924Board.org

[CV924]

I'm averaging 20 mpg in my 78 924 N/A 4 speed. Just curious to know if others are averaging the same or better. Do I need a tune up to improve the gas mileage?
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'78 924 N/A
w/30k Orig Miles

[AppleBit]

if your getting 20 mpg then you need some sort of tune up. I used to get 30 + mpg with my 924 when it was stock.
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Classic British Sports Car Restoration v6 + v8 Engine Conversion Swaps

Porsche 924 Wide Body LS1 Corvette 500 Horsepower Engine

[Ozzie]

I'm getting about 30mpg with mine and about 25 around town.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[5150]

My euro is getting about the same as the others, low 30mpg's on the open road driven normally, mid 20's around the doors, low 20's if I'm really ripping things up.
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Mars Red '78 Euro 924 n/a
http://www.cardomain.com/id/5150_uk

Graphite? Grey Metallic '85 (late model) 944 2.5

There are two kinds of pedestrians: the quick and the dead.

[rcoble]

I'm only getting 18mpg with easy driving. I think its tuned well, and I have gone over allmost every componet and re-built or replaced each. No smoke or residue, no rough running, actually very happy with the performance. Just what would be the likley cause of poor fuel economy. I do run an air-fuel gauge and a fuel pressure gauge and both seem to be reading correctly.
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78-924 red , my first real car at age 44.
80-928 black, bought from turbo924.
83-928 black, My current effort.

[AppleBit]

[Ozzie]

Is your thermostat operating at the correct temp.
Spark plugs correct type and heat range.
Fuel mixture correct?
Vacuum lines all ok- including breather to crank?
Idle set to specs?
I get the mpg you describe in my work truck.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[rcoble]

Thermostat is operating at the correct temp.
Spark plugs are correct type and heat range.
Spent a lot of time on Fuel mixture and timing etc. have gone through this over and over and every time it works out to the same settings. I'm 100% confident that it is correct.
Replaced all vacuum lines even the ones through the firewall. I don't really understand why the crank breather hose would affect gas mileage.
Idle is set to specs.
I agree the mileage is bad and I am at a loss as to why, especially since it seems to burn clean and run nice.
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78-924 red , my first real car at age 44.
80-928 black, bought from turbo924.
83-928 black, My current effort.

[Ozzie]

Depending on line setup the crank breather is connected to either the air box or between the boots to the throttle body.
It effects O2, performance and emissions and if connected to the boots- vacuum.
It should have a restrictor in the 3/4 hose to reduce the volume drawn from the crank.
This restrictor can be missing or blocked, hose cracked or broken.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[Joes924Racer]

Wonder what a 76 944 gets for mileage. Saw a nice one the other day
with nice chrome rims with the flat style center caps the big ones that sit inset a litle.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

[Khal]

[Joes924Racer]

I know .. I meant 86-87.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.