AMS 373whp & 388whp -EVO X
wow, im truely impressed with the numbers you guys have made so far. i also had very big doubts about the 4B11 in general compared to the 4g63, but after all your testing/mods i think it has changed my mind as well as many others. cant wait to see what kind of power more of your mods bring!
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Joined: Mar 2008
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From: Mount Prospect, IL
You can't just look at boost, you have to look at cylinder pressure. If the boost is high and the timing is low then the cylinder pressure won't be as high and thus the torque won't be crazy. Again if we had control over cam timing and ignition timing I would expect another 50-60 ft-lbs of torque out of this thing. So it's really the torque which is a result of cylinder pressure that will put stress on the engine/head gasket/head bolts/pistons/rods 
For reference HP rating of engine components is not really a correct way to rate them. HP is a result of torque and engine RPM, and the more torque you can carry at higher RPM's the more HP you will make. A good example is a diesel engine, even though a Cummins 5.9 L turbo diesle make only a little over 300hp it makes over 600ft-lbs of torque, and the pistons, rods, block are very stout, it makes gasoline parts look like flimsy toys. The very high cylinder pressure creates high torque. The typical diesel engine does not have good volumetric efficiency (Delivery Ratio) at higher RPM's as it's not designed to operate in that region, so the horsepower isn't high, but the torque is huge.
High horsepower is relative, for example, 200hp on 1.5L NA car might have to happen at 8500 RPM, while 200hp on a 3.0L NA car can be made at 6000 RPM. To spin to 8500 RPM the internal components on the 1.5L will need to be able to handle the the rapid change in piston velocity (Acceleration) , so here high strength rod bolts, light weight pistons, strong wrist pins, ect will need to be used.
Sorry to go on a tangent but just wanted to explain torque, hp and the component needs associated with them.
For reference HP rating of engine components is not really a correct way to rate them. HP is a result of torque and engine RPM, and the more torque you can carry at higher RPM's the more HP you will make. A good example is a diesel engine, even though a Cummins 5.9 L turbo diesle make only a little over 300hp it makes over 600ft-lbs of torque, and the pistons, rods, block are very stout, it makes gasoline parts look like flimsy toys. The very high cylinder pressure creates high torque. The typical diesel engine does not have good volumetric efficiency (Delivery Ratio) at higher RPM's as it's not designed to operate in that region, so the horsepower isn't high, but the torque is huge.
High horsepower is relative, for example, 200hp on 1.5L NA car might have to happen at 8500 RPM, while 200hp on a 3.0L NA car can be made at 6000 RPM. To spin to 8500 RPM the internal components on the 1.5L will need to be able to handle the the rapid change in piston velocity (Acceleration) , so here high strength rod bolts, light weight pistons, strong wrist pins, ect will need to be used.
Sorry to go on a tangent but just wanted to explain torque, hp and the component needs associated with them.
So at this point Martin, would you care to take a shot in the dark at what you think the 4b11 is capable of before needing a build (all bolt ons, bigger turbo, fuel, tuning, etc)?
