with a 5% increase in air density would it be necessary to adjust the throttle position sensor voltage? An article on this website says 0.98V is optimum. Would this be the case for a half-shafted throttle body?
All performance increase tests taken at 1000 rpm, and the temperature was 71 degrees outside. As long as the temperature remains constant for the duration of the tests, the slight variations cancel themselves out. Calculating oxygen content; p=P / RxT Where p is the air density, P is pressure, R is the specific gas content, and T is the temperature in Kelvins. I have a degree in mechanical engineering and my neighbor who helped me with this has a PhD in applied physics so rest assured that when I posted a 5% improvement regarding the TB shaft mod, it wasn't just a guess. Also, we calculated the variance to be +- 1.3287%
If you want to leave the molecular science aspect out of determining the benefits from half shafting your TB, you can take the diameter of the throttle body to calculate the area for air flow, subtract the total width of the tb shaft and plate. This will give you the total surface area that the air has available to pass through to the intake manifold. After half-shafting the TB, do the same calculation again and you'll see that you increased the total area inside the TB for the air to flow by +- 5%. From a scientific standpoint, over complicating yourself by factoring humidity etc, is a waste of time and its just splitting hairs. Why? The second you pull out of your garage, the air temp, density, humidity etc is always fluctuating, which is why I went back and provided you with the variance (1.3287%).
Yea man, I wish I had picked up on theory a little more in school. An I wish I had a degree in mechanical egineering too!! Thanks for breaking it down though.
i just blew the clutch on my 95 gt and i figured since i was in that far that i might as well put a new flywheel in does the size of the fly wheel effect top or bottom end at all i am looking at a 157 tooth right now?
All performance increase tests taken at 1000 rpm, and the temperature was 71 degrees outside. As long as the temperature remains constant for the duration of the tests, the slight variations cancel themselves out. Calculating oxygen content; p=P / RxT Where p is the air density, P is pressure, R is the specific gas content, and T is the temperature in Kelvins. I have a degree in mechanical engineering and my neighbor who helped me with this has a PhD in applied physics so rest assured that when I posted a 5% improvement regarding the TB shaft mod, it wasn't just a guess. Also, we calculated the variance to be +- 1.3287%
If you want to leave the molecular science aspect out of determining the benefits from half shafting your TB, you can take the diameter of the throttle body to calculate the area for air flow, subtract the total width of the tb shaft and plate. This will give you the total surface area that the air has available to pass through to the intake manifold. After half-shafting the TB, do the same calculation again and you'll see that you increased the total area inside the TB for the air to flow by +- 5%. From a scientific standpoint, over complicating yourself by factoring humidity etc, is a waste of time and its just splitting hairs. Why? The second you pull out of your garage, the air temp, density, humidity etc is always fluctuating, which is why I went back and provided you with the variance (1.3287%).
I had that done to my 89 5.0 and every time i did a mod i would take it out to the track. I had a 76mm C&L MAF kit to a 70mm TB and egr plate w/ ported and polished Explorer manifolds on a bone stock long block. When i did this halfshaft mod i took it out to the track and i actually ran the same and my car was very consistant. I would never again risk getting bad idle or ruining my TB. I personally dont recomend this mod.
this looks like a whole lotta work for a whole lotta posible trouble
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1988 GT 5.0, MAC Fender Well CAI, MSD Ignition, Ron Davis radiator (Oh Yeah, the "Drooler"), Ford Racing 3.73 gears. Next up, rear disc brake conversion and front and back control arms, adjustable shock kit.
I had that done to my 89 5.0 and every time i did a mod i would take it out to the track. I had a 76mm C&L MAF kit to a 70mm TB and egr plate w/ ported and polished Explorer manifolds on a bone stock long block. When i did this halfshaft mod i took it out to the track and i actually ran the same and my car was very consistant. I would never again risk getting bad idle or ruining my TB. I personally dont recomend this mod.
I'm trying this free mod myself. I can't see why this along with some TB polishing wouldn't help. I picked up a TB for 20 bucks so, as long as I don't do something stupid, like not use Loc-Tite, I think it should all turn out alright.
Gerardo
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Looks like the previous owner went ahead and did this mod but he left about 1/8" of thread exposed on the inside portion.. I should grind the threads flush right?
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You can lead a fool to wisdom, but you can't make him think..
Throttle Position Sensor? 
