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  carb tuning w/ an oxygen sensor

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Author Topic:   carb tuning w/ an oxygen sensor

Posts: 143
From: Hamilton, Ohio, USA
Registered: May 2001

posted 05-27-2002 03:04 PM     Click Here to See the Profile for MDF99     Edit/Delete Message   Reply w/Quote
I was reading online about carb tuning w/an oxygen sensor and was curious if anyone has tried this? The O2 sensor indicates rich or lean air/fuel ratio as voltage, you use this info to help select the correct main jets for your carb. I see that a simple unheated single wire O2 sensor is about $15. You weld a threaded female adapter into your header collector and screw in the sensor. Run the + sensor wire to a digital voltmeter, along with a ground wire. Then it's a matter of cruising around and watching your voltage reading and changing jets accordingly. Seems like it would be an interesting experiment for less than 20 bucks if you've got a digital voltmeter. Apparently the readings range from about 1100mv (1.1 volts) down to about 100mv (.1 volts). 400mv is about the ideal 14.7:1 air/fuel ratio, higher is rich, lower is lean.

Matt Fraley
1966 Mustang Coupe; 289, T-5, 9" 3.50

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V8 Thumper

Posts: 2830
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 05-27-2002 05:02 PM     Click Here to See the Profile for V8 Thumper     Edit/Delete Message   Reply w/Quote
A guy at a local speed shop swears by them... claims to have found BIG power via carb tuning/plugs with sensor readings. The only 'trick' part is welding the bung in the exhaust tube. I dunno, I just read plugs

Then again, I'm not trying to shave hundreths of seconds off 1380 times, just tuning for street power

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Daniel Jones

Posts: 426
From: St. Louis, MO
Registered: Aug 99

posted 05-27-2002 08:11 PM     Click Here to See the Profile for Daniel Jones     Edit/Delete Message   Reply w/Quote
Nearly all OEM O2 sensors are narrow band, meaning they basically toggle rich/lean around the stoichiometric mixture ratio (14.7:1 or so). For best fuel economy, you'd like to be on the lean side and for best power on the rich side. A narrow band sensor won't really get you to either of those points. If you want to do this, look for the DIY-EFI groups do-it-yourself wide band O2 sensor. It reads a wider range of fuel mixtures than a narrow band and will do the job. Be aware you'll still need to check your plugs for signs of detonation as O2 sensors only tell you about the ful mixture, not the timing.

Dan Jones

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Posts: 576
From: Austin, TX USA
Registered: Jun 99

posted 05-27-2002 08:39 PM     Click Here to See the Profile for pthornton     Edit/Delete Message   Reply w/Quote

Here's a DIY wide band kit. This is about as cheap as you will find. It uses a Honda sensor.


Boss 302 & Saleen S281

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