Put mbrp muffler on....
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Elder User
Joined: Jul 2006
Posts: 601
Likes: 0
From: Leesburg GA
Put mbrp muffler on....
Well i have cut the nuts off my truck today 
I had it straightpiped and today i decided to bring it to the muffler shop and have them take out the delete pipe and put the high flow muffler.. There is a HUGE DIFFERENCE in sound which is the reason i wanted to put it on, i couldnt handle the drone at 75-80 mph! Now i dont know what to do... im torn ! It feels like it has lost some of its get up and go BUT that might just be bcz it doesnt roar like b4 and it rainy and humid today...someone assure me i havent lost any power bcz of a dang nab muffler :!!
I had it straightpiped and today i decided to bring it to the muffler shop and have them take out the delete pipe and put the high flow muffler.. There is a HUGE DIFFERENCE in sound which is the reason i wanted to put it on, i couldnt handle the drone at 75-80 mph! Now i dont know what to do... im torn ! It feels like it has lost some of its get up and go BUT that might just be bcz it doesnt roar like b4 and it rainy and humid today...someone assure me i havent lost any power bcz of a dang nab muffler :!!
Got Diesel?
Joined: Jan 2004
Posts: 4,345
Likes: 22
Changes to the exhaust system do cause the computer sensors to modify their readings and cause "low power" issues. Wit the varialble vane turbo, the reduction in exhaust back-pressure causes the turbo to change how it works and sometimes creates less boost.
There have been threads on this very topic over the last 3 years... and changing or deleting the downpipe, CAT or muffler causes the lower back-pressure which in theory should create more power.... but it sometimes does not.
Have heard that many like the CAT back systems.
There have been threads on this very topic over the last 3 years... and changing or deleting the downpipe, CAT or muffler causes the lower back-pressure which in theory should create more power.... but it sometimes does not.
Have heard that many like the CAT back systems.
Cargo Master
Joined: May 2002
Posts: 3,271
Likes: 229
From: Gulf Coast, FL
Gee that's ODD!
Please explain then one of Ford's reflashes that disabled the EBPV and how on my Job#2 6.0 the sensor (located on the front of the driver's side manifold PRE-TURBO) senses the lower backpressure THROUGH the turbo?
Please explain then one of Ford's reflashes that disabled the EBPV and how on my Job#2 6.0 the sensor (located on the front of the driver's side manifold PRE-TURBO) senses the lower backpressure THROUGH the turbo?
Cargo Master
Joined: May 2002
Posts: 3,271
Likes: 229
From: Gulf Coast, FL
2003/04 Computer Programming Recall 06E17:
Truck built before 9-29-03 are being recalled to have the computer reprogrammed. The reason for this recall is to correct fuel injection timing during cold operation, EGR valve control, lack of power, check engine light illumination (P02263 or P0299), hard starting and rough running concerns related to Exhaust BackPressure sensor corrosion. Other symptoms not listed in this recall, but which could occur, would be excessive smoke, turbo control and surging at idle or cruise. The new update eliminates the EBP sensor input to the computer. The exhaust backpressure will now be inferred/calculated using other sensor signals. Trucks should be reprogrammed using versions 41.8 or 42.1 or higher.
After this reprogramming, the truck should be test driven, the computer checked for a codes and the codes cleared (even if none are present), the key cycled on for five seconds, then turned off twice, then the engine started and allowed to idle for 5 minutes at operating temperature to allow the computer to relearn the EGR valve closed position value. This is to prevent erronious codes or driveability sysmptoms related to the EGR valve an turbo performance. Broadcast Messages 5452, 5529.
You should notice an increase in turbo cycling closed/whistling at idle and at stops. This is normal, and is to help keep the variable vanes from sticking.
Truck built before 9-29-03 are being recalled to have the computer reprogrammed. The reason for this recall is to correct fuel injection timing during cold operation, EGR valve control, lack of power, check engine light illumination (P02263 or P0299), hard starting and rough running concerns related to Exhaust BackPressure sensor corrosion. Other symptoms not listed in this recall, but which could occur, would be excessive smoke, turbo control and surging at idle or cruise. The new update eliminates the EBP sensor input to the computer. The exhaust backpressure will now be inferred/calculated using other sensor signals. Trucks should be reprogrammed using versions 41.8 or 42.1 or higher.
After this reprogramming, the truck should be test driven, the computer checked for a codes and the codes cleared (even if none are present), the key cycled on for five seconds, then turned off twice, then the engine started and allowed to idle for 5 minutes at operating temperature to allow the computer to relearn the EGR valve closed position value. This is to prevent erronious codes or driveability sysmptoms related to the EGR valve an turbo performance. Broadcast Messages 5452, 5529.
You should notice an increase in turbo cycling closed/whistling at idle and at stops. This is normal, and is to help keep the variable vanes from sticking.
