Evo X upgrades

[mlomker]

Well, does it seem like this worked yet or do you not know yet?

I haven't tested it yet. I'm not in a hurry since I don't have the funds for a retune anyway. I need to sell some stuff.

[mlomker]

Went out to test the fuel system this afternoon.

http://blainegarrett.com/files/2009/07/failboat_arrival.jpg

[Swifty1638]

oh god. wtf. I can officially sympathize with you, and the ongoing bullshit that is this hobby :) What are the new ideas on the drawing board?

[Speedfreak]

This fuel system journey is painful to watch. It could be one of the most expensive series of failures I've seen.

[mlomker]

A few possibilities here:

1) My Bosch 044 is a lemon.
2) A Bosch 044 on its own can barely do 400whp @DB.

I'm a bit disinclined to waste another $200 on an 044 if it isn't adequate.

Anyone heard anything bad about Magnafuel pumps? The 4301 is obviously overkill but it's $15 more than the 4302 so I don't see a point in it.

http://www.summitracing.com/parts/MRF-MP-4301/

[mlomker]

This fuel system journey is painful to watch. It could be one of the most expensive series of failures I've seen.

The annoying thing is that I've had a lot of expert opinions along the way. I've kinda given up on them now. LJ gets a +1 for his surge tank probably not being the problem. It was a good idea to replace all those line with braided, E85-safe lines anyway. The new tank itself was 'only' another $200.

[Speedfreak]

The 044 is a tried and true pump. It supports an easy 600whp, and people have pushed 700+whp with a very efficient setup. I personally have supported 584whp on an nsx tuned by Shane(backed up in Chicago with 560whp on a stingy Mustang dyno in Chicago). If it's the pump, you have a lemon, otherwise it shouldn't be your issue.

Edit: I'd be willing to lend my brain to help you diagnose the issue if you want to stop by some time. I just can't watch this fuel system situation any longer.

[mlomker]

The 044 is a tried and true pump. It supports an easy 600whp, and people have pushed 700+whp with a very efficient setup.

On E85 or pump? When used inline with the in-tank pump or on its own, replacing the pump in the tank?

That's where things get tricky. Inline pumps flow more since they have fuel pushed to them rather than having to waste energy sucking it. E85 also needs 30%+ more fuel.

I've done a lot of Internet searching this last week and opinions vary a great deal. The most solid data I've seen is a guy that did 730whp on pump with a 044 that replaced his in-tank. That's comparable to what I'm doing (except my fuel tank is a small surge tank).

730 * .70 = 511.

Shane's dyno is about 12-13% lower than a typical Dynojet.

511 * .88 = 450.

That's still less than I'm getting by a meaningful margin. The problem is that I don't want to get stuck with TWO 044's that are worthless to me. I wonder if anyone has an 044 that they could lend me for a couple days.

[311evo]

The 044 is a tried and true pump. It supports an easy 600whp, and people have pushed 700+whp with a very efficient setup. I personally have supported 584whp on an nsx tuned by Shane(backed up in Chicago with 560whp on a stingy Mustang dyno in Chicago). If it's the pump, you have a lemon, otherwise it shouldn't be your issue.


This.

[mlomker]

This.

The symptoms are:
1) Run Bosch off of car's relay and it works fine up to current power level, car will hit 68psi as you'd expect with 25psi boost and 43 base.
2) Run pump off of car battery (using a relay) and it'll max at 55-60psi.
3) Run pump on BAP on the car or battery and it maxes in the low 50's psi.

The car's relay runs it at 9volts or so in low load situations so I'm guessing that the hotter the pump gets (from voltage) the worse that it works.

I've pondered it being a boost issue with the vacuum line to the fpr, but it works in the #1 configuration so that would seem to rule it out.