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Supercharger


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42 replies to this topic

#1 WJM

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Posted 29 May 2005 - 09:56 PM

seriously considering junking the turbo...and going supercharging.

Yes yes...i know that turbo is more efficient than super...but super has not lag, and for autox...super is better in alot of cases.

After driving a near bone stock 2.5 RS today, and severely beating down a nearly stock STi and other turbo cars...im thinking about it more.

has anyone actually succesfully SC'd an EA engine or ER? ive seen pics of an ER27...but...does it run?

#2 NorthWet

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Posted 29 May 2005 - 11:21 PM

...i know that turbo is more efficient than super...but super has not lag, and for autox...super is better in alot of cases.

Turbo-superchargers are not significantly more efficient than mechanically driven superchargers, especially in an autox type of usage. And lag is not specific to turbos: A mechanically driven centrifugal supercharger (eg Paxton) would also exhibit lag.

Go ahead and give it a try.

#3 TheSubaruJunkie

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Posted 30 May 2005 - 12:25 AM

A dude by the name of Douglas Vincent has a supercharged Legacy Wagon in washington. I met him at the WCSS and spoke to him a little on the legacy board. he's the one who bought my AWIC and he has it in use on the supercharged EJ22.

he's done alot of fabbing and testing to get it almost right. look him up on bbs.legacycentral.org

-Brian

#4 Ross

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Posted 30 May 2005 - 02:00 AM

LPGsuperchargedbrumby has supercharged an ea81.

#5 LPGsuperchargedBrumby

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Posted 30 May 2005 - 04:39 AM

i did super' a ea81, then i got greedy with the wanting more boost and it grenaded shortly after.....however it was on carb pistons and im pretty sure it went lean possibly due to it outstriping the amount of fuel my lpg regulator could supply. also got told in no uncertain terms by a 'orifice' of the law that i wasn't allowed it unless it was a certified mod' , that cost $300 that i didn't have at the time.

that said,it went like a rocket untill i wanted "more" .

one thing to think about if your racing is weight, a Rootes type blower is about 3-4 times as heavy as a turbo of the same realistic capability

i had an SC12 off a 4agze......be warned if you are going to try a toyota blower that you can't run petrol through them as it toasts the seals in real short order

#6 Caboobaroo

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Posted 30 May 2005 - 09:16 AM

A dude by the name of Douglas Vincent has a supercharged Legacy Wagon in washington. I met him at the WCSS and spoke to him a little on the legacy board. he's the one who bought my AWIC and he has it in use on the supercharged EJ22.

he's done alot of fabbing and testing to get it almost right. look him up on bbs.legacycentral.org

-Brian


That's one bad @$$ Legacy!!! I talked to him about it at WCSS as well and he's running a Mercedes supercharger off of a Kompressor I believe. Here's a pic of the motor at the show http://usmb.net/gall...um274/WCSS6_049

#7 Myxalplyx

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Posted 30 May 2005 - 11:31 AM

I believe this same guy goes by 'RedDevil' at the NASIOC site. He has a few posts up about his supercharger setup. Here is one of the threads about it:
http://forums.nasioc...ht=supercharger

#8 75skunkaroo

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Posted 30 May 2005 - 05:26 PM

Posted Image

-mike

#9 Myxalplyx

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Posted 30 May 2005 - 07:03 PM

Here's his dynograph at 7psi of boost.

Posted Image

#10 Matty B

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Posted 30 May 2005 - 08:09 PM

As both of the above described engines are dead, I would look at a more reliable formula.
There is a guru in Adelaide Australia by the name of Steve, goes by Steve-rising-sun on the ausubaru board.
He had built a couple of supercharged EA motors. They are still running.
He willl have another built and running soon, MINE.
Propane (or LPG here in Oz) is the key- its all about running them on gas to prevent detonation.

When EA81's are so cheap and the blowers are around $250 on ebay, why bloody not!

#11 reddevil

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Posted 30 May 2005 - 09:15 PM

Yeah mine is dead, but you have to ask "why?"

Greedy.

It doesnt matter what you boost with if the timing isnt pulled. Run stock NA ecu and after awhile of high boost you are going to break something. Mine broke real bad but because I knew it was going to so I forced its hand and took it too the drag strip not once, but twice with bad compression, ran the crap out of it, AND THEN, ran the crap out of it at a rallycross. Near the end the boost was hitting almost 10 psi. I still drove it home, washed it off, went and picked up my kid, and drove it around the next day. And then parked it.

You need some sort of engine management no matter what you have if the car wasnt intended to have boost.

#12 Matty B

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Posted 30 May 2005 - 10:04 PM

RedDevil, well done with what you have created,

I read with interest the nasoic thread. I hope you get it running again.
The treatment you have given that motor was sure a good test - harsher than normal conditions thats for sure.

The original question here was for EA or ER engines though. LPsuperchargedbrumby has had it real close to reliable with mild boost, I beleive the turbo pistons will allow a little more boost without "grenading".
Hopefully.
The pulleys I have are geared to run 8 psi, with gas I am looking for 35% more power at least.
RELIABLY.
1/4 mile times are not critical to me, smooth delivery of power is.

Cheers
Matt

#13 WJM

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Posted 31 May 2005 - 08:25 AM

I will be going with full engine management.

Dont know what I am going to do with the bottom end...I've proven that the stock EA82T bottom end can handle 300+ ft-lbs of TQ. I am going to get some Cometic head gaskets and ARP head studs to prevent head gasket failure every 10k~20k miles.

At this point...two 'quickie' options i am thinking of...using the stock EA82T bottom end and putting 10~12 psi to it....or the stock EA82 NA bottom end and run 8~10 psi to it. I ran a stock NA one with a stock EA82 turbo setup on one for 24k miles. Rings gave up at that point.

#14 WJM

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Posted 01 June 2005 - 07:41 AM

ok, so roots style SC, and im going to hack into an intake manifold, either and spyder or normal one, and make the SC part of the intake manifold.

#15 JWX

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Posted 01 June 2005 - 10:23 AM

good call. now make it stick out the hood with a big scoop.

#16 WJM

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Posted 01 June 2005 - 10:49 AM

good call. now make it stick out the hood with a big scoop.


NO. you redneck.

#17 NorthWet

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Posted 01 June 2005 - 12:53 PM

NO. you redneck.

Naw. F'n he wuz a rednek he wood half sed 2 leev da hood off an' juz leev da hood hinges stikin in to da air!

#18 mattyg41383

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Posted 01 June 2005 - 05:35 PM

c'mon

Posted Image
thanks summitracing.com

#19 Ross

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Posted 01 June 2005 - 10:58 PM

eeewww.. I'm with WJM, keep it below the hood.

#20 LPGsuperchargedBrumby

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Posted 02 June 2005 - 12:19 AM

eeewww.. I'm with WJM, keep it below the hood.


me too...out of sight is out of the cops ticket book

#21 JWX

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Posted 02 June 2005 - 12:29 AM

just for the record I was joking :)

#22 mattyg41383

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Posted 02 June 2005 - 08:06 AM

likewise. what SC did you have in mind to use on the car?

#23 WJM

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Posted 02 June 2005 - 10:40 AM

a roots style....so my power band looks like this:

_____________________________

instead of the usual cammel hump like most turbo setups do.

#24 Frank B

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Posted 02 June 2005 - 05:37 PM

So, does anyone have a pulley size / ratio chart to figure the psi settings?

#25 Frank B

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Posted 02 June 2005 - 06:16 PM

Also, wouldn't this be easier on a turbo car? Since the fuel management and engine is built for boost?




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