[Blowby]

How many amps can these work with. Ran fine for many years until I took it out on a long trip. Started a 30 min climb at full boost, then poof and all the majic smoke escaped. So I thought the controller was old and ready to go anyway so I put another one on and it ran fine for a few days. Another long pull and ...toast. Do we need to run a relay?

[Rocket468]

You can't run a relay between the controller and the pump. There is something wrong somewhere with the app. The circuit designer tells me 10 amps. But i don't know what duty cycle. Our pumps pull 6-8 amps. Get me your email and i will send you off a warrenty app.

[Blowby]

Sent! Thanks.
BTW my F250 7.3 powerstroke turned an 11.93 ET using diesel only and washer fluid that weekend.

[agrazela]

Originally Posted by Rocket468

You can't run a relay between the controller and the pump.

Let me ask a follow-up question to this statement.

Are you saying that I cannot wire in a relay between the 12v out on the controller and the 12v in on the pump (i.e., on the pump power wire), say using pins 85 and 86 on a standard Bosch relay?

I am planning out a system now, and my hope was to trigger another event via relay when the controller sends full (or near to full) voltage to the pump.

Is the problem due to voltage surge in the relay coil? What if I used a voltage suppression diode on the relay, ala this:
Relays

Or is the issue the internal resistance of the relay coil? (Perhaps tricking the controller into believing there is a problem in the circuit)

Would it be any different if the relay was wired in after the pump (between the pump and ground)?

[Blowby]

Good question. I don't want to damage another controller. I'll wait for the response from DevilsOwn.

[agrazela]

Just to be clear, here is what I am trying to do:




I want to put a relay between the controller and the pump so that when the controller gets up to 8+ volts to the pump (minimum relay closing voltage), the relay trips and the audio-taper trimmer will function as an IAT spoof (for a few extra degrees of timing, as determined in my tune). When the controller powers down the pump (dropping to release voltage of about 1.5v), the relay will bypass the trimmer, giving me normal IAT function again.

I put a diode in there to try to suppress voltage surge from the relay coil.

(Note: I also wired the float switch into the power wire, thinking that if the float breaks the circuit due to low fluid, it would purposely trigger fault mode in the controller, purposely making the pump not run and the IAT spoof not be able to function...call that a "failsafe")

Anyone see any flaws or problems with setting up like this?

[dvldoc]

The relay should be on the controller red wire, Not on the output side. There is a voltage regulator in the controller that you will interfere with by putting something on the output side. There is also a voltage sensor that sense under and over current that could be effected by the relay switching. It would probably set the fault light.

But yes for heavy use run a Relay on the controller.

[agrazela]

Well, I guess that kills my IAT spoof idea

[Blowby]

My email was messing up today, so could you resend the warranty stuff. Thanks!

[Blowby]

Did you get my PM with email address? I'll send it again.