Lousy dyno numbers

I put my 06 F250 on the dyno at the Bloomsburg, PA truck show this weekend and the numbers have me a little confused and dissapointed. First run put down 382hp 741tq and second run was 357hp 642tq. It seemed to be losing fuel at the top end but I dont understand why. I have the following mods running on 37x13.50 Toyos.
SCT X3 Innovative Race tune
Swamps 58v mild tune ficm
RCD full EGR delete
RCD 205cc injectors
ARP studs
Air Dog 150
regulated return
Bully Dog rapid flow intake w/ CFM+
5" to 7" stacks
custom built stage 5 transmission

Do those numbers seem right for the mods done? I understand the tires rob a goo bit of power but I was hoping for 450+hp and around 900-1000tq. If anyone could help out I'd greatly appreciate it.

These numbers are SAE 90.42* 29.66 in-Hg 34% humidity

Stock turbo? I'm not a big 6.0 guy (Like them, but don't know much about them). Were you losing fuel pressure on the top end?

Yes still running the stock turbo. Not sure about what fuel pressure was like but you could hear the exhaust breaking up a bit in the top end.

turbo is probably holding you back...how many rpms where you turnin at the top? could have been hitting the rev limiter some...what was your fuel pressure reading?

Not sure on the fuel pressure reading. Running about 3000rpm at the top but the torque lines are super jumpy for some reason.

Get a fuel pressure gauge asap. Was it fueling hard? Smoke? Check fuel filters. You should be 450+ for sure. Does it drive abnormally? All boost tubes connected? Did it make boost ? Regulated return regulator showing pressure?

you definitly should be at the 500hp mark with the mods you have. I've heard of guys making nearly 500hp with stock turbo, 190cc injectors and supporting mods. The way the HP numbers were jumping around...seems like the dyno operator didn't know how to operator the dyno maybe.

i'd say dyno operator error for sure. you should definitely be north of 470 i'd think. check all your CAC tubes and get a fp reading.

Should have been way north of that.

I second the fuel pressure gauge. That seems to be neglected all to often, and it can be worth its weight in gold when you are diagnosing something like this or a bad filter ect.

I have a fuel pressure gauge stays steady 18psi during any driving conditions. I didnt think to check the regulator pressure. It did smoke but not real heavy.

I dont think it was the operator (never know though) My buddy dynoed his 6.4 at 518 with his aftermarket wheels and tires and two months ago he put down 540 with factory tires. That seems pretty close.

Im also concerned with the 100ft lbs difference in torque between runs

18, you sure about that number.

18!!!!!!!!!!!!! Should be north of 50psi at ALL times.

18!!!!!!!!!!!!! Should be north of 50psi at ALL times.

Yeah that was what I was trying to get at.

18psi is waaaaaay low. It shouldn't go under 45psi. Mine stays at 60psi. Is the 18psi reading a line pressure reading or is it at the pump? Cause if you're getting the reading at the pump...then it could be accurate cause the airdog 150 is a low pressure pump. My low pressure FASS pump system is 14psi...however overall fuel pressure is 60psi at the aeromotive regulator.

I have a fuel pressure gauge stays steady 18psi during any driving conditions. I didnt think to check the regulator pressure. It did smoke but not real heavy.

lol....oh lawd.

http://i999.photobucket.com/albums/af114/griflan/Gifs/wtf_face_gif.gif

At 18 i don't think those injectors would be very healthy for very long. 18 at the gauge means much less in the injector.

18psi. Well we found your problem:doh:

Not sure as to where the fuel pressure gauge is ran to. The gauge on the regulator reads 70. Sorry guys, I'm not all that mechanically inclined so any help would be appreciated. I know I have a lot to learn in the diesel world

trace that gauge then move it to the top of the motor on the fuel bowl.

18psi of pump pressure is absolutly fine cause it is a low pressure pump. I was running a 0-30psi fuel pressure gauge with the sending unit on my low pressure FASS system and it stayed steady at 14-15psi. However the other fuel pressure gauge at my aeromotive regulator on the engine was at 60psi....and my setup is still running strong. Seeing that you have good pump pressure and good pressure(70psi) at the regulator...the problem seems to be someplace else i think. Now, if you were running a high pressure pump and had the sending unit at the pump and got a reading of 18psi....then i'd be worried. But remember, your 18psi reading is at your low pressure airdog pump....right? If so....you're good to go.

how is your FASS putting out less than 30? mine puts out 55 psi right out of the box. is it a different type of pump?

My FASS that's on my 05 puts out 55 as well.

I'm planning on changin the fuel filters and the airdog filters asap. Also cleaned out my air filter. I take it the fuel pressure gauge is mounted somewhere other than the fuel bowl up top.

unless you put the gauge up there, i'm not sure where it is. if it's tapped into your airdog, then there is something wrong there. it comes from the factory regulated between 50-55 psi for the 6.0.

There are low pressure systems that fuel the stock (or aftermarket) hpfp's, and there are systems that can replace the high and low pressure pumps. My Air Dog is the low pressure type and they now have a newer version that replaces both pumps. If 18 is out of a LP set up feeding a high pressure one (ie you are seeing 70 at the regulator) You should be fine there. It never hurts to change filters though. And drain the water separator as well.

There are low pressure systems that fuel the stock (or aftermarket) hpfp's, and there are systems that can replace the high and low pressure pumps. My Air Dog is the low pressure type and they now have a newer version that replaces both pumps. If 18 is out of a LP set up feeding a high pressure one (ie you are seeing 70 at the regulator) You should be fine there. It never hurts to change filters though. And drain the water separator as well.

i guess all depends on it it's an Air Dog or Air Dog II....

Both FASS and Airdog come in a low pressure "lift pump" that you can use in conjunction with your stock or aftermarket pump. Dodge and Chevy guys use these because they need only lower pressures on the lift pumps to their HP fuel pumps.

The Airdog 2 and some of the FASS are high pressure pumps that can delete your factory system.

how is your FASS putting out less than 30? mine puts out 55 psi right out of the box. is it a different type of pump?

That's because it's a low pressure pump. Your FASS is putting out 55psi because it's a high pressure pump system that eliminates the factory pump....right? I was using it with my factory pump awhile back. Now i'm using it with my high pressure fuelab pump. My FASS low pressure liftt pump feeds the high pressure fuelab pump so the fuelab pump doesn't hafta work as hard. The airdog 150 is also a low pressure pump that is made to be used as a piggy back pump with the factory pump. However the new airdog II is a high pressure pump that eliminates the factory pump. FASS has a series of low pressure pumps and high pressure pump systems.

yeah i figured that....see post #29. i just didn't know that fass made a lpfp system...

A stock 6.0L should have 50-55psi of fuel pressure. Fass and AirDog are all low pressure fuel pumps, which should be set at 55-65psi. We have no high pressure fuel pump in a HEUI fuel system.

Here's some info on how it works:


HEUI - General Info
http://www.cat.com/cda/files/87775/7/pehp9526.pdf

Ford 6.0L Info:

6.0L Bible Table of Contents (http://dan.prxy.org/Truck/6L_bible_html/html/TOC.html)

good info Eric!

The Airdog 2 and some FASS are the 6.0 version of a "high pressure" pump...LOL

Obviously they are nothing like the HP CP3's and whatnot of common rail trucks that are 20k+ psi...

Yeah, I think that there is a little miss communication here. What I meant by HPFP is 55-70 psi that goes into the heads. I apologize if that caused any confusion.

So my 14-18psi should be alright as long as its pressure at the air dog pump? As soon as I get my fuel filters in Im changing the factory and airdog filters. If this doesnt cure my top end fuel cut out does anyone have other suggestions?

And if you still have the factory HFCM (factory pump), or aftermarket pressure pump (Raptor, A1000) after the airdog...

After that, check FICM voltages, ICP, what else...

And if you still have the factory HFCM (factory pump), or aftermarket pressure pump (Raptor, A1000) after the airdog...

Not sure what you were saying here?

VGT SSX for sale - PowerStrokeNation (http://powerstrokenation.com/forums/showthread.php?t=107432)

thinking about going this vgt ssx direction...does this sound like a good turbo to be running with my setup or should I look elsewhere

Take it to the track and you'll know for sure.