Turbo6Smackdown
Well-Known Member
- Joined
- Dec 31, 2005
How does the octane requirement work in turbo diesel cars? When you turn the boost up, what do you do about the fuel?
How does the octane requirement work in turbo diesel cars? When you turn the boost up, what do you do about the fuel?
Wouldn't it make sense to tune the truck where it burns all of the fuel that is blowing out of the exhaust which equals more power for the same amount of fuel consumed?
Why do the heavy hitters smoke?
Yes; that’s what the new “clean” diesels do.Wouldn't it make sense to tune the truck where it burns all of the fuel that is blowing out of the exhaust which equals more power for the same amount of fuel consumed?
What’s a little smoke when you’re looking for big power?Why do the heavy hitters smoke?
You could; but unless you can add more fuel to the greater amount of air; you won’t make any more power.I see. So could I turn up the boost on say, a disel rabbit?
Because the CN is standardized by country/region; you don’t get a choice.When I go to the pump, I don't normally see choices of desiel fuel... why is that?
Only the efficient burning of fuel will make power. Adding fuel that won’t get burned; or unneeded air (oxygen) won’t make more power.If you could cram more air in, it would make more power, but adding the fuel itself makes power too. Bank's Duramax doesn't smoke, but he is running alot of nitrous.
Both engines work by the combustion of fuel with oxygen. It’s the ignition source that is different.Turning up the boost won't really make too much more power without more fuel. Air isn't the primary power maker. It is just needed to complete the combustion process. Gas engines work off air, diesels work off fuel.
Well; hummm. There will be additional heat generated as a byproduct of generating additional power; but if properly designed and tuned; the EGT will not be higher at increased load or power levels.Diesels need 2 things to make power fuel and air, the more you and the power you get. The more power you make the more heat it makes.
EGT HEAT KILLS DIESEL!
you can run most diesels all day long working them HARD and not hurt them as-long-as you don't get them HOT.
If you could cram more air in, it would make more power, but adding the fuel itself makes power too. Bank's Duramax doesn't smoke, but he is running alot of nitrous.
Turning up the boost won't really make too much more power without more fuel. Air isn't the primary power maker. It is just needed to complete the combustion process. Gas engines work off air, diesels work off fuel.
Most (except very new) diesels don’t have a MAF or ECM.So are you telling me that when the maf starts to see more incoming air, it doesn't tell the ecm to give more fuel??? I'm lost...
Neither gas nor diesel needs a MAF or ECM. The coolest diesel I ever saw was a diesel jack-hammer. Just had a fuel tank and a big filter element.Both engines work off of fuel AND air, or they wouldn't have an air filter and a gas tank... What I'm trying to figure out is, there HAS to be an computer controlled adjustment of fuel, as more/less air is being pushed thru... Is that computer NOT not adjusting fuel for air? When more air is starting to get sucked thru that maf, doesn't more fuel get added regardless?
Gas engines only have this for carburetion. They will run fine with a well designed drip system and no manifold and no carburetor.You control power and rpm's in a gas engine by regulating air (throttle blade). In a diesel, there is no throttle blade, you just add fuel, the air comes from rpms and/ or boost. The roll of air and fuel are almost reversed. A gas engine could not be run with an open intake manifold, and adding fuel to control rpms.
I think the confusion begins with not every gasoline engine is a 3.8 SFI Turbo Buick engine; and not every diesel is electronically controlled either.Adding more boost won't add more fuel. The amount of fuel is controlled by injector pulse in the computer program. The computer won't give more fuel because it sees more air. The purpose of a mas on a diesel is to add fuel in proportion to airflow to make complete clean combustion. The computer won't go beyond if it sees more air, because it isn't lean, it is oxygen rich, which has no negative effects. If you have ever seen an old mechanical 12 valve Cummins, they smoke alot, even when driving normal. They have no air metering capabilities.
If you are adding more fuel and getting black smoke, it is burned fuel. Adding a bigger turbo will clean it up, meaning more efficient combustion, which is more power. White smoke is unburnt fuel. The smokiest tune isn't always the most powerful, but will most likely run hotter. I have a 100hp program that smokes more than a 150hp program.
In a diesel, the fuel is making the power. The air is needed to make complete efficient combustion. Without excess fuel, more air will do little to nothing.
Oh. So what do you do to a turbo diesel car, to make it go faster?