Leon Cupra turbo questions

[typhoon]

Hello everyone! I just bought a new Seat Leon Cupra and I was wondering if you could help me with some information about the turbo:

a) On how many rpm of the engine does it start to work/engage?
b) On how many psi/bar does it work?
c) What is it's name (K03, K04, K03S)?
d) How many rpm does it achieve? (the turbo-not the engine)

Excuse my ignorance, I am new to this.
Thank you in advance.

 

[Poverty]

ko4

and engages at a really low rpm, 2200rpm iirc

 

[DanGB]

bearing in mind that this is a completely different k04 turbo compared to the old 1.8T engines. it is about the size of a GT2860RS.

 

[bronquito]

My old 05' LCR got a KKK04-023 turbo. It will interesting to know the model of the MKII Cupra's one. Can't wait to drive my new car. Is still in Martorrell... Will be sailing across the Athlantic by the middle of March.

Cupra rules

 

[Thorgen]

BorgWarner Twin-Scroll K04

 

[chrisboyle999]

ko4

and engages at a really low rpm, 2200rpm iirc

it is alledged that boost effect is noticeable from as low as 1400rpm.

 

[cheungy]

off topic alittle but where can you find out what turbo you have? i don't really consider mine a turbo as its so small on the engine but would it be a serial code or a number on them?

 

[DanGB]

it would be written on the actual turbo yes. If its a borg-warner it will hae an information plate on it.

 

[cheungy]

I'll take alook / thanks

 

[robdf2]

it is alledged that boost effect is noticeable from as low as 1400rpm.

strange , i dont feel that on my car,

only real way to know for sure is to fit a boost gauge i guess???

 

[DanGB]

or log via vag-com the boost pressures.

 

[Thorgen]

off topic alittle but where can you find out what turbo you have? i don't really consider mine a turbo as its so small on the engine but would it be a serial code or a number on them?

1.4 TSI has BW K03, which also is a twin-scroll turbo. The K03 is also used in 1.8 TSI.
http://www.turbos.bwauto.com/press/newsArticle.aspx?id=152

 

[cheungy]

1.4 TSI has BW K03, which also is a twin-scroll turbo. The K03 is also used in 1.8 TSI.
http://www.turbos.bwauto.com/press/newsArticle.aspx?id=152

edit::
Am not sure if this is the correct turbo could be for the golf gt or the new mk6 golf, instresting though and if it was a K03 would be simple to swap to a K04?

sorry again i know its a offtopic (apolgies)

 

[robdf2]

or log via vag-com the boost pressures.

i know im lazy lol
is a good excuse to put a boost gauge in though

also my car feels faster when the engine is cold but as soon as the engine has warmed up seems slower to rev and torque seems to move further up the rev range .

 

[typhoon]

So, up until now we have the name of the turbo [BorgWarner Twin-Scroll K04] (thank you Thorgen) and that it engages at 2200 rpm (maybe).

How about on how many psi/bar it works? Nobody knows?

As for the rumor that you can fell the boost as low as 1400 rpm, I deny it! I own the car and I don't feel anything until the 2500 rpm or little lower. Anyway are you saying that it engages at 1400 rpm then???

 

[Thorgen]

The engine reaches it peak torque of 300 NM at 2200 rpm. It means that at this point the ECU starts to limit the engines output torque, not the point where the turbo "kicks in". The turbo works way earlier as the naturally aspirated 2.0 FSI can only achieve 200 NM of torque (and with way higher RPM). The obvious choice to find out at what RPM the turbo starts to give more power than it takes is to compare the 2.0 FSI & 2.0 TFSI torque graphs and see where they cross. Of course the engines are very different from each other, but at least that way you can get some indication of where the turbo starts to pay off.

 

[Thorgen]

Well that didn't take long.
http://www.rri.se/popup/performancegraphs.php?Flap=Graph&ChartsID=157
http://www.rri.se/popup/performancegraphs.php?Flap=Graph&ChartsID=846

It seems that 2.0 FSI reaches 150 NM at 1500 rpm and 2.0 TFSI (with K04) reaches the same 150 NM already at 1000 rpm. So, this pretty much means that the turbo engine provides way more torque than the NA engine from idle rpm.

 

[chrisboyle999]

As for the rumor that you can fell the boost as low as 1400 rpm, I deny it! I own the car and I don't feel anything until the 2500 rpm or little lower. Anyway are you saying that it engages at 1400 rpm then???

"Kirchheimbolanden, 14 July 2006 – BorgWarner Turbo Systems confirms again its position as a leading supplier of turbocharger technology for spark-ignition engines. The automotive-supplier has developed a new K04 Twin-Scroll turbocharger which will be used for the first time in a spark-ignition engine with direct fuel injection and turbocharging. The engine will be launched soon onto the US market. In this market, BorgWarner sees a high potential for vehicles that need powerful, yet fuel- and space-efficient engines. The carefully matched turbocharger ensures immediate engine response while providing excellent fuel economy and low emissions within an extremely compact design. At 194 kW (260 bhp) and 353 Nm (260 lb.-ft) the 2.0-l Turbo engine provides approximately the same performance as larger V6 units but with better fuel economy.

The K04 Twin-Scroll turbocharger from BorgWarner Turbo Systems also features an integrated blow-off valve and a high efficiency turbine wheel. The Twin-Scroll turbine design further ensures that exhaust pressure pulses are effectively utilized at low engine speeds, thus optimizing the ratio between charging pressure and backpressure. The boost effect from the Twin-Scroll turbocharger is evident as low as 1400 rpm and ensures optimum response even at low engine speeds."

a turbo doesnt 'engage' anything. it turns constantly, but you may not necessarily notice until it is spooling fast enough to be forcing air into the engine.

 

[typhoon]

Thank you both! (Thorgen & Chrisboyle999)

You gave scientific answers!

I was under the impression (wrongly obviously) that the turbo starts to work after a specific number of rpm has been reached shutting the atmospheric air suppliance of the engine and starting providing pressurised air only.

 

[Al]

Spoke to a company tha refurb and upgrade turbos this morning and they reckon that they can refurb the K04 Cupra turbo and include a new thrust bearing for better reliability and shorten the shaft for better top end power through ability to run slightly higher boost, although this would be at the expense of the spool point being a bit higher up the revs.

Only snag is you would need a custom map to take advantage of it. I am going to try and find out a bit more about the person who has had this done already (who according to the company I spoke to is very happy with the result).