quick boost question
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From: Braham MN
quick boost question
Does any one know of a formula for figuring out how much a one pound increase in boost pressure will result in horsepower output. or anything of this thought. I was told once that a one pound increase in boost results in a three horsepower increase but I dont belive it.
Diesel rod
Diesel rod
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From: H-town, MN
I don't know for sure, but I am boosting around 30psi on the 100hp setting and if you do the math with your calculations it equates to 90hp. I don't know if this is correct but makes sense (sortta). 
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From: Braham MN
hey thanks that does sound like it kinda works out right.
Central MN so you HAVE to know where braham is.
PM me. nice to know that there is another PSD owner in here from MN anyway.
Diesel rod
Central MN so you HAVE to know where braham is.
PM me. nice to know that there is another PSD owner in here from MN anyway.
Diesel rod
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Joined: May 2001
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From: Cabot, Arkansas
If that formula works on diesels it's pure coincidence. You can't simply "add boost" like a gasser and get more power. You have to add more fuel, and the higher boost is a result of the higher drive pressure created by the fuel.
For example. If you disable the wastegate on a completely stock truck, you will have "added" 3-5 pounds of boost, but you have not increased the power output at all, for that you need more fuel.
Honestly, I can't see how that would work anyways. If you take something like a 5.0 and bolt a blower on it, you would be adding something like 90 HP with only 9 PSI.
For example. If you disable the wastegate on a completely stock truck, you will have "added" 3-5 pounds of boost, but you have not increased the power output at all, for that you need more fuel.
Honestly, I can't see how that would work anyways. If you take something like a 5.0 and bolt a blower on it, you would be adding something like 90 HP with only 9 PSI.
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From: Braham MN
Cookie thanks for the input.
I understand what you were saying that you have to add more fuel to get more power. but the added fuel also results in a increase in boost, which seems to me would result in more power. like six of one half dozen of the other. May it was an irrelevant question. I guess what I was getting at was on our PSD someone has already fiugured out how much horsepower we are adding with our chips and programers. on an older Diesel with an injector pump there is no electronics to add the fuel for us. we have to "crank up the pump" to get more fuel, which will result in more boost, and this is where my question comes from.......
On our old 1066 IH with the I-6 414Cid (dont quote the cubes) if we turn up the pump we don't really know how much horsepower we added, but we can measure the boost increase, there for knowing how much horsepower we added by figure it off the added boost.
maybe it's the wrong way to figure it out, i was just curious, cuz she REALLY burns up the fuel, and pours the coals.
but with equipment from the 70's stuff can't get to complicated
Diesel rod
I understand what you were saying that you have to add more fuel to get more power. but the added fuel also results in a increase in boost, which seems to me would result in more power. like six of one half dozen of the other. May it was an irrelevant question. I guess what I was getting at was on our PSD someone has already fiugured out how much horsepower we are adding with our chips and programers. on an older Diesel with an injector pump there is no electronics to add the fuel for us. we have to "crank up the pump" to get more fuel, which will result in more boost, and this is where my question comes from.......
On our old 1066 IH with the I-6 414Cid (dont quote the cubes) if we turn up the pump we don't really know how much horsepower we added, but we can measure the boost increase, there for knowing how much horsepower we added by figure it off the added boost.
maybe it's the wrong way to figure it out, i was just curious, cuz she REALLY burns up the fuel, and pours the coals.
but with equipment from the 70's stuff can't get to complicated
Diesel rod
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From: Rio Rico, AZ.
Diesels are backwards from gassers when it comes to boost. High boost is the RESULT of extra fuel and hot gasses exiting the engine at high velocity. Gassers and boost are just packing in more fuel/air mix to burn. Diesels fuel is injected directly into the cylinders. Never at a Stoiciometric ratio.
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From: Braham MN
[QUOTE=444dieselrod] but the added fuel also results in a increase in boost, which seems to me would result in more power.
SO then whats the advantage of increased boost?? i understand its directly related to the fuel increase. increased fuel will give you more power. but an increase in fuel on a non turboed motor is just beans compared to an increase in fuel on a turboed motor.
I am basing all my of this not off a PSD but a tractor and my experiences with them. our turbo'd one will just spank the non turboed one, the non turboed one reacted very little when we turned up the pump. the turboed one really liked it when we turned up the pump.
Diesel rod
SO then whats the advantage of increased boost?? i understand its directly related to the fuel increase. increased fuel will give you more power. but an increase in fuel on a non turboed motor is just beans compared to an increase in fuel on a turboed motor.
I am basing all my of this not off a PSD but a tractor and my experiences with them. our turbo'd one will just spank the non turboed one, the non turboed one reacted very little when we turned up the pump. the turboed one really liked it when we turned up the pump.
Diesel rod
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