[towerfab]

Originally Posted by James Montigny

The DSX low side was enough for me at 640, but it couldn't keep up at 850+

I ended up going with a dual in-tank from Aeromotive (similar to the Fore setup).
I would so something like that if your goals are to reach 946 (with out without meth)

I'm guessing you had the smaller dsx aux pump and no boost on the lt4 in tank. The low side didn't have any issues keeping up on the dyno at 946. The problem with the high side fluctuation occurs randomly and there is no drop on the low side. The high side drop occurs at very moderate power demands, no boost, cruising with steady throttle position. Makes me think it isn't a low side issue at all but I'm not good enough with this to figure it out, hence the post asking for help. There's some ultra experienced guys on here for sure.

[towerfab]

Originally Posted by jlaudio11

How much did you look into the dsx port before adding it? There are issues with rail pressure dropping but supposedly not enough to cause the issue youre having. It has to do with the direct injection, injection window and start of injection. There are basically articles about it in the tech section on dsx's website and videos on their youtube.

The problems I'm seeing are happening long before the port is involved. Low power, no boost, steady throttle driving. Very random.