Should you increase fuel pressure when you increase boost?

[rb68rr]

Added a little xylene and turned up the boost to 19 lbs. today and noticed the 02's dropped to the 720's at around 90 mph! This is on an 18 degree street chip. Fuel pressure is set at 43 lbs. static. Should you raise the fuel pressure a certain number of pounds when increasing the boost to get the 02's back up? BTW, there was no knock. Thanks, R.B.

 

[TT/Ameasap]

Ideal 02 readings are 740- 780's ..... you seem to be running a little lean. Up the fuel pressure or drop boost in half psi incriments. Check plugs to confirm your readings (light brown is usually desired).

HTH
Bo

 

[rb68rr]

Thanks for the reply Bo. Even though the 02's are that low it was still not showing any knock on the Scanmaster. Will this hurt the car? When are 02's too low? Or do you just tune for zero knock? Thanks, R.B.

 

[TT/Ameasap]

You have to compensate for cold weather or you will get KR at some point and at that lean you will be replacing headgaskets in no time. Remember a little KR at a time kills these motors. You have a power plate?

 

[rb68rr]

Thanks. Yes I do have a power plate.

 

[TT/Ameasap]

Ahhh. just seen your sig. looks like your doing good. Up the fuel pressure a little and you should be in range.

This is what I have been shooting for:

Street: 780-810 02 readings (rich)

Strip: 740-780 02 readings (lean)


If it gets cold over hear I usually see 1psi increase or more.

 

[rb68rr]

Cold!!! It doesn't get cold in Florida!!!