my injector setup, is stock 550's in the stock rail, along wiht 1600's in an aftermarket rail, i use the stock rubber lines all the way to the primaries, then a rubber line and banjo bolt to the secondary rail. I'm going to be running dual pumps with a Y-ed, AN feed, was wondering what the easiest way to get that type of line to adapt to the stock primary rail. any help would be great,


also what size AN line wold you reccomend to flow fuel for up to 550whp

 

The supra tt pump (once hotwired to the battery) will support 500 rwhp, as per Ari at www.rx7.com. If you are going to be making 550, then you'll need something else. In my experience you would be better off with one high capacity pump vs two to minimize the complexity of your setup and potential problems down the road.

Having said that, I know there are people running dual pumps with success, so I am sure they will chime in.

Also, to make 550 rwhp you'll need to upgrade your injectors (stock 850 sec's in the primaries being the simplest way) to keep the duty cycle controllable/less than 90%.

 

I run dual walbros.

Each are wired to a seperate 40A relay.

I run dual feed lines with the dual pumps.

I run the stock feed and return line as my feeds (each pump feeds a seperate line) and the stock vent line (runs from the engine bay to the charcole canister above the driver's side axle) as the system's return. This setup also requires a vented catch can, as your stock PCV system will be incomplete.

One feed line runs into the primary rail, the other into the secondary. They then come out of the rails and run into either side of the fuel pressure regulator.

The return then runs, as mentioned above, through the stock return line.

If you want to make 550rwhp, you are going to need to put some money into your setup. Rubber lines are ok, but not ideal. (screw trying to pull rubber hoses off...)

If you run this setup, you need to tap the gas tank bulkhead for the extra line.

I dont think that y'ing the pumps together is a particularly good idea. If you loose a fuel pump, you will not notice a loss in fuel pressure when driving under normal conditions, as one pump can handle the load. Then under boost you will not be able to supply the engine with ample fuel.

My advice, if you dont want to do dual pumps correctly, just buy a higher flowing single pump.

Check out www.kgparts.com (i think that is his site, mabye .net) and email keith. He will set you up with the correct fuel system. If you really are going to try to make that kind of power, dont cheap out on your fuel system. Overbuild!

 

lol all i want to know is how to run a feed to the stock primary rail. im not planing on driving around at 550whp.. thats just my goal on high boost and race gas, around town i plan to be making anywhere over 430whp.

 

It only takes one pull to blow your motor (and turbo) into bits.

 

^^^ So true, don't ask me how I know........

 

**** it, im ordeing an aftermarket rail, and putting my 850's in it and running 2 feeds. u guys convinced me... go big or go home, gotta do **** right the first time.

 

Do your return lines merge into one before connecting to the regulator? If so, the two rails/pumps are not going to operate as separate systems.

Have you looked at the pump flow test results? There's not a lot of margin for error even at 14V, depending on what boost level the power is made. You could go up to 16V, but I'm not sure how long that would work :p

 

No, I used the regulator as the merge point. My Aeromotive Regulator has 2 INs and 1 OUT. Basically I used my regulator as a T.

 

I think that is similar to the SX regulator I have. If the two lines collect in a cavity before the regulator valve the pressure will equalize on the feed side of the system regardless of whether you merge the pumps there or in the tank. Fluid always takes the path of least resistance. Now if each input port has a separate valve that is different.

For my car I am going back and forth on whether to run 2 -6AN feeds from the pumps to the rails and use the stock feed as a return or merge the pumps in the tank and run 1 -10AN feed. Economically, both are about the same since the bigger lines and fuel filters are more expensive. I am leaning towards the -10 because I think it will be a little lighter and there are less fittings to worry about leaking.

 

Funny, about the time you posted this I was revving out 2nd gear in front of your apt . My FD sounds like a damn harley/chainsaw now with the straight mp and bored-out hks catback.

We can talk more about the pump when you come over, I have been thinking of upgrading it......

 

One supra or walbro will NOT support 550. I have been to several tuning sessions and the supra and walbros max out and start to drop fuel pressure in the low 400's. NOS makes some parts that my friend used for his dual supra pump setup try there.

 

thats why the post is about dual pumps... im shooting for 550whp in the future, and want to set up the fuel for it now.

 

I was just looking for a 2 to 1 fitting and the one I found only steps down 1 size (1) -10AN to (2) -8AN. Does anybody know what size line fits best over the pump? My guess is something closer to a -6AN.

 

Just measured mine with a clear ruler. The pump outlet O.D. is 9MM (+/- 1mm). That is slightly larger than the I.D. of a -6AN hose.

 

Sure, 500FWHP. I couldn't get that on mine. It's wired for the constant high voltage output and has a 30A fuse that runs to it from the battery. That way it's always on high voltage.

I maxed out my pump at 485hp, and I was spraying methanol too..

The pump was maxing out my injector duty at 430hp on pump only and the injectos were trying to make up for the pressure drop.

I am going to get another one and run the dual setup.

 

You're 100% right. With all of the fuel pump research I have done lately, it points to all of the same information. Perhaps I misunderstand Ari, and he meant 500 fwhp, or maybe he said it supported an FD on one 500 rwhp pull? lol.

 

Yeah, it sorta sucks.

I have -6 steel under the hood, so it'll be easier for me to just run another pump rather than a larger single (like the R34 pump) and swapping to -8.

This setup will run me around $500 with all the parts I need and I can do the install myself. Only thing I see being a PITA is getting the fittings through the fuel housing door. Other than that, its pretty simple. ErnieT did his that way, and I was going to follow his setup... I've seen others do it to.

Run two pumps, each pump feeding their own fuel rail, then have them both T into the Fuel pressure regulator, and then the regulator output goes back to the tank return line.

I also saw someone use the stock feed/return to feed each pump, and use the charcoal line for the return.. I might do that as well.