The combined effect of airframe shape and RAM of the production aircraft is estimated to have reduced the aircraft's RCS to a value thirty times smaller than that of the Su-27. [97] Sukhoi's patent for the T-50 stealth features cites an intention to reduce average RCS to approximately 0.1 to 1 m 2, compared to the Su-27's RCS of approximately 10 to 15 m 2. [93] [98] The Su-57's design emphasizes frontal stealth, with RCS-reducing features most apparent in the forward hemisphere; the shaping of the aft fuselage is less optimized for radar stealth compared to American stealth designs such as the F-22 and F-35, likely as a result of cost reduction as well as the Russian doctrine of operating the aircraft within the umbrella of friendly integrated air defense systems. [84] U.S. Treasury Sanctions Russia's Defense-Industrial Base, the Russian Duma and Its Members, and Sberbank CEO". U.S. Department of the Treasury . Retrieved 29 April 2022. The planned Su-57M will be equipped with a new engine from NPO Saturn in the mid-2020s under the development designation izdeliye 30 and eventually designated AL-51F-1. The powerplant is designed with an estimated thrust of 11 tonnes (107.9kN, 24,300lbf) dry and 17 tonnes (167kN, 37,500lbf) in afterburner. In addition to improved performance, reliability, and costs compared to the AL-41F1, the AL-51F-1 will also reduce the aircraft's radar and infrared signature with glass-fibre plastic IGVs and a new nozzle with serrated flaps. [105] [106] In May 2022, Russian sources claimed that Su-57 fighters were used two or three weeks after the start of the 2022 Russian invasion of Ukraine, striking targets with missiles outside of the zone of activity of Ukrainian air defenses, [181] just like other Russian aircraft that are also restricted mainly to Russian airspace. [182] It has been reported that Vietnam may become a customer of the Su-57. [216] The country is expected to acquire the fighters to replace its aging fleet of 11 Su-27s. On 9 July 2021, Vietnam announced its intention to buy Su-57 aircraft, but it is critical of the aircraft's workmanship. [214] [217] [ unreliable source?]

For striking surface targets, the aircraft can carry the 250kg (550lb) KAB-250 or 500kg (1,100lb) KAB-500 precision guided bombs in its main bays. Internal weapons also include the Kh-38M air-to-ground missile, Kh-35U (AS-20 "Kayak") anti-ship missile, Kh-58UShK (AS-11 "Kilter") anti-radiation missile, and Kh-59MK2 cruise missile. [115] For missions that do not require stealth, the Su-57 can carry stores on its six external hardpoints which can use most Russian tactical fighter weapons. New hypersonic missile with characteristics similar to the Kh-47M2 Kinzhal ALBM is also being developed for the Su-57. The missile is to have intra-body accommodation and smaller dimensions to allow it to be carried inside the Su-57's main bays. [116] [ unreliable source?] PAK FA – Russia Special Report". FlightGlobal. 2 August 2011. Archived from the original on 28 May 2014 . Retrieved 10 May 2014.

When you improve the power you will need to look at to the fuel system. The whole point of a diesel engine is to burn fuel, and this the N57 does effectively, but to avoid a very sooty and smoky output you need to increase the flow of air. Sukhoi fifth-generation fighter taxiing". BBC Russian Service. 24 December 2009. Archived from the original on 13 January 2010 . Retrieved 30 December 2009.

Gady, Franz-Stefan (23 April 2018). "India Pulls out of Joint Stealth Fighter Project With Russia". The Diplomat. Archived from the original on 26 April 2018. Butowski, Piotr. "T-50 Turning and Burning over Moscow". Air International. Vol.85, no.4 October 2013. Stamford, UK: Key Publishing. pp.79–82. Fit a set of uprated valve springs when you replace the cam, especially if you are focussing on getting more power at higher RPMs. NOTE: If your N57 has the CP4 fuel pump then you should upgrade this especially if remapping, the R90 or R70 are good options. The CP3 seems to be better able to cope when remapped but will usually top out around 350hp.By reducing rotational mass, your engine can rev up and down more rapidly, resulting in snappier acceleration.

A lighter flywheel also grants better throttle control. With a lighter component, you can more precisely modulate your throttle input, providing a smoother and more efficient driving experience. a b "Russia's 5th-generation fighter jet named as Su-57". TASS. Archived from the original on 12 August 2017 . Retrieved 11 August 2017. Majumdar, Dave (16 February 2017). "Russia's Fearsome PAK-FA Stealth Fighter Will Enter Service in 2018". The National Interest. Archived from the original on 9 April 2017 . Retrieved 9 April 2017. a b "Су-35С или Су-57: что важнее для ВКС России? – Армейский вестник". Army-news.ru. Archived from the original on 19 November 2018 . Retrieved 12 December 2018. It doesn't even feel like a diesel engine due to it's refinement and power delivery, and we would say these are severely detuned from the factory, so you have plenty of tuning potential from them. N57D30U0

Sukhoi used existing airframes as testbeds for various subsystems and concepts; the Su-47 tested internal weapon bays, and Su-27M prototypes served as testbeds for the flight control system and engines. [23] To reduce developmental risk and spread out associated costs, as well as to bridge the gap with extant fourth generation fighters, Sukhoi implemented some of the T-50's technology and features, such as propulsion and certain avionics, in an advanced derivative of the Su-27 called the T-10BM (Russian: БМ, short for: большая модернизация, lit.'Major Modernization'), which was eventually procured by the Russian Ministry of Defence in 2009 and entered service as the Su-35S in 2014. [24] [25] Russia's 5th-generation fighter jet gets advanced stealth coating". TASS. 11 January 2019. Archived from the original on 15 January 2019 . Retrieved 14 January 2019. Twin scroll turbochargers divert the exhaust gases into a couple of channels and feed these at differently designed vanes in the turbo. They also increase the scavenging effect of the engine.