Quote:
Originally Posted by Alain V.
On a diesel engine, running a hotter thermostat helps promote ignition and runs a little more efficient.
I have the 3" down pipe because it is the elbow that is bolted directly to the turbo and runs down the firewall.......... clearance at the firewall is very tight. The only way I could have used a 4 inch down pipe would have been to either pound a serious dent in my firewall or lift the cab, which I didn't want to do.
so my 3 inch down pipe replaces the very restrictive pancaked ford down pipe, and once my exhaust gets clear of the firewall it becomes 4 inch all the way to the muffler & tail pipe.
I did not do my mods necassarily to gain power, but to help optimize fuel mileage. I tow a 24 foot enclosed trailer with tools in it and usually about a 2500 pound race car in the trailer.
I also have a pizza box jammed in front of my radiator during the cold winter months as it gets cold here in Kansas.
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That is the reason the 205 degree stat was built. Not sure how much it helps in reality. I know I didn't see anything different mileage wise that was significantly different from stock when I tried it for a couple of years.
I forgot. Earlier trucks had to have the firewall hammered out. Not sure how much restrictions there is in the rest of the system. That is why I didn't buy the cat back system and got the same exhaust WITH the 4 in down pipe.
As to fuel economy, I did see cruising improvement with a PI Stallion torque converter. Using a program suited for economy also helped.