Welcome to Ultimate Subaru Message Board, my lurker friend!
|Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.
We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!
Serving the Subaru Community since May 18th, 1998!
advise on turbo sets on ea81 1800cc motor.
Posted 05 November 2003 - 12:28 PM
Posted 05 November 2003 - 12:54 PM
There's been discussion on turboing a carbureted car off and on for a long time, and recently I've brought it back up...
It doesn't look like it's been done to our subies yet, but I hope to change that. (EA82 engine BTW is overhead cam.)
stock EA81 engine has 8.7:1 CR. the cam probably needs to be changed for something beefier, and a better breathing cam wouldn't hurt either. Then there is springs, and the rest of the drivetrain.
As far as parts, Ramengines.com has parts listed for this engine for the airplane crowd, but it's expensive. Do a search of the forums to find more manufacturers of stuff.
The EA81T engine has 7.7:1 CR, so you could grab those pistons if you needed to. Or put pistons in from a EA71 (1.6L) and raise it to 9.5:1. There already is a man with an EA82 that has pistons from an EA82 SPFI block in there. (9.5:1 for the EA82) and hasn't had much trouble with his car.
As far as carb'd turbos... I say do it, I'm going to try in time if $$$ permits.
PS: no '84 subaru has AWD. not unless it's been transplanted there from an EA82 RX, XT6, or Loyale. It's most likely 4WD or possibly FT4WD, but that would also have to come from a different model later year'd car. It's definately either FWD or 4WD if it's stock.
Posted 05 November 2003 - 01:12 PM
and were can i find an lsd for both rear and front diff.
Posted 05 November 2003 - 01:16 PM
so im guess that the duel over head cam from a ea82 will not fit on a ea81. and you cant swap the motors because of the bolt pattern.
EA82 doesn't have dual OHC. And yes, the motors can be swapped.. but it isn't a direct bolt in.
Where in texas are you?
Posted 05 November 2003 - 01:23 PM
Posted 05 November 2003 - 01:56 PM
The EA82 into EA81 body is a little hard depending on the car, because the engine compartment may need some work to fit it in.
as far as rods and cranks, you can change the rods and pistons out for ones from an EA71 (1600cc engine) and get more compression ratio, but I haven't ever seen anything on different cranks.
Theoretically, you could turbo those carbs. They're good carbs, but I don't know of anybody with DCOEs on their sube. DG and DF (DGAV, DGEV, DFAV, DFEV) 32/36 carb swap is common.
Posted 05 November 2003 - 02:13 PM
I have used that carb on a draw through turbo sys. before with good results on an air cooled VW T1 engine, so I don't know why U couldn't use it. The turbo exaust man. from a stock Subaru turbo from '83 or '84(EA81) to '91(EA82) WILL fit that engine, as will the down pipe.
I would go the wrecking yards and find a stock turbo Subaru and get the turbo, exaust man, the aluminum intake to turbo pipe, and the oil and water(if so equipt) lines.
Posted 05 November 2003 - 08:55 PM
Posted 05 November 2003 - 10:19 PM
At least once a week someone asks about this - to date, no one has done it (for a car). There's a reason. I bet you can guess what it is.
Posted 05 November 2003 - 10:53 PM
I only disagree with one thing:
there are SOOOOO many EA82T's out there in the JY's
This isn't the NW rick.. we don't have Turbo soobs falling out of our asses down here.. trust me.. I have looked(eww)
There a few SPFI and carb cars..
and very few EA81 and earlier cars..
Soobs just aren't plentiful here.. Thats bad, because it makes it hard to find parts. But its good because you don't have competition from 3/4 of the board when you do find something
Posted 05 November 2003 - 11:27 PM
Too bad they aren't poular down there, but I don't suppose you have much snow or wet weather either - probably why you don't see a lot of them. (the older ones anyway)
Posted 06 November 2003 - 11:06 PM
Posted 07 November 2003 - 12:29 AM
i dont know why you brought up this post comes up every week. i dont know i guess you just had to bring that in. but you should also since this is a forum people go there for help and if all they are going to get is bull**** about this and that then that is a really sorry forum
Perhaps this was a backhanded way of suggesting you use the search function of the forum, that way you would be armed with as much info as possible before you started asking questions.
if the ea81t is so much better to turbo then i will go find one and swap it out
The EA81T is not so much better to turbo.. it is turbo'd.. (thus the T in its designation)
i was told that the ea82 will not bolt up and due to the fact i dont have a lot of the machines to make my own adaptors and what not im am limited to what i can make.
Whoever is giving you info about soobs has absolutely no idea what they are talking about and should stick with hondas(or what ever)
i just want to know what will it take to get a ea81t motor a solid turboed block. for the carbs i have a set of weber dcoes
As stated above, the EA81T is a turbo motor already(Thus the T in the designation).. There will be no need to carb it.. it is an EA81 with Multi point fuel injection and a turbo.. just get the ECU and wiring harness and bolt it in.
Posted 07 November 2003 - 01:46 AM
I'm not giving you bullsh!t, I'm just telling you that you are wasting your time and money trying to turbo a carbed EA81 that was never meant for it. It is my opinion - please treat it as such. And please don't compare soobs to civics - they are competely different - they have little more in common besides being 4 cylinder passenger cars.
You CAN bolt an EA82 to your car - in fact it's so easy it's almost pathetic. There will be about 1/2" between the cam covers and your frame rails - you don't even need to cut, it's just a drop in conversion, using the same engine mounts, and just a mix/match of clutch components. This goes for the EA82T (Turbo version) as well.
If you really want to turbo a carb - go ahead, but please start with an EA82 turbo block. It's built for it already. Make yourself a custom intake for it to mount those side drafts, and go to town. Trying to use an EA81 would be a waste of your money as you would have to completely redesign the entire motor. The EA82T block is already running boost friendly components, and has the correct compression ratio for boosting. Not to mention the overhead cams.
I agree that it's cool to learn new things. I don't personally feel that turboing a carb is worth the trouble, as it's really just as easy to run a small supercharger with a carb, and you'll get more power, and easier tuning. The Turbo is really meant for MPFI. If your going to the trouble of manufacturing manifolds, why not do it right, and go with a blower?
Oh - and Caleb - "Just bolting in" the EA81T (if you can find one) sounds simpler than it really is...... You really need the whole front clip of the car for that conversion....... Just sent one to John (Mudrat) so he can build a turbo Brat :-)
Posted 07 November 2003 - 06:17 AM
and were can i find an lsd for both rear and front diff.
you can get a stock LSD for the rear from an RX but you'll have to change out the front diff as well. Unfortunatly, there is no LSD for the front and so it'll always be an open diff. But good luck in finding a rear LSD because a lot of the people on the board go and grab these as soon as they hit the yard
Posted 07 November 2003 - 06:52 AM
I'm the dude with 9.5:1 turbo.
Posted 07 November 2003 - 10:36 AM
"As stated above, the EA81T is a turbo motor already(Thus the T in the designation).. There will be no need to carb it.. it is an EA81 with Multi point fuel injection and a turbo.. just get the ECU and wiring harness and bolt it in."
so the ea81t came with fuel injection. i didnt know that. but the ea81t will not just slip in it? and what cars came with the ea82t. thanks for information
Posted 07 November 2003 - 11:43 AM
The EA82T was offered starting in 1985, and can be found in a wide variety of cars. I think they were at least an option in the entire lineup of ea82 body style cars up through the early 90's, but I am not certain of that.
Posted 07 November 2003 - 01:22 PM
It will bolt to the trans, but that is about the only thing it will bolt to. You'll want the whole car for an EA81T conversion.
The engine is so rare, that even finding replacement parts is nearly impossible, so it really isn't such a good choice.
The EA82T came in cars from 85 to 91 (?) here in the states. Tons of them out there in the yards for cheap - replacement parts are easy to get.
Oh - and the LSD's were 3.7 - you have to convert them to 3.9 using a ring gear from a normal rear end. There's a bit of grinding and fitting involved, but it will go in. The company he refers to is Phantom Grip I belive that does the front diffs.
Posted 07 November 2003 - 01:30 PM
Posted 07 November 2003 - 01:49 PM
It's the stroke - the bore sizes are the same. You can use EA71 pistons and rods in an EA81 to increase compression.
Posted 07 November 2003 - 04:55 PM
A lot of this I got from helping some friends that owned Caprice turbo's, this was a 2.3 turbo with a carb, the carb is a draw through, so the carb sits before the turbo, it can be done, it's just a matter of how time do you want to put into it. I really don't have a good candidate any more, cause 3 outa my 4 vehicles are already fuel injected, and the 4th is a restoration project, it's going to be all stock.
P.S: I would really like to see some of my idea's put to work, I know that I can't do everything that I come up with, so I'm presenting my designs for others to use. If someone can test em out for me, that makes me more confident in all my work.
P.S.S: Tony, the pistons in the EA81T are NOT forged. I have one that you have to check out, it's pretty bad, it has one of the ring lands between the top and bottom compression rings snapped off. They are definatly cast.
Posted 07 November 2003 - 07:18 PM
edit: Some GL models came with Turbo too, mainly wagons. Ive never seen/heard of a GL sedan or ANY DL with EA82T.
Id go with the EA82T, and not the EA81T. More parts.
Posted 08 November 2003 - 01:37 AM
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users