engine swap q's, yes...i read the sticky Options

[97celiman]

i was reading the 4age and 4agze posts and it says the 4age is used more for racing applications and the 4agze more for street driving...my question is why? do race teams turbo the 4age? or do they just beef up the internals so much that it produces insane amounts of power while staying NA. im just curious more than anything...not planning on swapping (i have a gt-but mostly funds)
thanks

[mspired13]

The 4AGE is a small displacement motor, try as you may, it is very hard to make a lot of torque with asmall motor. 4AGEs were meant to rev, and rev they do. Almost all their power and peak torque comes in at a very high RPM. Something 5SFE cannot do. What is different between the 4AGE and 4AGZE is the addition of a supercharger. A Roots type Supercharger to be exact. This unit helps the little motor make a good amount of torque in th elow end, which is why it is a better choice for daily driving. Either way, these motors are pretty strong. the 4AGZE's supercharger is usually taken off by many race teams and a turbo slapped on, because the internals are stronger then a regular 4AGE. The TRD Atlantic motor is an NA version of the 4AGE, and is rumored to produce 210+BHP from 1.6L without variable valve timing.