wolfe10 Report post Posted January 16, 2015 The only two common scales on most diesel engine gauges is PSI and column inches of HG. In fact, our last coach had the dash gauge in PSI, while Caterpillar published their specs for the engine in column inches of HG. As long as one knows that a dash gauge reading of 25 PSI corresponds to roughly 50 column inches of HG, no worries. Share this post Link to post Share on other sites
dickandlois Report post Posted January 16, 2015 The only two common scales on most diesel engine gauges is PSI and column inches of HG. In fact, our last coach had the dash gauge in PSI, while Caterpillar published their specs for the engine in column inches of HG. As long as one knows that a dash gauge reading of 25 PSI corresponds to roughly 50 column inches of HG, no worries. Good point Brett! This relates to, · Ambient conditions (temperature and barometric pressure. Barometric pressure is usually given as inches of mercury and can be converted to psi by dividing by 2) Rich. Share this post Link to post Share on other sites
rebootsemi Report post Posted January 16, 2015 My Patriot Thunder 06 has a 05 C-13 525 hp and take it from a old trucker this thing is plenty stout. I get 6-6.5 mpg flat uphill down hill just seems to stay the same. And contrary to what some say you do loose horse power at higher elevations my turbo boost pressure drops from 48 psi to 40 at 10K -11k ft. but your still passing all the trucks and about half of the cars. The C 13 is in the same class as the C 15 which were installed in tons of line haul trucks. It has a 1 million mile before overhaul life. Share this post Link to post Share on other sites
wildebill308 Report post Posted January 19, 2015 Well I had to go check my records but my boost gage reads in psi. I saw no reduction in power that I could measure in my trip this last summer. High boost runs around 35psi I have a tattletale so I have a record of maximum readings. The highest I have observed was 40psi. I don't know if this was momentary or? but that was the highest on the tattletale. I am wondering how people determine they have a reduction in power? Bill Share this post Link to post Share on other sites
timthecarguy Report post Posted February 10, 2015 Anyone have any experience with the C - 15 Cat in 02 - 05 Country Coach good or bad? Share this post Link to post Share on other sites
dickandlois Report post Posted February 11, 2015 Tim, there have been reports of some C-12 and13 engine failures and turbo(s). Can not remember any post regarding C-15 series. Rich. Share this post Link to post Share on other sites
rwilli Report post Posted February 11, 2015 DEF on right rear? So how does one fill the tank? Please don't tell me you have to fill it manually with a bucket--if this is so, it is hard to believe this is a design that will remain for long. Share this post Link to post Share on other sites
dickandlois Report post Posted February 11, 2015 rwilli, Could you post the Make, Model and Year of your coach for the group. Rich. Share this post Link to post Share on other sites
mpierce Report post Posted March 4, 2015 Anyone have any experience with the C - 15 Cat in 02 - 05 Country Coach good or bad? C-15's in 02 and 03 are good. Pre emissions. If late 03 and later, then they are emissions, and not near as reliable. Share this post Link to post Share on other sites
sgureasko Report post Posted March 10, 2015 I keep reading about the improved fuel economy with DEF, and have one question concerning that. How much does the DEF fluid cost and how far or how much does it cost when entered into the "fuel economy" factor. And for those that are thinking about this, I have a '90 Wonderlodge with an 8V92 DD engine, with over 230,000 miles on it. And for younger generation, it's a two stroke that is turbo and supercharged. Share this post Link to post Share on other sites
gbrinck Report post Posted March 11, 2015 The DEF engines buy back some of the fuel economy that was lost with the 2007 EPA changes, but not enough to be better than the pre-2007 engines. Probably better than your old Detroit, though. A 40 foot coach with a 2010 or later engine (with DEF as well as DPF) will probably see around 7 mpg. Larger & heavier coaches with bigger engines are probably a bit less. A 2.5 gallon jug of DEF runs around $12 at Walmart and around $2.80/gallon in bulk. Many truck stops now have DEF pumps along side the diesel pumps. DEF consumption will likley be 2-3% of diesel fuel used, so it's an slight extra cost. Share this post Link to post Share on other sites
jrwitt Report post Posted March 11, 2015 Gary, Just curious. What happens if you are driving down the road and you run out of the DEF? Does the engine keep running? Is there a dashboard gauge to show DEF levels? I know some coaches have a dial near the DEF tank to show levels. Thanks, Jack Share this post Link to post Share on other sites
dickandlois Report post Posted March 11, 2015 Jack, The ECM should give you a warning when the level drops to a predetermined level by the engine manufacture. That warning can be a little different for different instrument clusters . Check this link for some general information. http://www.rambodybuilder.com/iph/iph2014/ph2014/phdocs/phcc/phwarningsystemdef.pdf Rich. Share this post Link to post Share on other sites
jrwitt Report post Posted March 11, 2015 Thanks Rich. I have been wondering about how the DEF system affects the operation. Sounds like it would be a good idea to have a supply of DEF on board just in case. I think I read that it has a shelf life, so will have to watch that as well. Share this post Link to post Share on other sites
