cat removal/MPG increase?

[StephenJohnson]

I have an 03 ho 3500 qc srw 4x4 gets 17-22 mpg calc. Ny mega 2500 4x4 gets 17 max. Same frame size & wieght truck only diff seems to be cats on the Mega. Will an mrpb test pipe solve my mpg woes ?

 

[JVolpe]

I doubt you would see enough mileage gain to measure it consistently. It took over 20,000 miles before my mileage really improved a lot. Of course that was when most of my current mods went on so I am not really sure what caused it. I use to never get over 17mpg highway and all city was 13mpg at best. Now I get 15+ city and 19-20mpg on the highway at 75mph.

 

[Semicrazy]

The cat removal may help a little... but some people on the forum have reported that the third injection event hurts the 600/610 engines the most for mileage. This third injection event was added I believe to help keep the cat in the optimal temperature range to work it's magic.

 

[steved]

The cat removal may help a little... but some people on the forum have reported that the third injection event hurts the 600/610 engines the most for mileage. This third injection event was added I believe to help keep the cat in the optimal temperature range to work it's magic.

I agree with this statement, I saw very little if any mpg improvement from losing the cat... I may even reinstall it shortly to cut the noise down.



steved

 

[DerekW]

I gained 2 MPG city by building my own test pipe for my 2004. 5 and I have a heavy foot to get through traffic.

 

[DerekW]

I used 4" pipe and swelled it just a little on the exhaust bender. its not that big of a project is you have a buddy who has a exhaust bender and the parts to swell 4" pipe. I actually worked at a 4wd center at the time and had nothing to do. took 20 minutes to sawzaw of the old crap (added it to the other 4 test pipe install remains out back), swell the pipe, weld it in, make a new hanger by bending 5/16ths rod in a vise to make a hanger and weld it in. I love it. if I got in the gas hard I could get wrote a citation but I would fix, get inspected and go right back to straight pipe. Its worth the work It saves me 628 gallons per year cuz I avg 80,000 miles a year.

 

[BBowers]

I gained about 0. 4 mpg from waht I could tell from the overhead when I cut my kitty off temporarily on my last truck, a 2005 3500 ram 4x4 quad cab drw, running empty, so yes there seems to be a bit of mileage to be had. Smoked less too! Very little increase i noise, just a little sharper instead of smooth and mellow. had to put it back to sell it. I got rid of my rig with 27,000 miles and it never got over about 20 on flat ground, stock tires, 55 mph, empty. Other than that it was a great truck, just too big for me! i also had bullydog tripledog on it, true flow filter(worth 0. 5 mpg), gutted turbo silencer thingy. tripledog brought about 1 mpg more running on tow/economy.

 

[DerekW]

I gained about 0. 4 mpg from waht I could tell from the overhead when I cut my kitty off temporarily on my last truck, a 2005 3500 ram 4x4 quad cab drw, running empty.

I have the same truck you had only 2004. 5 which is the same thing. But let me point out to you the overhead console is consistantly inconsistant when it cones to MPG. You have to calculate you fuel economy at fill up. otherwise you are truely blinded of accurate truthful digits. I am not the only one who feels this ways diesel power says the same thing.

 

[DerekW]

btw I gained even more mpg by: AFE stage 2 =2mpg, straight pipe=2 mpg, banks technicooler with high ram intake brought it up more but haven't measured yet cuz i just installed, removed inside rear tires (too much rolling mass for my needs) also brought it up but haven't measured.