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07-24-2007, 12:31 PM | #1 |
Just need a couple more parts.
Join Date: Jan 2005
Location: Calgary, Alberta, Canada
Posts: 470
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Happy Happy -New TBI mileage
Just had a new crate 350 motor (TBI) and a 700R4 tranny put into my 72 Blazer. Also a transfer case replacement with a rebuilt early 90s style t-case.
No pictures, too busy driven her. The mileage was at 12 mpg max. with the old 350/T350 -250 tcase. New TBI got me 18.5 mpg (combination highway and foothills gravel gas plant roads). Had a bikini top on the whole time - wonder if that helps a bit?? Very Happpppppy.
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--------------------------------------------------- 1947 Studebaker M5 project to match the camping trailer. 1950 Chev 4x4 Pickup 1958 Shasta Airflyte Travel trailer (fresh restoration) 1971 C/10 Pickup(Frame off Restoration) 1972 K5 Blazer CST (Daily Driver & My Company Truck) 1976 Honda CB750 Bobber 1988 Jaguar XJ12 |
07-24-2007, 01:07 PM | #2 |
Senior Member
Join Date: Aug 2005
Location: OKC, OK
Posts: 2,365
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Re: Happy Happy -New TBI mileage
What gears in the rear and what size tires? I will be happy if I get around the same
Mike
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Mike Redpath |
07-24-2007, 04:25 PM | #3 |
Just need a couple more parts.
Join Date: Jan 2005
Location: Calgary, Alberta, Canada
Posts: 470
|
Re: Happy Happy -New TBI mileage
3.73 gear ratio and 30" tires.
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--------------------------------------------------- 1947 Studebaker M5 project to match the camping trailer. 1950 Chev 4x4 Pickup 1958 Shasta Airflyte Travel trailer (fresh restoration) 1971 C/10 Pickup(Frame off Restoration) 1972 K5 Blazer CST (Daily Driver & My Company Truck) 1976 Honda CB750 Bobber 1988 Jaguar XJ12 |
07-24-2007, 05:02 PM | #4 |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: Happy Happy -New TBI mileage
Not to mention the better power/throttle feel.
Better starts, no more dieseling...always a good mod! |
07-25-2007, 02:10 PM | #5 |
Blazerless
Join Date: Nov 2006
Location: Kelowna, BC, Canada
Posts: 274
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Re: Happy Happy -New TBI mileage
Vince,
Congrats on getting the K5 back on the road! I knew you'd like the drivtrain swap. Mine had similar results, went from 9mpg to 18mpg, but my stock drivetrain was pretty worn out. Enjoy the new mileage and driveabilty
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72' K5 Blazer 4x4 350TBI/700R4/NP205 3/4 ton diffs. Daily driver. SOLD 69' Beaumont 388/700R4 11.70@116 77' Bronco, Wife's mall cruiser/poser 4x4. Capable but too pretty to go offroad. |
07-25-2007, 06:40 PM | #6 |
Senior Member
Join Date: Jul 2005
Location: Winters Ca. 95694
Posts: 4,843
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Re: Happy Happy -New TBI mileage
That is great I am glad you like the results. I for one have EFI of one form or another on everything I build (except Low Buck for now) and love it. I can't wait to slap in a 6.0 and AOD into Low Buck one day soon. Even on a tired motor if you pull the carb and drop on a simple TBI system it really wakes it up. In my 71 SWB I hope to get in th elow 20's with my set up but I have awhile to before I will find out
Kevin LFD Inc. |
07-29-2007, 06:06 PM | #7 |
Registered User
Join Date: Dec 2003
Location: Houston, TX
Posts: 734
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Re: Happy Happy -New TBI mileage
373 rear+ 35" tires+ 383 stoker+ 700r4+ Holley ProJection TBI= 9.16mpg uphill, downhill, headwind, tailwind, trailer and without. BUT I have 400+ hp... Maybe I should sell the drivtrain and try something else?
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'72 K5, known as 'the Fox.' |
07-29-2007, 10:15 PM | #8 |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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Re: Happy Happy -New TBI mileage
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
07-29-2007, 10:28 PM | #9 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Re: Happy Happy -New TBI mileage
How much does the engine setup cost to go TBI? I wouldn't mind getting that mileage in my truck.
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
07-30-2007, 10:14 AM | #10 |
Just need a couple more parts.
Join Date: Jan 2005
Location: Calgary, Alberta, Canada
Posts: 470
|
Re: Happy Happy -New TBI mileage
I am not the right guy to answer this as I had a newer style transfer case installed also which took abit of modification time and I did not have time to do it my self and paid someone to do all of it. Some of the other members would probably have a better price guideline.
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--------------------------------------------------- 1947 Studebaker M5 project to match the camping trailer. 1950 Chev 4x4 Pickup 1958 Shasta Airflyte Travel trailer (fresh restoration) 1971 C/10 Pickup(Frame off Restoration) 1972 K5 Blazer CST (Daily Driver & My Company Truck) 1976 Honda CB750 Bobber 1988 Jaguar XJ12 |
07-31-2007, 02:11 PM | #11 |
Blazerless
Join Date: Nov 2006
Location: Kelowna, BC, Canada
Posts: 274
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Re: Happy Happy -New TBI mileage
Here's a breakdown of the costs for my TBI swap (Cdn $):
Used '92 TBI 350 = $800 (complete with all accesories and sensors/computer) Rebuilt 700R4 tranny = $1200 AA short output shaft = $300 TBI wiring harness = $600 (c/w speedo cable to VSS adapter) 90 Blazer fuel tank = $200 (new aftermarket) Fuel pump = $75 (new from GM) Those are all the major components figure on another $500 for assorted stuff (hoses fittings etc.) and it comes out to $3675.00. I actually spent closer to $5000, but I upgraded to 3/4 ton at the same time. The cost will also depend on what you can find used, or free. VtBlazer might chime in, IIRC he bought a complete running '88 Blazer and swapped everything over. Pricy, but for me it was worth it.
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72' K5 Blazer 4x4 350TBI/700R4/NP205 3/4 ton diffs. Daily driver. SOLD 69' Beaumont 388/700R4 11.70@116 77' Bronco, Wife's mall cruiser/poser 4x4. Capable but too pretty to go offroad. |
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