That inlet manifold is designed to take a G60 throttle body on a G40 engine. The G60 throttle bodies are quite bigger.
This is what i was reading from the website:
http://www.roettele-racing.de/shop/themes/kategorie/detail.php?artikelid=52&kategorieid=24&source=1&refertype=9This G75 charger is already in production. This loader can be fitted without modifications to the G60 . Additionally, we have incorporated our experience with the RS G65 loader . Software of the engine control is being considered and is mandatory.
The technology:
The loader is widened by 15 mm on each side , this is accomplished by new housing halves , which has the result that the primary and secondary shafts have to be manufactured with extra length , more counterweight. The loader attachment points in the engine compartment remain original . There will be two different fuel injection intake tract , once a for motorsports with over size between 100 mm and 120 mm for the airbox. Normal for the air filter connection and The displacer is of course also widened on both sides by 15 mm , the Dichtleistennut is extended to the maximum and the displacer is modified or streamlined in the outlet area . The calculated weight of the displacer is 1050 g, and thus has a maximum speed of 15,500 loader U / min, over bearing damage can be expected. Performance and boost growth , we have calculated only theoretically and remain our secret yet , but if it is clear it will be enough . Wait and see .
We are very excited about the first test kilometers , it is of course reported it.
Throughput calculation :
G40 : 566ccm3 per revolution
G60 : 860ccm3 per revolution
G75 calculated : 1060ccm3 per revolution (However, without taking into account the extended sub-channels , is based on only the enlargement of the chambers to 75mm)
So ever makes about 23 % more throughput than the G60 . The impact of the secondary air ducts we'll see.
News for G75
The speed tests are completed, we have really made the G75 with 16.770Umin on the dynamometer to the limit. Collides with the wall of the displacer is not but still . We are currently building a 6PK 160mm crankshaft , where we can already achieve 16.500Umin and the belt slips no longer guaranteed by a 80mm Pulley . We are currently building a very large boost pressure test system for our Yellow Polo, then the speed and performance tests shall be continued. We are only happy times and go with this charger in the long-term test . This loader we build into a Corrado 8V, so we get sometimes comparative data on the G60 and G65 charger.
