| Re: TBI Questions & Google Groups [message #369302 is a reply to message #369297] |
Tue, 29 March 2022 05:06   |
 |
RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma:
|
Senior Member |
|
|
For the Wide-Band O2 sensor, you can't just hook it directly to the EBL equipped 7747 ECM. It needs to be connected to an interface box which takes the WB O2 signal and outputs a linear 0-5 volt signal to the ECM.
http://dynamicefi.com/TT-1.php
I use Dynamic EFI's TT-1 Wide-Band kit. I use it for displaying the actual Air Fuel Ratio (AFR) on the What's Up Display. I use a separate Narrow Band O2 sensor for the actual closed loop operation.
I have a Rochester TB and noticed when I first installed it the fuel pressure on on the low side, about 11.5PSI if I recall. I was able to turn the adjusting screw (not easy) and got it up to near 13PSI. It has slowly dropped over the years to about 12PSI now, so I'm going to look into a replacement regulator spring as pointed out by Randy.
I also do not use a surge tank. Once the fuel level gets to the 1/2 mark, I start looking for a gas station to refill. By that time I've drive 200-250 miles, about 4 hours and I need a break too.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
