Power loss at WOT - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

 
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post #1 of 9 Old 10-28-2010, 07:10 AM Thread Starter
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Power loss at WOT

I run the Spartan 250 all the time. I am a pretty mellow driver, looking for mileage mostly, but on a rare occasion like to put the heel to the steel. I noticed the other day (and several times prior) that once I floor it, it runs badass for a bit, and then has this noticable loss in power for half a second, then usually takes off again. It is defueling? Is the HPFP not feeding it enough? I used to have a Bullydog PMT while I still had the DPF and CAT, and its a similar feeling to when it was Defueling (Bullydog had a message that said "DEFUELING" when it was actually happening)

I was under the impression that the 250 tune didn't have any safety parameters built in. If so, that's OK I guess, but I just want to know if something is F-ed up with the truck.

Should I make a log file or something to see what's happening with fuel commands and hpfp pressure?
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post #2 of 9 Old 10-28-2010, 08:45 AM
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There are no safety parameters set in to the 250 tune. Is this something you are feeling on top end, or going through the gears?

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #3 of 9 Old 10-28-2010, 09:41 AM Thread Starter
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Going through the gears I think. Surely not at top speed. But it doesn't feel like transmission. It definetly feels like I let off the accelerator slightly, then resume. I'd call it a hiccup, or a stutter.
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post #4 of 9 Old 10-28-2010, 10:30 AM
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Mine does the exact same thing, but only within the first few minutes of being on the road. Once it does it once, it won't do it again till I turn the truck off and start it back up again. Very strange, and I'm only running a smaller street tune from Innovative...

11 F250 6.7 CC/SB -- tuned & deleted -- 3.5'' PMF/ICON/Fox suspension, Method Standards, Toyo AT2s
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post #5 of 9 Old 10-28-2010, 11:00 AM
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Is it just the defuel on the shift? how long does it last? Ive never tried my 250 tune before but ill go try and see if mine does the same thing...

Ford F250 6.4 CC/SB, Spartan 350 w/TCM, Mag-Hytec deep pan, Flo-Pro 5 inch Exhaust, AFE stage 2 with ProDRy, 2.5 Readylift, ZEX Nitrous single stage, BD CAC pipe, ATS 5-star converter, elite egr delete/wastegate, ts mp-8 stacked, Procomp traction bars, locker, CFM plenum, ARP studs. Innovative tunes and Suncoast on the way!
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post #6 of 9 Old 10-28-2010, 11:17 AM Thread Starter
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Nah, its for sure between shifts. After TripleE44's post, I got to wondering if maybe it was still cold when I was hogging on it. That may have something to do with it.

I drove the Harley today (getting a bit cold for that..) but I think next time I have the truck out, I'm going to set up a log file, crank it up a time or two and see if I can catch a fluxuation in any of the parameters. Maybe that will explain what I'm feeling.
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post #7 of 9 Old 10-29-2010, 08:31 AM
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My rcd 485 was doing this as well. It would pull like a raped ape then all of a sudden it would feel like it lost all power, the tranny would shift to top gear and it will keep going. I was told that my tranny was slipping 5th gear because of too much torque and i needed a new tranny. The first time it happend i though I blew up my motor.

It was the easist fix ever....pull the cover off your airbox and try again. Turns out that even with my AFE drop in air filter I was still starving the truck. Even though the filterminder would never move it still wasnt enough air.

Give it a go. I run without my cover on now and it is like driving a whole new truck!!! Turbo spools quicker, and the whistle is pretty bad *** and it sounds like i have a blowoff valve when i let off the throttle now or when the truck shifts and the boost drops.

My Little Truck
2008 F350 FX4 Superduty Fully Loaded
6" Frankenstein Lift
20" Jessie James Rims
35" Toyo MT
Chrome Steps and Box Rails
Jackrabbit Sliding Bedcover
Eclipse Navigation/DVD with Rear TV's
SCT9625OR , Powerstroker67 DPF/DOC and 4" MBRP

My Big Truck
1991 Toyota 4runner
Solid Axle Swap
19" over Stock using F150 leaf springs
D60 Front 14BFF Rear
Detroit Locker up front, Mini Spool in the rear
39.5" TSL on Custom Hummer Beadlocks
Custom Baha Fenders
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post #8 of 9 Old 10-29-2010, 09:57 AM
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That's an interesting thought, my truck came with an air raid intake, and I always wondered if it was even doing it's job.... Wondering if it's time to clean or just get new intake all together....?

11 F250 6.7 CC/SB -- tuned & deleted -- 3.5'' PMF/ICON/Fox suspension, Method Standards, Toyo AT2s
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post #9 of 9 Old 10-29-2010, 11:56 AM
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its worth a try. My filter has 10,000kms on it all highway and it still does it...but it was the box not the filter restricting me. Hope you figure it out.

My Little Truck
2008 F350 FX4 Superduty Fully Loaded
6" Frankenstein Lift
20" Jessie James Rims
35" Toyo MT
Chrome Steps and Box Rails
Jackrabbit Sliding Bedcover
Eclipse Navigation/DVD with Rear TV's
SCT9625OR , Powerstroker67 DPF/DOC and 4" MBRP

My Big Truck
1991 Toyota 4runner
Solid Axle Swap
19" over Stock using F150 leaf springs
D60 Front 14BFF Rear
Detroit Locker up front, Mini Spool in the rear
39.5" TSL on Custom Hummer Beadlocks
Custom Baha Fenders
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