So what are the experienced single turbo owners running for fuel pumps? Have there been any consensus recommendations? I've been running the upgraded pump sold by RX7.com, but I think I'll need something more for my upcoming R85 kit. I tried to search but didn't find any meaningful threads right away with this topic.

 

I use a walboro 255, some people use the Supra TT pump, others use the nippodenso.

 

I run one nippondenso intank to surge and two bosch 044's up to the front.

 

I dont think the 255 walbro is quite big enough for an r85. I was recomended to the Apexi unit. I settled with the comso pump rx7trix is selling.

 

single Bosch 580254967
outflows 044, and is a great substitute for multiple pumps

 

Sean, the Bosch pumps you're running... Are the inline with each other after your surge tank or one in and one after? How are you running those? Also, aren't those pumps really loud?? Thanx in advance.

Rotarypower101, what's the cost on that Bosch pump and will it work in tank?

Zach

 

I'm aware of the 967 but wasn't what I was looking for in my setup.

 

With a little ingenuity it works very well. I made a special fitting for it because it is not just a drop in like the supra pump. It has a banjo fitting you can screw off and replace with a piece of 12x1.25 mm (I think that is the thread pitch) hollowed out threaded stainless rod. Turned some barbs in the top section of the rod and used a SS nut to secure it to the top of the FP. I also felt that it should be completely separated from the FP bracket so I got a piece of large fuel line that fit over the pump itself and SS hose clamped it to the FP bracket so it had a completely floating point setup with a flexible line to even connect the pump to the intake pickup. And used a ford motorsports filter I got from Ralph at groundzero that fit it perfectly

I think the price was right around 250 if I remember correctly, which when I was looking into seemed to be the best choice for me and my needs.

 

So your using the 967 intank?

 

Do you have any flow data to confirm?

The published flow figures from Bosch are 175 LPH at 5 BAR for the 967 compared to the 044's ">200" LPH at 5 BAR. Of course, Bosch's numbers tend to be conservative since they use N-Heptane to derive these rates (a chemical with different viscosity and density than gasoline). However, there is still a 25+ LPH difference in these tests.

The 044 has been tested at 228 LPH at 5 BAR with gasoline.

Thanks,

Gene

 

Here's a quick question. The Cosmo pump and the Nippodenso pump most people refer to - 2 different pumps or the same? Isn't Nippodenso the manufacturer of the Supra pump as well? Does anyone have part numbers and flow rates?

 

Up the voltage on any of the upgrade pumps and they should do up to 15psi perhaps 17psi, I suspect even the stock pump run at 15-17 volts would flow enough for 17psi perhaps more. If I were to do it over I would start with a boost a pump product to up the voltage and only change to an aftermarket pump if I could not maintain fuel pressure. Don't skimp on gages and just go out and buy/install an electronic fuel pressure gage for the interior.

I run the big Apexi intank pump at a 43psi base pressure, 62psi at full boost of 19 psi, with a rewired power supply direct from the battery (this gives another 1.5 volts or so over stock wiring) and this thing flows a ton of fuel.

 

About raising the voltage on your pumps. I know that they can handle some raise in voltage, but if you keep the voltage up and run the pumps hard, won't you really risk the chance of the pump burning out or failing prematurely from the added stress/heat produced from over working it? I don't know the answer to this, that's why I'm asking. I will appreciate any and all info about my questions. Thanks in advance.

Zach

 

twokrx7 has the answer...

i suggest you go to Kenne Bell's website and read all the tech info they have on their "Boost A Pump" product that they have been making for 20 years...

i run it along w a cosmo pump. the cosmo pump would be bordeline for my setup but w the BAP works just fine.

the BAP has a solenoid that triggers at 1 psi of boost and raises the voltage to the pump from zero to 50% depending on where you twirl the dial.

your pump only gets juiced at boost.... hmm, not a bad slogan.

the rest of the time it is on cruise so you don't have to put up w what sounds like an eggbeater in your trunk area or recycle your fuel at warpspeed when not necessary.

very well engineered... a good deal at $200. MSD also makes something similar.

howard coleman

 

i ran one upgraded intake from ari till about 22psi (t78) and that was about all it have afr got funny. so i run two intake and its more than enough now. its nice with the two bc you can run all braided thru the whole car rather than the steel **** and rubber hose.
Greg

 

in tank. typing too fast

 

two of them will fit in tank? That's cool, I thought that it wouldn't work that way. Rock on!!

Zach

 

yeah make a mount for it or someone even sells a braket i thinkand you mount it next to the other one and get another sock for the pump and use a bulkhead fitting to pipe it out. so you can run a full braided system.

 

Sweet. Thanx for the info. I'm thinking that would fuel a 20B just fine. That's the project I'm gearing up for. I would hate to starve that engine.

Zach

 

If the motor in the pump is capable of running at a higher voltage, then you can feed it higher voltage with the setup that Howard mentions or possibly with an aftermarket ECU with additional outputs. With an upgraded pump, you would ideally be feeding it switched power directly from the battery (which would be a marked improvement over the stock wiring).

Think about some of the stuff you have around your home. Look at the UL listing information. Notice that nearby it usually lists an input voltage range and not a specific number? Same thing applies. Apply the minimum voltage to get the device to operate (below the minimum and the device won't operate at all or not at the specs that the manufacturer intends...). A few more volts and you will help compensate for voltage drop and the other "ghosts" that affect a running automobile...

There was a thread a week or two ago about direct wiring a fuel pump that I commented in...

What will damage a fuel pump (from what I've run across elsewhere) is running it dry (ala fuel starvation) since it relies on the fuel for lubrication.

I will also point out this page:
http://www.wvinter.net/~flanham/wlan...l/fuelfaq.html

as well as reading the various fuel injection books to determine what adequate fuel flow you will require for your target horsepower. As mentioned, increased horsepower will have different requirements and all cars are not maintained equally, so you may have acceptably maintained equipment to do it one way but someone else may not...

Regards,
--Ashraf

 

I couldn't deal with the stock pickup anymore so I put a surge tank in. I got tired of having to worry about slosh. I have no more problems with it.

 

I sumped my fuel tank and I'm using a pair of Bosch '044 ,s too.

 

Increased voltage will increase your pumps output but it WILL shorten the life of the pump. Supra pumps are known for this .

 

Can anyone post pics and/or more details of this setup? Does it look similar to the Rotary Extreme setup? Wondering if anyone has had any issues passing track tech inspections either given that fuel lines have been modified and may be running inside the passenger compartment of the car.

 

i run 2 supra pumps intank, one for each fuel rail, i ran the pumps straight to the battery with a relay to turn them on/off, seems to work really well, we were running into fuel pressure loss with just one pump, with me being one for overkill i did this...