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Old 09-18-2005, 03:50 AM   #1
Scooby Newbie
Member#: 74461
Join Date: Nov 2004
Location: Mobile, AL
1998 Impreza 2.5 RS
WRC Blue

Default 98 DOHC impreza

DOHC impreza, supercharged (8 psi), intake/exhaust, A/T , and live in a very warm and humid city. The previous owner pieced together the s/c kit, but it doesn't appear to have any fuel management done. I'd like it to perform as well if not better than a newer WRX, but no crazy numbers or anything. What upgrades would I need for this thing to make some power and not eat itself.

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Old 09-18-2005, 04:58 PM   #2
RIP 10/12/83 to 02/10/08
Scooby Specialist
Member#: 83254
Join Date: Mar 2005
Chapter/Region: NWIC
Location: Roy, Washington
98 2.5 RS
04 WRX


Well, since its doing 8 PSI i'm going to assume its got an Intercooler. I would hope that they atleast used a RRFPR and something to control timing. the DOHC has some small injectors, the 99 SOHC has bigger ones. If you want more power, your going to need a Fuel pump if it already doesn't have an upgraded one, bigger injectors. and something to control them. A piggy back like the Perfect Power or the E-manage will work. You can get the Perfect power at http://www.rallitek.com Then you'll need to tune it and get a smaller pulley for your supercharger. I would think at 8 PSI you should have enough power to beat a WRX..
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Old 09-18-2005, 06:24 PM   #3
Scooby Newbie
Member#: 43114
Join Date: Sep 2003
Location: Pownal, VT
1998 Legacy GT Turbo


Agreed. Get something to tune the fuel and timing with and you'll
notice enormous gains with the same level of boost. It will
also burn cleaner and get better gas mileage.

With a tune, I imagine you could beat a WRX without much
problem. I run a turbo system at 8-9 psi (depending on the seasons),
with lower compression pistons, and I can easily destroy a WRX.
Judging from the other subarus i've driven I'd say I'm around 280 lbs/ft
of torque.

I would say also, that you shouldn't get an RRFPR with 8 psi, unless you
have SOMETHING that'll let you cut back fuel at higher RPMS (>4000).
With an SAFC II I was able to lean out the top end and make some real
power back (RRFPR was drowning it in fuel.)
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Old 09-19-2005, 01:22 PM   #4
Matt Monson
Scooby Guru
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
99 2.5RS, '85 911
'73 914 and 2012 BRZ


What supercharger is it? Who did the kit? Has one of the few running Rimmer's actually surfaced???
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