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Old 09-04-2019, 03:52 PM   #1
vic guilmino
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Default rich carb

holley carb go fat at start and low gear in high gear is is about 12.7
need help
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Old 09-04-2019, 04:19 PM   #2
Hacksaw
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Default Re: rich carb

Using a power valve in primary side?
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Old 09-04-2019, 07:51 PM   #3
Ralph A Powell
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Default Re: rich carb

Dripping Bosters?
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Old 09-06-2019, 07:41 PM   #4
vic guilmino
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Default Re: rich carb

yes power valve no dripping
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Old 09-06-2019, 08:36 PM   #5
RJ Sledge
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Default Re: rich carb

Vic
I’d be looking real hard at the idle circuit.
If your going off a 2-step, wot, it will be rich.
Footbraking you might play around with squirter size, most Holleys are around a 28 Stock I have run as high as a 43.
How fat is it down low ?

RJ
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Old 09-07-2019, 09:38 AM   #6
vic guilmino
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Default Re: rich carb

10.6 afr
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Old 09-07-2019, 07:22 PM   #7
RJ Sledge
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Default Re: rich carb

If your O2 is in your collector, and it is within 12” from the end, you will not get a “clear” read, it will always show rich until you bring up rpms as in making a pass down the track then it will read correctly.
You can slip on an 18” extension to the end of collector and tune it for lower rpms (2 step leave or foot brake leave). Then take off extension. It’s is sucking air back up past the O2 sensor and it will show rich until you get rpms up and going down track.

Good luck
RJ
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Old 09-07-2019, 09:14 PM   #8
Darrel Goheen
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Default Re: rich carb

Quote:
Originally Posted by RJ Sledge View Post
If your O2 is in your collector, and it is within 12” from the end, you will not get a “clear” read, it will always show rich until you bring up rpms as in making a pass down the track then it will read correctly.
You can slip on an 18” extension to the end of collector and tune it for lower rpms (2 step leave or foot brake leave). Then take off extension. It’s is sucking air back up past the O2 sensor and it will show rich until you get rpms up and going down track.

Good luck
RJ
Actually it'll show lean.
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Old 09-08-2019, 08:37 AM   #9
Glenn Briglio
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Default Re: rich carb

Put O2 sensor in primary pipe.
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Old 09-08-2019, 08:51 AM   #10
RJ Sledge
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Default Re: rich carb

In my experience on a carb combo it showed rich when staging with 2 step at 3000 rpms or so. Moving O2 or extending collector will correct that.

On an efi combo putting an extension on allowed us to tune it so it did not search and go lean/rich while in 2 step staging. Like the computer couldn’t make up its mind up from due to O2 not getting clean data. That was with a BS3 system but believe it to be the same with all.

Believe Vic’s combo is 780 Holley but maybe not.

RJ
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