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Old 07-08-2003, 06:50 PM   #1
Compressed
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Default 98 RS intake issues

first some history.
I bought my car with a JC sports short ram. I've made a cold air box for it, that has helped but I know I'm missing some serious low end power. Mid range is great but Up top I think I am experiencing the dreaded lean run condition that Sport Compact Car found in their 99. I assume '98's are equally vulnerable to this right?

First off since the 98 is maf based, I assume it is just as susectible to lean run condition with intakes as the 99 is, correct? If so, it seems the only way to avoid this would be to modify a cobb intake to be used with a maf. I'm assuming you get a maf adapter and then hack the cobb intake accordingly to fit the maf and adapter into the intake. I know some people have done this, have you had good long term success? Have you verified that this setup avoids the lean run condition at high rpm?

Any input is appreciated!
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Old 07-08-2003, 07:09 PM   #2
Albert
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I believe the 98's are the opposite and run rich up top.
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Old 07-09-2003, 08:24 AM   #3
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When we plumbed our intake to the vent cover in the bumper (where the foglight would otherwise be), we got a CEL after some milage was put onto the new setup (after ECU reset).

We then used our SAFC to enrich things as RPM rose. Not only did the CEL stop showing up, but we started making MUCH more power.

I guess this tells me that we were running lean as a result of our freeflowing CAI on our 98RS. Check our site for pics of the setup, but excuse the marketing direction of the site.....

Jay Storm
www.sourcemotorsports.com
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Old 07-09-2003, 10:09 AM   #4
rhdude
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get a S-AFC and all your problems will go away... I had the same problem until I got mine...
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Old 07-09-2003, 11:04 AM   #5
Compressed
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Good to hear that a SAFC has helped many of you. I'm ready to get one and start making some settings, I think I could use one soon anyway as I will be adding headers, this will complete a full exhaust for me. I also have a exedy flywheel and a LW crank pulley.

I have heard that the RS ecu learns over the safc settings and ultimately proves to be useless, as the ecu makes changes to counteract the safc changes. Any truth to this, or this just more internet noise?
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Old 07-09-2003, 11:06 AM   #6
DanzBorin
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Quote:
Originally posted by Compressed
I have heard that the RS ecu learns over the safc settings and ultimately proves to be useless, as the ecu makes changes to counteract the safc changes. Any truth to this, or this just more internet noise?
on the 00-01 MAP based impreza this is true... not for the 98-99 models though...
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Old 07-09-2003, 11:22 AM   #7
Compressed
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Quote:
Originally posted by DanzBorin

on the 00-01 MAP based impreza this is true... not for the 98-99 models though...
I knew I had heard that somewhere. Thanks for the clarification!

I'm thinking about getting the Cobb still, it would be nice to have more low end grunt, and to not have any more bogging from a start. A couple times now, the car has bogged badly, like completely falling on its face when starting from a stop and flooring it too soon, it sucks and is actually very unsafe. I dont want to think about it happening when I need to merge or make a quick turn. For now I'm just careful about feeding the gas in slowly until a little later in the rpm band.
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Old 07-09-2003, 02:24 PM   #8
Albert
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I apologize, seems I misunderstood or have been misinformed by statements from a few notable tuner out west.

Pls clarify for me; in stock form (no mods) the '98 has been confirmed (dyno'ed) to runs lean up top?
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