Summary in 10 Seconds It is said that Stellantis may turn to Fiat GSE / FireFly Turbo engines after 1.2 PureTech. On the agenda is the adaptation of 1.3 and 1.5 liter GSE Turbo engines to Euro 7. This engine family differs from PureTech discussions with its chain distribution structure. The new engines are expected to be used with hybrid systems and eDCT transmission. The possibility of a significant change in Stellantis’ small-volume gasoline engine plan in Europe is increasing.
It is on the agenda that the 1.2 PureTech / EB2 family, which has been used in many brands of the group for a long time, will be gradually withdrawn and replaced by Fiat-origin GSE / FireFly Turbo engines. This topic is not just about the question of which engine will be used. The trust debate around the Euro 7 period, hybrid systems and PureTech shows that Stellantis can turn a different page on the internal combustion engine side.
The Euro 7 calendar for new types of passenger cars and light commercial vehicles in Europe starts on November 29, 2026. Fiat’s mark is getting stronger in Stellantis’ new gasoline engine plan. The new route talked about by Stellantis points to a gradual change based on model renewal cycles, rather than a sudden transition that will completely replace the 1.2 PureTech engine in one fell swoop. The main option on the agenda is Fiat’s GSE, also known as FireFly engine family.
This family stands out as a basis that can be adapted to the new emission and hybridization process in Europe, especially with its 1.3 and 1.5 liter turbo versions. The PureTech discussion has reopened engine preferences. 1.2 PureTech has been used in many models of Stellantis brands such as Peugeot, Citroën, Opel, DS, Fiat, Jeep, Alfa Romeo and Lancia for years. However, this engine family has created a strong trust issue on the user side, especially due to the durability debates that arose with the timing belt running in oil in previous generations.
Although technical changes have been made in the new generation 1.2 Turbo / PureTech derivatives, it is noteworthy that Fiat-origin GSE engines came to the table more powerfully in the group’s long-term gasoline engine strategy. The difference here is not just the brand origin; The fact that GSE / FireFly engines come with a chain distribution structure distinguishes them from the belt issue at the center of this discussion.
Why did Fiat GSE engines stand out? The GSE / FireFly family is not a new engine for Stellantis. This engine family developed by Fiat has been used in different markets for a long time. In Brazil, there are local versions of the 1.3-liter GSE Turbo version with outputs up to 185 hp and 270 Nm. On the European side, the 1.5-liter hybrid engine used in the Alfa Romeo Tonale is listed with a combined power value of 175 hp.
This table shows that Stellantis has a ready-made engine family. The real issue is how these engines will be adapted to Euro 7 norms, production plans in Europe and the group’s hybrid transmission architecture. Because small-volume gasoline engines are now evaluated not alone, but together with electrically assisted systems. eDCT transmission may be the key part of the new era. eDCT transmission occupies an important place in Stellantis’ hybrid plan.
The company took full control over the electrically assisted dual-clutch transmissions produced at Metz and Mirafiori. This transmission integrates the 21 kW electric motor into the structure and allows the internal combustion engine to be disabled under certain conditions in urban use. The Termoli factory is also planned to join the eDCT production network as of 2026. This decision shows that Stellantis wants to establish a more compatible infrastructure on the gasoline engine side while expanding hybrid vehicle production in Europe.
Therefore, the possible rise of Fiat GSE / FireFly engines should not be read as an engine change alone. The more accurate framework would be a new hybrid architecture built around a gasoline turbo engine, electrically assisted transmission and Euro 7 compliance. There are also points that are not clear for now. Which models will switch to these engines and when, whether there will be a retroactive change in existing PureTech engine vehicles, and the final technical values of the new GSE derivatives in Europe have not yet been announced.
Therefore, the safest reading is that Stellantis is seriously considering the Fiat engine family for the post-PureTech period and that this transition will be shaped by new model calendars.
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