What would be the difference between a 911 turbo and a 930 turbo??

I went to the nadaguides website and I noticed on the early cars starting in 77 they list a 911 turbo and a 930 carrera. What would be the difference in these cars?? what does the 930 have that the 911 turbo doesnt?? Thanx in advance

This is better explained in Bruce Anderson's book, but in the early years, Porsche's internal number for the turbo was 930. At some point, they started calling it a 911 turbo. I believe the 1976, 3.0 liter, non-intercooler car was indeed called the 930 turbo carrera.

I may be wrong, but I believe that Porsche ended the 930 designation when they resumed U.S. turbo production in 1986. After that, it was just labeled the 911 turbo.

-EJ

This may help or confuse things? Our 1987 owners manual is labeled 911 Turbo/911 Carerra and the engine is refered to as a type 930-68 which means it is a type 930 and the 68 is for USA sale. The CA emissions test centers call it a 911 Turbo Carerra which is what pops up when the serial number is entered? 930 originally came from the type number that was made for homoligation when the factory wanted to race it. 934 was the 930 for group 4 and 935 was the 930 for group 5 racing.

The turbo version of the 911, '76-'89 was always called 930 in factory codes. It is reflected in all Turbo specific part numbers.
For the public and on all public litterature by the factory, it was called the 911 turbo (or Turbo Carrera for the US version of the 3 liter car). The 930 is just the use of the factory code to designate the turbo, and not a name officially given to the car for the public by the factory.
My $0.02 GeorgeK