dcmdon
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- Don
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There is an engineering concept known as Brake Mean Effective Pressure. BMEP.
The idea is that this number represents the average pressure inside the cylinder during the power stroke.
There are 2 ways to make more power. 1 is to rev an engine faster. The other is to raise BMEP.
A normally aspirated engine can only fit so much air/fuel into the cylinder. So the BMEP is capped at roughly 150 psi. This indicates how much stress the internal components such as the head gasket, cylinder head studs, piston, rings, connecting rod, and crank shaft must deal with as a result of combustion forces.
If you boost an engine the BMEP can get well above 250 psi. So clearly more stress.
The other issues relate to things like:
1. cooling. More power = more heat
2. engine programing = the stock ECU may or may not be able to manage all the variables when boosted. In our trucks it seems that DaveCS can make them work pretty well.
But even that can be ruined if you bring the truck into a dealer and they reflash the system in a way that changes how variables work and his tune no longer works.
The reality for our trucks is that there is NO turn-key solution. If you want your truck to have stock reliability as a daily driver, then leave it stock.
I went on teh forced induction forum and asked if there was anyone who had installed one of the major supercharger or turbo kits who experienced a turnkey solution. I did not get a single reply.
This is not to say it can't be reliable. But it will involve fiddling with a custom tune, which might then be ruined when your truck's software is updated by Jeep.
Engines are stressed based not on how much power they can make. They are stressed based on how much power they are actually asked to make. So if you put a supercharger on your truck and only occasionally get on it getting on the highway, its going to last much longer than if you use your supercharger so that you can maintain 70 mph towing a 7000 lb trailer over the Rockies on a regular basis.
The idea is that this number represents the average pressure inside the cylinder during the power stroke.
There are 2 ways to make more power. 1 is to rev an engine faster. The other is to raise BMEP.
A normally aspirated engine can only fit so much air/fuel into the cylinder. So the BMEP is capped at roughly 150 psi. This indicates how much stress the internal components such as the head gasket, cylinder head studs, piston, rings, connecting rod, and crank shaft must deal with as a result of combustion forces.
If you boost an engine the BMEP can get well above 250 psi. So clearly more stress.
The other issues relate to things like:
1. cooling. More power = more heat
2. engine programing = the stock ECU may or may not be able to manage all the variables when boosted. In our trucks it seems that DaveCS can make them work pretty well.
But even that can be ruined if you bring the truck into a dealer and they reflash the system in a way that changes how variables work and his tune no longer works.
The reality for our trucks is that there is NO turn-key solution. If you want your truck to have stock reliability as a daily driver, then leave it stock.
I went on teh forced induction forum and asked if there was anyone who had installed one of the major supercharger or turbo kits who experienced a turnkey solution. I did not get a single reply.
This is not to say it can't be reliable. But it will involve fiddling with a custom tune, which might then be ruined when your truck's software is updated by Jeep.
Engines are stressed based not on how much power they can make. They are stressed based on how much power they are actually asked to make. So if you put a supercharger on your truck and only occasionally get on it getting on the highway, its going to last much longer than if you use your supercharger so that you can maintain 70 mph towing a 7000 lb trailer over the Rockies on a regular basis.
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