DSX Aux low side constantly running
Thread Starter
Drifting
Joined: Aug 2019
Posts: 1,859
Likes: 1,264
From: Houston
DSX Aux low side constantly running
Hello my car is being put back together at the moment and the shop working on it noticed the DSX auxillary low side I have is coming on anytime the pedal is pressed. Even when the car is turned off! Apparently when doing a compression test the car used quite a bit of fuel. They're going to look to resolve the issue, but what issues could this cause? My questions:
- Would this affect MPG? Have I been getting less fuel efficiency because the lowside runs at any throttle position instead of when the car is in boost?
- Would this affect my tune? Would the tune be expecting this extra fuel at all times instead of at boost/wot?
Melting Slicks
Joined: Aug 2004
Posts: 2,339
Likes: 483
The dsx c7 system is wired through the can system and even with the car off and depressing the gas pedal you can activate that pump and it will modulate depending on how much throttle is applied. The car needs to be properly tuned for it. In regards to fuel consumption I’m not sure but would think if tuned properly won’t make a difference because it’s part of the lowside working to supply the high side.
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,478
From: South Florida
In the Corvette the DSX low side has to be tuned for properly as it uses the CAN BUS to determine when to activate. Anytime desired fuel flow exceeds the threshold in the tune, the pump turns on. But you have to change the tune so that it deactivates as well. The Camaro setup is different where it operates off of boost via a hobs switch.
Not sure on the pump tuning on when the gas pedal is depressed with the car off. That doesn't sound right at all. I would question their installation.
Not sure on the pump tuning on when the gas pedal is depressed with the car off. That doesn't sound right at all. I would question their installation.
Drifting
Joined: Jun 2000
Posts: 1,577
Likes: 99
From: Dubai, UAE
To the OP, I would question your tuning. It might be setup to request high flow all the time even at idle, which accordingly would cause DSX to run continuously
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,478
From: South Florida
Intermediate
Joined: Jun 2019
Posts: 36
Likes: 2
The Dsx pump does need a few adjustments in the tune. This will allow it to activate under high load. However even after proper tuning the pump will run when pedal is pressed with engine not running. This is a built-in feature. It is nice if you need to drain your fuel tank.
Drifting
Joined: Sep 2016
Posts: 1,585
Likes: 866
The Dsx pump does need a few adjustments in the tune. This will allow it to activate under high load. However even after proper tuning the pump will run when pedal is pressed with engine not running. This is a built-in feature. It is nice if you need to drain your fuel tank.
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Thread Starter
Drifting
Joined: Aug 2019
Posts: 1,859
Likes: 1,264
From: Houston
The Dsx pump does need a few adjustments in the tune. This will allow it to activate under high load. However even after proper tuning the pump will run when pedal is pressed with engine not running. This is a built-in feature. It is nice if you need to drain your fuel tank.