Re: 235 inline 6 running of fuel injection
 

Update?

Re: 235 inline 6 running of fuel injection
 

I am thinking about doing something similiar on a 250 out of a 76.

Re: 235 inline 6 running of fuel injection
 

I know Im grave digging here but anyone know this guy and if he got it figured out? Wouldn't mind give it a try myself...

Re: 235 inline 6 running of fuel injection
 

He hasn't been logged on the board since October of 2013

Re: 235 inline 6 running of fuel injection
 

6 cyl TBI conversions are relatively straightforward. The devil's in the details, of course. The way the OP modified the distributor is acceptable, the 4.3 TB is appropriately sized, and the heated O2 helps but shouldn't be needed. I'm not sure why the OP decided the stock ecm wouldn't work, there are plenty of EFI retrofits using early car or truck ecm's. The issue boils down to tuning... adjusting the parameters in the chip so the stock ecm works properly with a different size engine with some very different characteristics than the engine it was originally programmed for. As I read this post it seems like the OP followed a path that many others do: Retrofit efi with stock ecm and programming, try different combinations of stock parts to try and obtain acceptable performance from stock programming, come to grips with need to tune. If you're doing an EFI swap on a vintage engine consider tuning an essential part of the job.

If you start a thread asking for experiences or talking about what you want you might get additional input from those (including myself) who have had success.

Re: 235 inline 6 running of fuel injection
 

I know this is an older post, but I had question about o2 sensor placement. Since he was running the dual split headers like my setup, I didn't know if it was best to have the o2 where the headers merge or have a sensor on each header end? I've been looking at the newer Holly sniper or Ftech kits, and wanted to know what the best placement would be to get a proper reading.

Re: 235 inline 6 running of fuel injection
 

Putting the O2 sensor where the pipes merge usually gives the most accurate readings. Sometimes when you do this the sensor is far enough away from the engine that it cools off so a heated sensor is required. GM ran the O2 sensor in one pipe on many, many of their V6 and V8 engines and it worked fine. I did this with my '57. It will work with a TBI truck as well but if you're looking at installing a system with port injection and dual bank fuel trims you will want two sensors.