TBI replacing carb - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 07-08-2008, 04:21 AM   #1
Registered Member
 
Join Date: Jul 2008
Posts: 2
Country: United States
TBI replacing carb

Has anyone fitted throttle body fuel injection on an 70s chevy V8? My truck guzzles fuel and I'dd like to ditch the carburator. It's not funny, maybe 8 mpg
__________________

cirjerry is offline   Reply With Quote
Old 07-08-2008, 04:32 AM   #2
Registered Member
 
GasSavers_BEEF's Avatar
 
Join Date: Apr 2008
Posts: 1,831
first of all, I know it isn't a V8 but my buddy is fuel injecting his chevette with a system called mega squirt. it is a very indepth system that you build yourself. he just got the kit and says it will take him about a month to put on because he needs to find other random bits to use like the throttle body, sensors, high pressure fuel pump. he already has another gas tank.

he is trying to make it to where there is not downtime with the car when he does the change over. he his hoping for more power and better FE.

I'll talk to him about the system and ask him what is different if it is done on a V8 vs his 4.
__________________

__________________
Be the change you wish to see in the world
--Mahatma Gandhi



GasSavers_BEEF is offline   Reply With Quote
Old 07-08-2008, 05:31 AM   #3
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
Quote:
Originally Posted by cirjerry View Post
Has anyone fitted throttle body fuel injection on an 70s chevy V8? My truck guzzles fuel and I'dd like to ditch the carburator. It's not funny, maybe 8 mpg
What type of 70's V8 Chevy truck are you talking about? With some relatively minor mods I was able to get my old 1974 Chevy C-10 pickup with a 350 V-8, Turbo 350 automatic tranny, and a Rochester Quadrajet carb turning almost 30 on the highway (with the a/c on!!!). They were great because they didn't have all the emissions crap on the engines to reduce mileage.

Here's the mods I made on my old truck:

Added cruise control

I flipped the bonnet on the air cleaner upside down so the engine can breathe easier.

I replaced the points type distributor with an electronic one from a 1980 Chevy truck with a 350 V-8 (from junkyard)

Switched to Platinum spark plugs, and increased spark plug gap when I switched to electronic distributor.

Even with over 300,000 miles on it that truck ran great, got great mileage when I was kind to the accelerator, but when you wanted to move in a hurry that thing would nail you in the back of your seat.

-Jay
__________________






Jay2TheRescue is offline   Reply With Quote
Old 07-08-2008, 06:25 AM   #4
Site Team
 
Join Date: Dec 2006
Posts: 656
Country: United States
I put a Holley Projection on my Buick 455 back in 1992. The worst part was the extra fuel lines- my original car didn't have a return line, and the supply line was too small. So I put in a new 3/8" supply line and 5/16" return line.

For me, the wiring part wasn't too bad, but I'm better at wiring than at plumbing.

-Bob C.
__________________
Think you are saving gas? Prove it by starting a Gas Log, then conduct a proper experiment.
bobc455 is offline   Reply With Quote
Old 07-08-2008, 06:41 AM   #5
Registered Member
 
Join Date: Oct 2005
Posts: 682
Country: United States
Quote:
Originally Posted by cirjerry View Post
Has anyone fitted throttle body fuel injection on an 70s chevy V8? My truck guzzles fuel and I'dd like to ditch the carburator. It's not funny, maybe 8 mpg
With mileage that bad, I'd look for something obvious, like a stuck choke. A stuck choke will make a truck gulp fuel like crazy.

You didn't say how big the engine is, or what the axle ratio is. A complete motor or axle swap might be easier than trying to modify an engine.
__________________
Capitalism: The cream rises. Socialism: The scum rises.
Sludgy is offline   Reply With Quote
Old 07-08-2008, 06:57 AM   #6
Registered Member
 
GasSavers_RoadWarrior's Avatar
 
Join Date: Feb 2008
Posts: 1,652
Quote:
Originally Posted by Sludgy View Post
With mileage that bad, I'd look for something obvious, like a stuck choke. A stuck choke will make a truck gulp fuel like crazy.
No kidding, I had a 1.3L car with an auto choke that screwed up, it got 25mpg, then I ripped the auto out and put a manual kit on it and got 35mpg.... then I later has some other issues with that carb and replaced it with a very low miles original carb, with the auto choke intact, and that got me 40mpg.
__________________
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
GasSavers_RoadWarrior is offline   Reply With Quote
Old 07-08-2008, 07:33 AM   #7
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
Quote:
Originally Posted by RoadWarrior View Post
No kidding, I had a 1.3L car with an auto choke that screwed up, it got 25mpg, then I ripped the auto out and put a manual kit on it and got 35mpg.... then I later has some other issues with that carb and replaced it with a very low miles original carb, with the auto choke intact, and that got me 40mpg.
The auto choke on my 74 chevy was real simple. It was a flat, coiled spring bolted to the intake manifold. The spring would expand and contract with the temperature of the manifold, shutting off the choke when the engine warmed up. Adjustments were easy, I just bent the pushrod connecting the choke to the spring. Check your spring and see if it isn't broken from age... Should be a cheap, easy repair if its broken.

-Jay
__________________






Jay2TheRescue is offline   Reply With Quote
Old 07-08-2008, 08:26 AM   #8
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
I would love to convert my 1980 Buick to TBI, but the more I learn, the more I think the project is beyond my ability and budget. Apparently it can be done pretty reasonably with junkyard TBI parts from a Chevy Astro. However, I think it requires a pressurized fuel system, return lines, etc...
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 07-08-2008, 08:41 AM   #9
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
Quote:
Originally Posted by theholycow View Post
I would love to convert my 1980 Buick to TBI, but the more I learn, the more I think the project is beyond my ability and budget. Apparently it can be done pretty reasonably with junkyard TBI parts from a Chevy Astro. However, I think it requires a pressurized fuel system, return lines, etc...
I would like to do it to my 81 Regal as well, but to do it right I think I would have to start with a decent parts car.

-Jay
__________________






Jay2TheRescue is offline   Reply With Quote
Old 07-08-2008, 10:23 AM   #10
Registered Member
 
Join Date: Nov 2007
Posts: 102
Country: United States
Take the TBI stuff off of an 88-93 Chevy or GMC truck. My 89 Chevy was TBI. I believe they ran it until 93, give or take a year. Pretty basic, and fuel pressure is not very much, like 15 tops I think. Taking everything you need off of one of those trucks from the intake manifold up. Take the wiring harness and computer also.
__________________

froggy81500 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY Chevy Avalanche conversion to parallel hybrid MetroMPG Hybrid Vehicles 2 11-13-2007 09:43 AM
Saturn SL Occasional grind into fifth Fourthbean General Maintenance and Repair 13 10-03-2007 06:34 AM
Another brick!! Raccoonjoe Introduce Yourself - New member Welcome 4 06-01-2007 05:17 AM
hi all lunarhighway Introduce Yourself - New member Welcome 7 12-28-2006 12:56 PM
Honda Soltec tomauto Electric and Solar powered 2 12-01-2006 10:47 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 12:57 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.