fuel pump wire with high/low voltage circuit
Jan 28, 2012, 08:39 PM
#32
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Great news MrFred, i for see this being one of the most popular upgraded parts for 2012. continue to make the community bigger n better sir 
Jan 29, 2012, 08:52 AM
#33
I received the IR3313 that I ordered from Newark. Not impressed with the thickness of the leads. Hard to imagine that its build for anything more than a few amps of continuous current. I feel much more comfortable with a panel mount type SSR. In looking at the Crydom website, I found a few that have an onstate resistance as low as 0.01 ohm. I may try one, but for the moment, I'm leaning back towards electromechanical relays and have ordered a few from Newark that I'm going to examine.
There is also the AUIR3330 that is rated for 45A continuous that uses the same leads. There is plenty of capacity in there and that 7mOhm rating actually includes the leads.
FWIW, 18AWG TEFZEL wire is rated for 24A, to put size requirements in perspective.
I have to assume that since the circuit isn't really opening up and stopping current flow when this circuit switches that arcing really should not be a problem. Any automotive grade relay should hold up just fine despite the high number of cycles it will see.
Now if it was actually breaking the circuit all together and you had the inductance of the pump trying to force a back voltage on the switch, the quality of relay would matter more.
Jan 29, 2012, 03:26 PM
#34
That piece is RATED at 23A continuous current when heatsinked.
There is also the AUIR3330 that is rated for 45A continuous that uses the same leads. There is plenty of capacity in there and that 7mOhm rating actually includes the leads.
FWIW, 18AWG TEFZEL wire is rated for 24A, to put size requirements in perspective.
I have to assume that since the circuit isn't really opening up and stopping current flow when this circuit switches that arcing really should not be a problem. Any automotive grade relay should hold up just fine despite the high number of cycles it will see.
Now if it was actually breaking the circuit all together and you had the inductance of the pump trying to force a back voltage on the switch, the quality of relay would matter more.
There is also the AUIR3330 that is rated for 45A continuous that uses the same leads. There is plenty of capacity in there and that 7mOhm rating actually includes the leads.
FWIW, 18AWG TEFZEL wire is rated for 24A, to put size requirements in perspective.
I have to assume that since the circuit isn't really opening up and stopping current flow when this circuit switches that arcing really should not be a problem. Any automotive grade relay should hold up just fine despite the high number of cycles it will see.
Now if it was actually breaking the circuit all together and you had the inductance of the pump trying to force a back voltage on the switch, the quality of relay would matter more.
I generally agree with you on the lack of driving force for an arc with the high/low relays, but if you ever followed the Evo 10 relay issue that was causing Evo 10's to run lean, it was the high/low voltage relay that was getting trashed by arcing. I popped open the high/low EM relay I had been using for no more than 500 miles, and the contacts looked nearly perfect (as it should for such low miles). There was just a thin black ring around the contact area.
Last edited by mrfred; Aug 20, 2012 at 06:03 AM.
Aug 20, 2012, 04:16 AM
#36
sry for bumping the thread and a couple of stupid questions, but perhaps someone looked into that already.
can we use green/blue fuel relay from evo x (the one they're replacing oem black relay with) for doing that rewire?
from what i've read it's spec'd for 35 amps and normally opened. also, widely available.
do we need a diode with that?
can we use green/blue fuel relay from evo x (the one they're replacing oem black relay with) for doing that rewire?
from what i've read it's spec'd for 35 amps and normally opened. also, widely available.
do we need a diode with that?
Aug 20, 2012, 07:49 AM
#38
can be hooked up with these parts.
socket: bosch 3 334 485 046
connectors (2x): tyco(amp) 42238-2 / bosch 1 901 355 975 4.8 x 0.8 mm
connectors (2x): tyco(amp) 42282-2 / bosch 1 904 492 016 6.3 x 0.8 mm
i still don't know if a diode is needed.
perhaps spoolinup will do the right kit?
Sep 23, 2012, 05:07 PM
#42
Oct 2, 2012, 08:44 AM
#43
there is no way to avoid some overrun when using the walbro 400/465 pumps with the stock return system and the factory dual voltage setup. i can get pretty close to perfect but not quite. drilling out the siphon hole can potentially fix the issue, but i haven't verified it yet. a three-step voltage would fix it for sure.
