Hmm........interesting one this :hmm:
The engines in stock were/are unrealistic. Boats in stock can travel at speeds that are excessive when compared with those speeds they were able to attain in RL.
Generally speaking, U-boats were stuck with whatever engine they were fitted with at time of building.
In GWX the upgrades give a COLLECTIVE increase of 2.07% and were tested in seas of 4m/sec. Any deterioration in speed would obviously result if the sea state was higher.
Wilhelm, my friend, you above most people have interracted wuth the GWX team over on our TS channel and as such are probably as aware as most if not in fact more so with the effort we put into offering a technical support mechanism for those who use the GWX mod.
I'm a little suprised you choose to respond with what can quite easily be perceived/described as with an
attitude when people do their level best to help.
Granted, a smiley or emoticom can be taken in a variety of ways, but take a step back and look through the responses thus far. IMO people are attempting to help you.
Telling people to "shut up" will achieve no more than a veritable silence on this and future requests for help.
Now come on young man, read the posts and let us see if we can resolve this matter.
For what it's worth.....I reckon you've either 'tinkered' with something or you've a faulty install.
Are you sure you've not added any third party kit?
