So just a little update to my thread.
I got involved in a discussion on another part of the forum, on someone who was interested in upgrading his turbo on his GT cloverleaf.. And on replying with what spec and tune i was running with my GT, i was bombarded with a few lets say "interesting" comments i felt fairly i needed to investigate.
I always thought i had an off the shelf stage one MD556 hybrid, made by Turbo dynamics.
I sent the company an email asking a few questions on my unit. And today i received a reply. Which i am very happy with for a number of reasons.
The turbocharger we supplied AutoLusso at the time, which I presume was for your car, was a bespoke turbo designed to meet the criteria asked for by Autolusso. It was not an MDX556 or any other spec we advertise. For your information, whilst we list lots of different hybrid turbos online, a large portion of our work is building one-off specifications that are designed in collaboration with our customers to suit their individual requirements. The specification of your turbocharger includes a 56mm / 41.55mm MFS billet aluminium extended tip compressor wheel. It also includes a cutback/clipping to the turbine wheel (15 degrees) and improved turbine end oil seal (staggered gap type). We use the latest vibration sorting rigs (balancers) and vane-flow test-rigs to ensure all VNT type turbochargers meet our strict tolerances and build quality. You will notice the link Andy sent you also refers to a ‘360 degree thrust bearing’. Customers expect a 360 degree thrust bearing and many aren’t aware they are fitted to many modern turbos from the factory, so for obvious reasons we include this detail in the specs online so customers know exactly what they are getting when ordering online or reviewing our specs online. We do not brandish this part as ‘upgraded’ or ‘special’ in any way for these particular turbos, but the fact that the turbo has a 360 degree thrust bearing is an important bit of information nonetheless, so it is simply listed as “360 degree thrust bearing”. The subject of boost pressure and the figure of 24PSI is a moot point, as the turbo we built for your car is not a listed spec, nor is there any advertising for it online – it would have been discussed with Autolusso at the point of sale. As I understand it your feedback for this turbo set up was very positive and you were impressed with the power delivery and performance of the turbo. I do hope your opinion of Turbo Dynamics and the products/services we offer remain untainted by the opinions of the few misguided ‘keyboard warriors’ who proclaim to be experts or professionals.
If you have any questions or would like to start looking at other turbo options, feel free to drop me an email or call the office for a chat.
Turbo Dynamics Limited
20-21 Somerford Business Park, Wilverley Road, Christchurch, Dorset, BH23 3RU. United Kingdom
Tel: + 44(0) 1202 487497
Fax: + 44(0) 1202 487467
Visit our websites: Turbo Dynamics - Design & manufacture of turbo's for all applications
and Hybrid Turbos - Specialists in turbocharger technology