vacuum gauge - TriStateTuners.com :: Home of Tristate Auto Enthusiast

Willdue · 04-02-2007, 07:05 PM

I installed a vacuum gauge, what should it be set at when at idle? And wot?

Evo8kid · 04-02-2007, 10:41 PM

well idle varies from type of cars..im gonna take a long shot and say like 80hg? WOT should be 0 cause your not running and type of FI. Some one correct me if im wrong

Keyan · 04-03-2007, 08:31 AM

A simple way to answer your question would be to quickly state what a vacuum gauge does: It reads the vacuum created by the pistons in the intake manifold. The throttle plate generates the vacuum because it trys to keep air from getting in. So, in theory, at WOT, the vacuum gauge should read very little to 0 inches of mercury, and at idle, it should read 16-20 depending on your compression of the motor, and if you blip the throttle at idle it should spike to 22, maybe 24 for a brief moment. On a boosted car, obviously, at WOT it would move above 0 inches of mercury into the pounds per square inch range

04-02-2007, 07:05 PM	#1
Willdue Tri-State Post Whore Join Date: Jun 2006 Location: Catasaqua Member #2000 My Ride: To many VW's iTrader: (3)	vacuum gauge I installed a vacuum gauge, what should it be set at when at idle? And wot? __________________ Mark IV. Wayyy out there.

04-02-2007, 10:41 PM	#2
Evo8kid Tri-State Post Whore Join Date: Mar 2006 Location: Newtown, PA Member #1631 My Ride: contributes towards Global warming iTrader: (0)	well idle varies from type of cars..im gonna take a long shot and say like 80hg? WOT should be 0 cause your not running and type of FI. Some one correct me if im wrong __________________ TurboTagTeam is my crew chief 1996 Nissan 240sx- To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures. 2010 Dodge Ram 2500 6.7L Turbo Diesel 2008 Audi RS4- 420 HP 4.2L V8 2004 Honda CBR600RR

04-03-2007, 08:31 AM	#3
Keyan Tri-State Aficionado Join Date: Mar 2006 Location: Sparta, NJ Member #1577 My Ride: 1993 3000GT VR-4 iTrader: (0)	A simple way to answer your question would be to quickly state what a vacuum gauge does: It reads the vacuum created by the pistons in the intake manifold. The throttle plate generates the vacuum because it trys to keep air from getting in. So, in theory, at WOT, the vacuum gauge should read very little to 0 inches of mercury, and at idle, it should read 16-20 depending on your compression of the motor, and if you blip the throttle at idle it should spike to 22, maybe 24 for a brief moment. On a boosted car, obviously, at WOT it would move above 0 inches of mercury into the pounds per square inch range Last edited by Keyan; 04-03-2007 at 08:34 AM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Help With Vacuum Gage	Mr.2jz-GE	Exterior, Interior, and Electrical	9	07-29-2010 04:14 PM
For those who want a dyson vacuum	igo4bmx	Off-Topic	9	12-18-2008 10:34 AM
Vacuum leak! Help!	D Money	Subaru Talk	22	03-13-2008 12:48 AM
RC Vacuum Car	Spocknasty	Off-Topic	2	04-02-2007 12:36 AM