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Old 06-22-2008, 02:50 PM   #1
awd-box-turbo
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Exclamation Anyone hitting LEAN Spikes with TurboXS Stage 4 map

so i recently upgraded to a VF34 set up and have the TurboXS factory stage 4 map loaded... and i know they're maps are suppose to be on the rich side for liability reasons... but for some reason when my rear sits at idle my AEM Wideband is reading 15.4-15.7... and when i let of on the gas it hits beyond 17:1 AFR... i really cant figure out why it hits these lean spikes... i know i gotta get it tuned but with summer school and work i really dont have any time right now... heres a list of my mods...

*LIST OF MODS*

-TurboXS Stage 4 map
*UTEC Delta
*VF34
*565CC STi Pinks
*Walbro 255lp fuel pump
*One-Step Colder Spark Plugs
*Cobb Crank Pulley
*APS Turbo Inlet hose
*APS Pod "shorty" Intake
*TurboXS FMIC
*GFB 100% atmospheric BOV
*TurboXS Catless Uppipe
*Titek Catless Downpipe
*HKS Carbon Ti Exhaust
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Old 06-22-2008, 03:44 PM   #2
jaxscuby
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the aps shorty might have something to do with
idle @ 15.4~15.7.

but did you calibrate aem wideband?
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Old 06-22-2008, 10:22 PM   #3
awd-box-turbo
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how do you calibrate the AEM wideband?
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Old 06-22-2008, 10:29 PM   #4
awd-box-turbo
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even if the wideband isnt calibrated, my factory AFR on my dashboard reads fairly similar to my wideband... still hits lean...
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Old 06-23-2008, 02:16 PM   #5
jaxscuby
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i'd say you have a vacuum leak somewhere.
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Old 06-23-2008, 10:47 PM   #6
awd-box-turbo
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could a vacuum leak cause a car to run lean? wouldnt that make it run rich?
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Old 06-23-2008, 11:04 PM   #7
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So you are only getting into these lean conditions at idle, and when you let off the gas? As long as the the car is not running lean under boost then the tune is fine. The car is not supposed to be rich during idle or cruise conditions...otherwise you would get 3mpg
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Old 06-23-2008, 11:29 PM   #8
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Quote:
Originally Posted by awd-box-turbo View Post
could a vacuum leak cause a car to run lean? wouldnt that make it run rich?
Yeah a vacuum leak would cause it to run rich if anything. What are your AFR's in boost? Are the injectors newly installed or do you smell fuel anywhere in the engine bay?
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Old 06-24-2008, 09:38 AM   #9
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Quote:
Originally Posted by 94'325is View Post
Yeah a vacuum leak would cause it to run rich if anything. What are your AFR's in boost? Are the injectors newly installed or do you smell fuel anywhere in the engine bay?
Vacuum leaks will make the car run lean. Any air that is not going through the MAF that is introduced into the combustion chambers is unmetered air. The proper amount of fuel will not be delivered due to this misreading.
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Old 06-23-2008, 11:05 PM   #10
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i was going over the AEM UEGO manual and it comes factory calibrated and the settings are correct when i pulled it out... im idling at 14.7:1 - 15.3:1? could it be because i have a FMIC and a short ram? or could it be i have a leak at one of my injectors? from what i understand im either having too much are in, OR im not getting enough fuel in?
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Old 06-24-2008, 09:42 AM   #11
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Quote:
Originally Posted by awd-box-turbo View Post
i was going over the AEM UEGO manual and it comes factory calibrated and the settings are correct when i pulled it out... im idling at 14.7:1 - 15.3:1? could it be because i have a FMIC and a short ram? or could it be i have a leak at one of my injectors? from what i understand im either having too much are in, OR im not getting enough fuel in?
How is idling at 14.7:1 lean?

When you are off throttle coasting in gear (engine braking) you shouldn't even have a readable AF ratio. Sounds to me like you're fine, as long as AFR under boost conditions are acceptible.
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Old 06-23-2008, 11:10 PM   #12
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well even if im coasting it runs beyond my wideband's range... it just blank out... also when im braking in gear, it will blank out till me rpm's drop to 1000...
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Old 06-23-2008, 11:33 PM   #13
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You are right; the A/F is extreamly high under coast and downshifting(which is why your gauge blanks out), but that is how its supposed to be. Your car should not be giving the engine much fuel when you are not giving throttle input and the engine is already spinning faster than idle; example- rolling downhill in gear. Fuel is used to speed the engine up, not down. What is the air fuel ratio under boost? If it is safe than the tune is just fine.
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Old 06-24-2008, 12:21 AM   #14
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when in boost its about 12.8-14.9 when im boosting... it tends to jump around those general numbers...
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Old 06-24-2008, 11:10 AM   #15
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Quote:
Originally Posted by awd-box-turbo View Post
when in boost its about 12.8-14.9 when im boosting... it tends to jump around those general numbers...
Ok thats pushing it on the lean side on an off the shelf map. Get yourself tuned.

14.7 at idle is exactly where it's supposed to be.

Running lean/unreadable AFR's when you're coasting/letting off the gas is COMPLETELY 100% NORMAL, don't worry.

But ya, you're running a bit too lean to be in the comfort zone when at WOT.
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Old 06-24-2008, 11:23 AM   #16
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The intake vacuum should be checked for leaks before you get a tune. You do not want to use the tune as a band-aid to address the problem if it exists. Your car will not see it's full potential.
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Old 06-25-2008, 02:24 PM   #17
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thanks for all the help guys... im gonna do a leak down test just to be sure...
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