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Author Topic:   Anybody know about a fuel ...
PlumCrazy21
Dirt Roller

Total posts: 14
posted January 17, 2003 05:09 PM
injection system to retrofit on my 85 Chevy 454 Crew cab Dually? I seen a JEG's magazine the other day and it has a multi-port fuel injection system that converts the old Rochester QuaraJet over with stand alone computer system. i don't know anything about auto computers, but its a good ol' truck and pulls the car & traiklr well (4.10 rear gear) , but no gas mileage ( 3 mpg if lucky) and no, I can't afford a brand new Powerstroke Diesel, even though i wish i could. its a Holley Commander 950 cfm kit for $2,200. It wouldn't take too long to get that back if it really doubled the fuel mileage, though. Thanks for any input.

stockcar5
Dirt Full Roller

Total posts: 63
posted January 17, 2003 05:17 PM
if i were you i'd look into getting a injected manifold and computer setup out of a 96 or newer truck or suburban with the 454. i think it will bolt right up and not cost 2000+ $ you will also need a high pressure fuel pump (around 55 psi)

luke

KK17
Dirt Maniac

Total posts: 178
posted January 17, 2003 05:28 PM
putting fuel injection on it doesn't mean that you're gonna gain a lot of mileage....I used to pull with a 79 ford 460 that got 8 mpg pulling a 28' enclosed at highway speeds..upgraded to a powerstroke..went a lot faster but only gained 2 mpg...I've got a friend who bought a new chevy with an 8 litre? gas jobby and only gets about 10 just driving around...454's are notorious for being gas hogs whether injected or not..I'd use your money somewhere else..

ctfarm
Dirt Roller

Total posts: 21
posted January 18, 2003 03:51 PM
Your best bet,would be to go to a 3.73 gear.I've installed one of these injection systems,they don't help fuel mileage.


One87Racing
Dirt Full Roller

Total posts: 61
posted January 18, 2003 09:02 PM
87-95 chevy truck TBI style injection is cheap, easy to install and will help your mileage. You have to run a stock or near stock camshaft as the speed density type injection doesn't like anything too far from stock. Also these systems run at a fairly low pressure (12-15psi). Just check your local wrecking yards for all parts needed to complete the swap (intake with throttle body, fuel lines, distributer, wiring harness, computer), and you can get a inline pump from any parts house that will splice into your factory lines so you don't have to drop the tank. We do a few of these conversions a year, mostly on sbc's, but they do help with driveability and fuel mileage. Hope this helps.

PlumCrazy21
Dirt Roller

Total posts: 14
posted January 21, 2003 10:18 PM
Thanks, ONE87 for the reply and the help. Do I need two in-line fuel pumps for the dual tanks (left & right sides) or just one in front of the splitter valve? Is it very difficult to wire in the computer system to a vehicle that doesn't have a computer? Any help is deeply appreciated.
Thanks, Joe

One87Racing
Dirt Full Roller

Total posts: 61
posted January 22, 2003 11:13 PM
I would run one for each tank just in case the splitter has a slight air leak (air will kill the pump), and you will have to run the corresponding wiring as well. The best way to wire in the FI is to get the complete engine and computer harness with the intake and throttle body. You will then need to get wiring diagrams for both trucks. You will have to find hot leads and grounds from the FI harness and find where to splice them into the harness in your pickup. If I recall correctly, you have a couple hots and a couple grounds you have to hook up, plus fuel pump relay and wiring. It's not terribly complicated, but it is time consuming. You can expect to spend a day digging through harnesses, routing and hooking up wires. Hope this helps.

PlumCrazy21
Dirt Roller

Total posts: 14
posted January 23, 2003 06:29 PM
OK, Thanks a bunch One87. do you think a SBC wiring harness would be compatable with a BBC intake and Throttle Body? I'm just guessing that the junkyards here in TX have a lot of small block stuff and fewer BB engines. That might prove wrong, though.
Thanks again, Joe

One87Racing
Dirt Full Roller

Total posts: 61
posted January 23, 2003 10:39 PM
same here, but the sb computer won't run the bb. you would have less headaches with the bb computer and harness, it's probably more expensive now, but it will save you in the long run.

Donnie Ross
Dirt Maniac

Total posts: 109
posted January 25, 2003 06:44 AM
just a thought it may be possible to use the small block computer and install an after market or big block prom. i 'm only talking wiring and computer as the big block injectors probably have a higher flow rate.of
course like has already been said the best choice is a complete big block set up.

One87Racing
Dirt Full Roller

Total posts: 61
posted January 27, 2003 10:48 PM
We did a FI swap on a 383 in a burb, it took the sb computer and a bb prom from jet to get it to run better, but it didn't run great. It's possible to do it that way, but the end result isn't as desirable as having all the bb stuff.

PlumCrazy21
Dirt Roller

Total posts: 14
posted February 02, 2003 09:37 PM
OK, real stupid question.... what is a "prom"
Is this the "black box" mounted on the fenderwell? Please keep all the suggestions coming. I am really trying to learn about this technology stuff
Thanks, Joe

One87Racing
Dirt Full Roller

Total posts: 61
posted February 05, 2003 04:34 PM
nope, the prom is a little chip located inside the computer housing. it's what you replace when you add a performance "chip" to those trucks.

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