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Old 05-03-2010, 09:42 AM   #1
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M&Aeller's Avatar
Winnebago Owners Club
Texas Boomers Club
Join Date: May 2007
Location: PointBlank, Texas
Posts: 156
TS Performance MP-8

I have a 2005 Winnebago Journey DP with a 350 Cat C7 on a Freightliner chasis. The coach has about 28,000 miles on it and I decided to do something to boost the performance and maybe increase my fuel mileage. I had the full M3 maintenance performed on the engine at 20,000 miles.

First thing I did was open up the air flow to and from the engine. I added a new AFE air filter but rather than put in the same size filter, I installed a larger filter. The OEM filter had a capacity of about 960 cfm and the new larger one has a capacity of about 1550 cfm. The hose size into the old filter was 6" and was 5" coming out but since the the inlet and outlet hose size for the new filter housing was 7", I swaged up at the air intake duct and ran 7" all the way to the new filter and out of the filter and swaged back down to 5" at the engine.

I also replaced my OEM muffler with a new AeroTurbine 5050XL muffler on the exhaust. The inlet and outlet piping size was already 5" so I did not have to make much modification to this system except to do a little cutting to get everthing to fit properly.

By letting the engine breath better I noticed that the coach was a lot peppier. It accelerated quicker and I was able to merge into traffic quicker and was able to pass slower traffic quicker. The trans also seeemed to downshift faster and it got to 6th gear faster than before, but this may be a figment of my imagination since I did not take notes on this before.

The final thing that I did was to install a TS Performance MP-8 chip to the engine. So basically I added the 3 items that seem to be the most recommended in many of the threads on this forum. I cranked up the setting to the full 30% to see how the engine performed. Last weekend I drove about 50 miles to a campground where we stayed for the weekend. After I got there I noticed a lot of soot on the coach just above the tailpipe. I never had soot on the coach before, so I washed it off. Then on the way home I noticed that when I started up from a dead stop, like at at stop sign, the exhaust would belch out a big cloud of black sooty exhaust just like you see from city buses and 18 wheelers. Black exaust means unburned hydrocarbons which means poor combustion in the engine.

So.........my question is this. Is this the normal operation with the MP-8?? If not, what is going on here?

I turned the MP-8 setting back to the stock setting (which basically deactivates the chip). When I drove the coach back to the storage lot, I did not notice black soot belching out of the tailpipe anymore but I did notice just a hint of dark exhaust when starting from a dead stop. Again I never looked for this before so I dont know if this is the normal operation of a diesel engine. As I said, I never had soot on the rear of the coach before.

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Old 05-03-2010, 11:48 AM   #2
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Join Date: May 2005
Location: Milford,CT.
Posts: 1,147
I dont know anything about the MP-8 But my TS flip chip will smoke like a freight train in the 140hp race setting. To get rid of the smoke bigger injectors,turbo. What size is your exhaust?? Can you return te MP-8? If so I would call DP Tuner and talk to Jody he is the top in the game with these things.
1998 36ft Country Coach Magna #5499
Gillig chassis with a Detroit series 40
2002 F250 CC 7.3 PSD
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