Anybody tweak your truck with HPtuners?

**Cutlass** · 05-07-2012, 06:32 PM

And yes I was out there with a tape measure....and the neighbor heard me cussing and asked "Whats a 5.0this?"...J/K

**5.0THIS** · 05-07-2012, 06:32 PM

Originally Posted by Cutlass

I expect nothing less from you

I knew you werent mad about it. Go polish your too big wheels

**5.0THIS** · 05-07-2012, 06:33 PM

Originally Posted by Cutlass

And yes I was out there with a tape measure....and the neighbor heard me cussing and asked "Whats a 5.0this?"...J/K

need vids

**rel3rd** · 05-07-2012, 08:01 PM

Originally Posted by 5.0THIS

I knew you werent mad about it. Go polish your too big wheels

It'll take TWO bottles of polish to do that, LOL...

Sorry....couldn't resist.

**5.0THIS** · 05-07-2012, 09:04 PM

Originally Posted by rel3rd

It'll take TWO bottles of polish to do that, LOL...

yeah, per wheel

**Cutlass** · 03-20-2013, 05:46 PM

I started playing around the DFCO (Decel Fuel Cut Off) settings to make it come on a little more often and see if it'll give me a MPG boost. I'm also thinking about running open loop and leaning out the cruise areas for better mileage. It seems to correct back to stoich when I make changes and run closed loop.

**Firebirdjones** · 03-20-2013, 06:32 PM

Originally Posted by Cutlass

I started playing around the DFCO (Decel Fuel Cut Off) settings to make it come on a little more often and see if it'll give me a MPG boost. I'm also thinking about running open loop and leaning out the cruise areas for better mileage. It seems to correct back to stoich when I make changes and run closed loop.

Those two things give me the biggest mpg gains. DFCO wasn't even working on my wifes car, the rpm activation rpm was never reached during normal cruise.

I keep it in open loop and command the AFR I want in the light throttle cruise areas. Had my wife car this way for a couple years now.

**Cutlass** · 03-20-2013, 06:41 PM

yah, the stock DFCO settings were nearly worthless on my truck too. I lowered the rpm (so it'll come on when I'm above that), raised the MAP sensor enable (so it'll come on sooner), and messed around with the spark enable and mulitpliers (again so it'll get into DFCO sooner). I can feel it working now. I let off the throttle at 70mph...it coasts for a second or so...then the fuel shuts off and it feels like its engine braking. I'm gonna play with it some more.

**rel3rd** · 03-21-2013, 03:45 AM

Originally Posted by Cutlass

I let off the throttle at 70mph...it coasts for a second or so...then the fuel shuts off and it feels like its engine braking. I'm gonna play with it some more.

Mine does that at about the same speeds, but then seems to quickly stop with the engine braking "feel"...in other words, it goes into, but right out of DFCO, so I need to do some tweaking too.

**Firebirdjones** · 03-21-2013, 08:30 AM

Originally Posted by Cutlass

yah, the stock DFCO settings were nearly worthless on my truck too. I lowered the rpm (so it'll come on when I'm above that), raised the MAP sensor enable (so it'll come on sooner), and messed around with the spark enable and mulitpliers (again so it'll get into DFCO sooner). I can feel it working now. I let off the throttle at 70mph...it coasts for a second or so...then the fuel shuts off and it feels like its engine braking. I'm gonna play with it some more.

Exactly, you can feel it kick on and really slow the car/truck down. It's great around the mountain terrain where I live, it kicks on alot.

**Firebirdjones** · 03-21-2013, 08:33 AM

Originally Posted by rel3rd

Mine does that at about the same speeds, but then seems to quickly stop with the engine braking "feel"...in other words, it goes into, but right out of DFCO, so I need to do some tweaking too.

That sounds like the off RPM's probably need some tweaking so it stays on longer. I set mine as low as I can go without stalling when coming to a complete stop. I think I have my "off" rpm at 1100.

If you get too low the engine will struggle to maintain idle or die because the fuel is still cutoff, especially if you have a cam in it. Just have to play with it till you find what works for yours.