...BTW your Bieber avatar is awesome.-Malone
Yeah, I'm no expert. Just kinda a theory. I feel like if there is any over fueling with a diesel it make a hotter environment. With a turbo diesel at least you have the extra air flow, I'm sure it has it cons. Really I feel that it would vary with the type of setups. turbo, intercooler, exhaust size etc. I mean at turbo would create a harsher environment, but hotter? Idk.
With diesel fuel and how it burns doesn't require a flame, which I'm sure you know. Now, diesel engine get hot from over fueling and gassers get hot from under fueling. So if a diesel is putting fuel into the chamber to be burnt for energy, and there isn't quite enough air to completely burn that off it will cause the fuel to slightly burn and become a sooty mess. This is was causes the higher EGTs.. So for a diesel I don't quite is air being the issue, fuel quantity seem to play the role of higher EGTs. Another way to look at it is "how to lower EGTs?" From what I've gathered it get more air in the chamber to burn it all. By adding a good intercooler to the mix you cool the air making it more dense, resulting it be more concentrate so to speak. When that cool air hits the combustion chamber it expands from the heat, making more air to burn the fuel. Cleaning up the exhaust and lowering the EGTs. But that's just one way to slightly lower EGTs. Not that your wrong, that's just my spin on it. I'm no expert.Why does the unburnt fuel cause the high EGTs, maybe something to do with flow? Idk.. but a turbo I could see speed up the process, since most times you have to fuel more to create the boost you want.
Quote from: One_punchmachinegun on October 29, 2013, 12:30:42 amWith diesel fuel and how it burns doesn't require a flame, which I'm sure you know. Now, diesel engine get hot from over fueling and gassers get hot from under fueling. So if a diesel is putting fuel into the chamber to be burnt for energy, and there isn't quite enough air to completely burn that off it will cause the fuel to slightly burn and become a sooty mess. This is was causes the higher EGTs.. So for a diesel I don't quite is air being the issue, fuel quantity seem to play the role of higher EGTs. Another way to look at it is "how to lower EGTs?" From what I've gathered it get more air in the chamber to burn it all. By adding a good intercooler to the mix you cool the air making it more dense, resulting it be more concentrate so to speak. When that cool air hits the combustion chamber it expands from the heat, making more air to burn the fuel. Cleaning up the exhaust and lowering the EGTs. But that's just one way to slightly lower EGTs. Not that your wrong, that's just my spin on it. I'm no expert.Why does the unburnt fuel cause the high EGTs, maybe something to do with flow? Idk.. but a turbo I could see speed up the process, since most times you have to fuel more to create the boost you want. More fuel creates higher egt's because its not completely burned by the time the exhaust valve opens, meaning that it is still burning as it passes through the valve(s) and turbo, thus over temping the turbine, and coking the oil in the bearing.
Quote from: bbob203 on October 25, 2013, 12:25:43 pmI will say after toying around with my girlfriends mk4 ALH this past week doing the tbelt and messing with vag com I've come to more appreciate the electronic system. my problem with the people on TDI club however is they do not want to think outside their box whatsoever anything against the status quo over there gets your head cut off. I'm considering going electronic on my Passat just for something to do this winter. I still plan on keeping my mechanical pump so when the Chinese start blasting us with EMP. thats what i don't like, they're all stuck in a box doing all the same mods, making all these posts like they're engineers and half of what they say is irrelevant or exaggerated or wrong.
I will say after toying around with my girlfriends mk4 ALH this past week doing the tbelt and messing with vag com I've come to more appreciate the electronic system. my problem with the people on TDI club however is they do not want to think outside their box whatsoever anything against the status quo over there gets your head cut off. I'm considering going electronic on my Passat just for something to do this winter. I still plan on keeping my mechanical pump so when the Chinese start blasting us with EMP.
The electronics only assist in diagnosing issues that occur with the electronic engine management. None of those issues can ever occur on a mechanically controlled diesel. I suppose that it is nice to have the easy diagnosis of the slew of issues that you'd never have with an mTDI, but I'd rather just not have those issues and not need to diagnose them...