EA81 MPFI theory...

Subydoug · Post by **Subydoug** » Fri Jul 05, 2013 9:03 am

Yeah, aircraft run two plugs for safety reasons mostly. Your chances of meeting death are a lot lower in a car when you lose spark

. Best spark upgrade you could do would be piss off the points, lock the disty fixed, stick a timing wheel inside it, maybe from an ea82 4 plug, and run a system like megajolt. Programmable ignition, throw on a knock sensor and bob's your mothers brother. Base ignition curve is in the EA81 factory manual. No rotor cap/rotor to get crusty. Run a quality brand and slightly overkill coil, It'll tear your arms outa your sockets

.

Regards

Doug

steptoe · Post by **steptoe** » Fri Jul 05, 2013 8:22 pm

Anyone remember the car mags editors who were about all you could ask for advice - and the replies to be got? They never sounded like Subydougs there ^^^above.

"Dear Sir, I am the proud owner of an 84 Subaru Brumby with the EA81 engine. I hear they have soft cams, so that explains the tick,tick noise. I want more power, just double will do, so can you recommend a twin turbo set up and someone to do the work - within my $900 budget"

Signed, Teararse Tommy

Subydoug · Post by **Subydoug** » Fri Jul 05, 2013 11:19 pm

Hehehe, ok so maybe flame propagation is slightly better with the two plugs, but really? you aint gonna see it unless your reading micro-watts on a dyno

.

Another good option is CDI units. Don't think it would be too hard to get something working on our subies and they can give a pretty potent spark.

Anyway back onto the matter at hand, Bennie, whats the latest? all mounted up? down to the dyno next Wednesday? no pressure mate

.

Gonna be messing around with making some manifold's soon, so if I get something that actually looks good Il make you one up with injector bosses in it

. Just some tweaking on the ea82 ecu and we'll be laughing like large rats!

Regards

Doug

YouTube · Post by **El_Freddo** » Sun Jul 07, 2013 1:21 pm

Subydoug wrote:Anyway back onto the matter at hand, Bennie, whats the latest? all mounted up? down to the dyno next Wednesday? no pressure mate .

Not much, just more research and a bit of a game plan as to how I'm going to go about the injector mounts. I hope it all works.

Subydoug wrote:Gonna be messing around with making some manifold's soon, so if I get something that actually looks good Il make you one up with injector bosses in it . Just some tweaking on the ea82 ecu and we'll be laughing like large rats!

That'd be good mate. Hopefully I'll beat you to the punch - I still want to try out my way anyway. The other thing I'm looking at doing is trying to make it look stock and retain the PS and AC at the same time - I think this is going to be tricky to fit the injectors and still be clear of the PS and AC pump/compressor using the EA81 system - so I've been looking into doing an EA82 auxiliary setup on the EA81 like the EA81T's have.

Just need to get Sunnie the Brumby done and on his way, then I'll be able to focus on the heads and a block while working on stripping the wiring down - without a diagram... Should be good.

Cheers

Bennie

Post by **TOONGA** » Sun Jul 07, 2013 1:44 pm

El_Freddo wrote:...then I'll be able to focus on the heads and a block while working on stripping the wiring down - without a diagram... Should be good.

Cheers

Bennie

Bennie this pdf at http://jdmfsm.info/Auto/Japan/Subaru/--Old%20Models--/

1988 Subaru XT Service Manual.pdf

or this pdf

Subaru Loyale Leone EA 82 Service Manual 1989.pdf

or this pdf

EA82_-_Service_Manual_Part_2_of_2.pdf

will help you along the way both have the MPFI wiring diagram and the second one has the SPFI wiring diagram as well.

you need to go to the page as the links won't redirect properly

TOONGA

YouTube · Post by **El_Freddo** » Sat Jul 13, 2013 4:26 pm

Thanks Jules,

I'm having issues loading the manuals after I click on the link in the directory page - it just takes ages and doesn't get anywhere!

Cheers

Bennie