Fueling

[danielmk323]

Hello all i m running a gt28r turbo whit a piper 285 and have a 1.2 2nd jet and 0.9 ac jet whit a 3 bar fuel pump on 12 13 psi in in 4th gear at 4000 rpm the afr are getting lean what i do next whit carb to run more boost which jet should i change next

[THE MASTER]

stick a 130 main in and 125 boost correction jet. in and see how it goes

[Markey Mark (BD)]

Measure you fuel pressure to carb while on boost, at that boost level you shouldn't be going lean on that carb set up i suspect you got fuel pressure issue's

[tubbyG]

I would open the second stage up a bit more - to 1.3/1.35 then see what its doing. ;)

[danielmk323]

Measure you fuel pressure to carb while on boost, at that boost level you shouldn't be going lean on that carb set up i suspect you got fuel pressure issue's
before i had the new pump and fit it the 9ac i had a bit of hesitating at 3rd gear at 4k and the afr goes full lean for a split sec and you can fell it to now is ok but like i said is leaning to 13 14 afr and im taking boost from the oe boost line if this help

[jamie_8]

check the fuel pressure to the carb. I had a similar issue and it turned out to be a faulty fuel pump.

[danielmk323]

check the fuel pressure to the carb. I had a similar issue and it turned out to be a faulty fuel pump.
do i need the get it before the fuel reg or after ?

[Brigsy]

Fit a gauge in the fuel pipe that goes from the regulator to the carb, could be a faulty fpr or pump..have you changed the fuel filter recently?? Any splits in the reference pipe that goes to the fpr from the carb top??

[danielmk323]

Fit a gauge in the fuel pipe that goes from the regulator to the carb, could be a faulty fpr or pump..have you changed the fuel filter recently?? Any splits in the reference pipe that goes to the fpr from the carb top??
i fond a bit of fuel on the inlet and was coming from the triangle carb port where it gos to the carb elbow and to fpr but don t think it will be the problem

[danielmk323]

bump