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Old 08-12-2009, 12:20 PM   #21
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What's your vacuum at idle?
Well, since I'm idle all week, some would say I live in a vacuum. Of course, if the time /space continuim doesn't tear.
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Old 08-12-2009, 01:10 PM   #22
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Well, since I'm idle all week, some would say I live in a vacuum. Of course, if the time /space continuim doesn't tear.
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Old 08-12-2009, 03:33 PM   #23
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What's your vacuum at idle?
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Originally Posted by enkeivette View Post
Now that I have more timing and a higher idle, vacuum is closer to 8".
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Old 08-12-2009, 04:23 PM   #24
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"Now that I have more timing and a higher idle, vacuum is closer to 8".

Ok, don't remember seeing that. 6.4 PV should be fine.
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Old 08-12-2009, 09:31 PM   #25
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Update:

Installed the 6.5PV, doesn't lean spit at low rpm, only mid rpm.

Installed the 69 jets on the primary block. Didn't do much, drives a liiitle better.

Leaned out the idle mixture screws, discovered something! The idle mixture screws have a big effect on cruise AFR. So before I drill out the PVCRs, which I almost did today, I'm going to richen the main jets while leaning the idle mixture to see if I can get it rich enough not to spit without dropping below a 14.5 cruise AFR.

I can see the light, and hopefully I can leave my drill in the droor.
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Old 08-12-2009, 11:17 PM   #26
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Leaned out the idle mixture screws, discovered something! The idle mixture screws have a big effect on cruise AFR.
http://vettemod.com/forum/showpost.p...3&postcount=32
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Old 08-13-2009, 12:15 AM   #27
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That was an awesome post. I think I might have actually understood and learned something.
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Old 08-13-2009, 01:22 PM   #28
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Good read Bird, thanks!

Not happy yet, but definitely getting somewhere. Changed the 69s to 73s and the secondaries are still 80. I would have liked to have tried 71 but 73 was the next size up in my collection.



The idle AFR is pissing me off, I'll tune it to 14.7:1 and all is fine, let the car sit for 20 mins and it wants to idle at 17:1.

So I have it sort of stable now at 14.7 again with a cruise in the high 13s and under boost she is in the low 13s. I could leave it as is, but I'd like to lean out the cruise a bit more and get it around 12 under boost. Still haven't gone WOT, don't want to till I get it around 12 under boost.

There is no longer a lean spit btw.

I'm thinking about buying and installing 71s and 84s. What do yall think?
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Old 08-13-2009, 05:44 PM   #29
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I sent Lars a link to VM. He is the carb guru.
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Old 08-15-2009, 09:50 AM   #30
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I sent Lars a link to VM. He is the carb guru.
http://vettemod.com/forum/showpost.p...02&postcount=6
The defenitive answer. Far different from what I expected, but Lars is the guru.
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