Relating vacuum reading with fuel economy?
#1
Supreme Member
Thread Starter
Join Date: Jul 2001
Location: Pueblo Co
Posts: 3,974
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1989 C4
Engine: L98
Transmission: 700r4
Axle/Gears: 307
Relating vacuum reading with fuel economy?
I'm just curious how to relate vacuum guage readings with fuel economy. From what Ive read you can use this guage to judge fuel economy and somehow translate these reading into MPG. My current normal driving measurement is 12in with the new cam and idles @ 15. I know the more vacuum the better economy but is there a straight line way to compare these readings with MPG?
12in =XX MPG.
Thanks!
Lol edited for brainfade.
12in =XX MPG.
Thanks!
Lol edited for brainfade.
Last edited by SSC; 05-03-2002 at 08:33 AM.
#2
Supreme Member
Join Date: Nov 1999
Location: NE
Posts: 2,860
Likes: 0
Received 2 Likes
on
2 Posts
Car: 82 camaro SC
Engine: 350
Transmission: 700r4
If you have 12/15 psi you must have a blower/turbo--it's giving boost at idle too. No accurate method of comparing vacuum with mileage. More vacuum does mean better mileage on the same engine though. Back in the day, some cars had 'economy' guages that showed when the engine was getting the best mileage. The idea was you could drive around trying to keep the guage as high as possible--maximum fuel economy. The guage was merely a vacuum guage.
#3
Supreme Member
Thread Starter
Join Date: Jul 2001
Location: Pueblo Co
Posts: 3,974
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1989 C4
Engine: L98
Transmission: 700r4
Axle/Gears: 307
Lol I need alot more sleep. IN not PSI.
I got interested in this when reading a Chiltons "55 Ways to inprove fuel economy." According to thier picture my vaccum readings indicate fair economy yet Ive had the guage on a couple of my cars and they all seem to run in the bottem "fair" area.
Thanks for the reply.
I got interested in this when reading a Chiltons "55 Ways to inprove fuel economy." According to thier picture my vaccum readings indicate fair economy yet Ive had the guage on a couple of my cars and they all seem to run in the bottem "fair" area.
Thanks for the reply.
Thread
Thread Starter
Forum
Replies
Last Post
colton_carlson
Firebirds for Sale
7
03-08-2019 12:21 PM
mdtoren
Tech / General Engine
0
08-16-2015 05:45 PM