defuel / low boost - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 8 Old 08-21-2013, 07:15 AM Thread Starter
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defuel / low boost

I just got an 08 6.4. Here is what I've done: H&S mini max, gearhead tuned, afe CAI, sinister egr delete with intake elbow, sinister intercooler pipe, putting Sinister 4" downpipe exhaust on tonight. Here's the problem:

When I first loaded the H&S the truck ran great. Now truck starts and runs fine, no codes and no smoke of any color but I can't get more than 15 pounds of boost. Doesn't feel much better than stock. I would say that the first 1/4 of throttle feels normal but theres nothing from there to full throttle. I'm not sure where to begin looking for the problem. Thought maybe I had a leak in the turbo system somewhere but don't see any signs of that and would think I would hear that much boost bleeding off. Any help would be greatly appreciated.

White 2008 F350 Lariat Crew Cab 4x4
Stock wheels, tires and height
Sinister EGR delete with intake elbow
Sinister Intercooler Pipe
Sinister downpipe back exhaust
aFe Cold Air Intake
H&S Mini Max
Gearhead Automotive Tuned
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post #2 of 8 Old 08-22-2013, 06:24 AM Thread Starter
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No responses but that's ok. I got it figured out. When I put the new exhaust on last night it cured the problem. I'm guessing the DPF was clogged. Man, do these 6.4's run!

White 2008 F350 Lariat Crew Cab 4x4
Stock wheels, tires and height
Sinister EGR delete with intake elbow
Sinister Intercooler Pipe
Sinister downpipe back exhaust
aFe Cold Air Intake
H&S Mini Max
Gearhead Automotive Tuned
:
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post #3 of 8 Old 08-22-2013, 10:50 AM
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So you had all this: H&S mini max, gearhead tuned, afe CAI, sinister egr delete with intake elbow, sinister intercooler pipe for a while and was running it like that until you got a dpf delete exhaust?

2010 CC/SB FX4 Lariat.. Tuned By Eric@IDP and Matt@Gearhead

Thinking about getting rid of the stock 6.7 turbo?
Check this out... and research before buying



http://www.powerstroke.org/forum/6-7...ustration.html

http://www.powerstroke.org/forum/6-7...round-2-a.html
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post #4 of 8 Old 08-22-2013, 12:18 PM
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Lol there's your problem

01/07 Job 1 F350 H&S Tuned. ARP Studs, AFE 4'' straight pipe, EGR delete with elbow, AFE stage 2 CAI, 6'' lift on 37s, 20x12 Fuel Nuts two piece, Sinister coolant filter, CCV Mod, Projector headlights HID kit
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post #5 of 8 Old 08-22-2013, 02:03 PM
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yep if you left the DPF on it's like trying to get your turbos to blow out of a straw instead of a 4" pipe.
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post #6 of 8 Old 08-22-2013, 05:50 PM
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I just see his post on PSN. He had been running all that with the stock exhaust. Im curious to what his backpressure was. Surprised he hasn't bent a pushrod. I have to say this is the first time I have ever seen anyone do this lol

2010 CC/SB FX4 Lariat.. Tuned By Eric@IDP and Matt@Gearhead

Thinking about getting rid of the stock 6.7 turbo?
Check this out... and research before buying



http://www.powerstroke.org/forum/6-7...ustration.html

http://www.powerstroke.org/forum/6-7...round-2-a.html
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post #7 of 8 Old 08-23-2013, 11:03 AM
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I'm wondering... I thought you had to run an OFFROAD HD300 tune to go with an EGR delete? Which, if true, would be a bad situation with the DPF still installed... Talk about mixed signals...

2015 F350 DRW Platinum, Lund LED Bull Bar, Rough Country 30" Grille LED bar
2010 F250, H&S Mini Maxx, aFe Stage II PDS, Diamond Eye 4", Pro Comp Nitro 2.5", Bilstein 5100, SmittyBilt Bull Bar, Bushwacker Pocket Style, Rigid LED Flood, B&W Turnoverball w/ Slider, Firestone Ride-Rite, 20X10 Fuel Hostage, 35x12.50 Toyo OC M/T, Pioneer AVH-P4100DVD, Kicker 250.1, (2) JL Audio 10W0v3-4


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post #8 of 8 Old 08-27-2013, 06:05 AM Thread Starter
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You guys are right. Big mistake on my part not doing enough research. I had read about guys tuning trucks with the dpf on but turned off so they didn't void the warranty. Lesson learned and very lucky I didn't do damage.

White 2008 F350 Lariat Crew Cab 4x4
Stock wheels, tires and height
Sinister EGR delete with intake elbow
Sinister Intercooler Pipe
Sinister downpipe back exhaust
aFe Cold Air Intake
H&S Mini Max
Gearhead Automotive Tuned
:
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