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Old 11-12-2001, 01:46 PM   #1
EneMy X
Scooby Newbie
 
Member#: 12222
Join Date: Nov 2001
Location: Bay area CA
Vehicle:
1991 Toyota Mr2
Red

Default New to the scoobys, can someone answer some simple Q's for me?

Hello AWD guys...

I own a Very fast mr2, I am planning on getting a second car, Im thinking about picking up a 1998 2.5 RS...

I have no intention on keeping it stock. I have searched the net and the threads and havnt been able to get much info on engine swapping and turboing the RS....

so Im wondering if anyone has any info or websites where I can read up on the 22b swap or any other swaps for the Impreza.


I chose the RS over the DSM and other RWD/AWD cars becuase they are the lightest of the AWD cars out there (as far as I can see) My goals would essentially be a low 12 or high 11 second pass time. I could of course just build the 2.5 liter motor and turbo that but Im not sure what the best option is...

Are the Scoobys powerd by a map sensor or a Mass air flow type of sensor?

Thanx for any help guys.
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Old 11-12-2001, 02:33 PM   #2
jeffg
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Member#: 2958
Join Date: Nov 2000
Chapter/Region: NWIC
Vehicle:
2001 WRX (GC8)

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The 1998 RS you are looking at has a MAF based fuel system. It also has 9.8:1 compression. The compression makes it hard to run very high boost. I have seen a couple of people running ~10psi on stock internals, but not much more than that. If you want a high boost car to use at the strip, do not buy an RS. Buy a cheaper L series Impreza that is AWD. You can then turbo the 2.2L engine or swap it out for a 2.0L WRX motor. This will save you a lot of money and you will end up with basically the same car.

Just my opinion.

Jeff
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Old 11-12-2001, 02:35 PM   #3
DanzBorin
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Chapter/Region: TXIC
Location: Houston - Downtown Julie Brown
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2015 Outback - Croc
Dundee Edition Ice Silver

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Most of your answers will be in the non-factory forced induction forum.

As far as airflow, my98 and my99 2.5s have MAFs, and my00-01 have MAPs. my98 is DOHC, and my99-01 are SOHC. They found the SOHC to produce more torque.

Hope this helps

Rob
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Old 11-12-2001, 02:57 PM   #4
sstyle
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Location: Portland, OR
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98' RS
Pearl Black

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Keep in mind that turbo or engine swap = new tranny and clutch. Also the MY98s have the older style front bumper and not as many options as the MY99+ because of the MAF. This car is not a drag car, it is a lot more. Just ask any of the rally or autocross guys. I would slap on a turbo but also work up the suspension.
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Old 11-12-2001, 02:59 PM   #5
IggDawg
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Mostly kind of white

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Yeah... you really want an engine with a MAP. All I hear are people complaining about their blown MAFs.

-IggDawg
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Old 11-12-2001, 03:05 PM   #6
EneMy X
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Join Date: Nov 2001
Location: Bay area CA
Vehicle:
1991 Toyota Mr2
Red

Default Hi

thanx for the info guys


Keep in mind that turbo or engine swap = new tranny and clutch


Of course that is always in my mind. Especially with the AWD, I have built 4 cars, all turbo, civic, DSM, Mr2 and a golf...have been working on cars for about 8 years, So I know how the lines go, I just really love the 2.5 Im maybe thinking about getting a WRX clip or somthing...but it looks like will cost a pretty penny
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Old 11-12-2001, 03:07 PM   #7
HndaTch627
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Location: Carol Stream, IL
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'01 GC8 Dinged STM
'09 Concours 14 ABS Black

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MAF's are terrible when desinged and anchored right. But i don't understand the impreza drag racing scene...these car well not designed for straight line acceleration. I also seocnd the buying an 94-95 L Model...you'll save yourself a TON of money. can sawp all the RS looking parts onto it w/ a EJ22T or EJ20T for QUITE a bit less then the price of the RS alone. Oh and yes to run low 12's and ll's you had better bring your wallet.

Jeremy
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Old 11-12-2001, 03:42 PM   #8
DanzBorin
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I believe MAFs are better for Turboing. Yes, they are fragile, and a pain in the a$$, but they measure airflow more accurately than the MAPs. I think my99 would be the best for a 2.5, but you will have to rebuild the engine to lower the compression ratio. If you can find a nice condition 2.2l Impreza, go with that. Looks can be added fairly easily and you will have an engine better suited for boost.
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Old 11-12-2001, 03:44 PM   #9
mrbell
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Member#: 1871
Join Date: Jul 2000
Location: Salt Lake City, UT
Vehicle:
2000 Impreza 2.5RS
Blue Ridge Pearl

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as the old saying goes, there's no replacement for displacement... so, for an all out monster where money is no object, the EJ25 would be your best bet... it's gonna cost you tho to build it up. the 98 motors work fairly well for turbos because of their "low" compression... unfortunately the block itself hasn't proved to be as durable as the 2000's and 2001's... the problem w/ the 2000's and 2001's seems to lie the the compression of 10:1 and perhaps weaker pistons(probably related)... what else... there have been a couple people who swapped in EJ22 blocks from the early 90's turbo legacies... those will need some work too, to breath better, and still have a fairly high compression of 9:1, ithink, so you might want new pistons... I think alot of people have had problems w/ thier pistons dying in those... Trey Cobb seems to have the best parts, service, info about building the EJ25 up... www.cobbtuning.com good luck...
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