Your statement and mine are not mutually exclusive. I’ve had o2 sensors on my race cars for years.
Foxtrot Juliet Bravo
Holley EFI requires a very expensive O2 sensor to monitor methanol in their ECU’s. My engine is N/A no boost. I trust that O2 completely and tune with my time slips. Spark Plug tuning is irrelevant to me. These were 500+ runs.
Are those plugs from a methanol burning motor markemark?
113 bucks for a racepak o2 sensor.
True Bosch sensor (not a knock-off) $85
Bosch O2 sensor
Those plugs are skewed in reading because they were used with a Primer Plus plate that uses 93 pump gas to run on when not on the racing surface. During the run I was using MFI with methanol for these.
Like others said, MFI seams to runs best when fatter and I agree.
Here’s the O2 sensor that is required if you are using Holley EFI with methanol.
You can purchase this exact NTK sensor from MAD Racing and Glenn calibrates it to your specific fuel. Only difference is the harness is 8” shorter.
MAD Racing NTK
I’ve been using EFI methanol along with the PP plate for 18 months now on exact same engine. I removed a spark plug just now (see pic) from the engine with almost 300 EFI runs. The plug gap measures .041” now. Started at .030”. Put it back in and going to replace with the Autolite that is in the pic next to it at the start of next season.
Yep, you sent me the Bosch last year.
markemark never realized those Holley O2 were that much money! I will stick to my MFI and a couple of wrenches for my tuning.
1.34 9.42@ 142.41 1.29 5.97 @ 114.00 @ #3251 Better in 2022
427 BBC by S&S Speed Center, AFD, Enderle MFI by Spud Miller
Trackside Products, Sepanek Racing T400, Dynamic converter, Autoweld, Santhuff, Smith Racecraft,
His real name is Richard but they call it "**** Fords Body Shop"
Just to clarify, Holley Sniper & Terminator X EFI systems use the Bosch LSU4.9 WBO2 sensor, which can be bought at any parts store. The Holley Terminator (not Terminator X), HP & Dominator EFI systems must use the Holley EFI WBO2 sensors (Bosch LSU4.2, NTK UEGO), which has a different connector.
Without data, you’re just another guy with an opinion.
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