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Posted by: johannes Aug 18 2006, 04:11 PM

Just found some interresting facts in a vintage french magazine.

Test was made in January 1970 by a french magazine

Porsche 914/4 1.7 80 HP DIN at 4900 (85 HP SAE at 5000)

Test was made at Montlhery ring ( near Paris) by a cold day (6 °C / 42.8 F )
Driver alone

Targa ON / lights OFF max speed 167.4 kmh (104 mph)
Targa ON / lights ON max speed 164.9 kmh (102.5 mph)
Targa OFF / lights OFF max speed 163.8 kmh (101.8 mph)
Targa OFF / lights ON max speed 161.5 kmh (100.4 mph)

Conclusion:

At theese speeds, with this temperature and the targa OFF you better wear a thick coat and gloves ...

Posted by: So.Cal.914 Aug 18 2006, 04:20 PM

What was the speed with the:

TARGA OFF / LIGHTS ON AND TIRES FLAT.

Posted by: johannes Aug 18 2006, 04:30 PM

Tires seemed OK on the picture ...


Attached image(s)

Posted by: Brett W Aug 18 2006, 05:21 PM

How do jackstands affect top speed?

Posted by: michel richard Aug 18 2006, 05:25 PM

Johannes,

Merci,

Very interesting information. Anybody out there able to translate this data into drag coefficients ?

Michel

Posted by: michel richard Aug 18 2006, 05:26 PM

Johannes,

Can you scan and upload the article ?

Michel

Posted by: Joe Ricard Aug 18 2006, 05:30 PM

Cool, I got some genious co-workers maybe next week.

But that's logical about the results.

I must be making mad power and a bit more aero stuff. I can accelerate pretty good even from 100 MPH.

Seems to hit the aero wall about 117 - 120 range.

I notice differences in head temps with top off windows down too. Maybe I need "air tabs"

Posted by: johannes Aug 19 2006, 01:45 AM

Its 10 pages of very small printed text ... Its also larger than my scanner ... and all in french ... I am afraid I won't upload that ...

Posted by: Gary Aug 19 2006, 07:38 AM

http://www.914world.com/bbs2/index.php?showtopic=51962