More volts is good, but an alternator is a lot of money just to get another 1-2 V at the pump. A BAP would be a better solution for that kind of money.

Based on the pump flow curve, my guess is that it can support 550 whp with 12.9 V and 80 psi at the pump. If I can get another 1 V to the pump, that alone should be enough for 600 whp. Dropping base pressure by 10 psi would be good for another 40 whp or so. The big "if" with the stock pump carrier is the back pressure created by the factory fuel filter. I really need to measure it.

What's the ID of the 3/8" line on the Subies?

 

great thread mr.fred! check your PM ive got something else we can try

 

What could a E85 416 support on stock wiring/lines at 12-12.5v on E85?

 

According to the manufacturer's flow data for the -267 E85 pump, with base pressure set to 3 bar (43psi) and 2 bar (30psi) of boost, the flowrate at 12V is reduced by 25% as compared to the flowrate at 13.5V. This means the amount of power the pump will support at the lower voltage is roughly reduced by 25% as well (e.g. 600whp becomes 450whp).

As for the factory lines, a recent experience with another user has shown that pump will overrun the factory return line at idle, even with the siphon drilled.

 

Im not sure how much it can support at 13.5v though, so it's making the calculation of what it could support at ~12v that I can't do (unless you're actually saying it could only support somewhere around 450hp).

Currently at ~420-440hp with a DW301 so I was expecting it to be more than that.

 

Looking at the flow charts, current draw, and given what we know from 255lph HP pumps and E85, my estimation is 35% more than a 255lph HP. That works out to around 530-540whp.

 

That's quite a bit. Interested by the finding some have shown the pump to overrun the stock FPR on stock wiring at idle even with the siphon drilled out to 3.5mm, we have a few guys here running them with drilled siphons with no overrun. Needing an FPR to get it down a touch more if it was higher than ~45psi without the vac line connected wouldn't be too bad if required though.

According to the 12v flow chart I'd be able to flow ~298 LPH @ 70 PSI at the pump and using 95% IDC at 3 bar rail pressure as the target that's 228 LPH.

 

I've not read about anyone experiencing overrun on the stock fpr if connected to the stock wiring. Link?

 

I've recently assistance in one such instance, but it involved an aftermarket FPR. I'm not sure I see why that would make a difference(?). But then again, unless one has a pressure gauge, he wouldn't necessarily be aware of an overrun problem.

CORRECTION: Looking back I can see that he had a rewire kit.

 

Might be worth a try, I have moderately upgraded stock wiring and my goals aren't high, but more than my current pump is capable of.

 

I've got the 267 in the stk carrier rewired and I had to drill the siphon in order to get the pressure down to an acceptable leve( it was 65 before drilling)l. I'm using an aftermarket FPR which will flow more than the stk reg. and with it backed off all the way I'm unable to get pressure below 44psi. Luckily this isn't an issue since I run 46psi base.

Check this thread:https://www.evolutionm.net/forums/ev...r-awesome.html

This is a single 400L pump on E-85 rewired
Aaron @ ER goes on to say that the power generated on STM's Mustang Dyno would work out to 646whp on their DJ. That should give you guys an idea on the capabilities of the single 267 pump on E-85

 

Was that STM car maxing that pump? So what on stock wiring something like 480+hp DJ if I assume 25% reduction over hardwire?

 

That's probably a safe assumption, so long as the wiring can maintain 12V at the pump under load. It should be noted that at 12V with 2.5 bar boost (5.5 bar rail pressure), the -267 pump draws about 50% more current than a 255lph HP pump (16.5A vs. 11A respectively), which obviously places significantly greater demands on the factory wiring.

See pages 299-300 here for graphical info:
http://www.tiautomotive.com/wp-conte...ic_Catalog.pdf

 

Does fuel pressure drop the same amount as the vacuum you pull at idle when you connect the vacuum line?

 

It's a 1:1 system so it should, right?