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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: 2,364
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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: 8,537
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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. |
07-26-2007, 05:10 PM | #7 |
urban fourwheelin
Join Date: Aug 2002
Location: Seattle
Posts: 1,007
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Re: Happy Happy -New TBI mileage
Is this swap really that easy?
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1972 K5 Blazer with Cummins 4BT, NV4500 swap in the parts gathering stage. |
07-27-2007, 07:17 AM | #8 |
Registered User
Join Date: May 2005
Location: Tallahassee Fl
Posts: 773
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Re: Happy Happy -New TBI mileage
What is the shortest path to finish this??? I have TBI, Intake, computer and even a pair of intank pumps. What is the minimum needed to get up and going????
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07-27-2007, 12:15 PM | #9 |
Just need a couple more parts.
Join Date: Jan 2005
Location: Calgary, Alberta, Canada
Posts: 470
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Re: Happy Happy -New TBI mileage
The swap was real easy. I just dropped the blazer and a whole lot of money off at my buddies and then kept working to pay for it. Some times it is better to keep working at what you are good at and pay someone else to do what they are good at.
I think Chris did a FAQ on what was needed to do this swap. Also, try this http://www.persh.org/Pickup/TBI-1.htm
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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 |
07-27-2007, 07:26 PM | #10 |
Registered User
Join Date: Jan 2005
Location: Colorado Springs
Posts: 693
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Re: Happy Happy -New TBI mileage
I did the TBI conversion, it's easy and I love the turn key driveability. I didn't get much of a MPG improvement but I have a TH350 3.73's and 33" tires and my engine build is a .040 350 with L-98 iron cylinder heads comp cam and it's chipped. It runs well but 11.9 city 12.4 HWY is it.
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1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's 1970 K5 TBI conversion lifted etc SOLD 1968 C20 camper truck SOLD “To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder |
07-29-2007, 12:31 PM | #11 |
Senior Member
Join Date: Nov 2003
Location: Calgary Alberta
Posts: 1,936
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Re: Happy Happy -New TBI mileage
Hey Vince, got her done!!!!!!!!!! I bet its a little nicer than the carb you had on there.. What else do you have for performance stuff? You be able to suck out a few more MPG if you put a few performance goodies on there. Good exhaust, headers, filters, and electric fans, and of course get that computer tuned just right. You should be able to get it ove 20, if you drive it decent, BUT I would take 18.5 anyday..
Call me when you ghave a chance, Darren
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67- 72 Parts collecter |
07-29-2007, 06:06 PM | #12 |
Registered User
Join Date: Dec 2003
Location: Houston, TX
Posts: 733
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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 | #13 |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,468
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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 | #14 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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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 | #15 |
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 | #16 |
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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