't replace your turbo with this one you got for free, unless your current turbo is going bad.
'01 has wideband so most tuners can squeeze out a few extra HP compared to a narrowband similar-tuned '97.But to the OP: don't replace your turbo with this one you got for free, unless your current turbo is going bad.
#6
06-05-2013 | 01:42 PM
2nd Gear
Joined: Mar 2010
Posts: 630
From: Upstate, NY
its a common misconception that there is a k03s. the only reason people think 2001+ a4's have upgraded turbos is because they have more power. while the turbos have been upgraded, the extra power is because of the extra boost and revised mapping. a chipped 97 will have the same power as a chipped 01
Left is the K03s Right is the K03
In the red is a hole the k03s has, and the K03 doesn't
In blue is an indent in the K03 that the K03s doesn't have
In green is the difference in overall size about the circular part at the top
There's probably more, I'm not sure.
Also, the K03s has 1 K in the triangle, the K03 has 3 K's in the triangle on the side
Sorry for the bad phone picture
Last edited by meloman; 06-05-2013 at 01:47 PM.
#7
06-05-2013 | 01:50 PM
Legal Moderator
Joined: Oct 2008
Posts: 1,975
From: st cloud, mn. you too? hit me up...
There actually is a k03s that came on the 01's. When we took apart my brothers car we noticed that the hotside of his k03 had two cracks, so I just gave him the hotside off my old turbo. They ended up being different, k03s having a ever so slightly larger hotside. Let me find the picture he took showing the differences.
#8
06-05-2013 | 02:03 PM
Legal Moderator
Joined: Oct 2008
Posts: 1,975
From: st cloud, mn. you too? hit me up...
take it for what it is worth
The facts about the K03 Turbo! for those of you too lazy to click a link
The facts about the K03 Turbo! for those of you too lazy to click a link
The Question
I type this e-mail to you on behalf of many Audi enthusiasts, and myself as an Engineer, who ponder on the same question, as to the interchange-ability of the K03 and K03S turbocharger units.
As a member on one of the largest Audi forums on the web
(Untitled Document), as well as a member on many other Golf and Audi forums, I have often seen this subject raised but with no definitive answer ever given, due to a lack of information available. Audi dealers are not technically inept enough to offer an answer, Audi UK are not interested in answering and most aftermarket tuners opt for either the K04 or other brands of turbo so appear not to of looked into the subject.
So the questions are simple;
Can the K03 turbo (5303 988 0011 or 5303 988 0053) be directly replaced by the K03S (5303 988 0052 or 5303 988 0026) in terms of the intake and exhaust housing dimensions?
Is K03S the correct designation for the latter turbo mentioned above?
Obviously if a K03S was fitted an engine map could be changed to suit, but would a standard turbo map for the K03 be suitable for running a K03S on?
or would a loss of power be expected? and are the characteristics of the two very similar?
I hope you can assist with the above and any information you could supply would be gratefully accepted.
It's taken me a couple of weeks to get a response, but the response was well worth it, I think you'll agree.
The Answer
Dear Sir,
thank you for your interest in our products.
First of all, we don't produce any turbo that we call K03S. But I hope I can
answer your questions with the following explanations.
All the following turbos have the same installation dimensions and
thermodynamical performance. The differences are only in the actuator that
opens the turbine bypass valve:
K03-011 (5303 988 0011) 150 hp, 65 N actuator
K03-026 180 hp, 85 N actuator
K03-035 180 hp, 85 N actuator
K03-044 150 hp, 65 N actuator
K03-045 156 hp (Ibiza Cupra), 85 N actuator with 2 ports
K03-049 150 hp (Sharan/Alhambra), 65 N actuator
The 180 hp versions have an actuator with a higher opening force due to the
higher exhaust gas pressure (which is a consequence of the higher boost
pressure). Otherwise the valve would be pushed open by the exhaust gas
pressure.
The following turbos are a further development (since 2000) and have an
improved and slightly larger compressor while using the same turbine (still
with the same installation dimensions):
K03-052 180 hp, 85 N actuator
K03-053 150 hp, 85 N actuator
K03-058 150 hp/180 hp, 85 N actuator
Consequentially, putting a 180 hp turbo on a 150 hp engine will not bring
about any change in performance, but putting on a K03-052/053/058 instead of
the older versions will bring a slight improvement in engine efficiency.
Additionally, with re-mapping the ECU you can achieve about 215 hp without
danger of overspeeding the turbo. With the older turbos, 195 hp is the
limit.
With the K04 that's also commonly used (5304 950 0001) the power output
should not be more than 220 hp. That means, changing a K03-052/053/058
against a K04 does not make a lot of sense.
I hope that these details answer your questions. If you need more info, one
of our service distributors will be glad to help you. Their addresses are on
our website TurboDriven.com - BorgWarner Turbo Systems.
Mit freundlichen Gr��en/Best regards,
BorgWarner Turbo Systems GmbH
I type this e-mail to you on behalf of many Audi enthusiasts, and myself as an Engineer, who ponder on the same question, as to the interchange-ability of the K03 and K03S turbocharger units.
As a member on one of the largest Audi forums on the web
(Untitled Document), as well as a member on many other Golf and Audi forums, I have often seen this subject raised but with no definitive answer ever given, due to a lack of information available. Audi dealers are not technically inept enough to offer an answer, Audi UK are not interested in answering and most aftermarket tuners opt for either the K04 or other brands of turbo so appear not to of looked into the subject.
So the questions are simple;
Can the K03 turbo (5303 988 0011 or 5303 988 0053) be directly replaced by the K03S (5303 988 0052 or 5303 988 0026) in terms of the intake and exhaust housing dimensions?
Is K03S the correct designation for the latter turbo mentioned above?
Obviously if a K03S was fitted an engine map could be changed to suit, but would a standard turbo map for the K03 be suitable for running a K03S on?
or would a loss of power be expected? and are the characteristics of the two very similar?
I hope you can assist with the above and any information you could supply would be gratefully accepted.
It's taken me a couple of weeks to get a response, but the response was well worth it, I think you'll agree.
The Answer
Dear Sir,
thank you for your interest in our products.
First of all, we don't produce any turbo that we call K03S. But I hope I can
answer your questions with the following explanations.
All the following turbos have the same installation dimensions and
thermodynamical performance. The differences are only in the actuator that
opens the turbine bypass valve:
K03-011 (5303 988 0011) 150 hp, 65 N actuator
K03-026 180 hp, 85 N actuator
K03-035 180 hp, 85 N actuator
K03-044 150 hp, 65 N actuator
K03-045 156 hp (Ibiza Cupra), 85 N actuator with 2 ports
K03-049 150 hp (Sharan/Alhambra), 65 N actuator
The 180 hp versions have an actuator with a higher opening force due to the
higher exhaust gas pressure (which is a consequence of the higher boost
pressure). Otherwise the valve would be pushed open by the exhaust gas
pressure.
The following turbos are a further development (since 2000) and have an
improved and slightly larger compressor while using the same turbine (still
with the same installation dimensions):
K03-052 180 hp, 85 N actuator
K03-053 150 hp, 85 N actuator
K03-058 150 hp/180 hp, 85 N actuator
Consequentially, putting a 180 hp turbo on a 150 hp engine will not bring
about any change in performance, but putting on a K03-052/053/058 instead of
the older versions will bring a slight improvement in engine efficiency.
Additionally, with re-mapping the ECU you can achieve about 215 hp without
danger of overspeeding the turbo. With the older turbos, 195 hp is the
limit.
With the K04 that's also commonly used (5304 950 0001) the power output
should not be more than 220 hp. That means, changing a K03-052/053/058
against a K04 does not make a lot of sense.
I hope that these details answer your questions. If you need more info, one
of our service distributors will be glad to help you. Their addresses are on
our website TurboDriven.com - BorgWarner Turbo Systems.
Mit freundlichen Gr��en/Best regards,
BorgWarner Turbo Systems GmbH