Fantastic fuel economy increase! - SaabCentral Forums
*
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum


Go Back   SaabCentral Forums > Saab C900, 1979-1993 & '94 Convertible (C=classic) > C900 Workshop

C900 Workshop Classic 900 (1979-1993 & '94 Convertible) Technical Forum.

SaabCentral.com is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 19th April 2006
Daniel's Avatar
Daniel Daniel is offline
SaabNut!
 
Join Date: Feb 2004                                                
Location: Cheltenham, Glos.
My Saabs: Classic 900 LPT/93 Sportwagon TTiD
Posts: 281
Default Fantastic fuel economy increase!

I've been registering the MPG's for about the past 6 months. It's beed steadily increasing after various adjustments etc. : adjusting AMM, new plugs/leads and dizzy. New lambda/reset ECU and inflate tyres! It started at 20/22mpg and I got it to 24/26. (averaged, including all types of driving and conditions).
I decided to have the timing checked and it was out by 3 degress. At the same time as doing this I fitted a new 82 degree thermostat. The car was taking ages to reach op temp and I suspected it was holding the car on choke for too long.
The MPG's have jumped to 28/33! I'm getting 28 around town and 32/33 on the motorway.
Just a heads up really: if you're having poor economy and you've exhausted most other things, try the thermo and timing!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 19th April 2006
unkleG'sif's Avatar
unkleG'sif unkleG'sif is offline
Saab Lunatic
 
Join Date: Sep 2004                                                
Location: Liverpool, UK
My Saabs: 1993 T16 (xLPT) - 1994 RUBY!!!
Posts: 3,470
Default

superb


guess i'll have to look at the same
cheers daniel

g
__________________
"we can allow satellites, planets, suns, universe, nay whole systems of universe[s,] to be governed by laws, but the smallest insect, we wish to be created at once by special act" - Charles Darwin


http://www.nicecupofteaandasitdown.com/

http://www.saabcentral.com/phpgallery/Gs-little-Saab
Reply With Quote Quick reply to this message
  #3  
Old 19th April 2006
SteveTheFolkie's Avatar
SteveTheFolkie SteveTheFolkie is offline
Saab Lunatic
 
Join Date: Jan 2006                                                
Location: Pennsylvania, USA
My Saabs: 1987 900 8V
Posts: 4,078
Default

great job! Some people have seemed astounded by my mileage (32-33 MPG) but I attribute it to keeping my car in a good state of tune, clean air filter, clean oil (and I don't go gonzo on viscosity) and keeping the tires aired up - amazing how many people are running around with a dirty air filter, poor lubrication, low tire pressuer with a bad running engine who complain about the lousy mileage they get.
Reply With Quote Quick reply to this message
  #4  
Old 19th April 2006
Matt88S's Avatar
Matt88S Matt88S is offline
Saab on the Brain!
 
Join Date: Aug 2004                                                
Location: Oklahoma, USA
My Saabs: 87&88S,88T,91TVert, 90 Talladega Red SPG
Posts: 5,464
Default

Not to spoil you good mood or anything but Summer fuel mix might also have something to do with it, you tend to slightly better milage on it. I went from about 28 mpg to 25 mpg when they switched from summer to winter and I've notice in the last month or so I've went back up to 28 mpg. I've forgotten exactly when they switch over but its a theory
Reply With Quote Quick reply to this message
  #5  
Old 19th April 2006
SteveTheFolkie's Avatar
SteveTheFolkie SteveTheFolkie is offline
Saab Lunatic
 
Join Date: Jan 2006                                                
Location: Pennsylvania, USA
My Saabs: 1987 900 8V
Posts: 4,078
Default

Quote:
Originally Posted by Matt88S
Not to spoil you good mood or anything but Summer fuel mix might also have something to do with it, you tend to slightly better milage on it. I went from about 28 mpg to 25 mpg when they switched from summer to winter and I've notice in the last month or so I've went back up to 28 mpg. I've forgotten exactly when they switch over but its a theory
You could also take atmospheric conditions into account since warmer air is less dense and would provide less resistance, colder temperatures keep the enrichment circut open longer, the alternator is working harder (lights, wipers, heater blower motor, heated seats) and people tend to idle longer to let the car warm up, plus our cold lubricants provide more resistance until they're up to speed - and the winter fuel change over is a possibility - but mine was consistent through the winter (and we do use winter formulations in this part of PA) - you still can't beat a good tuneup, clean filters and correctly inflated tires -

Last edited by SteveTheFolkie; 19th April 2006 at 10:14 AM. Reason: just a gump day
Reply With Quote Quick reply to this message
  #6  
Old 20th April 2006
16saabs 16saabs is offline
Saab on the Brain!
 
Join Date: Jan 2005                                                
Location: fakenham
My Saabs: 2x LPT convertible's, 1 x 900 SE
Posts: 5,776
Default

as others before have said, keep all your electrics newish and clean, good filters and oil, and timing. the only time i get below 31(norm 32-33 al seasons) is when i drive the wife's vert auto 25-27
Reply With Quote Quick reply to this message
  #7  
Old 20th April 2006
PianoDavid's Avatar
PianoDavid PianoDavid is offline
SaabNut!
 
Join Date: Sep 2005                                                
Location: Santa Barbara/Los Angeles, California, USA
My Saabs: 1988 900 16v Turbo 3Dr auto.
Posts: 411
Default

ive heard about ignition timing but i have noooo idea how to check it. some kind of light needed?? plz help... im getting 20 and i WAS getting 25 before my new AMM was installed (i guess my older one was running lean?)
Reply With Quote Quick reply to this message
  #8  
Old 21st April 2006
SteveTheFolkie's Avatar
SteveTheFolkie SteveTheFolkie is offline
Saab Lunatic
 
Join Date: Jan 2006                                                
Location: Pennsylvania, USA
My Saabs: 1987 900 8V
Posts: 4,078
Default

Quote:
Originally Posted by PianoDavid
ive heard about ignition timing but i have noooo idea how to check it. some kind of light needed?? plz help... im getting 20 and i WAS getting 25 before my new AMM was installed (i guess my older one was running lean?)
You'll need a timing light (connects to your battery and the spark plug on the #1 cylinder) and a wrench (that fits the fixing bolt on your distributor) - with the engine at idle you aim the timing light at the timing mark (should be adjacent to the flywheel) - and adjust the distributors position - by turning - until the mark on the flywheel (which will be illuminated as the strobe light in the timing light is activated by the ignition pulse from the #1 cylinder) is aligned with the timing scale mark that is required - you then tighten the bolt holding the distributor and re-check the timing (to make sure you didn't move the distributor by accident) - if you have a vacuum advance can on the disty you typically remove the hose and plug it before timing the vehicle -
That's about it - what it does is ensure that the spark plug fires at the correct moment in time to ensure the best burn of the fuel in the combustion chamber - if it's retarded (happening to late - not acting dumb) you'll get lousy performance and poor mileage - if it's advanced you'll get detonation - if it's WAY off the car won't start -

Steve

(next lesson we can discuss setting the gap and dwell on your new distributor points!)
Reply With Quote Quick reply to this message
  #9  
Old 21st April 2006
SAABurban's Avatar
SAABurban SAABurban is offline
Active Member
 
Join Date: Jan 2005                                                
Location: extreme northeast GA u.s.a.
Posts: 81
Default

I love the fuel econ on my 93'. She is getting consistantly, 31-33 mpg. Fixing the leaky fuel bib with all of it's cracks has really made the difference.

Oh yeah, keeping the steel toe's from becoming wedged at the knee bolsters also worked wonders
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:26 AM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.

top of page | sitemap | email us



copyright © 2003 - 2011 saabcentral.com, All rights reserved http://www.whiter.co.uk - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.