While the engine's potential was never in question with Piquet taking nine pole positions in 1984, however the engine's mechanical reliability and durability under full work load suffered severely with regular engine blow ups and turbo failures becoming a common feature.
Aínda que a potencia do motor nunca foi discutida, Piquet logrou nove poles en 1984, con todo, a fiabilidade e durabilidade mecánica do motor baixo carga de traballo completo sufría roturas regularmente converténdose nunha característica común.