fuel rail how much does it help #3 cylinder - Subaru WRX Forum
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post #1 of 16 Old 04-14-2007, 03:58 PM Thread Starter
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fuel rail how much does it help #3 cylinder

I have been looking and doing alot of reading on this. they say the # 3 cylinder does not run as good as 1 and 2 and a fuel rail will help fix that. would it be wise to get one with only a uppipe and a airtake done on my car. or is there something out there beside the rail to help fix that.
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post #2 of 16 Old 04-14-2007, 04:27 PM
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what kind of intake do you have?
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post #3 of 16 Old 04-14-2007, 05:23 PM
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Fuel Rails will help out the lean conditions on #3 but you will need a tune right after putting them on....there really isn't a need for 'supporting' mods to upgrade your fuel rails

"Life's a bowl of punch so go ahead and Spike it!" -311
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post #4 of 16 Old 04-14-2007, 09:52 PM Thread Starter
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cobb intake and perrin uppipe
so how bad does this screw up your engine and how much power do you lose becouse of this
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post #5 of 16 Old 04-15-2007, 03:29 AM
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you don't lose any power at all with those mods....but without a tune it is bad for your motor

"Life's a bowl of punch so go ahead and Spike it!" -311
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post #6 of 16 Old 04-15-2007, 02:15 PM Thread Starter
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i'm talking about the rail
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post #7 of 16 Old 04-15-2007, 02:22 PM
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You wouldn't lose any power from fuel rails either....you could even gain...the main reason for fuel rails is to give a more even flow...but as with any mod you should get tuned ASAP

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post #8 of 16 Old 04-15-2007, 05:27 PM Thread Starter
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i know about tuning that is down i was just trying to find out if you were loseing any power with the # 3 how it is
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post #9 of 16 Old 04-16-2007, 02:42 PM
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the only thing I could think of is that #3 being lean your not getting a good combustion in the chamber and it would also not be cooling as fast cause you wouldnt have enough fuel to cool down the cylinder and piston. Worse case scenario is that it would just finally get bad you would have to fix it, but that would be pretty extreme.
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post #10 of 16 Old 04-17-2007, 06:35 PM
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Actually the series fed fuel rails are part of the problem.The other part is the stock exhaust manifold design.The #3 and #4 primaries have very shrp bends coming off the heads and do cause a restriction in flow which = higher EGT's in those cylinders.Headers and ported/polished stock headers will help more than fuel rails.The fuel rails don't become a problem untill higher HP #'s.Also getting your injectors cleaned and flow balanced is a good idea. Witch Hunter Performance does it for $15 an injector including new o-rings and injector filter baskets.

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post #11 of 16 Old 04-17-2007, 11:50 PM
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The exhaust manifold is the problem? What about the intake side of it?
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post #12 of 16 Old 04-18-2007, 08:32 AM
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Don't think the intake is really a problem.The runners for the WRX are pretty well matched and equal.The reason i know about the exhaust is because a guy on NASIOC tested this theory with a 4 channel EGT gauge.http://forums.nasioc.com/forums/showthread.php?t=529496

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post #13 of 16 Old 04-18-2007, 12:52 PM
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Wow thats a pretty interesting read, I would almost port and polish the exhaust manifold just to lower the EGT's, mine runs about 1600 already which is kinda high, I dont understand why its doing that either.
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post #14 of 16 Old 04-19-2007, 10:30 PM Thread Starter
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if you port and polish the exhaust manifold how much do you think that is going to help
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post #15 of 16 Old 04-20-2007, 12:44 AM
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a significant amount. cost some big bucks though.
Black05- sounds like your running pretty lean to be up that high.

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02 rex is gone.
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