S
serpa4
Guest
Hello. 1st post on any group. Hope this works. I don't know squat
about electronics. However, maybe someone here can help. I replaced
my engine driven fan on my 2007 GMC with a set of electrics fans that
are wired through a 30 amp fuse for each of the two fans. However,
the fans are messing up my water/meth injection controller. The water/
meth controller pumps a mix of water/meth into my intake manifold
based on turbo boost. When my electric fan kicks in, the controller's
reading for boost and the temperature of the exhaust on its LED
display go to zero. The display still works/lights up etc, and
displays text, but just reads zero for boost and exhaust gas
temperature (EGT). I have a mechanical turbo boost pressure gauge and
a mechanical temperature gauge for the exhaust also. These, being
mechanical, keep working fine. If the truck is making 10 lbs of boost
then the cooling fans kick in for the radiator, the boost and EGTs
drops to zero. When the fan stops, the boost and EGT readings return
from zero to whatever they should be (10 psi/800 degrees). The boost
is picked up via a plastic tube and routed to the water/meth
controller which is digital in nature. The electric fans are
controlled by a pulse width modulator to allow for a variable speed
setup. The fan controller is mounted to the radiator's metal cross
member. I have two batteries in my truck. To further isolate the
water/meth controller from interference, I completely removed the +/-
of one battery and ran both the ground and positive wire from the
water/meth controller and its injection pump to the isolated battery
for power and ground. Nothing in the water/meth controller or pump
setup touches the truck or the truck chassis and it still stops
working when the fan turns on. For more trouble shooting, I have
trapped 4 psi of air in the controller tube for trouble shooting
purposes. So, the gauge always reads 4 psi weather the truck is
running or not so I don't have to actually drive to make turbo boost.
However, the instant I connect the fan and the fan turns on, the boost
and EGT readings go to zero. Unplug the fan or turn them off, the
boost and EGT readings comes back. I'm guessing is the problem is RF
noise. How do I stop this? I don't know anything about capacitors.
However, back in my youth, the electric motors in my radio controlled
cars ran capacitors on the motors to keep from interfering with the
radios. Please don't use technical stuff like thin film or what ever,
which means nothing to me. What I'm looking for is:
Hey, put a 100 whatever capacitor between the + and - of the motor and
see if that helps. The fans are both wired to a 30 amp fuse, so I
guess the capacitor needs to be 12 v and handle up to 30 amps? Just a
guess. Thanks to anyone who can help.
Also, tonight I made a very strange discovery. The fan is multi speed.
When the fan is on low, the controller functions as stated above,
messes up the water/meth controller. HOWEVER, when the fan switches to
medium speed, the boost starts working again. Here is the funny
part..........
When the fan switches from low to medium, the MECHANICAL boost gauge
(not the one built into the water/meth controller, goes up by up to
SIX psi instantly. The turbo has veins that move to change boost and
are controlled by the truck's computer. I can hear the turbo spool
and my butt can definitely feel a slight pick up in acceleration. So,
at cruising speed of about 65mph and the turbo making about 5 psi
boost on the mechanical gauge and the fan is on low, the water/meth
controller is not working... then the fan kicks to medium, and the
controller starts working, and the mechanical boost gauge raises to 11
psi. This is a real gain in boost from the feel and from hearing the
turbo. Its not extra horse power from the water/meth since it is not
injecting AND the pump is disconnected anyway for trouble shooting.
When the fan drops to low, the water/meth controller stops reading,
and instantly the boost on the mechanical gauge drops back to 5 or
so. What do you all think? Some thing isn't right here. How can the
fan cause the boost to change unless it's also messing with the truck
computer and not just the water/meth controller? The fans have their
own temperature sender unit in the upper radiator hose and don't
interface with the factory computer in any way.
I cannot return either unit since they were installed.
about electronics. However, maybe someone here can help. I replaced
my engine driven fan on my 2007 GMC with a set of electrics fans that
are wired through a 30 amp fuse for each of the two fans. However,
the fans are messing up my water/meth injection controller. The water/
meth controller pumps a mix of water/meth into my intake manifold
based on turbo boost. When my electric fan kicks in, the controller's
reading for boost and the temperature of the exhaust on its LED
display go to zero. The display still works/lights up etc, and
displays text, but just reads zero for boost and exhaust gas
temperature (EGT). I have a mechanical turbo boost pressure gauge and
a mechanical temperature gauge for the exhaust also. These, being
mechanical, keep working fine. If the truck is making 10 lbs of boost
then the cooling fans kick in for the radiator, the boost and EGTs
drops to zero. When the fan stops, the boost and EGT readings return
from zero to whatever they should be (10 psi/800 degrees). The boost
is picked up via a plastic tube and routed to the water/meth
controller which is digital in nature. The electric fans are
controlled by a pulse width modulator to allow for a variable speed
setup. The fan controller is mounted to the radiator's metal cross
member. I have two batteries in my truck. To further isolate the
water/meth controller from interference, I completely removed the +/-
of one battery and ran both the ground and positive wire from the
water/meth controller and its injection pump to the isolated battery
for power and ground. Nothing in the water/meth controller or pump
setup touches the truck or the truck chassis and it still stops
working when the fan turns on. For more trouble shooting, I have
trapped 4 psi of air in the controller tube for trouble shooting
purposes. So, the gauge always reads 4 psi weather the truck is
running or not so I don't have to actually drive to make turbo boost.
However, the instant I connect the fan and the fan turns on, the boost
and EGT readings go to zero. Unplug the fan or turn them off, the
boost and EGT readings comes back. I'm guessing is the problem is RF
noise. How do I stop this? I don't know anything about capacitors.
However, back in my youth, the electric motors in my radio controlled
cars ran capacitors on the motors to keep from interfering with the
radios. Please don't use technical stuff like thin film or what ever,
which means nothing to me. What I'm looking for is:
Hey, put a 100 whatever capacitor between the + and - of the motor and
see if that helps. The fans are both wired to a 30 amp fuse, so I
guess the capacitor needs to be 12 v and handle up to 30 amps? Just a
guess. Thanks to anyone who can help.
Also, tonight I made a very strange discovery. The fan is multi speed.
When the fan is on low, the controller functions as stated above,
messes up the water/meth controller. HOWEVER, when the fan switches to
medium speed, the boost starts working again. Here is the funny
part..........
When the fan switches from low to medium, the MECHANICAL boost gauge
(not the one built into the water/meth controller, goes up by up to
SIX psi instantly. The turbo has veins that move to change boost and
are controlled by the truck's computer. I can hear the turbo spool
and my butt can definitely feel a slight pick up in acceleration. So,
at cruising speed of about 65mph and the turbo making about 5 psi
boost on the mechanical gauge and the fan is on low, the water/meth
controller is not working... then the fan kicks to medium, and the
controller starts working, and the mechanical boost gauge raises to 11
psi. This is a real gain in boost from the feel and from hearing the
turbo. Its not extra horse power from the water/meth since it is not
injecting AND the pump is disconnected anyway for trouble shooting.
When the fan drops to low, the water/meth controller stops reading,
and instantly the boost on the mechanical gauge drops back to 5 or
so. What do you all think? Some thing isn't right here. How can the
fan cause the boost to change unless it's also messing with the truck
computer and not just the water/meth controller? The fans have their
own temperature sender unit in the upper radiator hose and don't
interface with the factory computer in any way.
I cannot return either unit since they were installed.