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#1 |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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improving fuel milege???
anyways to help with fuel economy in my truck???
![]() any little bit help, it averages about 11mpg right now. here are the specs on it 355ci 10:1 Compression Ratio Holley systemaxII alum. heads Comp cams 270H magnum Holley street dominator intake MSD Pro-Billet distributor #8361 MSD Blaster2 Coil MSD 6AL Ignition box Edelbrock Thunder Series 650cfm AVS carb Aeromotive Billet Fuel Pressure Regulator shortie headers K&N 4" Open Element air filter 3.73 gears Eaton Limited-Slip Diff. Th350c transmission 2800 stall torque conveter B&M Stacked plate trans cooler trans-go transpack i'm thinking a new carb, but the one i want is SO expensive ![]() and i plan on getting a built up 700r4, but those are expensive too and the torque converters are expensive for them too! |
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#2 |
Insert Witty Text Here
Join Date: Oct 2002
Location: San Antonio, TX
Posts: 3,415
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Re: improving fuel milege???
It sounds like a built up 700R4 is the next step. That will be expensive, of course, which is why I don't have one.
![]() I doubt you'll do much better than that with a TH350 and 3.73 gears. I'm surprised that your mileage is that high. Slonaker |
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#3 | |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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Re: improving fuel milege???
Quote:
i was telling angie i was gonna spend our tax return on a new tranny and a blower for my truck. she just laughed at me ![]() |
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#4 |
Registered User
![]() Join Date: Apr 2005
Location: Ar
Posts: 558
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Re: improving fuel milege???
Man you should just sell me that truck and get you a Nissan Hardbody for increased fuel economy
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#5 |
www.73-87chevytrucks.com
![]() Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
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Re: improving fuel milege???
Putting a Demon on there would be going backwards in gas mileage in my experience. For mileage a spreadbore would be a better choice.
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Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com |
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#6 |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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Re: improving fuel milege???
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#7 |
OL BLUU
![]() Join Date: Mar 2004
Location: WICHITA, KS.
Posts: 1,065
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Re: improving fuel milege???
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#8 |
Registered User
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,906
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Re: improving fuel milege???
I think fuel injection would be a good step for a bit of increased MPG and performance as well. Then a built 700r4....
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Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call |
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#9 |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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Re: improving fuel milege???
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#10 | |
No No
Join Date: Jun 2005
Location: Pueblo Colorado
Posts: 1,781
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Re: improving fuel milege???
Quote:
Actually the Blower would increase your fuel economy as long as you drive like a granny. Only problem is that 10:1 compression ratio needs to drop a few points before the blower goes on.
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1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler |
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#11 |
needin' money
Join Date: May 2005
Location: Chickasha, Oklahoma
Posts: 1,106
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Re: improving fuel milege???
700r4's suck, listen, if you are wanting to do that get a gearvendor's overdrive
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SWB Stands for Short Wide Bed |
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#12 |
Cruzzzn' Vet
Join Date: Jan 2005
Location: Porterville,Ca.
Posts: 1,918
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Re: improving fuel milege???
It's a tradeoff, with all those go fast goodies on the engine,10.1 compr. don't think it's gonna happen, since it's not your DD I wouldn't worry about it, cake is good but sometimes you can't eat it.
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#13 |
Slugish
![]() Join Date: Jan 2005
Location: Earlysville, Va.
Posts: 1,024
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Consider putting a lower # gear ratio in ,like a 3.42 or 3.23. With your engine you would still have a good low end & be able to cruise without engine souding like its going to blow up. Ihad a 3.73 in my truck with the 3 speed turbo trans. but took it out . 350 / 3.73 is agood combo if you run mostly on the strip.
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#14 |
Slugish
![]() Join Date: Jan 2005
Location: Earlysville, Va.
Posts: 1,024
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Re: improving fuel milege???
What is a gearvender overdrive. Im interested.
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#15 |
Insert Witty Text Here
Join Date: Oct 2002
Location: San Antonio, TX
Posts: 3,415
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Re: improving fuel milege???
For wgat one will cost, you could buy another truck. I'd love to have one, but not for that kind of money.
http://www.gearvendors.com/ Slonaker |
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#16 |
Workaholic
Join Date: Oct 2002
Location: Katy, TX
Posts: 1,589
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Re: improving fuel milege???
Dude, you've been around long enough to know the answer to this question.
![]() If you are getting a true 11mpg with current setup do a happy dance ![]() These bricks are not gonna get 18mpg despite the constant claims we all see here. ![]() |
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#17 |
Bulky
Join Date: Aug 2004
Location: Rhode Island
Posts: 163
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Re: improving fuel milege???
You could always do the "Poor Man's" Gear Vendor..... This is an old "DoodleBug" for sale up here locally. It has a 4 speed attached to a 3 speed.
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2016 Silverado 1930 Model A Hot Rod 1923 Ford A/SR Altered - Injected 409 1982 Honda CB900F Super Sport Dad's 1970 GMC 9' Stepside Dad's 1969 GMC Custom Camper |
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#18 | |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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Re: improving fuel milege???
Quote:
![]() ![]() yeah its about 11mpg a little less on the highway. not like it matters, the mustang gets 20mpg so i'm fine with that. the trucks had maybe 300 miles put on her in the past year ![]() so i'm gonna end up buying the speed demon 650 carb, which means i'll have that 650 edelbrock and accessories for sale soon ![]() ![]() |
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#19 |
dang its hot
Join Date: Nov 2006
Location: frankfort kentucky
Posts: 1,349
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Re: improving fuel milege???
do the 700 tranny, I have one behind my big block witha 2500 stall(lock up) and it does 16-17 on highway at 65mph, of course thats no wind and good baro pressure yadda yadda....
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#20 |
Happy to be here
![]() Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
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Re: improving fuel milege???
Screw mpg, just focus an ET and forget the rest...
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Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra" |
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#21 |
needin' money
Join Date: May 2005
Location: Chickasha, Oklahoma
Posts: 1,106
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Re: improving fuel milege???
__________________
SWB Stands for Short Wide Bed |
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#22 |
Registered User
Join Date: Sep 2005
Location: Sun City West, Az
Posts: 3,822
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Re: improving fuel milege???
i agee,if you want mpg....get a datsun.
![]() Last edited by boatpuller; 02-10-2007 at 01:13 PM. |
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#23 |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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Re: improving fuel milege???
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#24 |
needin' money
Join Date: May 2005
Location: Chickasha, Oklahoma
Posts: 1,106
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Re: improving fuel milege???
what does the truck run, if i remember the stang is 13.80x
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SWB Stands for Short Wide Bed |
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#25 |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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Re: improving fuel milege???
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