fix running lean?

[ninety1gt]

i just got back from a dyno day where i put out a whopping 193hp ang 222tq, but at a 15.5-16 air to fuel ratio, they said i can gain up to 30 hp just by bringing down the ratio, so my question is where do i go from here? could my cobra mass air be a problem?? up the fuel pressure?

 

[BlownFiveLiter]

Did they happen to check and, or tell you what your fuel pressure was? I'm surprised you're not having detonation issues more than anything.

 

[ninety1gt]

nope no detenation

 

[vristang]

i just got back from a dyno day where i put out a whopping 193hp ang 222tq, but at a 15.5-16 air to fuel ratio, they said i can gain up to 30 hp just by bringing down the ratio, so my question is where do i go from here? could my cobra mass air be a problem?? up the fuel pressure?

I would suspect the Cobra MAF first.
But the first thing you should do is pull your codes. I have a link in my sig if you don't have a scanner.

With the 70mm Cobra MAF you should be using the MAS from a 94-95 Mustang MAF. If you are using the 93 Cobra MAS, or the stock A9* computer MAS, you will have AFR issues.

Post up the 3-4 digit MAS code for your MAF/MAS.
I think the 94-95 Mustang should be F2VF? I am not exactly sure on that though.


jason

 

[Jaswir]

02 sensor was my cause of running lean... pull the codes and let the computer tell you whats wrong!

check your plugs and see what color they are

 

[ninety1gt]

i took off the cobra mass and put on my stock meter, it feels like i lost a lil hp but it revs smoother, i was going over the vacuum lines and noticed there is no vac line from the charcoal canister i guess from when i removed the smog pump, do i need to connect it to the vac some how?