The Armored Combat Vehicle Puma started as a privat-venture betwen Krauss-Maffei and Diehl in 1983. The two first prototypes were ready first in spring 1986 with a Kuka 20mm two men turret and second in autumn with a Diehl 120mm mortar turret. 
ACV-Puma was intented as an export armored vehicle of the 16-28 t class. 
 

 
By 1983 original concept, it was offered with two engine options (400/600hp) to cope with the level of armor protection asked.
The running gear was a mixt of both Leopard-1 and 2 components :
- Leo-1 : road wheels, track support rollers, torsion bars and even the driver's seat ;
- Leo-2 : track adjuster, cooling system components and sproket hub.
It was possible to run the engine outside of its compartment. 
 
In 1988, the concept was improved further :
- the class range reached 38t ;
- the engines offer was 440 or 750hp strong ;
- the chassis was now available in two length (5/6 road wheels) and  hight/low profil hull (20cm).

The ACV-Puma was a contender at the Norwegian IFV programme from 1991 and the Turkish 1987 relaunched TIFV programme.
Norway chose CV-90 and Turkey, the AIFV.
(If anyone have information about how it was a serious contender, I'm interested)
It was also evaluated by the Swiss army in 1991. I don't know if it took part to the Char de grenadiers 2000 programme. 
 

In 1983´s concept, the difference betwen the low profil hull and the 20cm higher hight profil hull was obtained by a "box shape vertical raised" rear compartment. With the 1988's design, the front slop is now different to achieve a better ballistic protection. 
 
When considering documentations of this period, it's important to note the mine/IED protection was not a priority like today. 
 
I'll post soon a scan showing general layout of the troop compartment. It's a Marder/BMP old fashion one with soldiers facing outside. 
 
Even if it was not a success at exportation, I think ACV-Puma must be known because of both :
- the outdated combat beliefs of the 80's (still vigourous today) ;
- and advanced proposal  such as the differential hull length from the drawing board. 
 
I have a question :
Does anyone known if a 6 road wheels chassis was ever built ?

I can't read russian or ukraine language so the range of information is very limited for russian AFVs.
 
 
I'd like to have information about how fast turrets of soviet IFVs rotate.
 
 
Especially BMP2, BMP3, BTR-82

http://www.janes.com/article/53057/boxer-the-favourite-for-lithuanian-ifv-buy
 
30mm Cannon and Javelins for armament.
Is that the first vehicle mounting the Jav?
 

http://www.janes.com/article/52476/german-army-receives-first-production-standard-puma-aifv
 
30mm with airburst capability, and supposedly better mine protection than a Leo 2.