MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: Sammy on March 24, 2012, 10:51:53 pm
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From my understanding I take it the k04 turbo kicks in a little later but stays strong till later in the rpm then the k03s, at what revs do both turbos start kicking in?
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From memory, the K03 was about 1700 and the K04 around 2400.
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From memory, the K03 was about 1700 and the K04 around 2400.
Does that mean k03s has a better power output low down and the k04 slightly later? That also must mean the k04 is a better cruiser for the motorway as you can maintain the national limit and still not be in boost and therefore save fuel over the k03s too?
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The GTI had virtually no lag - at least that's what the press used to say at the time.
I've achieved 41-42mpg by having the car at 60mph constantly over a 150+ mile journey. I think at 70mph, the turbo has kicked in.
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Save fuel with a K04..... You must be joking!!
Ko4 spools up about 2500 and goes like a stabbed rat until 7000rpm, ko3 will tail off.
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Save fuel with a K04..... You must be joking!!
Ko4 spools up about 2500 and goes like a stabbed rat until 7
000rpm, ko3 will tail off.
:signLOL: so true
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Save fuel with a K04..... You must be joking!!
Ko4 spools up about 2500 and goes like a stabbed rat until 7000rpm, ko3 will tail off.
actually if you look at most graph of the K04 it loses breath from about 5200rpm upwards.
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fww160%2Fjakethemoss%2Frevo6.jpg&hash=14ab1d0614be6c2ff37d9920742b3278440f7b5b)
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The GTI had virtually no lag - at least that's what the press used to say at the time.
I've achieved 41-42mpg by having the car at 60mph constantly over a 150+ mile journey. I think at 70mph, the turbo has kicked in.
Is that with k04 you achieved that? Also is your gti standard?
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At a constant cruise @ 70 both engines will be pulling a vacuum.
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At a constant cruise @ 70 both engines will be pulling a vacuum.
Sorry what does pulling a vacuum mean?
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ED30. Stage 1. Similar figures when stock.
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At a constant cruise @ 70 both engines will be pulling a vacuum.
Sorry what does pulling a vacuum mean?
....In broad terms, vacuum relates to turbo pressure. The vacuum causes the turbo actuator to close and hence the turbo to work and give extra power. That's the simple explanation.
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Thanks for clearing that up Robin much clear understanding :smiley:
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Would a converted K04 spool up the same as a edition 30 or does that just depend on the map?
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My basic understanding of turbos is that the larger the impellor fan/wheel in the turbo the later it spools up, I cannot see ANY map changing the way a turbo spins up to speed to create boost, a map would only alter the amount of boost once its spooled up.
Correct me if im wrong :popcornsoda:
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At a constant cruise @ 70 both engines will be pulling a vacuum.
Sorry what does pulling a vacuum mean?
....In broad terms, vacuum relates to turbo pressure. The vacuum causes the turbo actuator to close and hence the turbo to work and give extra power. That's the simple explanation.
I don't get that. To me you are either on or off boost. At 70mph both turbos will be on boost.
Vacuum indicates a lack of pressure but if you do VCDS logs you see greater than atmospheric pressure when on boost. :rolleye:
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At a constant cruise @ 70 both engines will be pulling a vacuum.
Sorry what does pulling a vacuum mean?
....In broad terms, vacuum relates to turbo pressure. The vacuum causes the turbo actuator to close and hence the turbo to work and give extra power. That's the simple explanation.
I don't get that. To me you are either on or off boost. At 70mph both turbos will be on boost.
Vacuum indicates a lack of pressure but if you do VCDS logs you see greater than atmospheric pressure when on boost. :rolleye:
To clarify what I meant. When you're at low load on the motorway at a constant 70 (and low rates of accel) the engine is barely working (30-40 bhp maybe?); the throttle is only cracked open slightly, the inlet manifold is at less than atmospheric pressure and the turbo re-circ valve will be recirculating. There will be no boost as such.
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Pulling a vacuum can also mean this:
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At a constant cruise @ 70 both engines will be pulling a vacuum.
Sorry what does pulling a vacuum mean?
....In broad terms, vacuum relates to turbo pressure. The vacuum causes the turbo actuator to close and hence the turbo to work and give extra power. That's the simple explanation.
Not exactly.
Vacuum.
Pulling a vacuum basically means that the engines pistons are pulling or 'requesting' a greater volume of air than the turbo charger is giving. Thus resulting in negative pressure (vacuum) in the intake manifold.
Boost.
When to turbo spools and produces pressure in the intake system that is greater than the vacuum which the engines pistons are trying to make.... Then we have boost.... And smiles :-)