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Old 04-25-2001, 08:59 AM   #1
edkwon
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Post Question about intake systems on MY99 RS (MAF system)


I know this topic has probably been beat to death ad nauseum, but i'll ask it again. Are there good aftermarket intakes for the MY98-99 RS that use the MAF and not the MAP sensor systems or will i need to get something like an APex AFC to supplement an intake for a 99 car to make the A/F balance work well?

Ed
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Old 04-25-2001, 09:05 AM   #2
bratmantlz
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Thumbs up

not that i know of since you get rid of the plumbing that keeps it from tweaking the A/F slightly... i use a jcsports intake although i have been considering a rallispec... not sure yet
Brian
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Old 04-25-2001, 09:33 AM   #3
remarcable
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I just did the snorkusectomy which is about as far as you can go without pissing off the MAF. At least I *hope* it doesn't die on me.

Very annoying little thing.

YMMV, if you can find an intake that works without costing you $400 a pop for MAF sensors then all the more power to you!
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Old 04-25-2001, 01:46 PM   #4
Eric Gagnon
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On the 99 if you replace the whole intake tract (both filter boxes) you will need a fuel controller of some sort. A Apex-i SAFC or Field SFC both will work fine.

I am running the Rallispec intake w/ Field fuel controller. If you do not use a fuel controller you will run lean at 5500rpms and up.

Intake will run you $350 and fuel controller will cost you approx: $300

Eric
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Old 04-25-2001, 01:50 PM   #5
bratmantlz
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my maf is fine i have had my intake for along time now i do have a S-AFC too
Brian
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Old 04-25-2001, 05:18 PM   #6
Revision
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The only time you need fuel adjustment is at WOT at 5500 rpm and up. At part throttle at the same rpm the MY99 will run rich.

So, if you don't want to install an AFC or FPR, install a piece of wood under the accelerator to keep from going WOT.
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Old 04-25-2001, 10:10 PM   #7
NA Impreza
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i have an air filter in my car without the bend that eliminates the second airbox but i took out the filter in the second airbox and replaced it with the air cleaner gasket (bought from ISR) this basically eliminates the 2nd airbox....so i was wondering if my car would run lean at WOT? thanks
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Old 04-26-2001, 03:48 AM   #8
Narso
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Cool

The ISR approach seems to be the best compromise. Replace the first air box with a cone filter (Kartboy makes a nice adapter) and keep the second air box intact (replacing the second filter with a gasket). I cobbled together an intake from Pipercross (filter) Kartboy (adapter) and ISR (pipes and MAF brace) about 7,000 miles ago. Nice improvement in power, no need for the AFC and retains the second air box to preserve low end torque. ISR has sold many my99 intakes and has not had a single MAF failure. Keep in mind that this is a compromise. If you want all-out power and have a good chunk of change to spend, then go with Rallispec and an AFC system. That, along with all wheel drive dyno tuning will cost you over, say, $750.
YMMV
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Old 04-26-2001, 05:17 AM   #9
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NA Impreza, unless you get something with higher flow (ie get rid of the 2nd air box,forced induction) don't worry.
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Old 04-26-2001, 07:15 AM   #10
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I have an ISR set up on mine...no problems so far, but I do carry a spare MAF in the trunk just in case...
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Old 04-27-2001, 12:37 AM   #11
edkwon
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Ok, thanks for the suggestions guys.

Ed
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