IS TBI back?

[uncabob]

WOW!
Welcome to the forum. Good info.
My build is a ratrod 49 Jimmie PU with a 84 corvette Xfire against aTH400.
20k original miles on the engine. Using original TBI.
Could not find an original harness or ECM so went with the 1227747.
Not on the road yet but still working on the running gear and body.
Will a WBO2 help with the gasahol stoich problem?
Bob

[dave w]

Will a WBO2 help with the gasahol stoich problem?

It will help with understanding what the Air Fuel Ratio is in the exhaust. Is the engine running lean or running rich? Knowing what the Air Fuel Ratio is in the exhaust is very helpful for tuning the Oxygen Sensor voltage offsets and fuel table parameters for ethanol blended fuels. I often think of a WBO2 as just another tool in the toolbox, it simply measures the Air Fuel Ratio in the exhaust, nothing else. It's similar to a digital caliber, it's up to the skill of the user to know to do with the measurements from a digital caliper. The same is true with a WBO2, it's up to the skill of the tuner to know what to about the Air Fuel Ratios measured in the exhaust.

Once the WBO2 Air Fuel Ratio is included into a data log, corrections for an engine running Rich / Lean is less challenging ( corrections to fuel tables are actually measureable).

Using a laptop to fix a fuel table parameter is similar to changing jets in a carburetor, expect no gasoline smell in the shop.

dave w

[daveosx]

Could not find an original harness or ECM so went with the 1227747.
Not on the road yet but still working on the running gear and body.
Will a WBO2 help with the gasahol stoich problem?
Bob

Hi bob
Yes a few years ago people started substituting the 1227747 all three of the vettes had them on the floor when I got them.
There was a harness adapter to plug and play but most just re pinned the connectors.
My guys mechanics did not all three have electrical issues now.
I liked the GM ECU66 that was in the LT-1 and Cats Tuner for the tunes.
I will probably have to get a prom burner for the memcal ECMs used to have a TECH 1000 terminal, now for the older ECMs I only have an OTC with the cartridges.
I have the pin outs for the 1227747 and the 1226026.
I think I will post those with some other stuff I accumulated.

From what I understand about the ECM O2 input it is using the high or low signal to develop a block learn count that adjusts the fuel so I am not sure if the WBO2 on the old ECMs will function correctly.
At a birds eye view it will indicate if the system is running rich or lean so you can make adjustments manually I guess.
I am thinking about this for my own truck project.
Ideally I think a signal conditioner using a OP amp like a 741 or a 358 for duals would allow you to adjust the stoic preset and produce the narrowband signal to feed to the ECM.
Also I am thinking about making or hacking a flex fuel sensor to provide a basis for stoic condition.