turbomax97

iTrader: (6)

now that i have a aem fpr... I'm getting fuel alright as far as being safe it seems.... except at the top end.

I'm hitting 80-85 psi @ 11 lbs boost on the 8:1 fmu....

I'm leaning way out up top right?...


I had a Mustang GT pull hard on me today... sucks.

BigDogJonx

iTrader: (7)

Somethings a tad wrong, cause at 11psi you should be putting out (11x8)+17 which is 105psi on the fuel pressure gauge which you be close to lockup.

you sure you dont have a 6:1 in there? cause 6:1 makes your numbers more aline with the disc. which is right around 83psi when you are at 11psi boost.

Dixit

Bags

iTrader: (3)

I thought the only way to know if your leaning out was using an A/F gauge or EGT gauge ?

Can you use fuel pressure to determine it?

Thanks, sorry for the noob question

Stephen Max

iTrader: (59)

If you have dyno-tuned and you know the optimal fuel pressure you need to be just right and you get less than that, then you know you're running lean. But I would think it would be very difficult, if not impossible, to determine your optimal fuel pressure without a wide-band O2 sensor and dyno-tuning.

turbomax97

iTrader: (6)

well i was using that formula that was mentioned above... and i HAVE to be leaning out if i'm running 15 psi less than i should.... maybe i need to just ditch this pos vortech and get a cartech... i guees i could always try switching discs.