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Old 03-29-2016, 03:09 PM   #1
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110 volt FICM vs 90 volt

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!
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Old 03-29-2016, 08:35 PM   #2
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What is the 90 volt good for?
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Old 03-30-2016, 12:19 AM   #3
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Year: 1999
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Chassis: IH 3800
Engine: Navistar DT466E
Rated Cap: 72 passenger
Quote:
Originally Posted by Robin97396 View Post
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!
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