[delldoe]

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

[HMUSN]

plugs gapped correctly?

[delldoe]

plugs are gapped around 30-33 i believe i'm thinking its something to do with tuning though....

[nolife]

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.

[white nite]

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

[95opal]

Originally Posted by delldoe 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

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?

[ryans88gt]

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?

[JBIGBOOTSY]

Maf transfer function data, IMO

[delldoe]

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

[ryans88gt]

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.