Hi B,
Very little info for these very rare models! Saw your post on DCS in 2021, are you trying to get info for that sim or anothers or just info?
GM1 was used less and less as the war went on. Down to several things really, the supply of N
2O which was a non essential war product; the system needed a lot of maintenance by qualified ground crew, it was operated under very high pressure, lots of pipe work which was susceptable to leaks (dangerous) and damage, and needed to work equally on twin engined ac. In fact most ac (singles and twins), had it removed when arriving from the factory as it was more bother than it was worth!!
I'm an ardent fan/reader of the Nachjagd, and I have never read that a pilot operated GM1 in their Ju88 nightfighter.
MW1 was still used to a degree by some ac, not sure about the S/T 88 series, but doubt it. MW1 was better as it cooled the intake charge at the same time as boosting it.
Yes, GM1 makes bigger bangs but a lot more heat, and with engines at max using ersatz oil/fuel I really do doubt it was used at all.
In fact it was used on the older MkXIII DH Mosquito NF's trying to catch and combat the Me410 intruders that were much faster. But it was never fitted as standard to the Mosquito.
I take it you've seen this?
Accident Junkers Ju 88 S-3 330931, 18 Dec 1944 which was from LG1.
Sorry I haven't any hard evidence for GM1 and the S3, I'll keep looking though and shout if I find anything definite.
Cheers
Shessi