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Engine Stage 3
Turbo - continued
With the wealth of experience AET Turbos have you can understand why we chose them as the supplier of choice for this stage of modification!
Ok... so we were sticking with a standard mount turbo, but we needed something that would hopefully meet our target of 500bhp. This was perhaps being slightly naive, especially when we wanted to do this on normal pump fuel (VPower) and without the need to run rocket ship boost. But based on all the development that PowerStation, Litchfield Imports & Cosworth had done on the engine platform we hoped we would be on the right track.
 With our requirements to hand AET at first subscribed one of their Subaru "drop in" turbos to test. AET (and us) realised that this would not be the first turbo (as further development would need to be done), but at least it would provide a benchmark and allow us to judge how the turbo and engine (plus other new anxillaries discussed further on) all  worked together. This first turbo was chosen from AET's VIPER range of performance turbos, and was based on a Garrett GT core using a standard fit exhaust housing and hybrid compressor housing utilising the latest specification of ball bearing core and blade set-up.
The first image above right shows the AET Viper turbo in all it's glory. Hard to see the size difference in this image, you can look at the second image below which shows the AET turbo against the original Spec C turbo. Whilst the turbo is clearly bigger, the naive ones (i.e. ME) never thought the physical size could dictate a turbo of delivering the power required. I was immediately put right by AET as it is not always the outside you should be looking at, but the inside....... that is where the magic begins. Who was I to argue!
With the turbo in our hands it was time to carry on with the engine build.
Up-Pipe
 One issue that was slightly glossed over by myself with PowerStation, was that whilst the turbo would be a direct fit replacement we wanted to keep the original twin scroll headers. Not only would this hopefully help response / spool but as these headers were tubular they had very good flow. This unfortunately meant PowerStation had to fabricate a twin in to single up-pipe (as the new turbo was a single scroll unit). Luckily Litchfield Imports had a twin to single scroll up-pipe (but with a Garrett turbo end) available which was for use with their Type25 Road Car. Nick at PowerStation soon took to the task of taking ends from one pipe to another to make a custom up-pipe for this specific configuration.
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