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What is the deal with Vacuum reading ??

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07-10-2016, 04:11 PM

#21 (permalink)

ksa8907

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Originally Posted by ST2008

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OK, but why some state that we should keep vacuum as higher as much possible in order to have higher mpg.

For myself, the vacuum shows in Torque pro are 21psi for idling and 8 to 12psi for driving in a freeway (60mph). And I have no clue how to control the vacuum.

I also use torque pro. It seems to incorrectly use psi instead of inches of mercury when displayi g vacuum. The 21 psi you see is actually 21 inches of vacuum.

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07-10-2016, 04:24 PM	#22 (permalink)
oil pan 4 Corporate imperialist Join Date: Jul 2011 Location: NewMexico (USA) Posts: 11,185 Sub - '84 Chevy Diesel Suburban C10 SUV 90 day: 19.5 mpg (US) camaro - '85 Chevy Camaro Z28 Riot - '03 Kia Rio POS Team Hyundai 90 day: 30.21 mpg (US) Bug - '01 VW Beetle GLSturbo 90 day: 26.43 mpg (US) Sub2500 - '86 GMC Suburban C2500 90 day: 11.95 mpg (US) Snow flake - '11 Nissan Leaf SL SUV 90 day: 141.63 mpg (US) Thanks: 270 Thanked 3,528 Times in 2,802 Posts	That BMW engine still suffers from isobaric losses like every engine with a throttle. __________________ 1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost. 1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end. 2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.

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07-10-2016, 04:53 PM

#23 (permalink)

ST2008

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Quote:

Originally Posted by ksa8907

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I also use torque pro. It seems to incorrectly use psi instead of inches of mercury when displayi g vacuum. The 21 psi you see is actually 21 inches of vacuum.

Ok thanks. it's good to know.

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07-11-2016, 08:41 AM	#24 (permalink)
elhigh Master Novice Join Date: Jan 2008 Location: SE USA - East Tennessee Posts: 2,314 Josie - '87 Toyota Pickup 90 day: 29.5 mpg (US) Felicia - '09 Toyota Prius Base 90 day: 50.48 mpg (US) Thanks: 427 Thanked 616 Times in 450 Posts	21 PSI would be some monster boost! __________________ Lead or follow. Either is fine.

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