[radz28]

From what I've seen, there's at least one person here, whom I always refer to, that has experienced auto-X/track issues with a tank-tapped-aux' pump. He had a DSX aux' and fuel would slosh away from the pick-up, and pressure would drop. That would happen at less than a 1/2-tank or something... Travis Lambert is his name. He has a great thread about his build and troubles.

It seems to me that if you do more than just highway digs/pulls, and it has any corners, you need something with an OEM-style bucket (or some sort of elaborate low-side with a surge tank). FORE is bad-@$$-top-notch, but I'm not sure, without some sort of surge tank or something like that, that it will keep good pressure on anything less than a half tank of fuel while going around the course/track. I think DW, Katech, and DSX all make buckets (drop-ins) with upgraded pumps (and mostly drop-in). It sounds like DSX's bucket has the highest potential, and, of course, it's the most expensive, but that dude doesn't mess around. It's pretty much full billet and everything you'd probably expect for $2K. I know I hate all the loose OEM-type flex tubes dangling everywhere on the others, getting caught-up on all sorts of mess during the install, so the DSX is pretty nice, IMHO. Worth $500?... I don't know...

Unless you go full custom, I'd suggest thinking about those drop-ins for what you're talking about. I've had direct experience with the Katech, and have had (and removed) the DSX aux' pump (and am probably going to sell it - feel free to let me know - less than a year's use, and less than 1000-miles on it), but have no horse in the race. I feel better with what I have now, despite some self-inflicted (most likely) issues. I like the Katech for a direct drop-in and pretty easy tuning (so far). I don't plan on more power than where I'm at now, and this bucket leaves plenty of headroom.

JMHO...

[KingLT1]

Originally Posted by towerfab

Carb not a concern however i would like to be able to auto cross/track the car and have heard of guys having issues with the Fore setup. Uograding the auxillary pump would be a much easier route if that would work. Do you know anyone who has gone that route? Would there be anything gained from using a different in tank pump in conjunction with the larger aux? Im currently running an lt4 in tank pump.

Aux setups will cavitate on road course unless you keep them above 1/2 tank. My brothers Z06 makes north of 1000whp with LT4/JMS and DSX Aux with upgraded pump. Low side holds fine on E60. Haven't tried more because the LPE high side pump is maxed.

The Katech dual drop in pump would be the solution for road course if you want to be able to run below 1/2 tank safely, but we don't know the actual limits of what it will support. Manufacturer claims 900whp on E85 but haven't seen it firsthand.