larger throttle body

[john kinch]

any ideas beside 300 dollar custom billet ones

 

[RonD]

First test if you need one

There is no emissions reason or "logical" reason for a car maker to restrict air flow into an engine
What size engine do you have?

A 2.3 LITER engine can pull in 2.3 liters of air at Wide Open Throttle(WOT) every 2 RPM, at anything less than WOT then it would pull in less air

Get a vacuum gauge and longer vacuum hose so you can put vacuum gauge in the cab so you can see it easily when driving..........at higher speeds

Assuming location elevation is between sea level and 2,000ft
18" to 21" and steady at idle means engine is in good running condition, unsteady/fluctuations means its not

Open and release throttle quickly, should see the drop to 0 and then quick return to 20-25, slow drop and slow return means exhaust is partially clogged

Get up to 60MPH and cruise, should see steady vacuum, if its fluctuating then you have valve issues

Then floor it, WOT, vacuum should drop to 0 breifly then go to between 1 and 2, but under 3", if vacuum does not drop under 3" with full load then yes, you have an air restriction

At full load as RPMs get higher vacuum will drop to 0, this is called "Floating the valves" as both intake and exhaust valves are both open at the same time because springs and cam timing, so loss of power

So you want higher RPMs and full load to see if vacuum of 2" can be seen before floating the valves

 

[scotts90ranger]

Do you have any other modifications to the engine? At best a bigger throttle might get you 1% power on the top end and make the throttle more touchy on the bottom end...

 

[sgtsandman]

A bigger throttle body can actually reduce performance if done wrong. Just like with the exhaust if nothing is done with the engine to take advantage of it

 

[O No 3.0!]

Start with a k&n filter. Open your airbox up by taking out the silencer & making the hole larger. Next, port & polish your mass air meter. After that, then you can replace the t-body. There are several factory t-bodys you can upgrade to, depending on what engine you have.