Jump to content


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*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* 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!

Guest Message by DevFuse
 

Photo
- - - - -

would it be a good idea to use a electric supercharger on a ea81?


  • Please log in to reply
13 replies to this topic

#1 beamrverbeek

beamrverbeek

    New User

  • Members
  • Pip
  • 7 posts
  • snohomish wa.

Posted 28 July 2011 - 11:27 AM

Im lookin at gettin some power out of my ea81. i put a weber carb on and made a custom cold air intake system so now i seein if it would be a good idea to supercharg it with in of those electric ones. let me know thanks

#2 soobscript

soobscript

    needs more time

  • Members
  • 705 posts
  • Columbus, OH

Posted 28 July 2011 - 01:00 PM

It's never a good idea to use an electric supercharger.

#3 WoodsWagon

WoodsWagon

    Formerly 91Loyale

  • Members
  • 3,945 posts
  • NH

Posted 28 July 2011 - 10:58 PM

Electric superchargers (real ones) are expensive and require serious amperage to run. They do work for short bursts of acceleration though.

If you put a CAI on your car, you're most likely looking at a boat bilge ventilator fan, repackaged as an "electric s/c" to sell to ricers too dumb to know better. They can't move enough air at any pressure to supercharge an engine. It's a hoax, and you might as well put magnets on your fuel line for an equal performance increase.

You can see real performance gains from a gas powered leaf blower however, and it might fit where the spare tire goes. Kind of a pain to get out and pull start your supercharger every time you need to go fast though.

#4 Uberoo

Uberoo

    Subaru Wheeler

  • Members
  • 3,426 posts
  • lewiston,ID

Posted 29 July 2011 - 01:33 AM

a friend actually got 15 HP on a dyno by plugging in an electric leaf blower and running it into his engine.it used the shop's AC...

#5 el_freddo

el_freddo

    Eat, Live, Breath Subaru

  • Members
  • 516 posts
  • Lancefield, Vic, Aust.

Posted 29 July 2011 - 01:58 AM

Why not try out a toyota SC12 for true supercharging?

You will need to work out how to mount it, plumb it in and make it all work with the carbie. The other issue is the health of your bottom end...

Cheers

Bennie

#6 Dirk

Dirk

    Lazy Perfectionist

  • Members
  • 489 posts
  • Wanaka New Zealand

Posted 29 July 2011 - 05:52 AM

Google smog pump.

Let me know what you think.

#7 WoodsWagon

WoodsWagon

    Formerly 91Loyale

  • Members
  • 3,945 posts
  • NH

Posted 29 July 2011 - 09:35 AM

Smog pumps work for supercharging briggs and strattons, you'd need a whole bunch of them to do anthing on an EA81, and the belts would get complicated.

#8 Flowmastered87GL

Flowmastered87GL

    WCSS Drunk

  • Members
  • 6,126 posts
  • Portland, Oregon

Posted 29 July 2011 - 10:18 PM

If you want more power either swap the engine, or maybe put a delta cam in your EA81. Have you opened up the exhaust yet??

Just a NORMAL EJ22 will almost put out double the stock output of an EA81

#9 Crazyeights

Crazyeights

    SubaRube Goldberg

  • Gold Subscribers
  • 976 posts
  • PNW

Posted 29 July 2011 - 11:02 PM

You can get a surprising amount of torque out of a modified EA81 but I'm not sure it's worth the trouble (EJ swap would probably be less work). Mine turned out very well though. EA81 Solid lifter block, NOS EA71 pistons, Delta torque cam, ported heads-milled .020", each deck milled .005, SPFI conversion modified to run more timing and fuel, NGK plugs with gap increased to .045" 2-wire grounded o2 sensor, ect. I don't have any numbers but it pulls hard from off idle to right up to over 4 grand (would go higher but it's still pretty fresh).

Good Luck!

Edited by Crazyeights, 29 July 2011 - 11:05 PM.


#10 nipper

nipper

    Semi Elite Master of the

  • Members
  • 17,605 posts
  • Long Island NY

Posted 29 July 2011 - 11:02 PM

a friend actually got 15 HP on a dyno by plugging in an electric leaf blower and running it into his engine.it used the shop's AC...

Unless he got it on a dyno, we all have a freind that got something.

A real supercharger will use 10hp to 80 (serious drag monster), You cant afford to use that 10 to just make 20 more.

Especially on an old engine.

Search the net aunder electric supercharger scam and you will see lots of info on it.

If it was possible dont you thjink the car compaines would throw a 20.00 blower on the car instead of a 1000.00 turbo/super charger?

#11 WoodsWagon

WoodsWagon

    Formerly 91Loyale

  • Members
  • 3,945 posts
  • NH

Posted 30 July 2011 - 04:11 AM

If it was possible dont you thjink the car compaines would throw a 20.00 blower on the car instead of a 1000.00 turbo/super charger?


It's the long extension cord that's the problem...

a friend actually got 15 HP on a dyno by plugging in an electric leaf blower and running it into his engine.it used the shop's AC...


That's why you need the gas powered one, more portable.

A leaf blower is a substantially larger fan then the bilge ventilators being sold as "electric superchargers".

#12 Dogbone

Dogbone

    USMB Regular

  • Members
  • PipPipPip
  • 64 posts
  • Charlottesville, VA

Posted 30 July 2011 - 08:10 AM

Mine turned out very well though. EA81 Solid lifter block, NOS EA71 pistons, Delta torque cam, ported heads-milled .020", each deck milled .005, SPFI conversion modified to run more timing and fuel, NGK plugs with gap increased to .045" 2-wire grounded o2 sensor, ect. I don't have any numbers but it pulls hard from off idle to right up to over 4 grand (would go higher but it's still pretty fresh).

Good Luck!


Don't mean to hijack, but do you have a seperate thread going into more detail about your engine? Pics?

I'd love to read and learn more about successful EA builds, I really have very little interest in the whole "just EJ it" thing. No offense to anyone, but I don't offroad or race my Subie, and I like my spare tire and ice cold A/C right where they are. ;)

#13 Crazyeights

Crazyeights

    SubaRube Goldberg

  • Gold Subscribers
  • 976 posts
  • PNW

Posted 30 July 2011 - 02:07 PM

My build was inspired by backwoodsboy's build so I didn't take a lot of pictures. He covered that REALLY well!

Performance EA81 Build

I used GD's SPFI conversion with my own fuel pressure hack to supply a little more fuel. I also enabled EGR by making a .250" spacer for the IAC valve. This seems to reduce cylinder temperature and allow a little more timing. The sweet spot is about 34psi fuel pressure and 28 degrees timing. Getting the valves adjusted was a PITA;

EA81 SPFI

Lastly here is a picture of it right before I dropped it in. It took a some time and LOTS of tweaking before I had it tuned and running the way I wanted it. It has about 5000 miles on it now and runs GREAT! Lots of low end - mid range torque starting right off idle.

EA81 Done

Now, back to the regularly scheduled thread:grin:

Edited by Crazyeights, 30 July 2011 - 05:00 PM.


#14 Uberoo

Uberoo

    Subaru Wheeler

  • Members
  • 3,426 posts
  • lewiston,ID

Posted 30 July 2011 - 08:37 PM

Quote:
Originally Posted by Uberoo
a friend actually got 15 HP on a dyno by plugging in an electric leaf blower and running it into his engine.it used the shop's AC...


Unless he got it on a dyno, we all have a freind that got something.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users