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01-10-2020, 09:07 AM | #26 |
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NWIC
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Vehicle:2004 STi GTX3076R Rally Blue |
Yeah I think this is being over complicated, If it was the return system then I would likely be in the same boat.
I look at this very simply: Most cars running a surge tank and stock return set-up use a smaller pump feeding a large surge tank pump with zero issues. Op has the pump sizes backwards (likely needed the large intank pump before moving to the surge tank) big red flag. Ding ding ding. Lol Nearly all the fuel set-ups that "need" a return system modification are simply oversized for the application. The days of "fuel system limited" have changed into over building to the point of creating other issues.
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01-11-2020, 07:13 PM | #27 | |
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01-12-2020, 12:16 PM | #28 | |
Scooby Specialist
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Join Date: Aug 2012
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NWIC
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Vehicle:2004 STi GTX3076R Rally Blue |
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01-13-2020, 09:19 PM | #29 |
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Vehicle:96 3MI Racing search FIRST, then PM!!! |
Totally missed that he had the 450 feeding the 044. I agree with scaling down the lift pump. That thing is probably "filling" that surgetank 10 times a minute
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01-23-2020, 01:25 PM | #30 |
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Member#: 25768
Join Date: Oct 2002
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RMIC
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Vehicle:2003 XONA 9569S 40++ 2.3 slobaru |
whats up with the top hats on your coilovers?
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01-25-2020, 01:13 AM | #31 |
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01-25-2020, 09:45 AM | #32 |
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Member#: 39487
Join Date: Jul 2003
Vehicle:2006 sti obp |
I agree guys that the 450 is overkill as a lift pump that was just the natural progression from big pump in tank that couldn't keep up to adding the surge tank setup. Now that I pulled the fuel pump to investigate the jet pump i have a dilemma. Do I swap back to the OEM pump and put the radium jet pump on the return to tank with the largest orifice and risk possibly over pressuring the surge (probably not likely with the stock pump) or do I test adding the radium unit with the smallest orifice to the supply line on the 450 and leave the return to tank unobstructed? I think im going to set up a test tank in the garage this afternoon and see what I can come up with.
As for the top hats you are correct more caster FTW Last edited by awdturbo04; 01-26-2020 at 11:03 AM. |
01-25-2020, 05:37 PM | #33 |
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Location: Menzel Lake, WA
Vehicle:06 Red Ltd.Wagon Dom 1.5xtr JJ tuned |
I'll reiterate that my tuner put an AEM 340 in as a lift pump, with my underhood Radium surge tank using 450. I don't believe he mentioned anything about changing the orifices. Still runs perfectly.
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01-26-2020, 11:23 AM | #34 |
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Vehicle:2006 sti obp |
I ran a test with the venturi on the feed line directly off of the lift pump. Running the smallest orifice and adding a 5' length of hose between the supply and return of the hanger. I was very happy with the amount of suction that was created. It emptied a drinking cup in about 10 seconds. Judging by the volume coming out of the return in the test I don't think there will be any problem sacrificing the little pressure off the supply to run the venturi and still keep the surge tank well fed. this allows me to run no restriction on the return. Again as others have mentioned there is more than one way to skin this cat but this is the way im going to go.
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01-28-2020, 09:24 PM | #35 | |
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Nice! That will definitely keep return restriction at a min I still have my other two orifices and could swap to this route if needed. For now my plan is to use one of the two returns with the largest orifice and any backpressure would be relieved by the other return. This is assuming flow from one return is enough to make the venturi work. |
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05-30-2020, 06:18 AM | #36 | |
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but like you said will this even work at low speed like how much back pressure does system need to operate at? Like i am in exact same boat i got 450 acting as lift (connected to factory speed controller) that fills up radium surge tank with fuelab pump in it, the fuelab pump is going back to fuelab for like 3d time so far lol, and im running wally full time rewired to run 100% now, and my regulator cant regulate for **** now as i have my radium venturi set on return with biggest hole. I hate all the options just makes me want to cut flat tire compartment in trunk and trow radium fuel cell in lol Last edited by Bariga; 05-30-2020 at 02:42 PM. |
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05-30-2020, 04:13 PM | #37 |
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Vehicle:07 STi Limited EFR 8474 TS EWG |
i think im just going to remove venturi completely make the return free flow into the gas tank, and trow this little guy some where on top of fuel tank for the fuel transfer
its compatible with E85 as well https://www.holley.com/products/fuel...s/parts/12-426 |
05-30-2020, 04:25 PM | #38 |
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If the driver side tank goes low, it will not add air to the fuel going to the surge tank. The outlet nipple of the venturi will still be putting out some fuel, because of the lift pump. The fuel only leaves the T that leads to the venturi, doesn't go the other way.
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05-30-2020, 04:45 PM | #39 | |
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05-30-2020, 04:49 PM | #40 | |
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If his setup worked the way you believe it does, air would get sucked in all of the time from the venturi section, and go into his surge tank. It's not going to change how it works once the driver side is depleted, fuel will still leave the venturi nipple as before. The only difference will be that some air leaves the venturi nipple with the fuel from his T. He came up with a clever design, and while he will lose a little volume out of the venturi, the pump will still move more fuel than is needed the majority of the time. Last edited by 2slofouru; 05-30-2020 at 04:55 PM. |
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05-30-2020, 04:56 PM | #41 | |
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Vehicle:07 STi Limited EFR 8474 TS EWG |
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With radium venturi on biggest orifice hooked up on return and walbro 465 running half speed there is around 12 psi of back pressure, running it full speed creates over 30 psi pressure where regulator creates big swings in differential fuel pressure (up to 8% fuel compensation at light / medium loads "Very bad!") IMO wile running any size pump larger than stock you need to remove all the restrictions from return and have it free slow. A lift pump speed controller is option based on back pressure but that just over complicated. |
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05-30-2020, 05:01 PM | #42 | |
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The inside of the venturi on the inlet side (from his pump) has a smaller diameter orifice that leads into the chamber where it blows past the side inlet of the venturi then straight out the opposite end with the nipple open to the fuel tank. The velocity of the fuel leaving that small orifice combined with the enlarged chamber and orientation of the orifice that connects to the driver tank feed hose creates the pressure difference that draws from the driver side. Even if there is no fuel on the driver side, the fuel will just jet right past that inlet hole and out the other end. The fuel will not change direction. He's not using typical return flow to power the venturi, where back pressure would be detrimental, he's using a pump that always provides positive pressure. |
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05-31-2020, 12:31 PM | #43 | |
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Vehicle:07 STi Limited EFR 8474 TS EWG |
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any how i took my hanger out last night and found that my radium venturi not even connected any more Hose expanded and just got disconnected so it was there but aint sucking fuel from 2nd chamber. I completely removed venturi and bought Edelbrock 30 GPH Fuel Pump, installed under driver side fuel cap (had to take the pumps case/ holder out) Pumps good amount of fuel and uses 1 amp free flow. Going to trigger via ECU on few different conditions with 3 min run timers. |
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06-01-2020, 09:24 AM | #44 | |
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I was going to set it up with a venturi on the feed line like several posts up but this eliminates that whole hassle and worrying about how much return flow you have... too little... too much. |
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06-01-2020, 01:59 PM | #45 |
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Vehicle:07 STi Limited EFR 8474 TS EWG |
Already got this little pump setup and running, cant hear it when car is running. set it up to activate on Lat and Long G-force over 0.5G
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