okay so I have been pieceing to gether my TurboII for about a year now....
Its almost done......
I am going to put in a Walbro fuel pump on monday when a friend asked me if I was going to run 2 pumps to prevent pressure drop since I am going to run 6 injectors......I didnt even think about that and I had discussed it several times before with some of the local tuners.
SO my question is does anyone have 2 pumps running in-tank and how did you wire them up????
The car is a 1987 TurboII and I will be running a a Rebic3 injector controller for the extra 2.

 

The number of injectors doesn't matter, only the flow and pressure required for the power you're making. Unless you plan of exceeding the Walbro's ~500hp capacity, I wouldn't bother over-complicating things with an extra pump.

 

Well according to the few guys I have spoken to at the shops I know out here my setup should be making around 370-410rwhp.......
This has yet to be seen since of course the car has not run just yet.
I am going with a half bridge motor........
So you mean the walbro is fine to handle 6 injectors??
I am going to use the stock primaries and the secondaries are going to be either 720cc or 850cc, I will decide after it gets dynoed, and then there is going to be an extra pair of 1600cc injectors at the throttle body for safety.........
I still don't know how this will all run on my car but once I start dynoing then I can figure out what I do and don't need.......right now I just have a bunch of new parts lying around to try out.....

 

That might be getting close to the Walbro's limits. Putting two pumps in the tank will be a major custom exercise. If you're making that much power I'd be considering a swirl pot and external pump or pumps. Personally if you really need more than the Walbro can provide I'd just look for a bigger one. You're going to be spending a lot on the fuel system anyway...

Like I said, the number of injectors is irrelevant. All that matters is how much fuel the engine needs.

The TB is a bad place for injectors. EFI manifolds are designed to run dry. Try to put them as close to the ports as practical.

 

I thought the same thing but I see so many pieces from japan such as RE amemiya and Rotary Run and also from Feed that replace the stock elbow over the throttle body inlet with a piece that holds injectors..........I did think that letting fuel hit this area would cause more inconsistency but I also considered that it might be worth a try.........Thanx for the info...

 

The Japanese have a love of easy bolt-ons. I'm told it's because labour rates for custom work is very high over there. So unbolting the TB inlet and replacing it with one that has injectors bosses in it will cost them a lot less than having someone remove the UIM and weld injector bosses onto the runners where they should be. It's a common misunderstanding that if the Japanese do it, it must be good...

 

I can't agree with that more.......I saw it so much when I was working for D1.....I got to see alot of stuff from Japan...some of it made no sense other than ease of use when you stand back and use common sense......none of the track prepped cars use more than a couple of items that RE amemiya sells in their catalogs....Everything is custom made and fabbed right, when it comes to a track car even if its back yard built.

JDM is cool but its not always best!!!!!