Installed wide band gauge

[Bluemonster71RT]

It's telling me I'm rich across the board. I reset the idle mix to get about 14.4 ish. As soon as I start driving it is rich and stays that way. Coasting, lite throttle, even deceleration. At WOT it is pegged rich.
I had a post last year that was "is my carb to big for my 383" It may be. No? So here is what I have. Holley 770 SA. I put the stock jets back in. I have the 6.5 pv. I did leave the larger .27 squirter in though. Stock was .25.
So what do you think my best options are? I pull between 11 and 12.5 for vacuum so I purchased a 5.5 pv. Could changing just that fix all of it or should I just keep down jetting until I get where it's just right?   

[GoodysGotaCuda]

There is no real reason for it to be pegged rich on decel, it should go pretty lean.

I'd start questioning the gauge and make sure the o2 is in good shape.

[Bluemonster71RT]

There is no real reason for it to be pegged rich on decel, it should go pretty lean.

I'd start questioning the gauge and make sure the o2 is in good shape.

It's just rich on decel about 13.9-14.3. Its only pegged rich at WOT. It does't go lean past 14.9 at all until a few min at idle.

[BS CUDA]

It's just rich on decel about 13.9-14.3. Its only pegged rich at WOT. It does't go lean past 14.9 at all until a few min at idle.

Isn't rich at all - what does the gauge read at idle? at cruise? at WOT?

[Bluemonster71RT]

Isn't rich at all - what does the gauge read at idle? at cruise? at WOT?

I set idle at 14.5ish. Normal cruse in 4th gear its between 10.3 and 11.4. At WOT all lights are amber and hits 5.5 will move to about 8.4 after a few seconds at wot.  Shouldn't it be about 11-12 range at WOT? Just about everything I read says that. To back up the richness my plugs show that it is rich. That and I always smell like unburnt fuel when I'm done driving.   

[734406pk]

It does sound rich on main metering. I would double check your base timing and float levels first, (make sure there are no crossed plug wires) then drop down maybe 4 jet sizes and see what the AFR is then. Going from a 6.5 PV to 5.5 PV is a good choice but it shouldn't effect your AFR at cruise light load.

[BS CUDA]

I set idle at 14.5ish. Normal cruse in 4th gear its between 10.3 and 11.4. At WOT all lights are amber and hits 5.5 will move to about 8.4 after a few seconds at wot.  Shouldn't it be about 11-12 range at WOT? Just about everything I read says that. To back up the richness my plugs show that it is rich. That and I always smell like unburnt fuel when I'm done driving.   

Idle should be set with the idle mixture screws to achieve highest manifold HG and desired RPM - I believe after that then the air bleeds need to be played with. At 5.5 to 8.4 I am surprised it continues to run - possible boiling fuel? As suggested I would drop 4 jets as well and test from there - if it continues to run real rich when warm then likely boiling.

 I run mine WOT at 12.6 for best drag race results - it does cruise at 11ish - idles at the lights at 14 - 15.

[cudabob496]

when I installed my wide band, it was reading around 11 A/F ratio.  Turned out
I had too large of jets on the Primary side.  Was at 84/84.  Went to 77/84, and now
I'm around 13.5 cruise and 12.5 full throttle.  You also may have a leaking power valve.

[Bluemonster71RT]

BTW I did set idle at highest vacuum first then trimmed it a hair because it was still eye burn rich. Timing is @22 ini and 38 total at 3000RPM. I might be able to go a bit more if need be. But for now Im going to drop the jets down and see where that takes me first.

[734406pk]

BTW I did set idle at highest vacuum first then trimmed it a hair because it was still eye burn rich. Timing is @22 ini and 38 total at 3000RPM. I might be able to go a bit more if need be. But for now Im going to drop the jets down and see where that takes me first.

The timing sound fine where it is. See what the jet change does to AFR.

[Bluemonster71RT]

I went 2 sizes down on both jets. So 70 primary and 73 secondary.  At first when I got on it, it took off well. R'd up faster than normal but hit a lean spot just as the secondaries were to open when I floored it and then took off strong.
The gauge was in the 11-12 normal cruise. It hit 9.5 for a second and was around 10.7-11.8 at WOT. With like a half second or less lean spot prior to the secondary opening.  On another note. For the first time ever. I let the clutch out and snotted it and the car just sat there and melted the rubber. Scared the crap out of me because it never did that before.  So whats the option now? Lighter spring for the secondary? Move up one jet on both? Or put the smaller pump nozzle on for a longer duration shot? 

[CUDA JAS]

I went 2 sizes down on both jets. So 70 primary and 73 secondary.  At first when I got on it, it took off well. R'd up faster than normal but hit a lean spot just as the secondaries were to open when I floored it and then took off strong.
The gauge was in the 11-12 normal cruise. It hit 9.5 for a second and was around 10.7-11.8 at WOT. With like a half second or less lean spot prior to the secondary opening.  On another note. For the first time ever. I let the clutch out and snotted it and the car just sat there and melted the rubber. Scared the crap out of me because it never did that before.  So whats the option now? Lighter spring for the secondary? Move up one jet on both? Or put the smaller pump nozzle on for a longer duration shot?

SO WOT was ok...so it sounds like the secondary jets are ok...I would change the secondary spring to one step lighter.

Jason

[734406pk]

I went 2 sizes down on both jets. So 70 primary and 73 secondary.  At first when I got on it, it took off well. R'd up faster than normal but hit a lean spot just as the secondaries were to open when I floored it and then took off strong.
The gauge was in the 11-12 normal cruise. It hit 9.5 for a second and was around 10.7-11.8 at WOT. With like a half second or less lean spot prior to the secondary opening.  On another note. For the first time ever. I let the clutch out and snotted it and the car just sat there and melted the rubber. Scared the crap out of me because it never did that before.  So whats the option now? Lighter spring for the secondary? Move up one jet on both? Or put the smaller pump nozzle on for a longer duration shot?

Pretty cool isn't it? Expect some "side effects" showing up during the carb tuning process that were masked by the prior over-rich condition (hesitation, etc). The trick is to do one change at a time or one circuit at a time. Put the 75 jets back in the secondary side for now, install the BLACK spring in the vacuum diaphragm to lock out the secondaries. Replace the 70 primary jet with a 68 and retest but try to stay in the main metering circuit (cruise rpm, light load steady state). Then read your AFR. Take note of the transition zone between idle and main metering. This is where the acellerator pump circuit comes into play. AFR should dip down slightly, then rise to 13-14 (and hold) after the pump shot burns off. Post your results.

[YO7_A66]

Your making good progress! Be patient and don't worry about WOT until later. Start at the bottom and work your way up to WOT!

[Bluemonster71RT]

Hopefully the rain stays away. Doesn't look good. I think I'll put the black spring in first now and record the numbers. Then go down a jet size and compare.  Then Ill try the light spring just to see what that does if the lean spot persists.