Low on power and terrible mileage after Rev X Booster? - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 03-25-2013, 01:14 PM Thread Starter
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Low on power and terrible mileage after Rev X Booster?

Hey Guys-

I recently noticed a dramatic loss of power, and terrible MPG. I just had my turbo replaced with the Garret powermax about a month ago, fresh oil change, fresh fuel filters, clean air filter. The only thing that I did do weas add some Rev X Booster in the previous tank. Is it possible this has affected something in the fuel system negatively? My last tank I netted about 10mpg driving freeway.

Assuming it's just a coincidence, what are the next logical steps to diagnose? Currently there are no codes, FICM is 48.5-50 volts via my SCT Livewire. Batteries are 13.5v, engine coolant temp and oil temp never see more than 8-10 degree delta. What else should I be monitoring to help narrow down the issue? At this point, if I have a stock tune in, I have to mash the peddle just to get to a reasonable cruising speed on the freeway unloaded.

Mods:
2007 F-250 4x4 w/55k miles
AFE Intake
Garret Powermax Turbo
SCT Livewire with both innovative and Vivians tunes (currently stock while diagnosing)
4" Turbo back exhaust (no cat)
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post #2 of 5 Old 03-25-2013, 02:05 PM
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Check your boots on the intercooler pipes... More than likely one of them is cracked.


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post #3 of 5 Old 03-25-2013, 02:08 PM Thread Starter
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I pulled them all off and cleaned them about 3 weeks ago, they looked to be in great shape then. I will check them again to be sure. Again, the truck only has 55k miles on it, so I haven't seen too many items that show much visual wear.
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post #4 of 5 Old 03-27-2013, 08:26 AM
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What is the boost like in stock tune? Very slow to build boost, any smoke, whats your fuel pressure?


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2003 Silver 6.0L PSD CC/SB FX4
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post #5 of 5 Old 03-27-2013, 01:38 PM Thread Starter
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Builds boost off idle just fine, no smoke, and unsure of Fuel Pressure. It feels like it makes decent power off idle, then it's just flat. The turbo has about 500 miles on it, so I am leaning towards fuel system issue. I am dropping it off at the dealer today to have them diagnose.
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