AEM Electronics Wideband Air/Fuel UEGO Gauge Kits

Name: AEM Electronics Wideband Air/Fuel UEGO Gauge Kits
Price: 209.91 USD

zray · Mar 25, 2010

pprince said:
zRay, where did you put the o2 sensor?

about 3 or 4 inches after the tri-y header on the passenger side. I ran the wiring thru an existing hole in the firewall. I had a muffler shop install the bung for me.

I bought it from summit:

AEM Power 30-4100 - AEM Power Wideband UEGO Controller Air/Fuel Ratio Gauges - Overview - SummitRacing.com

Z.

ozarks06 · Jun 7, 2011

bnichols04 said:
what if i get a tweezer. how easy is that to tune myself? i don't think it is going to relearn cuz i am getting black crap out of the pipes still. i would like to do it myself if at all possible.

You will need to get a wideband O2 gauge to get the A/F right. I bought the AEM from Summit (AEM Power 30-4100 - AEM Power Digital Wideband Air/Fuel UEGO Gauge Kits - Overview - SummitRacing.com). It's $200 with the sensor (you only need ONE). You can play with the timing but you probably won't get it right on without a dyno. You'll either leave power on the table (too little) or blow it up with detonation (too much). You might be able to find a tuning book or a web post that will get you in the ballpark.

zray · Aug 23, 2011

dobrostang said:
"..........I'm going to try some modifications this winter to the Double pumper I found on a web site to get a little better mileage.

well. . . . share the wealth, what web site?

I very good investment is a wideband air/fuel ratio gauge permanently installed in an easy to see location, it's amazing to see how much leaner a carb can be safely tuned. The $200 spent will save you hours of carb (and timing) tuning.

analog
AEM Power 30-5130 - AEM Power Analog Wideband Air/Fuel UEGO Gauge Kits - Overview - SummitRacing.com

or

digital
AEM Power 30-4100 - AEM Power Digital Wideband Air/Fuel UEGO Gauge Kits - Overview - SummitRacing.com

also having a vacuum gauge helps to inform the driver when his foot is too far into the throttle.

Z

TommyK · Aug 23, 2011

zray said:
well. . . . share the wealth, what web site?

I very good investment is a wideband air/fuel ratio gauge permanently installed in an easy to see location, it's amazing to see how much leaner a carb can be safely tuned. The $200 spent will save you hours of carb (and timing) tuning.

analog
AEM Power 30-5130 - AEM Power Analog Wideband Air/Fuel UEGO Gauge Kits - Overview - SummitRacing.com

or

digital
AEM Power 30-4100 - AEM Power Digital Wideband Air/Fuel UEGO Gauge Kits - Overview - SummitRacing.com

also having a vacuum gauge helps to inform the driver when his foot is too far into the throttle.

Z

Yes it is amazing what can be learned with one of these devices. Innovate Motorsports has a site with a lot of in depth carb tuning info using a wideband. I've been playing around with one this summer on my 460 with a Holley 950hp. You would think that when you buy a new carb that the calibration would at least be in the ball park? Wasn't in my case and in many others.

I bought a wideband and about 40 bucks worth of taps, drill bits and brass set screws and I'm having a ball!.

zray · Aug 25, 2011

TexasEd said:
is there a tutorial on how to use that gauge?

I have good results by following these guidelines:

idle: as lean as the engine will tolerate and still idle smoothly. In my car thats about 13.7 to 14.0 depending on the ambient air temp.

just off idle at a steady cruising speed: low rpm and low engine output. Here is where you can run pretty lean w/o any ill effects, and get those mpg numbers up. At least 14.7 to 15.2

increased load: like in going up a long incline at a steady speed, 13.75 to 14.25

acceleration & wide open throttle: best horsepower is made around 13.5

I am using this gauge: http://www.summitracing.com/parts/AVM-30-4100/

I'm not liking the digital readout, as it doesn't really fit in with the other gauges. At some point I'm going to put in the analog version:
http://www.summitracing.com/parts/AVM-30-5130/

cold engine at idle:

full acceleration:

hope this helps,

Z.

zray · Jul 1, 2011

I'm using a Holley 650 DP

Holley 0-82651 - Holley Model 4150 HP Carburetors - Overview - SummitRacing.com

set up for the Paxton with advice from C. Conley. The solid floats

Holley 116-10 - Holley Carburetor Float Kits - Overview - SummitRacing.com

are widely available (summit, etc). We started with 71 pri. / 84 sec main jets, 6.5 power valve. Mr Conley also recommends enlarging the PVCR by 0.005. I am also using a wideband A/F ratio gauge (AEM make)

AEM Power 30-5130 - AEM Power Analog Wideband Air/Fuel UEGO Gauge Kits - Overview - SummitRacing.com
or
AEM Power 30-4100 - AEM Power Digital Wideband Air/Fuel UEGO Gauge Kits - Overview - SummitRacing.com

to help figure out the optimal carb setting. I was chasing a too rich condition for a long time. I went down on main jet sizes, changed power valves, both up and down. After a lot of wasted effort, I finally started changing the accelerator pump cams & fixed the issue. The stock float level is way too high and also needed to be lowered. However this is a general Holley condition and not Paxton specific.
I'm currently using 67 pri and 78 sec. main jets, 6.5 power valve & enlarged the PVCR by 0.04 to 0.044. Now using white accelerator pump cam (the pink one was stock). Another big improvement was to use a modified (marine) air diffuser on top of the carb to even out the air flow.
5-3/4" x 1-5/8" Tall Flame Arrestor, Aluminum

I could probably be using the bigger jets, etc if I had a different cylinder head. I'm using the stock Hi-Po cylinder heads and they don't flow as well as the modern heads do. I'd love to put on a set of AFR heads someday.

My timing advance was reduced from 40 degrees to 33 degrees. I would love to have one of these:
MSD Ignition 8762 - MSD Boost Timing Master Ignitions - Overview - SummitRacing.com

so I could run more advance overall.

This is my second Paxton on a basically stock Hi-Po 289. I have over 40,000 miles on the Paxton over a ten year period w/o any mechanical difficulties. That has to be some some of record.

if you need more specific information feel free to send me PM.

Z.

zray · Jun 29, 2012

I used this one for years:

http://www.summitracing.com/parts/AVM-30-4100/

it works great, that said, if I had it to do over again I would buy the analog version instead:

http://www.summitracing.com/parts/AVM-30-5130/

I think the digital readout looks out of place in a '60's era car.

Z.

ozarks06 · Jul 18, 2012

A/F meter is a great investment. Most people probably leave a lot of power on the table due to over rich tunes. It's great for EFI motors too. I use an AEM 30-4100 (http://www.summitracing.com/parts/AVM-30-4100/). I also wrote some logging software for it (it's here and free if you want it: South Street Performance Products). I need to finish the tach signal input so it will graph A/F against RPM.

zray · Dec 16, 2012

68_GT said:
".......... I know how extremely important a/f tuning as well as distributer (ignition) tuning is on these non computer controlled cars is, and I don't have the time, patience, or knowledge to figure it all out.

why not install an a/f meter in the cockpit and you will always know if the carb mixture is in the ballpark.

analog dial: http://www.summitracing.com/parts/avm-30-5130/overview/

digital dial: http://www.summitracing.com/parts/avm-30-4100

I've used the digital model for years. It has saved me countless hours when troubleshooting various carb and ignition issues. I do wish I'd bought the analog version, the digital one just doesn't blend in with a '60's era instrumentation.

Z.

zray · May 4, 2013

I have the AEM meter. Been using it for about 6 or 7 years with zero problems.

http://www.summitracing.com/parts/avm-30-4100/overview/

Although it is working perfectly, I recently bought an AEM analog read out gauge to replace it. I just grew tired of the digital readout gauge which looks out of place in a vintage car in my opinion.

http://www.summitracing.com/parts/avm-30-5130/overview/

Z.

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