Hey fellas,
I don’t know much about this as I’m not much of a tuner. From what I’ve read it seemed to be a bigger problem with older cars that used manual boost controllers. You would give it 50-75% throttle but would get full boost. But because you were only at 50% throttle would wouldn’t get enough fuel and the afrs would go super lean and you would get a ton of power. But it was horrible for the engines.
is this a problem with fists/modern cars? I have noticed that the car feels a lot stronger at part throttle in certain situations. i dont stare at the accessport while doing part throttle pulls but I don’t think I ever noticed the afrs go super lean when doing part throttle. But I could have missed it.
anyone know anything about this and whether it affects our cars? And if this doesn’t happen on our cars, why does the car feel way stronger at part throttle?
I have read explanations ranging from
- air velocity is really good for torque, while overall air mass and amount of air is better for high rpm’s. and by only giving it part throttle the throttle body doesn’t open as much, forcing the air to go thru a smaller opening increasing the velocity and efficiency of the engine at Lower rpms
(this explanation makes the most sense to me, there has been a lot of testing on intake manifolds and their design, and how longer and thinner runners are better for torque. And actually a lot of company’s use butterfly valves in their runners to help aid Low end torque. Further giving validity to this explanation, however if this explanation is true, why did part throttle super boost happen and why is it so dangerous to the engine? Manufacturers wouldn’t put butterfly flaps in knowing it would make the engine dangerously lean)
-it’s all in your head because you aren’t expecting the power as much during part throttle therefore you don’t tense your body in preparation (I don’t believe this because if you look it up there are posts on literally every forum about this, and part throttle super boost was at least at one point a real thing)
I don’t know much about this as I’m not much of a tuner. From what I’ve read it seemed to be a bigger problem with older cars that used manual boost controllers. You would give it 50-75% throttle but would get full boost. But because you were only at 50% throttle would wouldn’t get enough fuel and the afrs would go super lean and you would get a ton of power. But it was horrible for the engines.
is this a problem with fists/modern cars? I have noticed that the car feels a lot stronger at part throttle in certain situations. i dont stare at the accessport while doing part throttle pulls but I don’t think I ever noticed the afrs go super lean when doing part throttle. But I could have missed it.
anyone know anything about this and whether it affects our cars? And if this doesn’t happen on our cars, why does the car feel way stronger at part throttle?
I have read explanations ranging from
- air velocity is really good for torque, while overall air mass and amount of air is better for high rpm’s. and by only giving it part throttle the throttle body doesn’t open as much, forcing the air to go thru a smaller opening increasing the velocity and efficiency of the engine at Lower rpms
(this explanation makes the most sense to me, there has been a lot of testing on intake manifolds and their design, and how longer and thinner runners are better for torque. And actually a lot of company’s use butterfly valves in their runners to help aid Low end torque. Further giving validity to this explanation, however if this explanation is true, why did part throttle super boost happen and why is it so dangerous to the engine? Manufacturers wouldn’t put butterfly flaps in knowing it would make the engine dangerously lean)
-it’s all in your head because you aren’t expecting the power as much during part throttle therefore you don’t tense your body in preparation (I don’t believe this because if you look it up there are posts on literally every forum about this, and part throttle super boost was at least at one point a real thing)
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