QUOTE(r_towle @ Apr 16 2015, 07:27 PM)
Yes, number 3 is the hottest.
For an O2 sensor you really should try to get it near the mixed merged end, yet still hot.
I use a tailpipe version for tuning, I figure after its tuned, it's TMI for me to watch.
Others have installed them in merged collectors from Busch, or triad..
Foley also has a few locations he suggests.
thanks, i will speak with chris foley - i have used a buddy's innovate LM-1 air fuel gauge with great success to dial in my MPS settings on a 2056 build with more displacement, compression, cam, but with stock EFI
i decided to purchase an innovate O2 sensor/gauge set up to permanently install in my 914 - i called innovate tech after i read their instructions NOT to install the O2 sensor in a muffler - tech told me that their recommended practice is to find the hot/lean cylinder and to install the O2 sensor down tube from there - that way your tuning doesn't get a lean cylinder too lean, which is my goal
at first, i preferred the idea for the muffler install (i have a triad) but when i ran this by several of my more sophisticated than myself mechanic/engineer porsche pals, they agreed with innovate
from what i understand here, cylinder #3 runs hot because of cooling issues - does the cylinder temp have any causation for lean/rich running?
thanks, brad