Two throttle body spacers.?? More affective than one.?
11-24-2013, 04:14 PM
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Two throttle body spacers.?? More affective than one.?
Has anybody put two throttle body spacers on.? I got sent two by accident so i wanted to see if its been done.
11-24-2013, 07:11 PM
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11-25-2013, 09:03 PM
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EvilVirus (11-26-2013)
11-27-2013, 08:40 AM
#21
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^ Pretty much 
I'm just not convinced that spacers have anything more than a negligible effect or possibly even a negative effect by shifting the powerband (again, in an uber-negligible way) toward the lower RPM's. Cocoa summed up the physics in his post:
I don't understand why you would want to create more wheel spin in the lower rpms than you can already handle. I've always been against this mod since day one. (not referring to p2r directly, but the thought of having longer runners)
The following is not my wording, but I'm just going to copy and paste something for yall to get a lil more informed as to how this mod works.
" It has to do with the mass and velocity of airflow in the runners. Every engine parameter has an RPM where it works best which is why its important to match them together. As RPMs increase, the velocity of airflow will increase in the runners. Once it reaches a certain velocity (actually around 300 mph) it will start becoming restrictive. So, as the velocity increases, the more inertia it carries with it. Once the piston reaches the bottom, the column of air will use its inertia to cram a little more air in there before the valve closes.
A long skinny runner will hit that peak velocity early in the powerband and use its inertia to cram extra air in the cylinder down low in the RPMs where torque is favored. Above those RPMs it starts choking off flow and restricting high RPM power. A big short runner will reach that peak velocity later in the RPM band, meaning you have to rev the engine higher to get it to get any inertia behind the column of air. This also means that short runners can actually remove some low end torque from the combo because there is very little velocity in the incoming air.
There are other factors involved but they're mild. When the intake valve closes, it sends a pressure wave back up the intake tract much like when you slap your hand over a tube. If you tune things carefully, that sound wave will be headed back to the intake valve at the same time its ready to re-open. Long intake runners (like Tubas) develop those harmonics lower in the RPM range. Short intake runners (like flutes) develop those harmonics higher in the RPM range."
Hope this helps
I'm just not convinced that spacers have anything more than a negligible effect or possibly even a negative effect by shifting the powerband (again, in an uber-negligible way) toward the lower RPM's. Cocoa summed up the physics in his post: I don't understand why you would want to create more wheel spin in the lower rpms than you can already handle. I've always been against this mod since day one. (not referring to p2r directly, but the thought of having longer runners)
The following is not my wording, but I'm just going to copy and paste something for yall to get a lil more informed as to how this mod works.
" It has to do with the mass and velocity of airflow in the runners. Every engine parameter has an RPM where it works best which is why its important to match them together. As RPMs increase, the velocity of airflow will increase in the runners. Once it reaches a certain velocity (actually around 300 mph) it will start becoming restrictive. So, as the velocity increases, the more inertia it carries with it. Once the piston reaches the bottom, the column of air will use its inertia to cram a little more air in there before the valve closes.
A long skinny runner will hit that peak velocity early in the powerband and use its inertia to cram extra air in the cylinder down low in the RPMs where torque is favored. Above those RPMs it starts choking off flow and restricting high RPM power. A big short runner will reach that peak velocity later in the RPM band, meaning you have to rev the engine higher to get it to get any inertia behind the column of air. This also means that short runners can actually remove some low end torque from the combo because there is very little velocity in the incoming air.
There are other factors involved but they're mild. When the intake valve closes, it sends a pressure wave back up the intake tract much like when you slap your hand over a tube. If you tune things carefully, that sound wave will be headed back to the intake valve at the same time its ready to re-open. Long intake runners (like Tubas) develop those harmonics lower in the RPM range. Short intake runners (like flutes) develop those harmonics higher in the RPM range."
Hope this helps
11-27-2013, 02:18 PM
#22
Suzuka Master
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Well, most people tend to hate throwing away $100 on something that does nothing.
Huh?
That whole paragraph is about intake runner length and how the length of the runners affects the powerband. It's all what's happening after the throttle body. It has nothing to do with the length of the CAI which is what is affected by the throttle body spacer.
That whole paragraph is about intake runner length and how the length of the runners affects the powerband. It's all what's happening after the throttle body. It has nothing to do with the length of the CAI which is what is affected by the throttle body spacer.
11-27-2013, 03:21 PM
#23
Drifting
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Well, don't I feel sheepish. 
For some reason I was thinking of the IM spacer. Eh, both are quite worthless IMO. I've tried both. Neither helped reduce IAT's or provided any noticeable power increase.
For some reason I was thinking of the IM spacer. Eh, both are quite worthless IMO. I've tried both. Neither helped reduce IAT's or provided any noticeable power increase.
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