O2 or EGT ?

[Joe Marcinowski]

No one else with an opinion? Alan, are you saying its best to have both? Looking to weld fittings in before my headers go out to get coated.
Thanks, Joe

[LNorton]

Joe, I would go with an O2 sensor setup only. It is the only true way to see the Air/Fuel Ratio.

[Alan Roehrich]

Originally Posted by montys 55

I installed an autometer o2sensor in the collector as per the instructions an I get super lean readings 18-1.
Instructions on ngk website state sensor must be installed 10x the dia of the collector from the end of the collector. 3 1/2 x 10=35". anybody else have a problem.

No, we do not have that problem, and we've run the AFX setup for a year and a half. Almost any O2 sensor system will have those same instructions. What it means is that on a race car, unless you have a system on the car after the collectors, you'll get lean readings at idle and low RPM. When it's going down the track, it'll read just fine. At idle, the O2 readings are useless.

[Moparteacher]

I'm not familiar with what's available on the market, but I will say that you'll want a wide band O2 and a heated one at that. You'll also want to avoid any exhaust leaks before the O2. A secure ground for the header will also be required. Too close to the engine and it'll burn up, too close to the end of the collector and it'll read O2 between pulses.

[Jeff Lee]

Monty,
So are you saying it's impossible your too lean? Have you made adjustments to richen it up?

I am currently installing the FAST wide-band (and heated) dual O2 sensor. All I can say is it is one nice package using quality parts and wiring.

[Joe Marcinowski]

Is the NGK deal heated? Does the bung install in the collector?
Alan, I support sportsman racers whenever possible so Nitroplate was my choice.
Thanks for the response's
Joe

[Alan Roehrich]

Originally Posted by Joe Marcinowski

Is the NGK deal heated? Does the bung install in the collector?
Alan, I support sportsman racers whenever possible so Nitroplate was my choice.
Thanks for the response's
Joe

Joe,
The NGK has dual heaters, and the bung installs in one of the collectors.

[Jeff Lee]

Originally Posted by montys 55

jeff, engine runs great ss/fm shift 9000 does not miss a beat. autometer wide band heated.

What I'm wondering is how it runs when you tune it to 12.7:1 or thereabouts?

[Greenlight]

Originally Posted by montys 55

Alan thank you for the reply but i have 18.6-1 @WOT.

Check for an air leak (header gasket, etc.) ahead of the O2 sensor. This will definately give you a false (lean) reading.

[Chad Rhodes]

Originally Posted by Greenlight

Check for an air leak (header gasket, etc.) ahead of the O2 sensor. This will definately give you a false (lean) reading.

and the sensor may be junk