Originally Posted by FrostByte
Should be a sticky, EVERY WHERE.
What u recommend for me as far as throttle body/intake for my setup. I think improvement here would put me @ limit for my internals (425ish+ rwhp).
With stock internals I would not push it that hard and instead keep it down around 400 rwHP. Even that will negatively affect engine life--if you actually use it regularly. I once asked a close friend, who was an engineer for a couple of the "big name" tuner manufacturers for nearly 20 years, before starting his own company, "What is the practical limit for stock PI internals?
". With absolutely no hesitation he said "425 HP, you can set your watch by it.
The sintered metal connecting rods are the weak link. But look at it this way, when Ford built the 2003 and 2004 390 fwHP (331 rwHP) Cobra's they changed to a forged rotating assembly--this was not just so they could spend more money, it was because they felt the 2V internals were not up top the task.
As to your TB and plenum needs, any 75 mm TB and aftermarket plenum will pass enough air for the needs of any build with a stock bottom end. Oddly, and somewhat counter-intuitively, the TB and plenum become less of a factor with forced induction. This is because as soon as the boost comes up the intake tract becomes just a large pressure vessel shoving air into the engine--the engine is no longer trying to suck in pulses of air as with running n/a, where intake size and tuning (on both sides of the TB) are prime factors.
A whole different ball game. It's sort of like connecting a 10-foot 3/4" ID hose with no nozzle to a domestic sillcock and measuring the water flow rate. And then switching to a 10-foot 1" OD hose (78% larger). The flow rate will not change by 78%, if at all, because the 3/4" hose was as big as was needed.
On an n/a setup the intake air pulses can stack up, bang into one another and create standing wave harmonics that can actually "suck out" power at certain frequencies (engine rpms). The n/a intake, especially before the TB, is not "just a pipe" as many like to put forth...