boostFedcivic

iTrader: (1)

anyone ever done this? i'm doing it tonight i'll let you guys know how it goes.

98 F Body. maxed out my single walbro

GMMillwright

iTrader: (4)

Very interested in how this works out. I'm in the same situation and don't want an external pump.

70GS455

Another option is to put the 044 externally in series with the in-tank pump. Output will be greater than a 044 alone.

boostFedcivic

iTrader: (1)

No sir, Pressure will be greater yes. but volume will be limited by the flow of the pump feeding the 044 from the tank. i have maxed out the single walbro, so adding a 044 in line will only keep the pressure higher.

The 044 is in the tank. it was a tight fit but it is in there. the gauge is on the E and the car still runs. through bumps, turns, dips, and everything in between. Seems like i did good.

I took tons of pictures and i will make a write up in the coming week.

No Juice

iTrader: (11)

In to see the pics of this ...........

Spoolinsteve

You have something wrong, when you match a 255 or something intank feeding a bosch 044, it increases the output of the second pump. It does not have anything to do with raising pressure. Many non-ls1 cars have been using the 255-feeding-044 setup with some success.

Don't get me wrong though, I'm not a fan of feeder setups.

70GS455

Both pressure and flow rate will be greater - pressure is greater to a larger extent, flow is increased to a smaller extent. 2 pumps in series will add head perssures at any given flow (just like 2 pumps in parllel add flow rates at any given pressure). So if pressure is greater at any flow, then it must be true that the flow rate is greater any given pressure.

Check it out on any flow test that provides a chart of flow-vs-pressure for the pumps individually and additively.

GMMillwright

iTrader: (4)

Bump for pix.

boostFedcivic

iTrader: (1)

No Juice

iTrader: (11)

All I see is a red X

boostFedcivic

iTrader: (1)

fixed

stevieturbo

The 044 can easily be mounted in-tank. and most of the recent one's Ive seen, already have a gauze inside the intake. So no need for an external sock, although would likely do no harm to use it.

Just look inside to see. In fact, pretty much any pump can be mounted in-tank.

As for 2 pumps in series. Flow will increase.

The 044 will be assisted by the other pump which will now flow a lot more than it normally would, as it is no longer having to create pressure.

So a Walbro will safely feed an 044, and in some respects assist it.

Although I'd never be a fan of using 2 pumps in series, unless it was via an external swirl tank or similar.

boostFedcivic

iTrader: (1)

the fuel sock also helps with pickup from the bottom of the tank.

No Juice

iTrader: (11)

What is the flow comparison between the single Bosch044 and twin Walbro255's?

stevieturbo

Only actual testing for each complete install will give you that answer.

But a pair of Walbros will flow more...but they will also still start to struggle around 70-75psi where flow drops off quite dramatically.

No Juice

iTrader: (11)

Do you think the 044 with a BAP will support 700rwhp on E85 with -8 feeds and -6 return?

stevieturbo

I would say not a hope in hell.

But then US ratings for the same pump far exceeed other parts of the world.

Generally its regarded as a 500bhp capable pump or thereabouts here in the UK ( flywheel, not wheel ). Some US sources would regard it as 700rwhp in single form. So you can see part of the problem.

I'd say 700rwhp is very optimistic. But its also part of the reason I rarely believe any power figures quoted.


For 700rwhp on E85, I'd say you need at least 2 pumps, or one very capable pump.

70GS455

Here is a plot from test data of a 340 and 392 in series:

http://www.turbobuick.com/forums/e85...ml#post2544027

It's one of the attached pdf files in that post.

70GS455

Twin W255's outdo a single B044 by quite a bit, for example twin XP's (W340 with epoxied-shut relief valve) are 105 gph vs 67 gph at 80 psi.

Production twin W340's are 87 gph vs 67

70GS455

Maybe. At 13.5V, you will be at about 68 gph at 75 psi which is enough for just over 600 hp (BSFC =.65 for E85). A few more volts may give you enough, haven't seen any test data at 15 or 16 volts tho....