Donzi Z22

Is there a good place on stock 350 Mag exhaust for O2 locations ? I'm installing a pro charger and was told to tune with a wide band. Any suggestion ?

Trash

Get the Wags Engineering wide band spacer or the one from LA Boat Parts. They sandwich between the lower manifold and the riser. Run one on each bank for a more complete reading.

justinp20012500

I have two news ones that I ordered that I will sale you for half price. Or if you just need one, I can do that. I'll throw in gaskets too.

Mine are these, just not anodized.

http://www.wagsengineering.com/oxygen-sensor-spacer/

NHGuy

My AEM paperwork recommends installing them at a downward angle so nothing (water) can get trapped in the sensor.
If you decide to ever get high performance exhaust you can weld in bungs at an angle that won't allow water or anything else to stay in the O2 sensors.
But unless you can back out the plugs in the factory risers the WAGS plates are the ticket for OE.

Baja Rooster

iTrader: (1)

NHGuy

No do not use this extension bung.

it will give you slow and sometimes incorrect readings because it isolates the sensor from the exhaust stream. It's intended to fool automotive check engine lights.

Tartilla

Wide band O2 for tuning marine sounds great. Is there any good examples of increased fuel efficiency etc?

Trash

You will not see any measurable difference in fuel economy. Throttle response, improved start up and idle control are the main benefits.

Tartilla

I was hoping that the wide band would help get a really accurate reading for WOT max speed, and jet accordingly
But mostly, for partial throttle at the best cruise speed.

Trying to get the best BSFC numbers at cruise.

Maybe FI is the better option.

underpsi68

You could see improvements with efficiency, fuel economy and performance IF your current tune is off. The wideband could help with this.