Thanks all. I have been told to avoid the R31 engine and that they arent nearly as good. I got this from a review on the R32 on Autospeed.
<begin> The RB range of turbo engines are stormers - and the GTS-t's 2-litre RB20DET is no exception. Note that the R32's DOHC, 24-valve turbo is a lot higher spec than the R31's (red rocker cover) version. In its updated form, the GTS-t motor features a 8.5:1 static compression ratio, double overhead cams, 24-valves, multi-point fuel injection, direct-fire ignition and - of course - an air-to-air intercooled turbocharger. <end>
Having a look at it tomorrow, the price is right and assuming it is an R32 type the Z is one step closer to RB power. Yeah...
There are actually 2 types of 'red-rocker' RB20DET (3 if you count the RB20DET-R). The type mentioned in the AS article is the early NICS or '12-port' version which had about 140kW in stock form. From about 1988 a second generation of 'red-rocker' engine appeared which is commonly called the 'ECCS' version. This vesrion had about 150kW standard. I have one of these in my HR31 coupe. It is very similar in spec to the R32 type with the major differences being a non-ball-bearing turbo and a slightly less refined engine management system.
There is no doubt that the R32 type is the best one to get. But don't look too much at the power figures quoted. Off-boost these engines are dogs...just about any NA 1600 (or even less in some cases) will see them off quite easily in the traffic light GP (if your into that sort of thing). In a light car, things will be better, but there's no doubt an RB25DET is the way to go if you can afford it (cubes, etc). On the up side, RB20DET's love to rev......
The RB20DET actually did make an appearance in a Z chassis...there was a Z31 model sold only in Japan known as the '200ZR'. It was only the NICS spec RB20DET, but it had the rear bowl sump and an intercooler mounted above the rocker cover (like GTiR).
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