MY 1999 Impreza RS, Does it have more potential for FI then other model years?

mattyquinn22 · 12-11-2003, 08:55 PM

Hello this is my first post on the board but I have been poking around on it for quite some time. I still have yet to find what the upsides of owning a 99 2.5rs are. I have heard that they have beefier con rods then others years and that the MAF will be more happy to take aftermarket boost then a MAP car, but anything anyone has to say of why my car is differnt from the following years would be greatly appreciated
My car is at 48k miles and has no signs of wear on any of the driveline and is complelty bone stock but I soon want it to keep up with a usdm rex or at least off the line to 40 mph with bigger displacement just not huffing as much o2 so that high compression displacement doesnt find its way into the form of sharpnel in my bottom end, I realy want a reliable way to add FI with about 6 psi and having a stock bottom end and knowledge about clutch and tranny troubles at this power level would be apreciated as well!!! And with cold weather would piggyback engine management be a terrible idea not sure on how it would do with the molecules outside not moving so fast, then having warm weather in the summer? also heard about cobb making the access ecu for the 2.5 and not sure if that would be worth the wait for complete engine mgnt. to help reduce too many black boxs under the hood working with miracles
LOVIN the subi in New England!!! nothing beats an AWD drift in the parking lot of a Ski Mountain after a day of riding, and maybe some So co

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joubtt · 12-11-2003, 09:07 PM

http://forums.nasioc.com/forums/show...hreadid=185230

www.i-speedusa.com

OKRS25 · 12-11-2003, 10:42 PM

Love my 99 RS-T, easy turbo job. Lack of rear LSD sucks though...

Portly · 12-11-2003, 11:10 PM

I believe the '99 was the first year with the (generally preferred) SOHC heads, while still retaining the lower 9.7:1 compression ratio of the earlier years. In addition, I think '99 was the first year to see the phase 2 blocks (in some of the engines), which I believe are somewhat beefier/quieter. Plus, the intake manifold is supposed to be the only one that WRX injectors will fit directly into. From this, I always understood that the '99 was the "best" of the 2.5RS's to turbocharge, assuming you could find a way around the fragile MAF (like converting to a stand-alone engine management setup.)

If I'm wrong on this, please speak up folks.

_Jeff

HndaTch627 · 12-12-2003, 04:23 AM

a 99 RS would be the smart choice of the 99-02's except you lose the rear LSD.

Thing is you can turbo a 99 w/ a S-AFC and whatever size injectors you'd like.

PunKidd · 12-12-2003, 08:28 AM

Yep,
The MAF does not require a clamp like the MAP if you run your stock ECU. WRX or STi injectors fit the manifold perfictly. 9.7:1 CR. All these give the 99 RS an advantage over the later years.

HndaTch627 · 12-12-2003, 12:52 PM

and the fact that 99 runs more reserved timing on lower compression then the 00-02 is a big plus

greenemac2003 · 12-12-2003, 10:27 PM

1999 2.5rs would be the better choice to turbo. Go to this site and read page 8 of 10. http://www.toad.net/~rrubel/turbo.html

gm

FJP · 12-13-2003, 04:32 AM

of course, that article is almost 5 years old

greenemac2003 · 12-13-2003, 08:37 AM

Still good info from a reliable source.

gm

wac · 12-13-2003, 04:51 PM

Don't forget, the MY99 2.5RS has a rich history of blown MAFs with aftermarket turbo kits that retain the MAF (e.g. S-AFC setups). The MY99 2.5L SOHC MAF is not plug-compatible with the MY98 2.5L DOHC MAF.

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12-11-2003, 09:07 PM	#2
joubtt Scooby Specialist Member#: 33901 Join Date: Mar 2003 Location: San Diego Vehicle: 04 04 STI No AWD, Not interested	http://forums.nasioc.com/forums/show...hreadid=185230 www.i-speedusa.com

12-11-2003, 10:42 PM	#3
OKRS25 Scooby Specialist Member#: 36533 Join Date: May 2003 Chapter/Region: AKIC Location: Oklahoma, Ex Alaskan RS-T'er Vehicle: 2005 STi WRB	Love my 99 RS-T, easy turbo job. Lack of rear LSD sucks though...

12-11-2003, 11:10 PM	#4
Portly Scooby Specialist Member#: 1197 Join Date: Apr 2000 Chapter/Region: MWSOC Location: Cedar Rapids, Iowa Vehicle: 2013 BMW X1 Pearl White	I believe the '99 was the first year with the (generally preferred) SOHC heads, while still retaining the lower 9.7:1 compression ratio of the earlier years. In addition, I think '99 was the first year to see the phase 2 blocks (in some of the engines), which I believe are somewhat beefier/quieter. Plus, the intake manifold is supposed to be the only one that WRX injectors will fit directly into. From this, I always understood that the '99 was the "best" of the 2.5RS's to turbocharge, assuming you could find a way around the fragile MAF (like converting to a stand-alone engine management setup.) If I'm wrong on this, please speak up folks. _Jeff

12-12-2003, 04:23 AM	#5
HndaTch627 Scooby Guru Member#: 6551 Join Date: May 2001 Chapter/Region: MWSOC Location: Carol Stream, IL Vehicle: '01 GC8 Dinged STM '09 Concours 14 ABS Black	a 99 RS would be the smart choice of the 99-02's except you lose the rear LSD. Thing is you can turbo a 99 w/ a S-AFC and whatever size injectors you'd like.

12-12-2003, 08:28 AM	#6
PunKidd Scooby Specialist Member#: 8533 Join Date: Jul 2001 Location: Austin TX Vehicle: 2002 2.5 RS-T LudeSpeed S. III W/ FMIC	Yep, The MAF does not require a clamp like the MAP if you run your stock ECU. WRX or STi injectors fit the manifold perfictly. 9.7:1 CR. All these give the 99 RS an advantage over the later years.

12-12-2003, 12:52 PM	#7
HndaTch627 Scooby Guru Member#: 6551 Join Date: May 2001 Chapter/Region: MWSOC Location: Carol Stream, IL Vehicle: '01 GC8 Dinged STM '09 Concours 14 ABS Black	and the fact that 99 runs more reserved timing on lower compression then the 00-02 is a big plus

12-12-2003, 10:27 PM	#8
greenemac2003 Scooby Newbie Member#: 38813 Join Date: Jun 2003 Location: Raleigh, NC Vehicle: 1999 RS ej20/stg2 AP silverthorn	1999 2.5rs would be the better choice to turbo. Go to this site and read page 8 of 10. http://www.toad.net/~rrubel/turbo.html gm

12-13-2003, 04:32 AM	#9
FJP Scooby Newbie Member#: 43852 Join Date: Sep 2003 Location: aka SubaFastR Vehicle: GC8 2.5RST Black	of course, that article is almost 5 years old

12-13-2003, 08:37 AM	#10
greenemac2003 Scooby Newbie Member#: 38813 Join Date: Jun 2003 Location: Raleigh, NC Vehicle: 1999 RS ej20/stg2 AP silverthorn	Still good info from a reliable source. gm

12-13-2003, 04:51 PM	#11
wac Scooby Specialist Member#: 689 Join Date: Dec 1999 Chapter/Region: NESIC Location: Lebanon, NH, USA Vehicle: 2005 Outback 2.5 XT Champagne Gold Opal	Don't forget, the MY99 2.5RS has a rich history of blown MAFs with aftermarket turbo kits that retain the MAF (e.g. S-AFC setups). The MY99 2.5L SOHC MAF is not plug-compatible with the MY98 2.5L DOHC MAF.