ok well im in the process of building a motor and am curious to know how would one estimate the "perfect" throttle body size for any motor.

specs
-b16a3 block
-b17a1 crank/rods
-.25 over p73 pistons
-blox intake mani thats been p&p'd
-62mm itr throttle right now
-rc 310's
-prolly mill/deck the block/head .020

the compression should be around a low-mid 11. i want a motor that works well together and my focus will be on the suspension.

 

What cams? If its gonna remain a mild NA build, keep the ITR TB

 

yup itll be n/a. the head will be a 99 up itr head, stock valvetrain maybe p&p it a little more.

 

What's on the menu for the exhaust system?

 

some sort of custom 2.5 w/ mandrel bends, no cat.

 

Sweet, how about header?

 

"perfect"? youll have to check on a dyno i guess.
From some 240 forum (use info at your own risk)
http://www.240sxforums.com/forums/ka...ade-guide.html

"Determining TB Size:
The best way to find out if your TB is too small for your IM plenum is to determine what the intake manifold absolute pressure (MAP) sensor is reading (in the plenum) when you are at full throttle ( or wide open throttle (WOT) ) while the car is accelerating using a datalogger. The MAP should be equal to, or close to, atmospheric pressure. If it isn't or there is a MAP drop at WOT, then your TB is still too small."

 

makes sense.