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Carb to EFI conversions


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44 replies to this topic

#1 swervey87gl

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Posted 13 January 2005 - 05:43 PM

I have a stock 87 gl that is carburated. Carbs suck. I was wondering if its even possible, if so what I need to convert it. Has any one done it effectively and how did it work.

#2 Snowman

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Posted 13 January 2005 - 06:01 PM

Converting to the factory SPFI system is REALLY easy. I recently finished a manual detailing the conversion. Hush777 has scanned it, and it should be posted in the USRM SOON!

I did the conversion in two days the first time, and I'll never go back. Drivability, power, and economy are all improved over the stock carb, and compared to the Weber I was running, drivability is WAY better and economy is significantly improved. If you've either got access to a good junkyard or you can get an EFI parts car, the conversion is inexpensive. It cost me less than when I converted to the Weber carb last year.

#3 phishy75

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Posted 13 January 2005 - 06:40 PM

I recently finished a manual detailing the conversion. Hush777 has scanned it, and it should be posted in the USRM SOON!


Be sure to post here when you post it in the USRM so we know!!!:headbang:
I'm itchin to do it myself.

#4 torxxx

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Posted 13 January 2005 - 10:39 PM

same here.. I've had it with my carb.. I solved icing problem, but I'm only gettin 15 mpg..

#5 phishy75

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Posted 14 January 2005 - 02:13 AM

same here.. I've had it with my carb.. I solved icing problem, but I'm only gettin 15 mpg..


OUCH:slobber: I thought I was doin bad with 20 city and 25 hwy. Mind you my foot is pretty heavy:brow:

#6 Alf

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Posted 14 January 2005 - 02:20 AM

Hmm... I've just measured, I'm getting 32 mpg (not mistyped!) on highway with factory original Hitachi carb... I'll wait a little with the efi conversion. :)

#7 ballitch

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Posted 14 January 2005 - 02:53 AM

you're going to wait for 10 horsepower to just waltz up to you and smack you in the face or something? not to mention I hate carbs and have no reason to because mine never failed me and got 30 highway and 24 city, that was with 86 gl and hicrappy.




~Josh~

#8 Alexx

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Posted 14 January 2005 - 03:08 AM

SPFI stands for??? (I assume the FI is Fuel Injection?)

I wanted to do the same on my 81 subaru and all I got was fear from the people I asked. Sensors have to be put in a bunch of spots and the claim was the car could just shut off and not work while one was driving on the freeway.

#9 Alf

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Posted 14 January 2005 - 03:10 AM

Sequetial Port Fuel Injection I assume...

#10 rallyruss

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Posted 14 January 2005 - 03:10 AM

do it!

yeah dump the carb. EFI is the only way to fly. I hated the carb on my gutless old 85 GL. If I knew more at that time I may have kept it and converted it.
I have seen enough webers and delortos from the Days of VW tuning. I knew EFI was for me when I as a rookie fixed a fuel injected square back after many carb lovin VW guys had looked at it and failed.

#11 GLCraig

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Posted 14 January 2005 - 03:14 AM

Sequetial Port Fuel Injection I assume...


Nope it's Single Point Fuel Injection also know as throttle body injection. Subarus didn't get sequential until the EJXX engines came out.

#12 Alexx

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Posted 14 January 2005 - 03:26 AM

I kind of think it could be a really cool "cottage industry" to offer fuel injection make-overs for carbed cars. I would gladly spend the bucks. I would slowly get the money back over time with increased fuel economy and I'm saving money driving an older car anyway, I'd love to have the choice.

I talked to a subaru repair shop, both dealer and non-dealer, and they showed visible disdain at the idea of doing a fuel injection conversion.

#13 Alexx

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Posted 14 January 2005 - 03:29 AM

Maybe that would make an interesting new board, carb to fuel injection makeovers.

#14 hush777

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Posted 14 January 2005 - 03:30 AM

I have collected all the parts and pieces to do the conversion on a 86 sedan but not sure that I'm gonna do it as the car is for my niece and she won't care either way.....

And I just got a car with a decent carb on it for the car....
And a 85 gl-10 turbo wagon:brow:

I like the SPFI system, have several cars with them on it.

Hush

#15 rallyruss

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Posted 14 January 2005 - 03:42 AM

I kind of think it could be a really cool "cottage industry" to offer fuel injection make-overs for carbed cars. I would gladly spend the bucks. I would slowly get the money back over time with increased fuel economy and I'm saving money driving an older car anyway, I'd love to have the choice.

I talked to a subaru repair shop, both dealer and non-dealer, and they showed visible disdain at the idea of doing a fuel injection conversion.


I would do it.:brow:
spfi is the most simpe type of efi out there. I have gone thru worse EFI coversions before.
how much do you want to spend $$$???

#16 Alf

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Posted 14 January 2005 - 03:46 AM

Nope it's Single Point Fuel Injection also know as throttle body injection. Subarus didn't get sequential until the EJXX engines came out.



Ooops, sorry, and thanks for correction. :o

#17 MorganM

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Posted 14 January 2005 - 09:57 AM

Sequetial Port Fuel Injection I assume...

Single Point (port?) Fuel Injection

aka: TBI Throttle Body Injection (what all the GM duders call it cuz thats what GM called their SPFI)

Just has one fuel injector in the middle of your throttle body.

MPFI: Multi Point Fuel Injection
Has an injector at each cylinder.

EA82 came with carb, SPFI, MPFI, or MPFI turbo... pick yar poison !_!

#18 phishy75

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Posted 14 January 2005 - 01:02 PM

So how tough is it and what do you need?
Of course you need the throttle body, intake manifold & air box. What else, and what about electronics and all the vacuum hoses on the carb?
Just tryin to get an idea before the "how to" post come out.

#19 hush777

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Posted 14 January 2005 - 02:39 PM

Here is a link to the Conversion manual.:)

http://hush777.web10...sion Manual.zip

Thanks to Snowman for putting this all together for us.


Also a link to the article in the USRM.

http://www.ultimates...rticle.php?a=61

Hush

#20 Snowman

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Posted 14 January 2005 - 02:59 PM

SPFI stands for??? (I assume the FI is Fuel Injection?)

I wanted to do the same on my 81 subaru and all I got was fear from the people I asked. Sensors have to be put in a bunch of spots and the claim was the car could just shut off and not work while one was driving on the freeway.


Hmmm, that's interesting. Mine hasn't shut off yet after several thousand miles of driving, and I only had to add/connect two sensors outside of what was contained in the disty and intake setup. (Only one of those sensors was an absolute requirement for it to run.)

EA82 cars: it's a cakewalk
EA81 cars: you have to modify the disty a little
EA71 cars: quite a lot of work because the intake manifold won't cross over.

And yes, the stock Hitachi carb, when it's in good shape, is great as far as fuel economy is concerned, but SPFI has better drivability and more power.

#21 Snowman

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Posted 14 January 2005 - 03:00 PM

I talked to a subaru repair shop, both dealer and non-dealer, and they showed visible disdain at the idea of doing a fuel injection conversion.

That's because they're wussies!

Voodoo Engineering baby!:drunk:

#22 MorganM

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Posted 14 January 2005 - 03:47 PM

That's because they're wussies!

Voodoo Engineering baby!:drunk:

Yeah dealerships rarley give you respect for doing anything cool on old disposable cars. I usually get a big sigh, eye roll, and piss poor service at local Subaru stealerships. :rolleyes:

#23 torxxx

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Posted 14 January 2005 - 06:30 PM

morganm - sounds just like the dealers up here.. bunch of idiots at the dealer here too.. I went in and asked the head service guy if he knew anything about making a 3.9 rear end into a LSD 3.9. He said no, why in the hell would you want to do something like that..
hahahahahaa stupid people make stupid babies, and then their babies make more stupid babies with other stupid people.... spreads like a virus

#24 Sweet82

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Posted 14 January 2005 - 06:49 PM

Now you have my attention...:rolleyes:

So how much did it cost to convert the carb to injection? :confused:

My Buggy runs sweet and I'd hate to mess with it but having the ablility to re-start the engine on unimaginable angles would be a real plus :grin:

....Humm$$$$....
Glenn
82 SubaruHummer---been there done that on steep stuff with a carb.
01 Forester---geared such that it wouldn't matter it it was carbed :lol:

#25 swervey87gl

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Posted 14 January 2005 - 06:51 PM

Well by popular demand I will be converting it soon. When I go to the junkyard besides the efi unit istself what are some other things I should look for, harness, computer ect




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