When half-shafting your throttle body, what your doing is removing the front half of the throttle blade shaft. With the throttle wide open, carefully grind the threaded ends off the throttle plate screws (since they are "staked" to keep them in place), and remove the butterfly plate. Look CAREFULLY at the throttleshaft, as you are going to cut the drilled side off, leaving just the threaded half of the shaft (know as "half-shafting"). Once you are absolutely positive which side is to be removed, use a coping saw or cutoff wheel to remove that half of the throttle shaft. Carefully grind the remaining nubs flush. This simple mod will increase the air through your stock TB at least 5%. For even more airflow, thin the front (stamped) side of the throttle plate as much as possible, and taper it to the ends (from the shaft, straight out). Do not get too close to the edge or you will have idle speed problems! Countersink the bolt holes (again, not all the way through!) and use M4-.7x8mm oval head machine screws to secure it. To reassemble, center the shaft and tighten ONE screw. Treat the other screw with 3m Loctite 271 "Red" for a permanent mount. After it has set (5 minutes or more), remove the remaining screw and Loctite it as well. After they have completely cured (24 hours), grind any exposed threads flush with the throttleshaft. Cheap and easy! I attached pictures so you can see what I'm talking about.
That's a great write up. I'd like to highlight the part about not getting too close to the edge of the plate, that would definately cause idle problems, it'd also cause an off idle stumble. Great work.
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eagle, remember i was telling you about my car idling weird sometimes? well maybe its because my TB was half shafted. i looked at it for shits and giggles but i was like ok its already done.... maybe thats why i have odd idle problem's sometimes?
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Racing on a budget a real budget
stock gears, stock intake, stock heads.
street tires 245/50/16 at 28 psi
14.1 at 100.43 with a 2.335 60ft on motor
13.9 at 103.36 with a 2.385 60ft on 50 wet shot
only 650 psi and it was practically out of juice
all on a broken off upper control arm
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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 wasn't doubting you, i just wanted to see what the new throttle shaft looks like wide open. no pics?
lxarlo my man, that wasn't in response for the WOT picture requests!! I just decided to do an actual test after I posted the instructions so I could backup my statement of a 5% increase in performance. Sorry if it seemed like I posted that in response, that my bad!!! I figured that anyone deciding if they wanted to half-shaft or not should have some mathematical and scientific performance gain data to help them out.
i have a slight idle problem and my TB isn't half shafted. a friend of mine told me to drill a hole in my butterfly plate will that work
You don't need to drill a hole into the throttle plate, all you have to do is adjust the idle screw on your throttle body to stabilize the engine idle.
its a power performance TB and it said in the directions not to mess with that screw. if it wont screw anything up will it.
Out of the box you shouldn't have to adjust the TB idle screw, but since you've got some idling issues it's the first thing you should try. It's completely safe to adjust your idle screw, just take your time and make small adjustments to see if you can smooth out your engine.
If you call LRS or summit thay will help you with that,considering the fact that you have a performance cam,it does not help.What you should try is idle ajust plate witch goes between the upper plenium and the idle air control valve.I'M pretty shure it will work.the screw i think will probably give you more problems because the idle is computer controled,buy screwing in the ajustment it could possibly work ,but in the other hand it may not ,the computer will sens the tps open and it will close your iac motor so your back wher you started.Try that plate you wont regret it.Is your maf calibrated to your injectors,nick
Half-shafting your throttle body. Here's how! 
