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03-21-2011, 07:57 PM
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#1 |
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Registered User
Join Date: Nov 2010
Location: Ingram, Texas
Posts: 106
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mpg issue
i know these trucksare not build for gas mileage but i want to get what the truck should my 05 gets 23mpg avg. wich is in same area as my friends with 350's my question is does anyone no whats wrong its all origional 1983
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'83 chevy c-10 scottsdale 400 cid 2wd "chelsea" |
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03-21-2011, 08:12 PM
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#2 |
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Registered User
Join Date: Jul 2010
Location: Georgetown, KY
Posts: 183
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Re: mpg issue
What kind of carb, tranny, and rear end gear have you got?
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Andrew 1987 V20 Scottsdale 383 TBI, SM465, NP208, 14FF, 4.10 1988 C1500 Scottsdale 305, 700R4, 3.08 1986 K30 Custom Deluxe 6.2, SM465, NP205, 14FF, 4.10 |
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03-21-2011, 09:06 PM
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#3 |
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Registered User
Join Date: Nov 2010
Location: Ingram, Texas
Posts: 106
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Re: mpg issue
rochester q-jet 700r4 and stock gm 12-bolt
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'83 chevy c-10 scottsdale 400 cid 2wd "chelsea" |
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03-21-2011, 10:15 PM
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#4 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: mpg issue
What are the rear gears and tire size? Does it have OD? A 83 carb is old! I would rebuild it and tune it!! Does it sill have cats? Mufflers? The old stock 305 in my truck could squeeze out 18 MPG and smoking on three cylinders! You definately need some engine work. Replace all the hoses. You probably have a vacuum loss somewhere.
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03-21-2011, 10:24 PM
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#5 |
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Registered User
Join Date: Nov 2010
Location: Ingram, Texas
Posts: 106
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Re: mpg issue
idk gears it has 31 inch tires od no cat new muffler and that might have somthin to do with it
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'83 chevy c-10 scottsdale 400 cid 2wd "chelsea" |
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03-21-2011, 10:44 PM
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#6 |
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Registered User
Join Date: Jul 2010
Location: Georgetown, KY
Posts: 183
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Re: mpg issue
Knowing your rear end gear will help greatly. Look at the sheet inside the glovebox (if you still have it) and see what it says. What kind of mileage are you currently getting?
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Andrew 1987 V20 Scottsdale 383 TBI, SM465, NP208, 14FF, 4.10 1988 C1500 Scottsdale 305, 700R4, 3.08 1986 K30 Custom Deluxe 6.2, SM465, NP205, 14FF, 4.10 |
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03-22-2011, 12:05 AM
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#7 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: mpg issue
Are you correcting the speedo for the tire size in your calculations? The speedo will turn a lot slower with those tires.
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03-22-2011, 02:39 PM
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#8 |
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Registered User
Join Date: Nov 2010
Location: Ingram, Texas
Posts: 106
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Re: mpg issue
i have one slip but it doesnt say bout ratio i have corrected speedo but i do know how off it is thanks to the handy dandy sheriff and i am getting 13mpg avg.
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'83 chevy c-10 scottsdale 400 cid 2wd "chelsea" |
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04-14-2011, 12:49 AM
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#9 |
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Registered User
Join Date: Apr 2011
Location: bowling green, ky
Posts: 439
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Re: mpg issue
I get 16 mpg hwy..... I'm up to try some things to help it along... 87 silverado long wheel base.. here
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04-14-2011, 01:45 AM
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#10 |
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GoatLube Experss
 
Join Date: Oct 2009
Location: clarksville, Tn.
Posts: 1,337
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Re: mpg issue
I recently replaced the cam in my 454 with a Comp Cams "high energey" 260 duration. went from 10/11 highway to 13/14. well worth the envestment.
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Goat Lube Express, locations in Qalat,Afghanistan & Clarksville, Tn. '87 R30 dually 454/TH400 '85 1/2 ton CCSB '92 S10 350/350 '84 MonteCarlo 383/PG/9"ford '78 Malibu wagon 350/350 '78 Cutlass (project family car) '96 S10 Jimmy (Moma's) |
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04-14-2011, 01:53 AM
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#11 | |
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Registered User
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,188
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Re: mpg issue
Quote:
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