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Old 08-21-2013, 07:15 AM
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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.
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Old 08-22-2013, 06:24 AM
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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!
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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?
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Old 08-22-2013, 12:18 PM
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Lol there's your problem
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Old 08-22-2013, 02:03 PM
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Send a message via Yahoo to flashover1969
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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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
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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...
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Old 08-27-2013, 06:05 AM
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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.
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