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Old 09-29-2019, 02:58 AM   #1
WontonNoodle
Scooby Newbie
 
Member#: 478520
Join Date: Nov 2017
Chapter/Region: International
Vehicle:
2005 WRX
Platinum silver metallic

Default Vacuum pressure while cruising at 70mph?

05 wrx got onto the high way got a check engine light and noticed negative vacuum pressure seemed higher than regular with cruise on set at around 70mph. Would almost make 5psi of boost on the slightest incline. Vacuum at idle is around -21 like itís always been. No code shows up with a obd2 scanner.
Anyone know what you get for vacuum pressure with cruise set at 70?
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Old 10-03-2019, 03:44 AM   #2
SlammedSix
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Member#: 419926
Join Date: Apr 2015
Location: 06 FXT/08 STi/04 WRX/17 Outbac
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"Vacuum at cruise at 70" is irrelevant. Vacuum is dependent on load. So 70 mph on downhill slant will have say 25-30 inch vacuum, 70 mph on flat road could be 10 inch vacuum, 70 mph on uphill could be 5 lbs boost.
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Old 10-03-2019, 08:56 AM   #3
rtv900
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Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:
2016 STI

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Quote:
Originally Posted by SlammedSix View Post
"Vacuum at cruise at 70" is irrelevant. Vacuum is dependent on load. So 70 mph on downhill slant will have say 25-30 inch vacuum, 70 mph on flat road could be 10 inch vacuum, 70 mph on uphill could be 5 lbs boost.
correct here^
nobody can answer that without knowing what load you are at
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