Fuel press. question

[ApullinV6]

With the saying "leaner is meaner" in mine.

When you go up in fuel pressure is it actually leaning your fuel out. The higher your pressure, the less volume your getting right?

Noticed my O2's went up, when I lowered my fuel pressure.

 

[Black Box]

Vice Versa

When you turn your FP up you are richening, when you turn it doen you are leaning.

Steve

 

[ApullinV6]

Thanks Steve

That's what I had always thought until lastnight when I backed my fuel press. down and saw my 02's go up. That's what got me thinking about it and made me unsure about it. Thanks for clearing it up for me

 

[TurboDave]

Re: Thanks Steve

Originally posted by ApullinV6
That's what I had always thought until lastnight when I backed my fuel press. down and saw my 02's go up. That's what got me thinking about it and made me unsure about it. Thanks for clearing it up for me

That's simply because those that like to fiddle with fuel pressure, forgot to tell you. When you make a fuel pressure adjustment, such as backing it down as you did, the computer compensates for this leaner condition by bumping the blm values UP, adding fuel to erase the fuel pressure change you just made

Now that blm cell 15 (WOT cell) has been bumped up to compensate for the decreased fuel pressure like all the others, guess what; more fuel than you wanted or expected.

Unless you're prepared to reset the ECM immediately before every blast you make, changing the fuel pressure isn't going to accomplish a thing, except screw up the state of tune.

 

[ApullinV6]

Now that blm cell 15 (WOT cell) has been bumped up to compensate for the decreased fu

I guess that's why my readings are not what there suppose to be. Seems like my blm values are always running higher than what they should.
To fix this I need to reset ECM, then I should get a correct reading correct?

Thanks Turbo Dave

 

[TurboDave]

Re: Now that blm cell 15 (WOT cell) has been bumped up to compensate for the decreased fu

Originally posted by ApullinV6
I guess that's why my readings are not what there suppose to be. Seems like my blm values are always running higher than what they should.
To fix this I need to reset ECM, then I should get a correct reading correct?

Thanks Turbo Dave

It'll only be correct for a short period of time, until they learn back in.

 

[ApullinV6]

Thanks again Dave,

It's people like you that helps us new comers get these beast running good.

Hope your enjoying that new house(cabin). It's a beat. place.