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BostonR56S · 01-03-2012, 12:22 PM

Jeff, I experience this sound on shutdown too, sometimes. But lately I haven't been hearing it. However, now hearing that its the pump activating for a split second, maybe this is why I had the pooling in the FMIC outlet. The checkvalve has stopped and bubbles forming in the hose upon sitting for a few hours, and the fmic is only oil now, so the checkvalve worked regardless.

(01-03-2012 12:08 PM)Howerton Engineering Wrote: etalj was discussing this with me as he stated his was doing the same. This happens when the two power sources power down at different times. Basically, the fuel injector power is on a second longer than the fuse power.

The red wire of the gray connector is what arms the entire system, if it goes off first, or at the same time as the red control power all is fine. If the red wire of the gray connector is on longer than the molex power, then the systems master relay is held on while the power/ground reference of the molex is lost. This is triggering the pump relay for a split second.

The long and short is, we may need to find a different fuse to pull power from. etalj was pulling power from the cigarette lighter, and while not the best power source for the system, didn't have this power issue. I don't remember Sil88 car doing this( my memory could be wrong) when we installed it so I can't tell what maybe different on the other installs.

We will try to get this sorted as soon as we can get some feedback.

**Howerton Engineering** · 01-03-2012, 12:31 PM

(01-03-2012 12:22 PM)BostonR56S Wrote: Jeff, I experience this sound on shutdown too, sometimes. But lately I haven't been hearing it. However, now hearing that its the pump activating for a split second, maybe this is why I had the pooling in the FMIC outlet. The checkvalve has stopped and bubbles forming in the hose upon sitting for a few hours, and the fmic is only oil now, so the checkvalve worked regardless.

(01-03-2012 12:08 PM)Howerton Engineering Wrote: etalj was discussing this with me as he stated his was doing the same. This happens when the two power sources power down at different times. Basically, the fuel injector power is on a second longer than the fuse power.

The red wire of the gray connector is what arms the entire system, if it goes off first, or at the same time as the red control power all is fine. If the red wire of the gray connector is on longer than the molex power, then the systems master relay is held on while the power/ground reference of the molex is lost. This is triggering the pump relay for a split second.

The long and short is, we may need to find a different fuse to pull power from. etalj was pulling power from the cigarette lighter, and while not the best power source for the system, didn't have this power issue. I don't remember Sil88 car doing this( my memory could be wrong) when we installed it so I can't tell what maybe different on the other installs.

We will try to get this sorted as soon as we can get some feedback.

It sounds like the pump is pulsing for a second, but the CV won't stop the fluid if the valve was pulsing at the same time. It would blow right past it.

So it appears it's just the pump jogging and the valve is staying shut.

silhouette88 · 01-03-2012, 12:48 PM

(01-03-2012 12:08 PM)Howerton Engineering Wrote: I don't remember Sil88 car doing this( my memory could be wrong) when we installed it so I can't tell what maybe different on the other installs.

We will try to get this sorted as soon as we can get some feedback.

Wow, I kind of feel like an idiot now. This has been happening to me since the install but I always thought it was normal. Sorry for not mentioning it. FWIW, the "stumbling" has been happening a lot less. I did increase my meth concentration to 100% for a few tanks but then went back to ~75% recently. I think that when I was running 100% the stumbling went away, and only recently did I feel it happen again. I'm going to start keeping better logs of these changes and symptoms. That will be one of my resolutions. Smile

ThumperGP · 01-03-2012, 12:50 PM

Mine made the shut down noise, everytime. I thought it was normal?

I was pulling power from the OBD fuse...

**Howerton Engineering** · 01-03-2012, 12:51 PM

(01-03-2012 12:48 PM)silhouette88 Wrote:
(01-03-2012 12:08 PM)Howerton Engineering Wrote: I don't remember Sil88 car doing this( my memory could be wrong) when we installed it so I can't tell what maybe different on the other installs.

We will try to get this sorted as soon as we can get some feedback.
Wow, I kind of feel like an idiot now. This has been happening to me since the install but I always thought it was normal. Sorry for not mentioning it. FWIW, the "stumbling" has been happening a lot less. I did increase my meth concentration to 100% for a few tanks but then went back to ~75% recently. I think that when I was running 100% the stumbling went away, and only recently did I feel it happen again. I'm going to start keeping better logs of these changes and symptoms. That will be one of my resolutions.

We can try extending that wire to the ECU and see if it stops. I don't remember it while you were here, but I was a little more concerned with the damn IC tubing.

Penis · 01-03-2012, 01:22 PM

The ECU stays active for 5 minutes after the ignition is switched off. (On R53's)

**Howerton Engineering** · 01-03-2012, 01:25 PM

(01-03-2012 01:22 PM)Canyon Factory Wrote: The ECU stays active for 5 minutes after the ignition is switched off. (On R53's)

The changes we made to the HFS-3 when it was designed helped eliminate a similar issue on the 53's, now the 56 is doing something funny.

It's odd how the fuse back plane would drop before the injectors/ECU on the 56, unless there's a capacitor somewhere holding it on. I'll have to look at a car with a meter and see the best way around it.

BostonR56S · 01-03-2012, 01:30 PM

Yeah I wasn't trying to say the CV has stopped the pump from pulsating upon shutoff. I used to notice it constantly everytime i drove the car as long as the wm had activated, if it hadn't, then there'd be no noise. I thought it was just the pump emptying itself upon shutdown or something.

As for the loud noise, mine clicks a lot, but I can only hear it when the seat is down. So to the poster asking about the noise, do you leave your seat up or down?

LASRGUY · 01-03-2012, 01:40 PM

I get the same 1 second pump surge on shutdown. I don't put the keyfob into the dash. Don't know if that would matter.

HbSean · 01-03-2012, 08:02 PM

(01-03-2012 12:50 PM)ThumperGP Wrote: Mine made the shut down noise, everytime. I thought it was normal?

I was pulling power from the OBD fuse...

I thought the same thing..