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Old 08-27-2012, 06:07 PM   #1
chappell943
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Default Why am I running so rich with stock injectors?

Hi, just looking for a bit of insight as to why I am running so rich upon spool up (3k-3.5k) Im running into the 9's when my open loop fuel map calls for 11.27, I am running stock injectors and stock intake with the intake silencer removed and a K&N panel filter.

Car is V7 STI with
3" TBE to Genome muffler
GFB deceptor pro bov set to full recirculate
K&N panel filter.

I have so far cleaned the maf, in closed loop on cruise I run a steady 14.7 so I don't think it is the maf sensor causing the issue, my 0 -5.60 fuel trims are a bit high at -8.5 but all the rest are between 0 and -3. What would cause just the A trim to be high. (Take note all fuel trims are in the negative, BCD are upto -4, Im guessing this may contribute to this.)

Please find 4th gear log, any other comments about the log are appreciated. Thanks

https://docs.google.com/spreadsheet/...TB6T1RZdi1FX2c
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Old 08-27-2012, 11:40 PM   #2
lukeskywrx
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What MAF? -Speed Density!

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Looks very much like a boost leak that is really only affecting you at peak boost
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Old 08-28-2012, 12:47 AM   #3
chappell943
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Thanks, From other reasearch I suspected this was the case.

What are common places for a boost leak as I took off my top mount a few hours ago before reading this and checked all clamps under the top mount, the clamps from turbo to Y pipe and from throttle body to IC, I also checked my bov which is a GFB deceptor pro which does not need the factory gasket as the bov has its own o-ring. (is set to full recirculate), this issue was also present with stock bov.

I also checked all boost lines between turbo/wastegate and solenoid for cracks or splits and found none.


All connections appeared tight and could not find any rips.
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Old 08-28-2012, 03:14 AM   #4
alexmartynyuk
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are you using factory plastic y pipe(i assume thats what material is used but only because mine was plastic but mine is a usdm bugeye)?
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Old 08-28-2012, 03:26 AM   #5
chappell943
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My bugeye is STI and the y pipe looks like this.

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Old 08-28-2012, 04:02 AM   #6
JMSok8
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To the looks of it, your red IC to Turbo hose looks pretty chewed up man, i would suggest changing that ASAP.
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Old 08-28-2012, 04:12 AM   #7
chappell943
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Sorry forgot to say I got that image off google for reference, both of those hoses are probably due for replacing on mine tbh, any idea where I would find some and do you think that would be the cause taking into account I still hit target boost and only run really rich from 3-3.5k rpm
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Old 08-28-2012, 11:52 AM   #8
lukeskywrx
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Quote:
Originally Posted by chappell943 View Post
Sorry forgot to say I got that image off google for reference, both of those hoses are probably due for replacing on mine tbh, any idea where I would find some and do you think that would be the cause taking into account I still hit target boost and only run really rich from 3-3.5k rpm
It is likely a small leak that is only opening up at high pressure and not really affecting you as boost levels drop from peak. Might be a manifold leak or a cracked hose as they are very common and usually pretty small.
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Old 08-28-2012, 09:27 PM   #9
quazimoto
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Search "boost leak test"..........
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Old 08-28-2012, 09:50 PM   #10
chappell943
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Was planning to build one this afternoon or it least start, was just tring to gauge if there were any places which are more common to others to leak considering I am making target boost and still run perfect vaccum levels.
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Old 08-29-2012, 03:17 PM   #11
alexmartynyuk
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Quote:
Originally Posted by chappell943 View Post
Was planning to build one this afternoon or it least start, was just tring to gauge if there were any places which are more common to others to leak considering I am making target boost and still run perfect vaccum levels.
Maybe under vacuum the leak collapses on itself and seals up so you still have good vacuum?
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Old 08-29-2012, 07:07 PM   #12
chappell943
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That actually makes a lot of sense, should be boost testing in the next day or so, will post results when I know.
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Old 09-13-2012, 06:26 PM   #13
chappell943
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Update: Did a boost leak test and found no leaks, checked and changed spark plugs, Old plugs were all the same colour.

A trim is -8, B trim is -1 C trim is 0.5 D trim is 0.

Would it be wise to do some OL maf scaling using the guide here or is there something im missing?
http://www.romraider.com/forum/viewt...hp?f=33&t=5321

note intake is stock with K&N panel filter and intake silencer removed but keeping the cut elbow in place.
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