The new oil pressure regulator from Essex Rotary is based on a modified Mazda regulator but is designed to run a higher maximum oil pressure. Bringing the standard pressure on a series 1 RX-8 from from a maximum of 80 psi and increasing it to around 110psi this increased oil pressure means that your series 1 engine will now run pressures much closer to that of the later series 2 RX-8 (R3)
This makes the Essex Rotary enhanced oil pressure regulator great for ported ad high revving applications, equally suited in a standard engine its a great upgrade for piece of mind.
The main advantage of the increased oil pressure would be to increase bearing protection over that of the standard 80psi found in the series 1.
In our experience we have removed many oil pressure regulators from engines that have been running a maximum bypass pressure as low as 50-55 psi, This is around a 30-40% Loss in Oil Pressure across the rev range. Oil pressure this low is a serious contributing factor in bearing failure within the Rotary engine. Especially the RENEIS engine built for the RX-8