Compression Ignition Addict
Join Date: Aug 2007
Location: New Brunswick, Canada
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I have been on a southern trip with the trailer in tow and have noticed great power and fuel mileage with the Programmer set at 80HP and the EGR blocked off.
When starting while the ECT temperature is under 190F I have noticed that the Boost pressure sits at no more then 5 PSI.
Its a bummer when you try to take the highway but then the truck heats up fast and in no time I am at normal boost pressure once 190F hits.
I feel that the turbo vanes are closed and the EGR is programmed as a bypass, and its no longer there to create intake manifold pressure thus starving the motor.
With a proper EGR delete tune I feel that this turbo lagging would be programmed in.
I can live with it because this truck has always had pour mileage on heatup anyway, even before the EGR delete, but had better cold power.
Before I upgraded the thermostat I tried to disconnect the EGR valve and noticed that I could not heatup the Coolant past 178F so never unhooked it again. Its great now with the new 190F thermostat, While towing I see 191F/195F all the time. You might have a thermostat problem, I think the vanes close to heat the engine if stuck under 180F. And with the EGR the recycle exhaust heats up the intake air for better combustion.
2005, 6.0L, 6 Spd Std, 3.73 Rear End, F250SD, Extended Cab, 4 x 4 Long Bed. 2008 extension mirrors. GPS/TV/DVD/CD/Rear Cam/Radio installed, Max Energy programer by Hypertech, and Fuel Pressure Gauge. ScanGaugeII for 60 plus XGauges, and MPG. ELC Cat EC-1 Coolant, Pull a 39ft 15500Lbs 5th Wheel Camper Trailer. Mileage Avg is 20MPG, and pulling 12.6MPG.
Last edited by caissiel; 11-30-2010 at 08:23 PM.