HFS-1 Intermittent Pump operation with DDS3 off
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From: New Hampshire, USA
HFS-1 Intermittent Pump operation with DDS3 off
So, my personal HFS-1 has been great... I'm off to the dyno Monday morning to see how much I can gain (this will be the only change since I made 350whp on a Mustang last month).
I have no backseat, no sound deadening, and no barrier between the back and the trunk, so I've got clear sight & sound to my HFS-1 pump and tank assembly... I also have the stock cat-back, so when cruising, I can hear everything.
I typically drive with the DDS3 turned off, and occassionally, I can hear the Shurflo kick in when it normally would if the system was turned on. AFRs do not go rich, however, so I assume the valve is staying closed and I am not actually spraying. I have the Trip Adj dial set to minimum in PWM mode, and with the system on, it usually sprays as I hit boost (2-4psi)
I'm not sure if anyone's reported this, for several reasons:
A) Most people probably leave the system on
B) Most people probably can't hear the pump turn on since they have sound deadening and loud exhausts
I seem to be able to temporarily heal this by turning the DDS3 on for a few seconds, then turning it off again... usually then the pump will stay off even during spool... but not always
It's intermittent, but often enough that I thought I'd make a post and find out if this happens to anyone, and to figure out why it might be happening.
Thanks, in advance
I have no backseat, no sound deadening, and no barrier between the back and the trunk, so I've got clear sight & sound to my HFS-1 pump and tank assembly... I also have the stock cat-back, so when cruising, I can hear everything.
I typically drive with the DDS3 turned off, and occassionally, I can hear the Shurflo kick in when it normally would if the system was turned on. AFRs do not go rich, however, so I assume the valve is staying closed and I am not actually spraying. I have the Trip Adj dial set to minimum in PWM mode, and with the system on, it usually sprays as I hit boost (2-4psi)
I'm not sure if anyone's reported this, for several reasons:
A) Most people probably leave the system on
B) Most people probably can't hear the pump turn on since they have sound deadening and loud exhausts
I seem to be able to temporarily heal this by turning the DDS3 on for a few seconds, then turning it off again... usually then the pump will stay off even during spool... but not always
It's intermittent, but often enough that I thought I'd make a post and find out if this happens to anyone, and to figure out why it might be happening.
Thanks, in advance
pm me your address, I will send you the latest version of DDS3v9 and see of it will cure the "off" trigger.
During the v8-v9 changeover, we may not have calibrated the "off" mode for enough to stop incoming signal to activate the pump circuit. I have just the latest batch of v9 and it behaved normally.
May appeared to be in the middle of the changeover time. (v8-v8a-v9)
During the v8-v9 changeover, we may not have calibrated the "off" mode for enough to stop incoming signal to activate the pump circuit. I have just the latest batch of v9 and it behaved normally.
May appeared to be in the middle of the changeover time. (v8-v8a-v9)
Last edited by Richard L; Jun 26, 2008 at 12:55 AM.
The v8 does not have this problem.
It is not advisabe to use v9 board on a v8 without modifying the v8 gauge as well.
If you have yet install the system, why don;t you sen d me the gauge and I will return both to you modified.
It is not advisabe to use v9 board on a v8 without modifying the v8 gauge as well.
If you have yet install the system, why don;t you sen d me the gauge and I will return both to you modified.
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Let me know if which version of DDS junction box do you have.
Richard...the "B" light is flickering...not lighting up completely like if it was tripped. Like some type of short...I had a problem with the V8 and Kevin installed a V9 junction box.
i think the flickering light is due to the incompatibility with the v8 and v9 boards with the respective v8 and v9 gauges 
unfortunately i got the email warning against that a while after i had switched them. i have a v9 kit here with a v9 gauge, i'm guessing we will have to replace the v8 gauge with this v9 gauge to work with the v9 board.
edit* and to make sense of all of this, piranas kit was one of the first kits i did. the HSV was installed in the engine bay which we learned was a no-no.
and some others, the HSV shorted out from the high temps in the engine bay. richard replaced the HSV thankfully, but very quickly there was another issue with the junction box (i'm sure it was related to the short of the HSV, as the HSV blew the fuse). i replaced the junction box with one from another kit i had on the shelf, which had the v9 board i believe (that or it was a v8a).
unfortunately i got the email warning against that a while after i had switched them. i have a v9 kit here with a v9 gauge, i'm guessing we will have to replace the v8 gauge with this v9 gauge to work with the v9 board.edit* and to make sense of all of this, piranas kit was one of the first kits i did. the HSV was installed in the engine bay which we learned was a no-no.
and some others, the HSV shorted out from the high temps in the engine bay. richard replaced the HSV thankfully, but very quickly there was another issue with the junction box (i'm sure it was related to the short of the HSV, as the HSV blew the fuse). i replaced the junction box with one from another kit i had on the shelf, which had the v9 board i believe (that or it was a v8a).
Last edited by KevinD; Jun 29, 2008 at 06:34 PM.
