Spoolin

I believe four ID2000's flow around 9200cc minimum at 45psi and can handle upwards of 130psi and flow as much as 14,800cc. As for the 340's, two flow around 10,600cc/min at 45 psi and as low as 7400cc/min at 85 psi.

hatrickstu

The pressure capability of the injector isn't even a relevant point to bring up here. An injector only cares about differential fuel pressure, so if base pressure is 45psi and you are using a 1:1 regulator the only thing you need to know is what the injector flows at the base/differential pressure. This is assuming the fuel pump(s) can continue to keep fuel pressure 1:1 in relation to boost. Thus, four ID2000's at 45psi flow 8,900cc/min. The fuel pump is opposite, it has to supply the base PLUS the boost pressure. Two Full Blown 340's at 80psi (45psi base and 35psi of boost) only flow ~5,900cc/min.

So how have you arrived at both supporting roughly 900whp on E85?

For your knowledge, two of the Full Blown 340's do not flow anywhere near 10,600cc/min at 45psi either, it's more like 8,500cc/min.

(All of these numbers are assuming ~12.5v at the pump)

Spoolin

I'm basing my numbers off the Aeromotive 340's that flow about 30% higher. I arrived at believing dual 340's should get around 900 whp on e85 if I was able to get to a little over 800 whp with dual 255's on e85.

Charper732

any reason why you would go 340s over walbro 450s? I had a brand new 340 and it would loose pressure as soon as it got hot on the dyno. I felt like an idiot for not just going with the 450 from the beg. as there isn't much of a price difference

hatrickstu

800whp on E85 with two 255's at 80psi total system pressure? What did you do for wiring? How much voltage actually at the pumps?

Even at 13.5v to both pumps you are only talking about ~6,560cc/min, which is still less than a set of ID1700x's flow at 45psi. Seems a little off man. I am really not trying to be a dick, but flow data is hard to argue with.

Spoolin

Crunching numbers is not an exact science and an end all be all, there are way too many variables involved. Those calculations give you a rough estimate of where you could be with xyz. Base pressure was set to 52 psi, total pressure was around 86 psi and the relief valves on the pumps were eliminated. We dynojet tuned to 741 whp on e85 at 29.6 psi with a 6262 on the stock 11:1 block and injector duty was around 86 or 88% at the time. My tuner, later down the road, turned the boost up to 34 psi but we never dynoed again and estimated it was putting down a little over 800 whp with some calculations. Duty cycle was around 95% at that time. Voltage to the pumps was a minimum of 13.5v as everyone knows that with the engine running and alternator going as they almost run constant anyway, your voltage will be between 13.5 and 14v. I run an 8ga cable from the battery to two relays that then split to 12ga wires to the pumps.

I've run many different calculators in the past trying to get a rough estimate to where my current setup will get me and all of them have stated 900-950 whp with dual aeromotive 340's and the 2200cc injectors. The OP's setup should be able to do the same.

Spoolin

450's seem to be a bit tight in the hanger but it is duable. I'd prefer to see what number my dual 340's will get me to and then I'll upgrade from there. More than likely going with one 340 pumper to a 1800hp Prodigy pump in one of the slick surge tanks or just the intank 1800hp Prodigy power module in the tank.

hatrickstu

The flow numbers don't lie man, its not magic. I am using our internal flow numbers for the injectors we make and sell, and the numbers Walbro gives you for their pumps. Four ID2000's flow ~9,600cc/min at 52psi base. Now look at Walbro's published information on what two of those pumps flow at 86psi. It's right at 96gph for two pumps with 13.5v:

Walbro GSS-Line Fuel Pumps - 255LPH High Pressure - GSS340 GSS341 GSS342

96gph is 6,056cc/min. There is no wondering how XYZ factor into this. They are simple devices with published accurate flow data. Removing the pressure relief doesn't make the pump flow a shit load more, the flow is still going to continue to drop at a high rate as pressure increases. The IDC you are seeing is probably ****ed because fuel pressure is falling , causing IDC to climb. Open your eyes man.

hatrickstu

What do two 340's flow at the pressure you plan on using them at?

Spoolin

So, you're saying I didn't make 741whp on two 255's at 29.6 psi on e85 and the extra 4.4 psi didn't get me to 800 whp? On the most accurate chasis dyno out there that can't be manipulated? Dynojet's don't lie man.

When I get to 900 whp on two Aeromotive 340's, I'll be sure to post up.