Tuning file installation

[Bear77]

Your truck has flex fuel?


Sent from my iPhone using Tapatalk

 

[George B]

I left this out of my last post.

What does BlackBear expect for fuel pressure? You may want a different regulator for a non flex? That pressure is higher.

 

[Sam Harris]

I left this out of my last post.

What does BlackBear expect for fuel pressure? You may want a different regulator for a non flex? That pressure is higher.

Not sure. I haven’t heard back for a bit. I know they’re really busy. I’m going to see where it’s at, and go from there. I’ll plan to replace the filter and regulator. And see where it’s at after that (unless it’s reporting correct pressure anyway)

 

[Fless]

Yessir

NBS Flex, KOEO (Key On, Engine Off) fuel pressure spec for V8s is 48-54 psi.

 

[Sam Harris]

So your fuel pressure will be around 42 PSI while idling and jump to 45 off idle.

Hmm. I thought it was supposed to be around 50+. Guess I need to look it up.

 

[George B]

NBS Flex, KOEO (Key On, Engine Off) fuel pressure spec for V8s is 48-54 psi.

My 2003 flex would do 52 KOEO and 42 Idling with a jump to 45 off idle.

 

[Rocket Man]

I left this out of my last post.

What does BlackBear expect for fuel pressure? You may want a different regulator for a non flex? That pressure is higher.

They look at injector data. Notice he said “might have a fuel pressure issue” since it’s leaning out. Duty cycle is probably nearing 100% at WOT which means the injectors are staying open as long as possible in order to get enough fuel through. I had that issue with my 12613412 injectors rated at 50lb/ hr but I have a blower and switched to a smaller pulley. At that point I was at the limit of my pump and MAF as well.

 

[George B]

They look at injector data. Notice he said “might have a fuel pressure issue” since it’s leaning out. Duty cycle is probably nearing 100% at WOT which means the injectors are staying open as long as possible in order to get enough fuel through. I had that issue with my 12613412 injectors rated at 50lb/ hr but I have a blower and switched to a smaller pulley. At that point I was at the limit of my pump and MAF as well.

Did I say something incorrect or are you adding to my post?

 

[Rocket Man]

Did I say something incorrect or are you adding to my post?

You asked what they were looking for fuel pressure so I was just stating they probably weren’t looking at pressure but duty cycle. So they’re probably guessing it’s pressure and couldn’t tell him a specific FP number if that makes sense.

 

[George B]

You asked what they were looking for fuel pressure so I was just stating they probably weren’t looking at pressure but duty cycle. So they’re probably guessing it’s pressure and couldn’t tell him a specific FP number if that makes sense.

Got it.