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Engine Stage 2
TEST 2 – As Per TEST1 plus Hybrid Turbo Dynamics Twin Scroll Turbo and remapping – Overview
After careful consideration it was decided that initially we would look at improving the turbo charger design to try and improve on mid range punch, whilst still maintaining the quicker spool up of the standard twin scroll design, so evident during Stage 1.
Using basic concepts of how a turbo charger functions, it was decided that increasing the wheel housings and wheel sizes, whilst improving power, would be detrimental to driveability low down. It would be paramount that this area could not be compromised, although realising this would cap any major power gains, it was decided that this remit was more important for this specific level of tune.
PowerStation / Litchfield were aware of various combinations already tested during their development of the Type25, so this was the starting point for initial thoughts.
Looking at the market place it was evident that hardly any development had been completed by other companies in the twin scroll arena. Various options already available (based on reports and information available) gave mediocre performance gains, but increased lag by a fair amount. This at least gave us areas of modification to avoid.
Sticking with the standard size housing (to aid response) meant we were limited to what we could have modified on the standard unit, but discussions then started between PowerStation / Litchfield and Turbo Dynamics (one of the largest and most respected Turbo suppliers in the country) based on what we wanted the unit to achieve.
As well as the increase in mid-range power, we also wanted the unit to have a wider power range since the standard unit started to loose power around 6k rpm. We also wanted to eliminate any hints of low down surge, which was something the standard twin scroll unit gave (depending on boost and induction type used).
After a number of discussions between PowerStation / Litchfield and Turbo Dynamics, a new version of the twin scroll turbo was delivered for testing.
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