Rb25det - Powerfc Issues

[BrownDog185]

Hey guys

A mate just bought a 32 with a RB25 from a 33 running on a PowerFC. it runs and drives but has a few little issues they we need some help with.

When starting cold or hot it takes 2-3 turns of the key for it to actually start, 1st time u could crank forever and it won't start, 2nd crank it will stumble after a while, 3rd it starts up just fine

Sometimes when it's hot and restarted a few mins later it will start first go

It runs rich as f***, huge black clouds before boost and as u let off, also has huge orange fireballs as u let off from full throttle

Has very bad fuel economy

Has Z32 AFM and been told aftermarket injectors (can I get info on standard injectors so I can double check)

Input and help is greatly appreciated

Dont really wanna pay for a full retune if it's something simple

[GTSBoy]

Pay for a full retune. We can't internet diagnose this sort of stuff.

[BrownDog185]

Atm plan is to try a standard 25det ECU and see what happens

Anyone on brissie Northside wanna lend us an ECU for 5 mins??

[Ben C34]

Plan is bad.

A stock ecu and bigger injectors and or z32 don't mix

[GTSBoy]

You cannot hope to make a standard ECU run with a Z32 and bigger injectors. The only way it could possibly work is if the relative change from stock on both the AFM and the injectors was exactly the same. Chances of that are pretty bloody small.

Best option is to take it to someone who can do the obvious stuff, like measure the fuel pressure when it's on load, put a HC or laptop on it and see WTF is going on when it is trying to run and trying to start. Which means a trip to a tuner, with minimum cost being a little time and maximum cost being a full retune + repairs if something is stuffed.

[BrownDog185]

Ahh ok then

Any pics of standard injectors, any google search comes up with different results

We have the HC for it now

Inj-duty is about 1.6/7 when cranking

[GTSBoy]

Stock are purple. Bigger (from S15) are reddish/brown. Yellow and bright red are bigger Nismos and possibly some others like Sard or whatever. 550s, 700, that sort of stuff.

[-S-]

Is it possible to check via injector latency? Like example Nismo 555 is usually set at 66% . That sort of stuff that's on the Internet. I'm just having a wild guess BTW .