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d-shiznit Regular Location: W.A Registered: May 2004	Another turbo question Thu, 09 September 2004 10:05 I've been thinking about this for quite some time... Why is it that a turbocharged engine, when cruising (not accelerating), is not under boost? Eg. When accelerating to 100km/h boost is on, but when that speed is reached, and held at the same rpm, there is vacuum and not boost. I would think that an engine reving in neutral at say 4000rpm would produce the same amount of exhaust gases as an engine reving at 4000rpm under load.. Meaning the turbine should be spinning at the same speed for both cases. If this is true then the turbo should be providing boost all the time... except it doesn't when not under load! Can any enlightened person explain this? (so i can sleep at night) Thanks! Another example, in case I didn't explain it very well: When driving on a straight stretch at a constant speed, there is a vacuum in the inlet manifold, so no boost. However when the car starts to go up a hill, the turbo spools up, and u have boost! But this is all at the same rpm! So can anyone explain why this is so? [Report message to a moderator]

	Subject	Poster	Date
	Another turbo question	d-shiznit	Thu, 09 September 2004 10:05
	Re: Another turbo question	Cyber-punk	Thu, 09 September 2004 10:30
	Re: Another turbo question	Norbie	Thu, 09 September 2004 10:43
	Re: Another turbo question	d-shiznit	Thu, 09 September 2004 11:09
	Re: Another turbo question	Cyber-punk	Thu, 09 September 2004 10:47
	Re: Another turbo question	Cyber-punk	Thu, 09 September 2004 11:12
	Re: Another turbo question	d-shiznit	Thu, 09 September 2004 11:51
	Re: Another turbo question	d-shiznit	Thu, 09 September 2004 11:53
	Re: Another turbo question	thomasbl	Thu, 09 September 2004 12:39
	Re: Another turbo question	d-shiznit	Thu, 09 September 2004 12:53
	Re: Another turbo question	TA22-3SGTE	Thu, 09 September 2004 14:45
	Re: Another turbo question	d-shiznit	Fri, 10 September 2004 04:28
	Re: Another turbo question	Norbie	Thu, 09 September 2004 13:45
	Re: Another turbo question	Mx62	Thu, 09 September 2004 14:09
	Re: Another turbo question	pannelvan_screema	Thu, 09 September 2004 15:30
	Re: Another turbo question	stark	Thu, 09 September 2004 15:52
	Re: Another turbo question	Norbie	Fri, 10 September 2004 04:54
	Re: Another turbo question	d-shiznit	Sat, 11 September 2004 04:18

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