Maxzillian
07-01-2014, 08:55 PM
Here's a brain teaser for some of you guys. I have a fuel injection conversion on my 85 C-10 that is using a 96-97 LT1 PCM with a 350HO crate engine and TPI intake. It has long tube headers with the O2 sensors installed after the collectors and a bung for a wideband at the X-pipe that follows shortly after. Tuning software is Jet DST and ScanPro XL for datalogging. The wideband is an Innovate LM-2.
In tuning this truck I found that I had to lower my O2 switch points (or swing points) to as low as .05-.1 volts in order to make the wideband register 14.5-14.7:1. I've verified that the O2 sensor heaters are working and both banks register the same as far as datalogging is concerned. I've thought about air leaks, but I would think the wideband wouldn't disagree with the other sensors if that were the case.
Running the stock settings of around 0.3-0.5 volts would register around 12.5-13:1 on the wideband... great for power, but poor for mileage. Commanding WOT from the truck has the O2 sensors registering around 0.85-0.95 volts as one would expect.
In tuning this truck I found that I had to lower my O2 switch points (or swing points) to as low as .05-.1 volts in order to make the wideband register 14.5-14.7:1. I've verified that the O2 sensor heaters are working and both banks register the same as far as datalogging is concerned. I've thought about air leaks, but I would think the wideband wouldn't disagree with the other sensors if that were the case.
Running the stock settings of around 0.3-0.5 volts would register around 12.5-13:1 on the wideband... great for power, but poor for mileage. Commanding WOT from the truck has the O2 sensors registering around 0.85-0.95 volts as one would expect.