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ke382TG Forums Junkie Registered: May 2002	Re: Boost Changing Fri, 13 August 2004 00:55 To throw another idea in. In my case I could hold 18psi in first, 18 psi in second, then it would start at 18psi in third and immediately drop to 12psi then 4th gear was the same as third and 5th was the same and so on. Problem was that the wastegate flap was being forced open by the exhaust gases and hence the boost drop. It was only noticed in the taller gears because of the increased torque loading (more exhaust gas trying to bypass the wastegate flap) and longer time spent in those gears. Increased tension on the wastegate actuator fixed the problem perfectly! Your prob could be this but sounds much more like it is simply a bleed valve that needs to be better setup/located. Ensure that the wastegate actuator line is as short as possible i.e. it should ideally be from the wastegate actuator to the compressor housing (or to the first few inches of piping immediately after the compressor housing) the shorter this line is the less spiking and more stable the boost. If your wastegate line runs from the manifold the the wastegate actuator then this will almost definitely be your problem. Locate your bleed valve close to the wastegate actuator and ensure that there is a restrictor in the line before the bleed!! Otherwise you will be bleeding off a shite load of air and not gaining much boost or getting very good boost control. If a bleed valve can't bleed enough then you will see low boost (because more positive pressure is able to force the wastegate actuator to open the wastegate flap). It sounds like yours can bleed off enough for around 9 - 10 psi but it spikes to 13 psi due to the delayed reaction of wastegate actuator then settles down to the boost level that the bleed valve can maintain. I am assuming the bleed valve you made has no "gate" either? A spike of a pound or so is not much to worry about, in fact some people like a spike to give a bit of oomph at the start as it comes on boost. I have mine setup (4AGTE) to run a low boost of 13 psi and it does not spike or drop or flutcuate at all (no gate on the low boost). High boost (19psi usually) is gated and comes on with a 1psi spike (can be set up to spike higher or not at all too) then holds the preset boost perfectly! Hope this helps. [Report message to a moderator]

	Subject	Poster	Date
	Boost Changing	adavy84	Thu, 12 August 2004 08:39
	Re: Boost Changing	doityourself	Thu, 12 August 2004 09:02
	Re: Boost Changing	doityourself	Thu, 12 August 2004 09:10
	Re: Boost Changing	Norbie	Thu, 12 August 2004 23:31
	Re: Boost Changing	adavy84	Thu, 12 August 2004 12:33
	Re: Boost Changing	YelloRolla	Thu, 12 August 2004 13:39
	Re: Boost Changing	BLK1GGTE	Thu, 12 August 2004 14:03
	Re: Boost Changing	ke382TG	Fri, 13 August 2004 00:55
	Re: Boost Changing	adavy84	Fri, 13 August 2004 03:11
	Re: Boost Changing	ke382TG	Fri, 13 August 2004 03:45
	Re: Boost Changing	adavy84	Sat, 14 August 2004 05:06
	Re: Boost Changing	adavy84	Sun, 15 August 2004 10:55

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