All Things Mk5 > Performance Modifications

clutch needed for a stage 2+ k03??

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Stooey:
Maybe a silly question but would a stage 2 k03 require an uprated clutch? If not I may sell my loba hpfp

Madone:

--- Quote from: Jay75 on March 28, 2015, 08:39:21 am ---I can only speak for myself buddy, I don't see the point of it personally. If money's no object to you and you want to squeeze every drop of power you can from the ko3 then do it. I think people get a bit carried away with stage this and stage that, it's just a way tuners can sell their services with set prices and appeal to customers more. All that's really needed for great gains on a ko3 is a turbo back exhaust with sports cat, (which will sound great) a decent cold air intake (which will also sound great)  and a decent map, and if it's not mapped to its absolute limits your standard hardware is fine. Decent tyres with the right pressure, stiffer suspension and maybe a sports front engine mount will all add to the overall performance and you'll have a quick car without worrying about eating clutches and smoking turbo's. Then there's the fact that you've paid out hundreds of pounds on a fuel pump and you can only ever have 10% of its potential! It's just my opinion dude and I do admit I'm a bit of a square when it comes to the old cost to gain ratio... Feel free to rubbish my thoughts people, I really don't mind  :signLOL:

--- End quote ---

What Jay has said does sound like  sense to me. The K03 cannot supply air volume anything like the K04, the K04 only needs a pump at stage 2+ which is around 340bhp upwards. Bearing in mind to make power you need fuel and air in a certain ratio, why would a K03 providing less air than a K04 need more fuel ?.

Dan_FR:
You're all forgetting that the pump is driven mechanically by the engine. Whilst the standard pump can supply fuel for 360hp at 6000 rpm, at 3000 rpm it can only make half that. (Or thereabouts)

On a K03, going stage 2+ allows more torque and more grunt below 4k rpm. Above that I couldn't really notice a difference. Not the same bang for your buck compared to a K04 but it's certainly not a waste.

Madone:

--- Quote from: Dan_FR on April 21, 2015, 08:14:41 pm ---You're all forgetting that the pump is driven mechanically by the engine. Whilst the standard pump can supply fuel for 360hp at 6000 rpm, at 3000 rpm it can only make half that. (Or thereabouts)

On a K03, going stage 2+ allows more torque and more grunt below 4k rpm. Above that I couldn't really notice a difference. Not the same bang for your buck compared to a K04 but it's certainly not a waste.

--- End quote ---

I'm still not quite understanding the logic, the pump is mechanically driven, so say for example at 3000rpm it produces 40bar, as it is mechanically driven it will always produce 40, that is fixed by the pump being driven by the camshaft. Now at 3000rpm the ecu wants 30 bar, the electronic valves in the pump give 30 to the rail, the rest is bled off I assume. Now a stock pump can deliver enough fuel to support a stage 2 k04 at 2000, 3000, 4000 etcrpm, which on stage 2 will produce more midrange and top end power than a k03 in any state of tune, so if it can support a k04 delivering more air everywhere than a K03 how can the same pump not support a K03 delivering less air and thus power and torque throughout the Rev range ?. As jay said he will have a pump producing say 50bar at 3000rpm but the tune will only ever need 30bar for example, which both the stock and updated pump can both deliver. So he's never going to demand more from a new pump than the stock one can produce. all be it on a minute scale a uprated pump will require more pumping force and therefore power from the engine via the camshaft. It will take more power to drive the uprated pump. Prob a negligible loss but we all know what difference turning on the air conditioning pump does to the mpg. But I don't see any reason to use engine power to pump fuel at a pressure you will never use, not to mention the cost of the pump.... :jumping:

Stooey:
Going by all this argument I gather t uprated clutch would be needed whether I have a loba hpfp or standard?

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