I have the engine performance chart for the M-B OM 407 hA if you are interested, as my own O 305 G has this engine.
The final drive ratio would likely be 5.409:1 as in practice, buses fitted with this ratio with a good engine can can achieve 85-90 km/h. The standard ratio of 5.921:1 is good for only 75 km/h or so.
Hi and thanks. I've got the performance charts myself in a brochure from an exhibition in 1978 and the values in the engine_constfile should be correct. I chose the final drive ratio for a roughly 85km/h top speed, as apparently Omsi doesn't calculate correctly and the bus would be far too fast with the correct value. As far as I remember Mercedes claimed that the articulation control is working reliably up to a speed of 95km/h but no O305G was able to go that fast with the factory adjustments.
According to the aforementioned brochure the following final drive ratios were available: 6.734, 5.921 and 5.263, the latter most likely only in combination with either the OM407hA or the 4-speed gearbox with a very low 1st gear. I think this Bahnbus version is almost too powerful and accelerates too fast too, which might be down to Omsi again not calculating for example driving resistances correctly. It's fun though