Just thought I'd throw this out there for you guys. Last spring, I had built a new engine and transmission for my '86 F-150. Never did get around to tuning the carb in as I was too busy through the summer.

Ordered a AEM Gauge, Wideband UEGO, Digital, Air/Fuel Ratio through Summit Racing.

https://www.summitracing.com/parts/avm-30-4110

Got it hooked up this weekend, and this thing is amazing. I was really surprised how fast it keeps up with throttle position changes monitoring the air/fuel ratios.

What did I find out? The carb tuning is waaaaay off. Over the next few weeks, I will get everything tuned in and we'll see how much of a difference it makes. BTW, the gauge will only go to 10.0:1, so you know tuning is that far off.

Threw together a crappy video for ya just so you can see how fast this thing is.


If you're wondering, this gauge is worth every penny I paid for it.

 

Groovy! Where did you install the sensor? I'm wondering how much the distance from the engine would matter.

 

I'll quote the instructions here
"Mount the O2 sensor in the exhaust system at least 18 inches downstream from the exhaust port. If you anticipate high EGT's (over 800C), run a turbocharger, run at high RPM for extended periods of time or plan on running leaded race fuel then you must mount the sensor at least 36 inches or more downstream of the exhaust port as all of these can cause the sensor to overheat."

I put mine close to the back of the transmission, right behind the trans cross member. Basically, where there was room.

 

I picked up an Innovate LM-2 a few months back, carb tuning is a whole lot easier. Plug reading is a lot tougher with unleaded fuel, plus oxygenates and ethanol.

I use the LM-2 along with a vacuum gauge to determine steady cruise manifold vacuum for power valve selection and cruise jetting. Was able to lean out the highway cruise quite a bit, then opened the PVCRs slightly to bring back the wide open throttle afr. Lean mixtures are no problem at steady highway so long as there's no misfire or stumble, a hot ignition is important. But don't ever go lean on power, that will roast valves or grenade an engine.

 

I have the same AEM unit. Sure works good, and makes carb tuning easy.

 

...ooh you old guys, get it via BLUETOOTH on my SMARTPHONE
PRO-AFR Breitband-Lambdasondencontroller BLUETOOTH - PRO-CHIPTUNING ONLINE SHOP

sorry, it's in german only

hardy