Nishihara

Im running a 1.5 jz swap with my stock ge block with a 1jz head and wanted to make more on the dyno how much boost can I run? I have a 255 fuel pump and 440 injectors. Apr head studs with a safc. I'm at 13psi now. Any info would help a lot thanks.

spoolxexo

iTrader: (4)

You are in Cali, which means you only have 91 octane at the pump.

This limits you quite a bit.

The boost you "Can" make is relative to:

-Static compression ratio of the engine

-Total timing at WOT

-Fuel setup

-How much boost the turbo(s) can physically make.

You didn't mention what turbo setup you are running!

In your case you are capped at:

-Fuel system is good for around 420HP to the wheels

-You can make around 16-18 degrees timing safely on 91 octane

-The Stock ECU has a boost cut function, so either way you can only get to 18 psi before it cuts fuel off.

99SC42

iTrader: (44)

^^^You beat me to it.

edited

spoolxexo

iTrader: (4)

Sorry bud, I get all excited when tuning talk is going on!

99SC42

iTrader: (44)

No problem haha!

Nishihara

Nice. Thanks guys that's what I wanted to hear I'm running stock ct12's and 18 psi is the max I wanted to run lol.

Nishihara

You guys think I made good power I hit 307hp and 325tq on stock boost well 13psi because of my down pipe I guess.

INTIMAZY

iTrader: (5)

Sounds right on target. You are on the verge of boost cut anyway unless you have a way to defeat it.

With my downpipe, I would regularly hit boost cut in high gears if it was less than ~60 degrees outside. The slightest airflow mods could put you over the edge so you will need to find a way around boost cut.

Not sure how much more headroom you gave yourself with 440's

Biggu

iTrader: (12)

my 1jz running AEM ems, stock downpipe and cat back ehxaust made 398/379 TQ at 17psi.