167–170
BHP · ZPJ 12V
The Peugeot 605 and the Citroën XM shared the last PRVs of the PSA group: the 12-valve ZPJ at 167-170 bhp, then — from 1989 — the 24-valve ZPJ4 and its ACAV variable intake, 200 bhp with no turbo at all.
Both saloons started with the 2,963 cc 12-valve ZPJ (167-170 bhp). In 1989 came the leap: the ZPJ4, a 24-valve specific to PSA with its own cylinder heads and variable-geometry ACAV intake — 200 bhp naturally aspirated on the 605 SV24 and XM V6 24S.
That same ZPJ4, twin-turbocharged by EIA, reached 408 bhp in the Venturi 400 GT — the most powerful PRV road car ever.
At the 1988 Paris Motor Show, Peugeot showed what the PRV could dream of: the Oxia concept and its WM-tuned 24-valve bi-turbo of 680 bhp, clocked at 350 km/h in testing. The story is on the Prototypes page.
From 1997, a 60° “PR” V6 — ES9 at Peugeot — succeeded the PRV on the 605 and XM. That engine is not a PRV: only the ZPJ and early ZPJ4 versions belong here.
The lion's earlier PRVs — 504 Coupé & Cabriolet, 604, 505 — are covered in their own file.
The 24-valve ZPJ4 and its ACAV intake, explained in detail.