Evo X upgrades

[Murlo26]

Very generous Dave, thanks. I'm waiting to hear if Shane has a GSS342 on hand. If not then I'll make a couple calls. They are common enough.

Not like I am going to be using mine anytime soon, lol. Not a problem, the car is already up there too :)

If the pump didn't work and the fuel assembly was the culprit i would say it would be worth a try to swap in my setup quick for testing...maybe not quick but before you spend another 500 on another double pump setup.

[mlomker]

Ended up buying a pump at RS on Tues night and ran out to DB and installed it tonight.

Beautiful weather and it was fun to work on the car again. Nothing is ever that easy for me so I'm not really expecting that to fix anything.

Danny found the missing key fob. It had somehow lodged itself underneath the amp that is under the driver's seat. He's a good guy.

[Murlo26]

So they putting it back on the dyno soon?

I figured it was under the seat somewhere.

[mlomker]

I figured it was under the seat somewhere.

He zip-tied it to a lanyard this time. lol.

[turbotalon1g]

Good stuff. so back to the dyno?

[FullBlown]

Just curious as to why you have it set up to do progressive fueling. We have sold a ton of these kits and the best way is to activate the second pump at a low boost pressure (3-5psi). Another way is just to have them stay on all the time. Im not sure how blaqops is progressively controlling the pumps but that would put more stress on the pump if it had to ramp up and down all the time. Plus it just adds more to the equation for failure. I,m guessing he is using some sort of voltage regulator to do so, but that's just my guess.

[mlomker]

I'm guessing he is using some sort of voltage regulator to do so, but that's just my guess.

He has a controller box that runs off of boost. It controls a special 270lph Walbro that is designed to run progressive. Normally it'd turn on at 5psi or so and then it'll progressively ramp up to a cut-off psi, normally 15 (they are adjustable). They also do a simpler Hobbs kit with two GSS342's in it, which is what you mentioned.

I don't know what I'll try next if it wasn't the primary pump. Try to find a stock FPR to borrow from someone and swap it in, I suppose. After that I have to consider pulling your hanger and having BlaqOPs do their normal setup in a stock hanger. They said they'd help me with that for free and I've already got too much money into this fueling setup. <sigh>

[Shane@DBPerformance]

Just curious as to why you have it set up to do progressive fueling. We have sold a ton of these kits and the best way is to activate the second pump at a low boost pressure (3-5psi). Another way is just to have them stay on all the time. Im not sure how blaqops is progressively controlling the pumps but that would put more stress on the pump if it had to ramp up and down all the time. Plus it just adds more to the equation for failure. I,m guessing he is using some sort of voltage regulator to do so, but that's just my guess.

It seems like a lot of the fuel from the main pump is getting pushed back into the tank when the other pump isn't on. It won't support any amount of HP when the other pump isn't on. You have to have the secondary pump come on immediately to get it to transition into boost without going lean and misfiring. I am not sure what the advantage of the progressive setup would be, just seems to add more possible problems. With your Fullblown setups on the 8/9s we were always fine having the second pump come on at even higher boost levels like 15-20+ PSI and it still be able to support good power on 1 pump and be a totally seemless transition when switching the second pump on at those kind of boost levels. With a lot of the bigger power setup we run both pumps all the time, just need a decent FPR that can handle it at idle/part throttle. I just did a Supra that runs 2 pumps all the time and the third pump comes on at 27psi.

[mlomker]

With your Fullblown setups on the 8/9s we were always fine having the second pump come on at even higher boost levels like 15-20+ PSI

In that case the assumption is that the progressive pump back-flows more than a second GSS342 would. Whether progressive or Hobbs, the second pump would not be running under vacuum.

Converting my setup to a Hobbs switch would just require swapping the other 342 in as the second pump and obtaining a Hobbs switch. All the wiring is already there in the glovebox for hooking it up.

I'll be waiting to hear from you before I try something else. I could disable the second pump and try running it as a single pump. That would isolate the rest of the fuel system setup.

[scheides]

In that case the assumption is that the progressive pump back-flows more than a second GSS342 would. Whether progressive or Hobbs, the second pump would not be running under vacuum.

Converting my setup to a Hobbs switch would just require swapping the other 342 in as the second pump and obtaining a Hobbs switch. All the wiring is already there in the glovebox for hooking it up.

I'll be waiting to hear from you before I try something else. I could plug the hole/disable the second pump and try it on one. If it misbehaves on a single pump then it'd prove/disprove the backflow theory.

I say get a hobbs switch and try it that way, and if it still causes problems then plug the second opening and revert to single pump. Gah what a PITA, I feel for you guys :(