110 volt FICM vs 90 volt

[GreyCoyote]

I'm looking at used school buses today I and ran into a question: which is preferred, the later model 110 volt DC FICM or the earlier 90 volt units?

I'm down to two candidate busses in this batch: a 1997 with a "hidden" 90 volt FICM located somewhere under the firewall, and a 1999 with an engine-mounted 110 volt FICM. The vehicles are in substantially the same condition with similar mileage and otherwise identical drivetrains and bodies, so this may be the tie-breaker.

Comments? Many thanks for your help!

[Robin97396]

What is the 90 volt good for?

[GreyCoyote]

Originally Posted by Robin97396

What is the 90 volt good for?

About 90 volts.

Not sure I understand your question, but the best I can tell there was a production change where the DT466E went from a 90 volt DC injector drive in 1998 to a 110 (also called a 115) volt DC injector drive in 1999. Apparently the aditional juice made a few tenths of a millisecond difference in accuracy, which was important for emissions.

I'm trying to determine is there is any risk/benefit to one system over the other. Cant find much on-line but figured I'd ask here anyway!