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#1 |
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Newbie
Join Date: May 2008
Posts: 8
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craping out!!
i have a all stock block heads intake 5.0 with vortech s trim 75mm meter and 24lb injectors the car ran great until i upped the boost to 13-14lbs then it started blowing out spark i put on a msd tfi coil and if fixed taht problem then i installed a pms and im having all kinds of problems tuning. It falls on its face around 4 grand then picks back up around 5 anyone have this sort of problem i put in the base tune on teh stang tuning forum and changed a lil bit here and there for it to run better but its not quite up to par. the A/F is 10 at wide open throttle then leans out a little bit in higher RPM its starting to spit around 5500 too almost like a revlimiter or something not real sure there any help or ideas would be appreciated
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#2 |
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Doc
1986 SVO
48.47@ 12.58
Join Date: Nov 2006
Posts: 37,050
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plugs gapped correctly?
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#3 |
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Newbie
Join Date: May 2008
Posts: 8
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plugs are gapped around 30-33 i believe i'm thinking its something to do with tuning though....
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#4 |
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MM Fanatic
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What is your fuel pressure while under boost? 24# injectors with 14# boost seems like a combination that screams lack of fuel. I know you said the A/F is about 10 and starts to get a little higher, I wonder if it get a "little higher" really quick and flops.
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#5 |
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Regular
1987 mustang lx 5.0
Join Date: Mar 2008
Location: El Paso, tx
Posts: 82
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Are you using a laptop to tune it? If so then you might need to fool around with the air/fuel ratio chart or just set it back to the default settings
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#6 | |
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Hardcore Enthusiast
95 opalfrost gt
Join Date: Nov 2006
Location: Connecticut
Posts: 1,516
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Whats the A/F when she starts spitting? 10.? at WOT seems a bit rich I would shoot for 11.8:1-12.0:1. Can you post a screen shot of your dattalog?
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![]() 5.0 magazines 94-04 performance mustangs feature car! Fall 2010 |
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#7 |
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MM Fanatic
Join Date: May 2007
Location: Bloomington, IL
Posts: 4,737
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10:1 even on a wideband isn't a real number. It basically means it is too rich to be read accurately.
Are you using an FMU?
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88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it
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#8 |
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MM Fanatic
1990 LX hatch
Join Date: Aug 2006
Location: Hobart Indiana
Posts: 4,391
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Maf transfer function data, IMO
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#9 |
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Newbie
Join Date: May 2008
Posts: 8
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yes its definately needs leaned out a little bit in lower rpm WOT but around 5500 its starts to lean out to around 11, I dont have the data log software hooked up yet nor am i sure how it works
fuel pressure spikes to 100 when i get on the throttle and im pretty sure it stays up there through out the ranges i am using a FMU with a 8:1 disc i guess im just gonna haft to delete the FMU and go with 42's. I just dont see why it did'nt do it before i put the pms on |
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#10 |
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MM Fanatic
Join Date: May 2007
Location: Bloomington, IL
Posts: 4,737
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the FMU isn't the problem and sounds like it is functioning normally.
you probably need to tune the FMU with a bleeder valve and/or different calibration discs (I have a whole set if you are interested, including a 7:1 and 6:1). Disconnect the PMS and see if you are still having the same problem. get that thing on a dyno so it can be tuned.
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88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it
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