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[GMCnet] Integrated EFI [message #329335] Tue, 20 February 2018 13:28 Go to next message
Ken Henderson is currently offline  Ken Henderson   United States
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Registered: March 2004
Location: Americus, GA
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Senior Member
I've been real skeptical about the integrated EFI systems, like Fi-Tech,
because of my inherent EE's concern about the temperatures under automotive
hoods. Today I received one of the periodic product announcements from
Digikey (a top electronics distributor). This one covers very small
Automotive Power MOSFETs (electronic switches essential to such equipment
as ECUs). These are rated at 70A and UP TO 175*C=347*F!!!

Guess I haven't been paying attention since my re-retirement 24 years ago.
Maybe Y'All "Early Adopters" won't wind up beside the road after all. :-)

Ken H.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] Integrated EFI [message #329342 is a reply to message #329335] Tue, 20 February 2018 19:19 Go to previous messageGo to next message
bwevers is currently offline  bwevers   United States
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Registered: October 2010
Location: San Jose
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It seems that the OEMs put their ECU behind the firewall or next to the door pillar.
My Explorer has the ECU connector poking out of the firewall over the engine.
But the critical components are in the passenger compartment.



Bill Wevers GMC49ers, GMC Western States 1975 Glenbrook - Manny Powerdrive, OneTon 455 F Block, G heads San Jose
Re: [GMCnet] Integrated EFI [message #329363 is a reply to message #329335] Wed, 21 February 2018 08:20 Go to previous messageGo to next message
SeanKidd is currently offline  SeanKidd   United States
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Registered: June 2012
Location: Northern Neck Virginia
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If these integrated ECU throttle body manufacturers were smart, they would/should incorporate the heat sink into the Venturi bore, this way you would have a constant flow of "cold" air cooling it...

Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers
Re: [GMCnet] Integrated EFI [message #329364 is a reply to message #329363] Wed, 21 February 2018 08:29 Go to previous message
Justin Brady is currently offline  Justin Brady   United States
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Registered: April 2015
Location: Bell Buckle, TN
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The whole throttle body is an aluminum heat sink.
The issue isn't when its running, the vaporization of fuel and air flow keep it cool.
The issue is on a hot day after shutdown the heat soak. With no cooling air flow they get hot.

Whether that's a real issue or not remains to be seen. I would say not.


Justin Brady http://www.thegmcrv.com/ 1976 Palm Beach 455
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