No boost while in park or neutral

adamh88 · 04-08-2006, 12:07 AM

This is probably a really stupid question but I know little about turbos. Anyway i have an 88 turbo with an auto and the turbo only spools up if im moving and damn near floored and it still kinda lags. I was wondering if its supposed to be like this or if my vaccuum lines are all wrong or what? also i cant seem to find a vaccuum diagram because the one on my hood is worn off and the haynes manual sucks any sugguestions would help Thanx

ddmcse · 04-08-2006, 02:47 AM

you should be able to find one here

http://www.cygnusx1.net/supra/librar...ndex_tool.html

adamh88 · 04-08-2006, 06:35 AM

thanx alot just by looking at it i can tell mine is way off and it looks like the vsv has a broken nipple or two im gonna look at it more during the day tomarrow what is the vsv and is it nessecary?

adamh88 · 04-09-2006, 03:35 AM

Ok a friend of mine told me turboed automatics arent supposed to make boost when in park or neutral is this true or what?

the_fallen · 04-09-2006, 03:44 AM

turbo's need load to be able to actually work, just free revving doesn't do this. on a stock engine, you shouldn't see any boost, and on worked engines only a couple of psi at the most

ddmcse · 04-09-2006, 11:54 AM

thats not just for automatics

04-08-2006, 12:07 AM	#1
adamh88 Stock Join Date: Jan 2006 Location: Phoenix, Arizona Posts: 22	No boost while in park or neutral This is probably a really stupid question but I know little about turbos. Anyway i have an 88 turbo with an auto and the turbo only spools up if im moving and damn near floored and it still kinda lags. I was wondering if its supposed to be like this or if my vaccuum lines are all wrong or what? also i cant seem to find a vaccuum diagram because the one on my hood is worn off and the haynes manual sucks any sugguestions would help Thanx

04-08-2006, 02:47 AM	#2
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	you should be able to find one here http://www.cygnusx1.net/supra/librar...ndex_tool.html __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS

04-09-2006, 11:54 AM	#6
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	thats not just for automatics __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS

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04-08-2006, 06:35 AM	#3
adamh88 Stock Join Date: Jan 2006 Location: Phoenix, Arizona Posts: 22	thanx alot just by looking at it i can tell mine is way off and it looks like the vsv has a broken nipple or two im gonna look at it more during the day tomarrow what is the vsv and is it nessecary?

04-09-2006, 03:35 AM	#4
adamh88 Stock Join Date: Jan 2006 Location: Phoenix, Arizona Posts: 22	Ok a friend of mine told me turboed automatics arent supposed to make boost when in park or neutral is this true or what?

04-09-2006, 03:44 AM	#5
the_fallen 3" Exhaust Join Date: Nov 2004 Posts: 81	turbo's need load to be able to actually work, just free revving doesn't do this. on a stock engine, you shouldn't see any boost, and on worked engines only a couple of psi at the most