Built motor, injectors won't stay sealed?

[THEFERMANATOR]

That table should not be modified unless you change the sensor to a higher bar sensor. How does this make it run more pressure than it is written for? It should do that on LB7's as well if what you say is completely accurate.

It doesn't make it run more pressure, it allows the ECM to be able to read above the 180.0 MPA limit that the factory sensor is maxxed out at. The OEM tuning is set to top at 160, and the tables stop at 180 in the scaling. If your going to go beyond 180 you must rescale it so the ECM can recognize it when it goes beyond 180.

 

[bml2200]

The only time I had an injector problem with 80% over injectors was when the injector in question had 2 copper washers, which I never realized until the head was reworked.You can hear when you're losing compression, sounds like a typewriter and the fuel leakage is noticeable.

 

[S Phinney]

Make the changes I posted above and it will read above the 180 mark. I used to run up to 180 in my tunes, and found I had to rescale the rail pressure sensor. There is also a rail pressure error in the diag tables that can hold you back. C1807 and C1809 can limit you. I know my LB7 would stop at 167 no matter what I commanded until I raised these 2 tables up.

I haven't had a problem with lb7's not doing what was commanded.

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[S Phinney]

It doesn't make it run more pressure, it allows the ECM to be able to read above the 180.0 MPA limit that the factory sensor is maxxed out at. The OEM tuning is set to top at 160, and the tables stop at 180 in the scaling. If your going to go beyond 180 you must rescale it so the ECM can recognize it when it goes beyond 180.

So the pressure sensor can read past the 180 rating but is not accurate in doing so? When I was looking into changing rail pressure sensors the sources where telling me the limits were definitive. Maybe didn't want to tell me the whole story I don't know. Will the log read past the 180 as well or us it just going to allow the ECM to see more information or fool it into keeping pressures more into commanded parameters? If you would just call me as well to discuss it more.
Thanks Shane 850/545-1404

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[x MadMAX DIESEL]

Yeah I'm confused by that too. I want to get a 35000 psi sensor. But as of now the lbz will read 29007 psi, or 190 mpa. Can you rescale it some how is it might not be as precise but allow it to read past 30k with the stock sensor??

 

[THEFERMANATOR]

I know Mcrat had a thread here somewhere where he put a sensor in capable of reading 250MPA, then rescaled it to work. On a stock LLY or LB7, the logs will top out at 180 even if you command higher unless you rescale the sensor to keep reading higher. Table B0203 defines what pressure reading the ECM will see at the sensors voltage output. Since GM capped the rail at 160, they stopped the sensor scaling at 180. You can continue it out to 202, but since the sensor wasn't designed to really read past 180 it won't be that accurate past it.

 

[x MadMAX DIESEL]

I think Motorsport diesel sells the different bar sensors. They are about 400-600 bucks Iirc.