1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Project Hypermile

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Old Aug 28, 2008 | 10:01 PM
  #51  
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From: MontCo, MD (Speed Cameras FTL)
Originally Posted by gsl-se addict
This is a myth.

1. anything more than about 3ft below ground level, the temperature is almost constant. Doesn't matter what the outside air temperature is.

2. those tanks hold a tremendous amount of fuel. It would take a ton of energy to even move the temperature 1 degree

3. The gas pumps report gallons, but the fuel is really measured on a mass basis (density compensated flowrate).

Here is what Omega says:



http://www.omega.com/techref/flowmetertutorial.html
There's gas caught in the lines which are not buried in the ground. They are insulated but they will acquire some temperature. I won't deny that the difference is slight (hence the italics) - it might only be a drop.

The density compensated flowmeters is something I didn't know though, so if that's correct you'd pay the same one way or the other, just get a little more into the tank.
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Old Aug 29, 2008 | 12:55 AM
  #52  
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Well i haven't started doing the hypermile method yet, but today i filled up after driving about 230km i used up about 33L of fuel, bringing me to about 16.45 mpg this is with quite a bit of spirited driving, on a street port i would say this isn't too bad as it stands right now. I'm going to try my best for this next little while to stay off the gas as much as possible to find out what it can really do. I'm not going to start off anything insane yet, but basically just staying under say 3500 rpm.
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Old Aug 29, 2008 | 01:12 AM
  #53  
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I got 23.4 mpg just by driving carefully harder. I went fast, but never above 4,000 RPM (except a few times).
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Old Aug 29, 2008 | 04:38 PM
  #54  
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From: Huntsville AL
UPDATE:

Today I drove around for ***** and giggles. Honestly, this is kind of fun. I'm not going to drive like this as long as I own the car though. That would be horrible. Anyways, I racked up some good miles today, so far there is 49 on the dot.



Tire pressures all 40PSI

The weather right now is 88*f, partly cloudy.

Gauge shot for the day:
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Old Aug 29, 2008 | 06:34 PM
  #55  
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From: MontCo, MD (Speed Cameras FTL)
Disconnect your indicator lights, they're using too much power in those gauge shots
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Old Aug 29, 2008 | 07:16 PM
  #56  
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Originally Posted by trochoid
2 items of advice. 1. Always fill up at the same spot for consistency. 2. The 2nd gens have a little light in the cluster that comes on when it's time to upshift for the best fuel mileage. This is of course, load dependent. In general, the light comes on between 1500-2000 rpm. Happy trails with your test.
My FC's shift light usually came on between 2800 and 3500 rpm, load dependant.
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Old Aug 29, 2008 | 07:21 PM
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i added some gas today and as i did i was like "hmm..hypermile..." so i did it all day, drove around to my jiu-jitsu, and around town for a few errands and what not, no keeping record tho :P, but i was just doing it for ***** and giggles, and i gotta say, i have a headache and my right foot is actually tired, it takes quite a bit of concentration, but it saved me from 2 possible wrecks lol.
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Old Aug 30, 2008 | 10:56 AM
  #58  
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From: Huntsville AL
Originally Posted by blackdeath647
i added some gas today and as i did i was like "hmm..hypermile..." so i did it all day, drove around to my jiu-jitsu, and around town for a few errands and what not, no keeping record tho :P, but i was just doing it for ***** and giggles, and i gotta say, i have a headache and my right foot is actually tired, it takes quite a bit of concentration, but it saved me from 2 possible wrecks lol.
Its rough man. Lol, I would much rather be driving WOT on track than using my big toe on the street.

Also, I forgot to mention on the last update. I was stuck in traffic for about 5-8 minutes, and short shifting at 2k rpm, and sitting, the carb didn't like. It started to load up, so I waited and got about 40 feet behind the guy in front, and cruised up to him in first @ 2500rpm. Still kept the RPMs low, but cleared most of the loading issue.
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Old Aug 30, 2008 | 10:57 AM
  #59  
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Originally Posted by Joker1337
Disconnect your indicator lights, they're using too much power in those gauge shots
My engine operates best at 0 rpm.
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Old Sep 6, 2008 | 04:52 PM
  #60  
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Page 3 bump!

Went on a drive today in the country, took the back roads.





Just cruised around, doin about 45 in a 55 the whole time.

Here is the stats so far:
All tires at 40, but rear passenger was at 38. Starting to think it has a leak on the valve stem or something.

89*F right now.

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Old Sep 6, 2008 | 04:53 PM
  #61  
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It is about 1 needle below 3/4 tank, 124.4 miles on it so far!
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Old Sep 7, 2008 | 09:23 PM
  #62  
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Thats purdy country roads. man at 124 miles my 7 is at about 1/4 tank!!!
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Old Sep 7, 2008 | 11:23 PM
  #63  
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Thanks. It took me like 45 minutes to get to that road, then I was on it for about 20 minutes

lots of 35-45mph stop and go roads to get there and leaving there. when I got to that road, I stayed no more than 45. That way it can't be ruled as a highway run. Even had 4 stop signs I had to stop at.
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Old Sep 14, 2008 | 02:59 PM
  #64  
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Another update. Went driving around today.

Same tire pressures, 88*F outside. Man, I know if it was just a little cooler, I might squeeze another mpg out of her.

So far, 161 miles, still above half tank
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Old Sep 14, 2008 | 03:00 PM
  #65  
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Also went to check the plugs, seein how they are doing.

Forgot that I was running 2nd gen leading plugs.

Trailing #1


Trailing #2


Leading #1


Leading #2
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Old Sep 14, 2008 | 09:14 PM
  #66  
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Daaaam that's ALOT of milage... 161 and still above half a tank..?? My needle would be below 1/4 of a tank at that milage for sure...???
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Old Sep 14, 2008 | 10:09 PM
  #67  
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Originally Posted by 85TIIDEVIL
Daaaam that's ALOT of milage... 161 and still above half a tank..?? My needle would be below 1/4 of a tank at that milage for sure...???
Yep! I love the mileage, but hate driving like this. Maybe if I mix it up a bit, it will improve, and still be a little fun.

I measure and take pictures at the same spot, inside the garage.
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Old Sep 14, 2008 | 11:04 PM
  #68  
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i admire you for doing this but i cant do it in any vehicle i drive hahaha. global warming and empty pockets ftw
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Old Sep 15, 2008 | 12:15 AM
  #69  
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car seems like its running on the rich side there looking at those plugs.
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Old Sep 15, 2008 | 12:23 AM
  #70  
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Originally Posted by dj55b
car seems like its running on the rich side there looking at those plugs.
I know. I hear that with a freer flowing exhaust (with a stripped carb) it tends to run lean on the high end too. Plugs are still out of the car, I may douse them in carb cleaner and hit them with the brass brush tomorrow. If I do... updates
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Old Sep 15, 2008 | 12:42 AM
  #71  
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that would kill me having to drive like that
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Old Sep 15, 2008 | 01:11 AM
  #72  
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Originally Posted by brad horton
that would kill me having to drive like that
Makes 2 of us. Today I got a little "sporty" and got it up to 2500rpms in 2nd :O

I shift at 2k and feather it always, but I miss it soooo bad.
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Old Sep 15, 2008 | 01:13 AM
  #73  
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Now, I will fill up when it reaches this mark, as was the last time I filled up. Trying to make it consistent.


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Old Sep 18, 2008 | 02:52 PM
  #74  
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Well, broke 200 miles today. Not as hot as usual, the weather still says it is about 79*F. Getting cooler, so better gas mileage should be around the corner.

Pumped the tires back to 40PSI, they all were down about 1PSI.

Did more "city" driving, as I had to run to the courthouse again today. Nothin like 3rd gear 20mph max. Light traffic, would say I was stationary for about 10 minutes total.


Here is the screenshot today:


I parked facing the garage door today, as opposed to just pulling straight in. Not sure if there was a difference in the gas angle...
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Old Sep 18, 2008 | 08:19 PM
  #75  
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Wow, at 200 is when i usually fill up. lol though i dont know how much a can squeeze out of a full tank. Partly due to a faulty gas gauge
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