On that one I think it has more to do with the parasitic loss. The power it takes to turn the blower's pulley is substantial. So a blown car making 500 at the wheels might be making 650hp or more at the crank before it has to turn the blower. The same turbo car would be making substantially less power in the cylinders and through the crankshaft to generate the same rwhp. It might be making 570-580.
The numbers provided are just to make a point... I've never actually seen a test that showed the amount of power it takes to run a turbo. It's safe to say though, since the same power at the wheels can be generated with significantly less boost on a turbo car.
It would be cool to build two identical engines, put them on dynos side by side, and have one spin a supercharger while the other one feeds off the supercharger output. See how much it actually takes to drive the 'charger.
On that one I think it has more to do with the parasitic loss. The power it takes to turn the blower's pulley is substantial. So a blown car making 500 at the wheels might be making 650hp or more at the crank before it has to turn the blower. The same turbo car would be making substantially less power in the cylinders and through the crankshaft to generate the same rwhp. It might be making 570-580.
The numbers provided are just to make a point... I've never actually seen a test that showed the amount of power it takes to run a turbo. It's safe to say though, since the same power at the wheels can be generated with significantly less boost on a turbo car.
I've been running a turbo on a DSS Pro Bullet with 331 stroker kit ( stock block, just dressed up @DSS) for 8 years and 30k miles. It can be done , but you must know that you have good air/fuel( gotta have a good wide band, such as Innovate) and don't get too greedy. You must be sure your tune is good. i have been running 10psi on the HP kit, making 511 rwhp and 622 ft. lbls. rear wheel torque. Any questions ,feel free to pm.
It depends on a lot of things, engine size, blower size, pulley configuration, gear ratio etc. Some engines use 2000 hp to turn the blower, some use 15. Turbo is a restriction in the exhaust system to start with so just bolting a turbo on doesn't mean it isn't using any power. Bolt a turbo on a engine with the gate open and see if it makes the same power, I'd put my paycheck it wont.
The extra exhaust piping alone would reduce the power output of a turbo motor vs. a similar n/a motor. In your example the compressor would serve as a restriction in the intake tract. So, of course there would be a loss of power. However, the compressor is not a restriction when it's actually making power, and while added exhaust pressure is the cause of the parasitic loss associated with a turbo, there is also clearly a great deal of thermal and kinetic energy in the exhaust of a motor that goes to waste. This is obviously nothing new to you, bentley. To clarify, I think everyone here recognizes that parasitic loss still exists with a turbo.
Here's a more relevant bet: at a given positive boost pressure on a given motor, given a builder's choice of supercharger vs. another builder's choice of turbocharger, the turbocharger will always make more power/have less parasitic loss.
If that statement is false, despite the fact that it's a very broad generalization that uses the word "always" as part of a condition, I'd be surprised.
Yep I agree with all that 100%. I just hate seeing how everyone says a turbo doesnt use any power and blowers use a ton. Its just not true and so many have been brainwashed like that.
It depends on so much. A F1R on a given engine at 20 psi is going to make more power then say a 72mm at 20 psi because the blower is moving a lot more air. Now say we are compaing to a gt4788, same engine same 20 psi the turbo is going to make more power. There are tons of variables, its hard to compare apples to apples in my eyes they are different animals.
Blowers win races, turbos set records.
Good point to bring up, I would not spin a stock 5.0 past 5800 rpms, I'm more comfortable with like 5400, I think that is a real killer of these motors.Just curious, but what do you spin that engine to?
just keep in mind that just because one person got lucky and was able to make XXX amount of power on XXX amount of boost, nitrous, or whatever . DOES NOT mean that it will work on your set up. many variables to consider when talking power adders of any kind, that being said. no matter what you do or how much you spend.....something is going to give at some point! i build my engines to be run hard and do exactly that....run them hard. i have a 100% success rate on finding the weak link eventually. sometimes you get lucky......sometimes ...not so much.
I've been running a turbo on a DSS Pro Bullet with 331 stroker kit ( stock block, just dressed up @DSS) for 8 years and 30k miles. It can be done , but you must know that you have good air/fuel( gotta have a good wide band, such as Innovate) and don't get too greedy. You must be sure your tune is good. i have been running 10psi on the HP kit, making 511 rwhp and 622 ft. lbls. rear wheel torque. Any questions ,feel free to pm.