200? Guess I'm not familiar with the line, but why that pump??

 

just like the walbro 255 but compatible with e85 and is silent (vs the walbro whining loudly)

 

Stop being a bitch and embrace the whine.

Jokes aside though the e85 bullshit is nothing but a scheme to get more money out of people. The natural rubber in the 70s couldnt handle e85.. all the new rubber thats part synthetic handles e85 just fine. That said the stock fuel pump and the rest of the miata fuel system handles e85 just fine.

 

Yeah, my buddy made 600 wheel (well, 597) on e85 on a 80's volvo stock pump for years.

The review I'd read said my 400 walbro should expect 10% shorter lifespan... In other words, infinitely longer than I would even need it for.

 

I've been running e85 for almost 3 years now... Undid the fuel system last week to swap to stock injectors... Everything is perfect.

 

Do you have any actual numbers to back this statement up? All the data I have says the exact opposite - the Walbro pumps are the ones that lose flow at high pressure (80psi+). In fact, the data I have shows that the Walbro 400lph 39/50 pump flows the same as a DW200 does at 100psi of output pressure.

 

Its the same **** with walbro 190 vs the 255. The 190 flows higher pressure vs the 255 so unless u need the extra flow from the 255 the 190 will be better for our tiny motors.

 

Right from DWs page and radium engineering's tests. The DW300 tapers off just like the Wally 255, just bumped up a few liters. Its flow and amperage graphs actually looks almost exactly like the aeromotive 340R, probably the same pumps with different labeling, except aeromotive might stand behind their products better. But the 240 liter/hour that you'll get driving an EV14 injector with a pressure differential it likes is not going to be enough to run ALLOFIT with a 6758 on e85. I want wally to come out with a direct fit or at least stock sock using version of either 400 pump, otherwise the wally 400 or bosch 044 are still the pumps to have for this application if you can figure out a better pickup or dont care about high g corners / running down below a gallon of gas.

 

What? DW got me an RMA # in like, an hour. They have a 3-year no fault warranty, at least on DW300.

I don't get the hate. Especially about the fuel pumps. When DW300 was released it was the best pump. Now that Walbro 400/416 are out, they are best.

 

I just finished reading this whole thread.

Wow.

 

+1. For like, mostly everything. I wouldn't hate on them, I just wouldn't buy one right now today. Awesome to know about the warranty handling.

 

This test?


I still don't see data backing up your earlier statement ("the DW300 loses flow at higher pressure worse than the other options"). From what I can see, the DW300 does a better job maintaining flow than the Walbro 255 does, and a similar job to what a Walbro 400 39/50 pump does.

What, like an RMA in 45 minutes instead of an hour?

...except Soviet did it, and he posted datalogs showing good AFRs with 25+psi of boost? And he did it on 1000s, which require more base pressure than the new ID1300s would?

Are you just trolling? Nothing you've said about this topic is true.

 

The math looks a lot better for 1300s, but depending on exactly what fuel pressure and boost you end up with maxing out the 6758 you are right on the bubble. And when fuel pump flow required = actual fuel pump flow you dont have enough fuel pump. Soviet already put it over 400whp on 93, e85 should put it near 450whp, 240lph really isnt enough fuel pump flow for 500 crank hp

 

What are you talking about? It's obviously enough fuel pump, because it's been done, and the results were posted in this thread two pages ago.

You want it mathematically proved to you? 88.1%DC on ID1000s at 60psi base pressure is ~950cc/min per injector, or 228lph of fuel.

If he did ID1300s, he could drop the base pressure 15psi AND run 10% less duty cycle, and the pressure drop would give him another 10-15% of headroom on the fuel pump.

You're confusing me by posting things which are obviously incorrect.

 

But at 60psi base and 25psi of boost the pump is only flowing ~217lph. And all of this is assuming zero head losses though the stock fuel filter and fuel lines, which would be at least 5psi at this flow level, if not more.

 

Why not run the stock fuel pump in series with the after market pump?

 

I interpolated the flow data between 80-90psi and 13.5-16v.


As you can see its 229 lph @ 85psi/13.9V which is what I recall it was in datalog.

My fuel pressure sensor is at the fuel pressure regulator and I expect that's where it would also be in testing scenario - so loss of pressure due to fuel system restriction can be neglected.

229lph is 954cc/min, so I was running ALLOFIT for that pump.

 

You have different numbers than DW. They show 205LPH @ 90psi @ 13.5v. And still dont forget if you are at 85 psi at the rail you're still at 90+ at the pump outlet.

 

Look at the chart, bottom row, left side. 90 psi, 13.5V is 205lph.

Read my post.

"My fuel pressure sensor is at the fuel pressure regulator and I expect that's where it would also be in testing scenario - so loss of pressure due to fuel system restriction can be neglected."

 

Not quite bolt on, but definitely doable.



Will reconnect the wastegate tonight and see if I installed it right (e.g. if it holds pressure at 20+ psi, lol)