i see alot of throttle boddies for sale...what is the intent if i purchase a larger throttle body more airflow for more hp? pelase advise...thanks.....running b20b (jdm) p73 with phk pistons and LS intake mani with apexi n1 exhaust no headers

 

A larger diameter throttle body will in theory allow more air into the manifold. More air (with more fuel and a strong enough spark)= More power. Again thats the science behind it. Assuming you have an intake, unless you have an IM and a tune, adding solely a larger throttle body will create minimal gains and you run the potential of overheating the motor by running it lean.

 

The TB is the #1 part that determines the speed and volume of air entering the IM plenum. Having peak speed and volume efficiency occur at the correct RPM to work best with your engine package is very important in an all motor setup, which is why going too big on the TB is so fatal to HP production. Too large of a TB (and/or IM) supplies more flow volume than is needed, and at the same time flow speed is slowed down, you shoot yourself in the foot twice.

 

i see, so a bigger throttle body is basically not needed as a bolt on mod for a stock motor....you basically gain no hp...

 

HOW DOES running lean overheat the engine.. u mean the engine wil get to hot or it wil overheat as if there no coolant flowing thru..


lean means to much air not enough fuel.. how does that mean the engine hotter.

 

i agree how is that?

 

Are you asking me how does starving an engine of fuel heat it up?
When a motor burns lean it will heat the motor up.
Do you know anything about physics or thermal dynamics? When you have a flame and add oxygen it makes the flame hotter. Pretty simple. Thats like asking how does a cooler intake temperature make more horsepower?

To the OP, no you would not want to put on a throttle body in conjunction with other minor bolts such as i/h/e, it will not be beneficial.


Modified by MilanoRed_dc2 at 12:34 PM 8/17/2007

 

hey reiterate that for me.. so if u add flame with lots of oxgen it makes the flamer hotter. but less flames right? i don';t know.. how about when ur running rich.

 

When the engine is running lean, the ratio of oxygen and fuel (Air to Fuel Ratio) becomes less stoich and you burn less fuel with the same amount of air, increasing the amount of heat produced by the explosion of the pistons. When you add more air without compensating by adding fuel, the motor will heat up, causing the metal pistons and cylinder walls to expand. If they aren't made of the same material, one will heat or cool faster than the other and before you know it, you hang a piston in the cylinder wall and break a wrist pin.

Bottomline: Just like when welding, if you want the flame coming from the torch to become hotter, you increase the amount of air that feeds the flame.

 

what he said is true

 

ok , so if i swap a b20b and put a 99LS intake manifold on it, would that be neccessary for a bigger throttle body? due to the intake mani being smaler than the original?