Hey Guys,

maybe you have some more ideas, cause i dont really know what else i could do:

In December i installed my Stage 2 Turbos (TTE) in my car- since then we are tuning it. First Map was a pleasure, car pulled like a train- but after logging we saw that the rail pressure is diving hard.
I thought okay HPFP is still the first one and boost is a little bit too much for the stock fuel system.

I changed the HPFP to a new one and logged again last week (after we made some progress with boost curve etc). But again: Rail is dropping, especially in the lower gears. And the Trims are so far away from each other...

Also i see my LPFP dropping in lower gears to under 60, sometimes under 50.. I have a Walbro 450 installed in stock bucket from a guy who does it very often here in germany. I will have a look if all hoses in the bucket are ok, but i think so.

I know that pressure on the lpfp is not everything, but the target is like 72PSI so i think the HPFP needs the fuel pressurized to 72PSI to work on spot?

After looking at my Walbro again my next idea would be changing the injectors.

Logs:
http://datazap.me/u/raffi/v8-0?log=1&data=3-24-25-26

See the big difference in trims + dropping of HPFP in higher RPM. With more boost the AFR already began to raise over target.


Any idea is appreciated!