Iron Duke Intake / Bore Size ... (Page 3/3) 1985 Fiero GT OCT 29, 08:08 AM quote Originally posted by edfiero: The kit you reference is for a heated 02 sensor, not a wideband. Maybe there are other details of what you changed that weren't included here. For example, I always understood that you can't just substitute a wideband for a narrowband sensor. I thought some kind of 'black box' was needed to convert the signal into something the ECM could understand unless you are using a different ECM designed for a wideband. (Not sure on this, never tried it myself). Correct, that kit is still a narrowband, to the ECM it will only report whether it's rich or lean of 14.7, not how rich or lean it is. A wideband can be used on an ECM that is made for it, or it can be used standalone with a little display to tell you (not the ECM) the actual afr, while still outputting a narrowband signal to the ECM (rich or lean). Even ECMs that support widebands will usually need a wideband controller (the black box) that outputs a 0-5v signal, controls the built in heater, etc. 82-T/A [At Work] OCT 29, 10:46 AM quote Originally posted by 1985 Fiero GT: Correct, that kit is still a narrowband, to the ECM it will only report whether it's rich or lean of 14.7, not how rich or lean it is. A wideband can be used on an ECM that is made for it, or it can be used standalone with a little display to tell you (not the ECM) the actual afr, while still outputting a narrowband signal to the ECM (rich or lean). Even ECMs that support widebands will usually need a wideband controller (the black box) that outputs a 0-5v signal, controls the built in heater, etc. RGR, my hope is that at least being able to identify rich or lean, that I'll be able to dial it in enough. Ideally, I will also have a second fuel neck that I can swap out which will have a stock (non-adjustable) FPR... I want to see what the Fiero's stock configuration will look like with the larger injector and larger bore, but stock FPR. Raydar OCT 30, 08:31 AM Without commenting on all the finer points of your rework, I like the idea of needle bearings in the throttle shaft. I had an 88 Firebird Formula with a 2 barrel TBI, and the holes where the shaft went through started to wear. This, in turn, caused the throttle plate to bind in the bore. Made it a bear to drive smoothly. I ended up having to remove and re-center the throttle plate(s), in the bore. Also, when I built my 3.4, I had the throttle body bored out by Darrell Morse. (Isn't THAT a blast from the past...) The over bore also affected the ported vacuum for the EGR. Took me many hours to figure out why my EGR was so "finicky". So it is a thing. I hope you have better luck, but it sounds like the folks doing the work know what they are doing. 82-T/A [At Work] NOV 01, 08:18 PM quote Originally posted by Raydar: Without commenting on all the finer points of your rework, I like the idea of needle bearings in the throttle shaft. I had an 88 Firebird Formula with a 2 barrel TBI, and the holes where the shaft went through started to wear. This, in turn, caused the throttle plate to bind in the bore. Made it a bear to drive smoothly. I ended up having to remove and re-center the throttle plate(s), in the bore. Also, when I built my 3.4, I had the throttle body bored out by Darrell Morse. (Isn't THAT a blast from the past...) The over bore also affected the ported vacuum for the EGR. Took me many hours to figure out why my EGR was so "finicky". So it is a thing. I hope you have better luck, but it sounds like the folks doing the work know what they are doing. That's awesome! My throttle body (on my 87) also was bored out by Darrel Morse! Of course, the car has been in storage for 15 years. I also sent him my intake, and he ported it into the intake plenum. I'll eventually do the DAWG mod on that as well... just not sure when I'll get to it. I likely won't get that car out of storage until my daughter is in college.