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Re: 25 MPG with a 408 ??? Yup!!
[Re: Jerry]
#500622
10/22/09 02:17 PM
10/22/09 02:17 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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That low first gear must really do wonders for helping getting things moving off the line. I bet it's making a lot of difference to your launch with those 3.23's. 3.23's with a 727 1st gear would be pretty weak in comparisin IMO. For the thermoquad, member DEMONSIZZLER sells a divorced electric choke assy similar to what the newer edelbrock carbs run. It's adjustable and bolts to the carb, not the intake. I find the thermoquad does deliver good mileage, however I've found it to give interesting results on the wideband o2. With the easily adjustable primary metering rod tree, it's not hard to tweak it to get your a/f's in the range you want them to be. What kind of idle a/f's are you getting with your thermoquad? I've found mine loves to idle lean when the motor is up to temp. FWIW I've got a megasquirt system nearly ready to go for mine as well. I really wanted to get it in the car this year, but between having R&R'd my motor for an overhaul and my transmission dying a slow death I just did not have the time to get around to it.  I bought my stuff a couple years ago already, but at the time I bought a MS-2 and a prefabbed harness from diyautotune.com I could have made the harness myself, but with the prefabbed one basically you just have to attach your sensor connectors and run the wires to where you want them. Looks like it'll save a lot of time, mess and thinking. 
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Re: 25 MPG with a 408 ??? Yup!!
[Re: Jerry]
#500623
10/22/09 02:22 PM
10/22/09 02:22 PM
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Joined: Dec 2005
Posts: 1,151
Cruising!
QuickDodge
super stock
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super stock
Joined: Dec 2005
Posts: 1,151
Cruising!
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Very impressive mileage figures! I'd love to have a car like that for regular driving. Overdrive transmissions are a great idea. Much more comfortable highway cruising. Old school folks can say what they want, but some newer components are better! I had an M-body years ago that came from the factory with a 2.2? ratio rear end. With a 3 speed 904, 998 or something like that it was a dog on take off. I never drove it on the highway, but a lot of M-body owners claim they can get 20+mpg with the 2.2 and 2.45 axle ratios. For what it's worth, some Camaro's came with an overall gear ratio of just under 2 to 1. With a 408 and a fairly light weight car, you could probably pull these kinds of gears. I doubt it would make much difference in gas mileage. If you happen to have an unused higher gear axle laying around and want to experiment.....I'd be interested in the results!!  Have you kept a record of average fuel consumption?
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Re: 25 MPG with a 408 ??? Yup!!
[Re: QuickDodge]
#500624
10/22/09 02:32 PM
10/22/09 02:32 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Very impressive mileage figures! I'd love to have a car like that for regular driving.
Overdrive transmissions are a great idea. Much more comfortable highway cruising. Old school folks can say what they want, but some newer components are better!
I had an M-body years ago that came from the factory with a 2.2? ratio rear end. With a 3 speed 904, 998 or something like that it was a dog on take off. I never drove it on the highway, but a lot of M-body owners claim they can get 20+mpg with the 2.2 and 2.45 axle ratios.
For what it's worth, some Camaro's came with an overall gear ratio of just under 2 to 1. With a 408 and a fairly light weight car, you could probably pull these kinds of gears. I doubt it would make much difference in gas mileage. If you happen to have an unused higher gear axle laying around and want to experiment.....I'd be interested in the results!!
Have you kept a record of average fuel consumption?
best I got stock with my 5th ave (2.2 rear gear) was 25mpg at a constant 75-80mph going across michigan on a warm summer day. more typical was 23.
my 5th with the 360 and loose converter with the 2.2 wasn't too bad on takeoff, was a little soft, but it was a beast from about a 15-20mph roll....
FWIW GmachinedartGT (I think that's his handle) has a stroker small block with a solid roller, he runs 26" tires, a 2.94 gear, and a 904. IIRC he gets ~17-18mpg running at freeway speeds, and can still click off low 12 second quarters...not bad considering his tire/wheel package and suspension is set up for handling, not drag.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 25 MPG with a 408 ??? Yup!!
[Re: dmerc]
#500625
10/22/09 02:43 PM
10/22/09 02:43 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
let me know when your ready to switch over to efi. get a tunnel ram bottom on there with a custom top and some nice atomizing injectors and you could probably see another 2-3 mpg with alot of tuning and a wideband. with the efi you can really dial in what your engine needs, plus you can adjust your timing based on what your engine needs.
Jerry, you don't know how much I'd like to do a FAST EZ fuel injection set up. It would be awesome! It's so darn expensive though. Got any low buck set ups for a buddy? 
I already use a LM-1 for tuning
I don't think the FAST EZ system is sophisticated enough to make it worthwhile, it's still a TBI system, so you have potential wet flow fuel distribution issues. it doesn't control timing. if you're serious about EFI, I'd go full multiport. batch vs. sequential is much less of an issue.
for your setup, I like jerry's idea of a tunnel ram base, build a plenumn and use a mustang, LS1, 5.7 hemi, etc style throttle body at the front or side. ford motorsports 30lb/hr injectors should feed your mill, and would be easy to come by on ebay or craigslist.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 25 MPG with a 408 ??? Yup!!
[Re: DaytonaTurbo]
#500627
10/22/09 04:30 PM
10/22/09 04:30 PM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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Quote:
FWIW I've got a megasquirt system nearly ready to go for mine as well. I really wanted to get it in the car this year... but I just did not have the time to get around to it. I bought my stuff a couple years ago already...
Misery loves company! I've got 2 MS units sitting on the shelf, for at least 9 months, and only need time to get it done. Just need a round tuit! 
It would sure be nice to find some more Mopar guys running Megasquirt (and a local guy would be a Godsend!)
Parts I seek:
driver doorpanel, 65 Sport Fury, prefer black, needs to be 7-8 on 10 scale, might buy set
16" x 6" Dodge truck wheel(s), from early 70s?, takes 9" dogdish - need for a research job so cheaper is better.
69-73 C-body caliper brackets and/or splashields
Send a PM.
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Re: 25 MPG with a 408 ??? Yup!!
[Re: patrick]
#500628
10/22/09 05:13 PM
10/22/09 05:13 PM
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Joined: Dec 2004
Posts: 1,061
New Mexico
dmerc
OP
super stock
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OP
super stock
Joined: Dec 2004
Posts: 1,061
New Mexico
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Quote:
Quote:
Quote:
let me know when your ready to switch over to efi. get a tunnel ram bottom on there with a custom top and some nice atomizing injectors and you could probably see another 2-3 mpg with alot of tuning and a wideband. with the efi you can really dial in what your engine needs, plus you can adjust your timing based on what your engine needs.
Jerry, you don't know how much I'd like to do a FAST EZ fuel injection set up. It would be awesome! It's so darn expensive though. Got any low buck set ups for a buddy?
I already use a LM-1 for tuning
I don't think the FAST EZ system is sophisticated enough to make it worthwhile, it's still a TBI system, so you have potential wet flow fuel distribution issues. it doesn't control timing. if you're serious about EFI, I'd go full multiport. batch vs. sequential is much less of an issue.
for your setup, I like jerry's idea of a tunnel ram base, build a plenumn and use a mustang, LS1, 5.7 hemi, etc style throttle body at the front or side. ford motorsports 30lb/hr injectors should feed your mill, and would be easy to come by on ebay or craigslist.
IS THERE A TUNNEL RAM INTAKE THAT BOLTS UP TO MAGNUM HEADS?? Sorry about the caps.
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Re: 25 MPG with a 408 ??? Yup!!
[Re: dmerc]
#500629
10/22/09 05:49 PM
10/22/09 05:49 PM
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Joined: Nov 2007
Posts: 5,336
the house on the left.
cogen80
master
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master
Joined: Nov 2007
Posts: 5,336
the house on the left.
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Quote:
FWIW GmachinedartGT (I think that's his handle) has a stroker small block with a solid roller, he runs 26" tires, a 2.94 gear, and a 904. IIRC he gets ~17-18mpg running at freeway speeds, and can still click off low 12 second quarters...not bad considering his tire/wheel package and suspension is set up for handling, not drag.
i thought he said he went 12.7 and gets like 13 mpg.
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Re: 25 MPG with a 408 ??? Yup!!
[Re: Fury Fan]
#500630
10/22/09 07:01 PM
10/22/09 07:01 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
Quote:
FWIW I've got a megasquirt system nearly ready to go for mine as well. I really wanted to get it in the car this year... but I just did not have the time to get around to it. I bought my stuff a couple years ago already...
Misery loves company! I've got 2 MS units sitting on the shelf, for at least 9 months, and only need time to get it done. Just need a round tuit!
It would sure be nice to find some more Mopar guys running Megasquirt (and a local guy would be a Godsend!)
Well maybe we'll get around to ours at the same time. Over the winter I at least want to finish assembling the MS unit, drill/mount my fuel rails and get some of the plumbing started so at least I'll be good to go next spring. 
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Re: 25 MPG with a 408 ??? Yup!!
[Re: Fury Fan]
#500631
10/22/09 07:49 PM
10/22/09 07:49 PM
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Joined: Jan 2003
Posts: 3,704
MICHIGAN
DynoDave
master
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master
Joined: Jan 2003
Posts: 3,704
MICHIGAN
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Quote:
Quote:
why build a 408 to run 13.5? Who care about mpg...make it run right and you might be able to pull a 13.0.
Quote:
putting a 2.261 gear in a muscle car that you spent all kinds of $$$ building a 408 storker is like neutering your prize race horse because you want him to live longer.... if you wanted MPG's you could have just rebuilt a 318 and used a 2bbl throttle body.
Dang, Swingin', why you gotta rain on his parade?  It's his daily driver. The guy built a combo with a good sweetspot  he should be congratulated, not ridiculed.
Go put 4.88s in everything you own and poke your fuel tank with an icepick so you can use as much gas as you see fit.
 Thank you.
Sounds like a great combo dmerc!
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Re: 25 MPG with a 408 ??? Yup!!
[Re: dmerc]
#500632
10/22/09 08:20 PM
10/22/09 08:20 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Quote:
IS THERE A TUNNEL RAM INTAKE THAT BOLTS UP TO MAGNUM HEADS?? Sorry about the caps.
AFAIK the pattern is the same as any SB so I'd think a SB tunnel ram would fit.
Last edited by RapidRobert; 10/22/09 10:31 PM.
live every 24 hour block of time like it's your last day on earth
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Re: 25 MPG with a 408 ??? Yup!!
[Re: RapidRobert]
#500635
10/22/09 10:45 PM
10/22/09 10:45 PM
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Joined: Aug 2003
Posts: 11,179
Atco NJ
DJVCuda
I Live Here
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I Live Here
Joined: Aug 2003
Posts: 11,179
Atco NJ
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Quote:
Quote:
IS THERE A TUNNEL RAM INTAKE THAT BOLTS UP TO MAGNUM HEADS?? Sorry about the caps.
AFAIK the pattern is the same as any SB so I'd think a SB tunnel ram would fit.
you could redrill a t-ram...
i bet my eddy street ram would be a good candidate
FWIW - I have 3.23's and a 26" tall tire, running 3400 @ 75 and get a best oof 16 and average of 14 ( playing with it ) with my t-ram and mild 360 - on the 300 mile round trip to Carlisle every year..
I also run 12.56 in the quarter.
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Re: 25 MPG with a 408 ??? Yup!!
[Re: DaytonaTurbo]
#500636
10/22/09 10:50 PM
10/22/09 10:50 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I alway thought a TR would be unstreetable but there was a good thread a ways back & people shared that they are in fact VERY streetable w very little work & the visual appeal has gotta be good (or even a stub stack on a single carb sticking thru the hood).
live every 24 hour block of time like it's your last day on earth
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Re: 25 MPG with a 408 ??? Yup!!
[Re: hotlines]
#500640
10/23/09 06:47 AM
10/23/09 06:47 AM
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Joined: Dec 2004
Posts: 1,061
New Mexico
dmerc
OP
super stock
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OP
super stock
Joined: Dec 2004
Posts: 1,061
New Mexico
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Quote:
I'm have a W2 head 340 roller motor with low compression in my 64 Signet and could sure use an OD, I have a built 700R4 sitting in my shop. Where exactly can I get the conversion stuff needed to pull this off. Thank you in advance 
Several ways to do it but I used a plate from Wilcap. The rest you have to fab up yourself.
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