924Board.org

[xr4outcast]

Just like the title says, what kind of gas mileage does the good old 931 get?
I am just curious how good the CIS is compared to EFI.
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So many cars so little time.

[nwns]

About 25mpg for an S1, 30+ for an S2
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Pete

[xr4outcast]

So an 82' with a 327 ratio out of a 1986 951 should get 30+?

Thats my goal for now is something fun to drive with better then 25mpg.
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So many cars so little time.

[Khal]

Mine rarely went as high as 25mpg and was more commonly around 22mpg. Of course it's totally dependent on where and how you're driving, beautifully illustrated in a Top Gear episode where a Toyota Prius driven flat-out got worse fuel economy than a BMW M3 at the same pace. Don't be fooled into believing that the theoretical best fuel economy the car is capable of will be what you always get. It won't.

Also, be aware that U.K. gallon is larger than a U.S. gallon, so fuel consumption numbers are not directly comparable. You need to do a conversion.
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'80 924 Turbo

[flosho]

I would say about 15 average, but that just could be my driving style too...
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[This Space For Rent]

[morghen]

8L/100Km driving on the autobahn or on national roads.
15-20l/100Km driving in the city.
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Supercharger and EFI kits
https://www.the924.com

[Khal]

And perhaps to help all these numbers make some sense;

8 litres per 100 kilometres is near enough 30 miles per gallon in the U.S. and near enough 35 miles per gallon in the U.K.

I very much doubt a 924 Turbo, driven as one normally drives a 924 Turbo, would get those kind of numbers anywhere except on a very straight, flat highway at a very constant speed.

Get heavy on the loud pedal (as if you wouldn't, it's a turbocharged Porsche...) and these things can drink dino juice at a pretty impressive rate. Maybe not in the same league as a 454 at full noise, but impressive nonetheless.
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'80 924 Turbo

[Rasta Monsta]

Mine seems to operate at high RPMs/WOT quite a bit. The mileage is not that great.
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Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[morghen]

[Raceboy]

With my turbocharged and EFI'ed 924 I get around 7-8 l/100 km when driving at the highway around 100-110 kph and few passings.

Can't see how would CIS equipped 931 get anywhere near those figures, my 924 with CIS got around 9l /100 km fuel mileage.
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

[morghen]

The manual says ~6.6L/100km at 90km/h and 8.1L driving at 120km/h for the NA and slightly BETTER for the turbo.

i've done two ~4000km trips with it and a few 500-1000 trips. ofcourse the longer trips got me better mileage...but its still well under 9L/100km

I stand by my affirmation, if tuned well these cars will do what the manual says they do.
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Supercharger and EFI kits
https://www.the924.com

[nwns]

Is yours an S2 Morghen?
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Pete

[Cedric]

Figures like 8l/100km is absolutely reachable in an s2 driving carefully on the highway. I have never had the patience to drive my 931 slow enough to get good figures, at about 135km/h GPS its about 9l/100km (feels like the consumption got worse on the highway with the change to s1 turbo on the s2 engine). At the track something like 35l/100km

With a low power Us version this should easily be reachable.

My n/a did 7.3/100 doing about 130 on the speedo for 6 hours.
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1980 924 Turbo
www.instagram.com/garagecedric/

[morghen]

yes, mine is an S2.
Cédric, believe me, when you drive for 8-12 hours on the highways you get tired of speeding and just cruise and enjoy the ride
_________________
Supercharger and EFI kits
https://www.the924.com

[nwns]

The S2 is much more economical when driven in a less agressive manner owing to the DITC
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Pete