2.2L L61 Performance Tech 16 valve 145 hp EcoTec with 155 lb-ft of torque

big afr change?

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Old 11-26-2010, 07:49 PM
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big afr change?

how big of a difference in AFR's would decatting a downpipe and changing the length of the chargepiping cause? my AFR's were right before i did that and when i changed everythin the AFR's shot thru the roof and i just changed my fuel pump to a walbro and now my AFR's are like 1 point lower. is it still a fueling issue or did i manage to find more air?
Old 11-26-2010, 10:11 PM
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those mods wil change things marginally, and yes you found more air by removing the cat.
Old 11-26-2010, 10:18 PM
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alright, cause my **** leaned and i was like wtf is goin on?!
Old 11-29-2010, 10:31 PM
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would the volume of air be changed enough to make me go from 11.7 too somewhere in the 14s at the same psi? i been talking to vince and he thinks something is clogging the fuel system but i just changed the fuel pump and it didnt help and i dont got a long ass gauge that can reach in my car

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Old 11-30-2010, 12:51 PM
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anyone?
Old 11-30-2010, 01:02 PM
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If ur afrs were fine before u messed with it then u either. Need retuned which is obvious, fuel injection has a issue, or u have somthing loose. Data log it.
Old 11-30-2010, 01:04 PM
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Originally Posted by Chevycobaltss3
If ur afrs were fine before u messed with it then u either. Need retuned which is obvious, fuel injection has a issue, or u have somthing loose. Data log it.
a retune is wat i was thinking, and i did datalog it
Old 11-30-2010, 05:50 PM
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If u data log it, fuel trims are correct, no kr, injector duty cyce is within its bounders then al is good. But u need to check fuel pressure.
Old 11-30-2010, 05:54 PM
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I didn't realize you changed the CP when we were talking, I thought you just said you de-catted. That will def need some readjustment and explains why it goes lean and still pulls hard. Like I just sent: Any car Ive had a weak pump in would drive normal, go lean and the power would flatten out when it did. Plus you can see the IDC% sky rocket when that happens and the car never goes richer.
Old 11-30-2010, 05:58 PM
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Originally Posted by Chevycobaltss3
If u data log it, fuel trims are correct, no kr, injector duty cyce is within its bounders then al is good. But u need to check fuel pressure.
thats wat im waitin to hear about

Originally Posted by BYT*SS*TURBO
I didn't realize you changed the CP when we were talking, I thought you just said you de-catted. That will def need some readjustment and explains why it goes lean and still pulls hard. Like I just sent: Any car Ive had a weak pump in would drive normal, go lean and the power would flatten out when it did. Plus you can see the IDC% sky rocket when that happens and the car never goes richer.
i coulda sworn i said somethin lol. but yea, i bought usmcfieldmp old c/p cause it was cleaner then mine and it looks great. i just got issues. the car pulls hard as **** and will def turn heads, i just dont want it to turn my wallet upside down if it blows lol
Old 11-30-2010, 06:04 PM
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Yea, 14:1 is a bad time for a turbo car LOL. I would take it easy for right now!!
Old 11-30-2010, 06:08 PM
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iam lol. i dont got money or time to fix the engine. half throttle is still pretty sick tho
Old 12-01-2010, 09:45 PM
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facepalm myself

well i got her fixed....turned out i was uploading the wrong tunes vince was sending me lol. when i would download his tunes it would go from old to new but for some reason the new ones had been going to the top of the download list. shes all better now just need to do a couple more logs to get the AFRs back right and she will be ok. still pulls like a bitch tho lol
Old 12-02-2010, 08:22 AM
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Yea, that's a fail LOL
Old 12-02-2010, 09:03 AM
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hell yea man. i think this may be in the top 5 biggest fails of my life lol. i felt like a straight idiot lol. i knew somethin was wierd....i went back to the email, brought up the menu that said "show in folder", expanded the tab so i can see the full name and i was like "daaaaaaaaamn, i been uploadin the wrong ****!". lol
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