| Author | Message | ||
| Randi Scott (Superand)
Registered Member Username: Superand Post Number: 1 Registered: 1-2008 Posted From: 67.163.13.110  Rating: N/A |
hello - i'm a newbie by the way..... i have a 6V92T, and just want to know what affects the performance of a Turbo. i had some minor problems the last time out, in that it took a while for the boost to "kick in" ..... like, a few miles up the highway. i had it looked at, and was told it spins fine. i was however VERY low on cooliant - 10 gallons! i have also replaced the air cleaner as it was at least 18 months old. could those things have affected my boost? i have yet to take it back out. thanks in advance for any insight. | ||
| Grant Thiessen (Busshawg)
Registered Member Username: Busshawg Post Number: 23 Registered: 10-2007 Posted From: 207.161.143.46 Rating: N/A |
Welcome Randi, I'm not familair with the 6v92T however with the years of running other diesels up and down the road I don't believe the fact that you were so low on coolant should effect your turbo but you air breathers would definitly effect it. Did the old ones appear dirty or damaged? Did you notice a considerable amount of smoke with the old ones? | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 318 Registered: 8-2006 Posted From: 74.32.88.221 Rating: N/A |
Randi, start by checking for exhaust leaks from the engine to the turbo it may have a broken flange or leak | ||
| Dennis Tracy (Eagle10)
Registered Member Username: Eagle10 Post Number: 26 Registered: 10-2006 Posted From: 64.12.117.73 Rating: N/A |
I have a 1984 Eagle 10 with a 6V92DT. I was losing power and found holes in both exhaust manifolds and the two turbo pipes. Replaced all parts and have much more power. Manifolds not fun to replace. | ||
| Cindy and John (Cindyandjohn)
Registered Member Username: Cindyandjohn Post Number: 60 Registered: 1-2007 Posted From: 70.15.55.179 Rating: N/A |
Randi, We have an 89 model 15 same engine, turbo, etc... most of the time the boost is only around 10 pounds. I get the most power up hills when the turbo boosts up over 12 pounds. On flat ground there isn't much boost. However it does go up and down. You should see it boosting as you start to go. When I first bought our Eagle I had to change filters etc and it did make a difference on the power. Hopefully that will help you. Coolant should have no part in the turbo boost but make sure before every trip you check coolant level - you don't want to toast your engine. 10 Gallons low is a bit extreme... I usually check oil and coolant before each trip as well as when I leave my destination to return home... Hope this helps. Feel free to email me if you have questions. John | ||
| Jack Campbell (Blue_goose)
Registered Member Username: Blue_goose Post Number: 72 Registered: 5-2007 Posted From: 71.101.62.97  Rating: N/A |
Randi I think the turbo boast is one of the most important things to know about your engine. The most important is the engine temp. It is cost very little and dosn't take much effort to put a boast gague on the dash. You should be getting at least 25 in of boast on a hard pull with the turbo wound up. If you have any leaks it will kill your power and can make all types of problems. Jack | ||
| George M. Todd (George_mc6)
Registered Member Username: George_mc6 Post Number: 385 Registered: 8-2006 Posted From: 207.231.75.253 Rating: N/A |
Randi, Turbo pressure is a direct function of exhaust gas output, period. That said, when do you get maximum exhaust output? At full throttle, and just under maximum governed RPM, when the governor (or the electronics) are supplying full fuel rack position. If yours is a DDEC engine, the computer will reduce the fuel injection rate to compensate for the low coolant level, and will eventually cause a complete shutdown depending upon how you have it programmed. With a mechanically injected engine, the only restricting factors are fuel filters, and engine speed. If the engine is at, or very near full governed speed, +2000 RPM, even with the throttle wide open, the fuel racks will not be in the full fuel position, and boost pressure will start to taper off. If the fuel filters are partially plugged, full fuel injection is not acheived, so less burn equals less exhaust, equals less pressure. The question about smoke above is very important, as black smoke is unburned fuel, which indicates not enough combustion air, or worn injectors which do not atomize the injected fuel properly. Bottom line, full boost pressure should occur within seconds of full throttle operation at near full engine speed. If your exhaust system is leaking gas before it enters the turbo, you have less drive on the turbo, so less combustion air output equals back smoke? A dirty air filter will cause intake air restriction, and the turbo will actually spin faster, due to thinner air around the compressor blades, but put less fresh air in the engine... FWIW, George | ||
| Debbie and Joe Cannarozzi (Joe_camper)
Registered Member Username: Joe_camper Post Number: 95 Registered: 10-2006 Posted From: 71.239.202.82 Rating: N/A |
Randi what kind of coolant did you use? Low silicon I hope and you have to put additive in it or cavitation will occur and you will destroy your liners! There are test strips for the antifreeze> Do not go without making it right. Welcome to the forum nice to see someone else from Chicago. We own our own semi and I do 99% of the repairs. If you ever need any help or if you are looking for someone to head out for a weekend trip call us anytime we would love to talk/wrench/meet/camp. 708 243 7871 On these engines exhaust leaks will effect them the most. Do you notice any sooting? The air cleaner would have to be pretty darn dirty to make a difference. (Message edited by Joe Camper on March 20, 2008) | ||
| Randi Scott (Superand)
Registered Member Username: Superand Post Number: 2 Registered: 1-2008 Posted From: 67.163.13.110 Rating: N/A |
thanx to everyone. i also found a small crack in the airline @ the throttle. fixed it as well. test spin yesterday for about 15 miles and she ran like a charm!! how can i tell if my motor is a DD"EC" ?? it did do an "auto shut down" because of the low coolant... and speaking of coolant - an eagle/dd mechanic told me not to worry about the "type" as most HD antifreeze these days have low silicate levels. (Message edited by superand on March 21, 2008) | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 319 Registered: 8-2006 Posted From: 74.32.88.221 Rating: N/A |
Randi, the silicate drop out is the least of your worry about anti freeze on a DD the base is the most important DD calls for a ethylene base anti freeze.What year model is your Eagle if you repaired a air throttle line it is more than likely a manual engine if it was a DDEC it would never started with low water (Message edited by luvrbus on March 21, 2008) | ||
| Randi Scott (Superand)
Registered Member Username: Superand Post Number: 3 Registered: 1-2008 Posted From: 67.163.13.110 Rating: N/A |
my eagle is a 1988 model 15 45 foot entertainer. purchased and converted by ECA in florida. i put in peak long life 150k mile / 5 yr EG based antifreeze. 60/40 mix. | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 148 Registered: 3-2006 Posted From: 209.50.74.42 Rating: N/A |
Randi By the year of your bus it isn't a DDEC engine. You mentioned an air leak in the throttle line. DDEC engines have no throttle linkage. They are fed information from a varible pot attached to the throttle pedal through the computer that is mounted on the engine. Bill | ||
| Debbie and Joe Cannarozzi (Joe_camper)
Registered Member Username: Joe_camper Post Number: 96 Registered: 10-2006 Posted From: 71.239.202.82 Rating: N/A |
If the mechanic that you spoke with did not stress the importance of keeping the PH straight in your antifreeze and the adverse effects of not doing so with the correct amount of additive he has done you a disservice.   You can use these products or get water filters that contain the charge needed but initally a new filter with charge is not sufficiant enough to get it to where it needs to be, new filters with precharge will only maintain the correct charge when it becomes slightly down. |