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High flo cats
#1 · October 8, 2020, 8:18 am
I have a EFI4 600 on a SBF with long tubes. Presently the o2 sensor is in the collector however I want to put hiflo cats right after the collector. The cats have an o2 bung. Just wondering if the o2 sensor should be located before the cat or exiting?
#2 · October 8, 2020, 9:25 am
I would say that if the O2 sensor is performing OK in-the-collector - leave it there. No need to create a variable that may confuse the current programming/learning. JMO
Werner Bartels
#3 · October 9, 2020, 11:32 am
Leave the O2 sensor a few inches after the collector, but before the cat. Us with older cars run no cats besides the ones that meow 🙂
1971 Mach 1 Mustang w/Ram Air, 408-4V stroked Cleveland, Hooker headers, FiTech EFI w/ RobBMC PowerSurge pump