Hi!
http://www.rulit.me/books/velikij-ilyushin-aviakonstruktor-1-read-356852-10.html
"On 16 March 1943, the Pilot v. Kokkinaki carried out the first flight of a high-altitude reconnaissance bomber, an Ilyushin 4TK with M-88b engines engines equipped with turbos of TC-3. The built-in Germokabina ventilation type for the pilot and navigator was to provide a lengthy flight in relatively comfortable conditions at a height of about 11 km. It was expected that the high altitude would protect the enemy fighter aircraft. For this reason, small arms were not available on the aircraft, although at the end of the 1930s there was a remotely-controlled machine-gun in the stratosphery side-11.
However, the computational height could not be reached. Above 9300 m, the plane was not raised. It took time to refill the car. But by mid-1943, when the Soviet air was almost dominated in the sky, it was possible to dispense without a stratospheric bomber."
Tumansky M-88 engine.
https://en.wikipedia.org/wiki/Tumansky_M-88
Another information.
http://alternathistory.com/vysotnyi-razvedchik-il-4tk-sssr-1943g
"Wingspan ; 21.44m, Length ; 14.76m, Height ; 4.10m, Area of wing ; 10.80 square meter,
Empty weight ; 6,500kg, Normal Flight weight ; 10,593kg, Maximum Flight weight ; 12,200kg,
Type of Engine ; 2×POA m-88b engines, Power ; 2x 1,100HP
Maximum speed, km/h ; Sea level ; 350km/h, At an altitude ; 405km/h
Practical range ; 4000km, Practical ceiling ; 11,000m
Crew ; 3-4
Weapons: Bomb load up to 1000 kg"
