Walbro 525 Heavy Duty Relay install question

[lynmup]

My Armageddon 465 LPH pump failed for the 2nd time and worked great up until the second failure. I decided to install a Walbro 525 since I was out of warranty and it is running horribly as I found out it requires much more voltage to control than the factory voltage modulated FCM can provide.

Where can I tap a trigger source from to engage the relay that will still work with the auto start feature? Thought about utilizing pin 85 from the Fuel relay under the engine compartment fuse panel but not sure if it is a steady 12 volt. I origionally bough the multi relay from Nitrous Express but along with their tripple pump they said I could not use the input wire to the fuel pump as the modulated voltage would destroy the relay. Also, they canot make a tripple pump short enough to fit in the SUV tank so had to return both items and am going this route instead as there are not many options.

Cannot seem to find anyone who has done this and looked up fuel pump relay hot wire kits but no one seems to make them for the SUV's. Any help or previous experience very appreciated. I did purchase a Walbro 450 to swap out to put me back were I was as it doesn't require the current as the Walbro 525, however I'd rather get full use from the 525 if possible, also don't really want to remove the pump again. Either I drop the tank and swap the pump or drop the tank and wire the relay. I do have extra pins so I will install a full 10 gauge wire in the factory harness straight from the relay. Just need to know what triger source to use so I do not invoke any issues/errors or prevent the auto start from working.

[RDF1]

How was it wired before? What was triggering the relay?

[lynmup]

The Armageddon pump it's made to be a direct replacement, therefore I am using the factory wiring for the Walbro 525. I would like to put in a relay to get more voltage but like I said, I do not know what source to use as a trigger. I'm thinking pin 85 from the fuel pump relay, but I want to know if anyone else has ran into this exact situation before.

No need to reinvent the wheel!

[TrkNrrs]

I ran a 535 in 4 different setups in my 2016 gmc making all the way up to 760whp without issue on my stock wiring. You don?t need a relay bro, my brother is running one as well also without a relay in his 2016 Silverado

[lynmup]

No idea why but this one just isn't going much above my wastegate pressure. The 450 with the DSX was pushing near 20 psi but this one isn't even getting to 15 without going out of control.

Did you do anything specific in the tune to allow better control?

[lynmup]

Is it possible the pump I installed is faulty?

[TrkNrrs]

No idea why but this one just isn't going much above my wastegate pressure. The 450 with the DSX was pushing near 20 psi but this one isn't even getting to 15 without going out of control.

Did you do anything specific in the tune to allow better control?

Hold on? are you using this as an in tank pump or an auxiliary pump? I?m talking about an in tank pump not auxiliary.

[TrkNrrs]

No idea why but this one just isn't going much above my wastegate pressure. The 450 with the DSX was pushing near 20 psi but this one isn't even getting to 15 without going out of control.

Did you do anything specific in the tune to allow better control?

I?m really confused now.. wastegate?? 20psi?? What does that have to do with the fuel pump? Not being a smartass at all, you just lost me at wastegate and DSX.. lol

[lynmup]

Correct, I have the DSX aux pump that kicks in once it sees boost. This is the in tank pump I swapped out with the one Armageddon sells. They take a stock pump housing and put in a 465 lph pump "they say" and rivit the bucket back together so it fits in the stock location. When I pulled my pump out, this is what it had and as you see it did not favor well with the E85. I installed the 525 back int the pump housing but it does not hold up to the task as I am assuming that it requires much more voltage. Which is why I am asking about hooking up a relay and finding a proper trigger source for the relay. Since I cannot find a solution, I am droping the tank in the morning to swap out the Walbro 450 as it uses less current and should work just as good (if not better) as the old one that failed. The old one kept popping fueses as it was internally shorted. From all the external corrosion, I can understand why.

Hoping this thread will provide the solution to this delima in the event anyone attemps the same thing. Cannot find any answers online or youtube so thought I would ask our panel of experts here.

[lynmup]

I?m really confused now.. wastegate?? 20psi?? What does that have to do with the fuel pump? Not being a smartass at all, you just lost me at wastegate and DSX.. lol

I have 14 psi wastegate springs which the stock pump typically handles very well. With the DSX aux pump and the previous Armageddon in tank pump, I was able to push right at 20 psi but now can barely get full power with just the 14 psi wastegate springs.

[lynmup]

Heres a good comparison for you, when I installed the cheap Amazon chinese knock off, it was holding quite nicely @ 19psi but I decided to swap it out for the Made in USA version when I installed the Katech valve covers and remote mount plug wires, it dramastically changed the outcome.

I already addressed the rich condition in the 2nd log but you see it is still the same pulse width with 7 psi less. The 1st log was with 4 misfires so it was not performing as it normally does

1st is with the Amazon knockoff pump, 2nd is with the Walbro 525

[lynmup]

This is the last log I did while at the ICC 2024 roll race event in September. Going back and looking at the logs I can see the pressure was starting to drop on the top end. It dipped to mid 56 psi but went back up to right at 70 once it shifted into 4th. I had to let off as I was out of road during the race event. The 1st screen snip is the best I have ever seen it run before, then the pump died, Swapped out the pump with an amazon cheap pump and misfires occured. Upgraded to remote mount plug wires and installed authentic pump and has not been good since.

The 2nd snip is when the pump started to die. We were waiting for them to clear the track due to an accident so when I tried to start it again it woudln not crank. You can see the pressure starting to drop in this screen snip.

[lynmup]

During the roll race event I was dialing in the aux pump along with a few other adjustmetns and was able to increase the duty cycle 1 degree each pass. Was right at hitting the 20psi I was hoping for and this happens!

[lynmup]

... making all the way up to 760whp without issue on my stock wiring...

Was this crank HP? I was making 832 RWHP on a mustang Dyno (1,040 crank) in 3rd gear when I was hitting the fuel limit on my previous setup. Was told an aux fuel system would put me to 1,000 RWHP on the same dyno (1,250 crank). Have not been back but it is making more boost, using more meth (#16 to # 20 nozzle) and had to swap to a Brian Tooley long runner as mine developed a crack once I brought it back from the dyno.

In my case, so much more demand for fuel and controll for the fuel pump voltage.

[TriPinTaZ]

Just get a JMS voltage booster. Problem solved. No crazy wiring shenanigans.

[TrkNrrs]

Was this crank HP? I was making 832 RWHP on a mustang Dyno (1,040 crank) in 3rd gear when I was hitting the fuel limit on my previous setup. Was told an aux fuel system would put me to 1,000 RWHP on the same dyno (1,250 crank). Have not been back but it is making more boost, using more meth (#16 to # 20 nozzle) and had to swap to a Brian Tooley long runner as mine developed a crack once I brought it back from the dyno.

In my case, so much more demand for fuel and controll for the fuel pump voltage.

760 wheel horsepower. Not crank. But that was on e85 with meth on a borg s476 on 11psi (L83)

[TrkNrrs]

This is why I don?t go super crazy with power, it gets to the point where the shit isn?t even fun anymore. Spend more time fixing shit than driving it.

[lynmup]

Just get a JMS voltage booster. Problem solved. No crazy wiring shenanigans.

Aren't these controlled off of boost?

I'll look into the today... any specific method they are installed? Looking at one via summitracing and it's shows one that is controlled via the throttle position sensor. Any experience with this? Will everything else still function as it should,?

If this thing will work as advertised, I will need to swap to studs instead of the ARP Head bolts in currently running.

[lynmup]

This is why I don?t go super crazy with power, it gets to the point where the shit isn?t even fun anymore. Spend more time fixing shit than driving it.

Facts!

[lynmup]

760 wheel horsepower. Not crank. But that was on e85 with meth on a borg s476 on 11psi (L83)

Nice power on 11psi! I need to look up what you have... sounds pretty sweet.