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Old 10-28-2002, 12:31 PM   #1
Scooby Specialist
Member#: 13726
Join Date: Dec 2001
Location: Maryland
2002 WRX - 264 AWHP
ION-Turbo&LINK [email protected]

Default Help solving a Link problem

I saw this posted in the FFI forum under the Link/Walbro pump sticky thread:

Originally posted by davidm_sh
...like vacuum overrun not kicking in UNTIL 2500rpm or greater = running VERY rich between 2000-2500rpm (which is where I do most of my city cruising = cause O2 sensors to die prematurely from reading O2 values of 11-12:1 most of the time)...
Now last night I got my DIY prebuilt wideband 02 working (and working well I might add.) I also noticed that I would go extreemly rich (lower than 10:1) before dropping into vacuum overrun which puts me at greater than 25:1.)

Anyway is this a know problem and can I fix it by playing with the vacuum overrun possibly raising the value?

The way you are supposed to set the vacuum overrun is by driving the car above 4000 rpm and letting your foot totally off the gas and measuring your map reading. Mine is at 17 so I set my vacuum overrun at 15 as stated in the manual. I notice most maps I get from other people are set at around 25 so I was wondering if this may be a better setting.

I'll play with it and let you know my results but if you guys have any info in the meantime let me know.


P.S. Since getting my injectors and fuel pump in combination with the Link my gas mileage is terrible. This is actually the main reason for me buying the wideband02 not just for performance. Just curious how many miles others are getting on a tank of fuel with the Link, injectors and fuel pump.
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Last edited by mynew02; 10-28-2002 at 12:37 PM.
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Old 10-28-2002, 12:46 PM   #2
Scooby Specialist
Member#: 1997
Join Date: Jul 2000
Chapter/Region: MWSOC
Location: Des Plaines, IL
2006 Acura TL 6spd
STMGM6 alumni


I think setting the overrun higher will solve going breifly richer. However if it just a momentary thing, I dont think Id worry about it. (if its set too high, you might hit it at cruise and idle) I idle at about 22kpa. I think my overrun is set to about 18. Not strictly what the manual said, but lower and it would tend to die when I let off the clutch going upto a stop.

as far as MPG, you're looking a cruise tuning most likely. You can run pretty lean when you know you're not putting load on the engine.
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