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Re: Where is my dang MPG?
[Re: furious70]
#1257087
06/26/12 01:15 PM
06/26/12 01:15 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
OP
super stock
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OP
super stock
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Eugene, Oregon
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FBO set my diz at 3100 for full mechanical advance, despite informing everything above (more or less) about the engine. Should I just throw in a Mr Gasket 925B set to drop the max advance RPM? It pulls all over but it doesn't really "come alive" until close to 3000 rpm, even if it doesn't improve mileage it feels like I'm leaving a lot of low-end power on the table.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: Where is my dang MPG?
[Re: dogdays]
#1257089
06/26/12 02:26 PM
06/26/12 02:26 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
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Eugene, Oregon
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Yes, as near as I can get it (I'm using a dial-back with a small scale on the dial so I might only be at 34). That's what the recommended setup for me was via FBO.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: Where is my dang MPG?
[Re: patrick]
#1257092
06/26/12 05:28 PM
06/26/12 05:28 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
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super stock
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OP
super stock
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Eugene, Oregon
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No, I'm using manifold vacuum. Let's not start that debate. It doesn't matter what source you use as soon as you're off idle, at that point vacuum is vacuum so it's not affecting my cruise timing, period.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: Where is my dang MPG?
[Re: Secret Chimp]
#1257093
06/26/12 07:54 PM
06/26/12 07:54 PM
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Joined: Jul 2003
Posts: 1,212
Canton, Ohio
Crazy68Dart
pro stock
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pro stock
Joined: Jul 2003
Posts: 1,212
Canton, Ohio
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Quote:
No, I'm using manifold vacuum. Let's not start that debate. It doesn't matter what source you use as soon as you're off idle, at that point vacuum is vacuum so it's not affecting my cruise timing, period.
Correct, plus manifold vacuum is going to help clean up the idle.
383, Hemi 4-Speed, AlterKtion, D60
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Re: Where is my dang MPG?
[Re: Crazy68Dart]
#1257094
06/26/12 09:06 PM
06/26/12 09:06 PM
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Joined: Oct 2007
Posts: 3,894
Oregon
hooziewhatsit
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master
Joined: Oct 2007
Posts: 3,894
Oregon
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What's your cruising RPM? And how much vacuum do you have there?
If you ever find yourself in a fair fight, your tactics suck.
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Re: Where is my dang MPG?
[Re: VoodooCLD]
#1257096
06/26/12 09:14 PM
06/26/12 09:14 PM
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Joined: Jan 2003
Posts: 4,150
lewiston, ID
cornucopia
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Joined: Jan 2003
Posts: 4,150
lewiston, ID
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Quote:
Heh, i get 19 MPG with my 4 cylinder 2 wheel drive 95 toyota tacoma.
Good luck with the 318.
WHAT? something wrong with your Toyota!  I have a 2wd '96 tacoma 4 cyl and I get 25-28 on the highway...
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Re: Where is my dang MPG?
[Re: hooziewhatsit]
#1257097
06/26/12 11:04 PM
06/26/12 11:04 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
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super stock
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OP
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Eugene, Oregon
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Quote:
What's your cruising RPM? And how much vacuum do you have there?
2000-2100, 19-20 inches.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: Where is my dang MPG?
[Re: SomeCarGuy]
#1257100
06/27/12 01:43 PM
06/27/12 01:43 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
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OP
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Posts: 817
Eugene, Oregon
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Quote:
Might the carb be too lean?
Maybe? It was too lean to run right on light throttle when I used .089 jets (same as stock, just Edelbrock pieces instead of the OEs) and rods with a .068 cruise step. Right now I'm using the original .066 cruise step rods and a .089 jet, which is how the carb came set up. I haven't tried going richer on it.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: Where is my dang MPG?
[Re: fox]
#1257101
06/27/12 01:45 PM
06/27/12 01:45 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
OP
super stock
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OP
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
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Quote:
If you understand carbs, you need to lean the off idle circuits.
It is about to the point of running on the mains but fuel is still flowing in the off-idle system.
I'd suggest finding the idle air bleeds and open them about .003 and try that.
I don't, but I'm trying. As I understand it though, AVSes only have fuel orifices you can drill out to enrichen the idle circuit, not air bleeds. The idle mixture screws in front are all I have to mess with as far as I know (and I have them turned in a quarter down from an unhappy lean idle right now).
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: Where is my dang MPG?
[Re: Secret Chimp]
#1257102
06/29/12 02:55 AM
06/29/12 02:55 AM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
OP
super stock
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OP
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
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Here is a random thought I had... tell me if I'm nuts.
I know it's bad to have too much of the idle transfer slots exposed on your idle setting.
What if I don't have enough of the transition slot exposed at my current setting - that is, what if the throttle opening I need to cruise on isn't enough to completely get on the main circuit and is still including the idle circuit too much?
I tried leaning down my idle to the point where I had to crack my idle screw open more yesterday and it still drove just fine, no stumble. I set it back to a vacuum-based idle again, but ought I try to lean down the idle circuit to the point where I need more of a minimum throttle opening and possibly get the idle circuit out of the equation, or at least run it leaner so when it is included it uses far less fuel? Or is this kookoo?
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: Where is my dang MPG?
[Re: Secret Chimp]
#1257103
06/29/12 03:32 AM
06/29/12 03:32 AM
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Joined: Oct 2007
Posts: 3,894
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,894
Oregon
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Was there a particular reason why Don set up your dist to not have full advance at your cruising RPMs?
Everything I've read indicates for a street car that's the thing to do, and could definitely be related to your MPG woes...
If you ever find yourself in a fair fight, your tactics suck.
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Re: Where is my dang MPG?
[Re: hooziewhatsit]
#1257104
06/29/12 11:57 AM
06/29/12 11:57 AM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
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Eugene, Oregon
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I have no idea. Which spring combo should I try? Some say 925bs bring it all in by under 1500... too quick I'm assuming.
I also need to stop late night drunken ruminations about this car ;P
Last edited by Secret Chimp; 06/29/12 12:00 PM.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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