I know the port matters alot, Im just asking cause I read the last RXTuner and some red 3 rotor was doing 400wrhp no 10psi on the stock twins, if this is true, how much could one expect at 15 or 14 psi?

 

The stock twins will not hold 15psi. I have a Large street port and I hit 15psi at 3500 and by 5500 i'm at about 10-11psi, 6000+ is 8-9psi. I am going to put the car on the dyno before I install the GT80R. I want to see if the AEM's hp calc even close. It usually shows about 440-455 RWHP with the AVCR at max duity cycle. That is probably why i've burnt up 2 sets of stock twins over the past 2 years

 

The stock twins wont tolerate any more than 1-bar (14.7psi) hence why I run mine at 0.9-bar for reliability. Almost all Japanese tuners will do the same & only the foolish push over 1-bar.

I know a guy that was stupid enough to push 1.2-bar & the turbos died within a few weeks of street use.

A well known Japanese tuning shop has told me that the turbo's are the weak link for making power. At 1-bar, with free flowing exhaust, intake, intercooler & a chipped factory ECU the engine is good for 335kW (unsure what that is in 19th century horsepower)

The standard porting will flow better than the turbo's will so dont bother porting if you are going to use them.

REgards