Evo X upgrades

[Shane@DBPerformance]

Originally Posted by 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.

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]

Originally Posted by ecoli

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]

Originally Posted by mlomker

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

[mlomker]

Originally Posted by scheides

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.

I'm wishing that I'd just gone Hobbs from the start. I didn't know that FB sold the Hobbs switches and whatnot until after paying BlaqOPs for their progressive setup. They advertised that as better than their Hobbs setup and I'm a sucker for gadgets, what can I say?

Dave has the same BlaqOPs pumps but in a stock fuel pump housing and with an afpr setup from MAP. The wrench that I threw into this was the FB hanger and I still have the stock fpr. The only thing about the FB hanger that weirds me out is the suction line setup, other than that it's just a couple holes for pushing gas so what could go wrong? lol.

I had the pump housing out and took it all apart last night to replace the primary pump, so the hoses are all good. I guess I could verify the hard-line connections underneath the car.