I have a 2000 FLH with Magneti Morelli EFI. Currently, I have a PC III piggyback tuner and dual air / fuel gauges in my dash (I had 18mm bungs welded into my head pipes 2" - 3" from the head to accommodate the gauges.)

I purchased a compatible ThunderMax ECM and will be installing it this weekend.

QUESTION 1: Would installing a wye cable for the O2 sensors (so that I can simultaneously feed signal from the sensors to both my new ECM and to my gauges) have a negative impact on the readings seen by my new ECM?

QUESTION 2: Do you know where I could buy such a device?

Thanks in advance!

 

Can't "Y" them together. The box that the sensors connect to has a controller that takes their data and turns it into AFR. That controller also modulates the heater circuit of the sensor. There is no way to have one controller run two sensors.

 

Thundermax has it's own o2 sensors that plug directly in to the Thundermax ECU and is retained by a set screw. Your PC3 is reading thru your existing ECU to supply the gauges, doesn't come directly from the o2's.

 

I may not have described this correctly. I want to take the output from the front O2 sensor and route it to both my dash gauge and my ThunderMax ECM. I want to do the same with the rear ECM. Does that change your understanding of what I'm trying to do and your answer, or am I not understanding your reply?

 

The PCIII has no air/fuel capability by itself. He must have something else, like a dual channel AutoTune. That would be the only Dynojet product for dual widebands in one box. As for display, I'm guessing a LCD-200? Hard to say since he didn't specify.

 

Specifically what devices/products do you have that read/display the O2 sensors now?

 

Since 2000 FLH-s didn't have O2 sensors, neither my existing factory ECM or PC III is connected to the O2 sensors that I installed as part of my A/F gauge setup. My present O2 sensors only report to my gagues.

I'll be replacing my existing sensors with the ones that come with the T-Max, but I believe they are both the same Bosch sensor.

 

Right, but what gauge setup do you have? I assume it came with the sensors?

 

I should have included that. It's a product from Innovate Motorsports called the DLG-1 Dual Lambda Gauge with Bosch LSU 4.9 sensors.

https://www.innovatemotorsports.com/...gauge-kit.html

 

Yes it came with Bosch LSU 4.9 sensors.

https://www.innovatemotorsports.com/...gauge-kit.html
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