Walbro's new 400LPH pump: X-specific discussion

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Jan 5, 2012 | 02:33 AM

#106

Beeble

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From: Australia

Little update FWIW
3mm drill = 30psi base pressure - lowest it will go
i have mine set to 45 though with 1100s
many tanks run down to the fuel light now with no pickup issues

hope that helps someone!

Jan 5, 2012 | 03:45 AM

#107

2003evo8

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From: FLO-RIDA

with the dw 300 i was losing fuel pressure while tunning becase of it over heating and switch to a walbro 255 and it seemed to flow better and never lost fuel pressure again

Jan 5, 2012 | 05:13 AM

#108

mrfred

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From: Tri-Cities, WA // Portland, OR

Quote:

Originally Posted by 2003evo8

with the dw 300 i was losing fuel pressure while tunning becase of it over heating and switch to a walbro 255 and it seemed to flow better and never lost fuel pressure again

Posted in the wrong thread?

Jan 5, 2012 | 05:21 AM

#109

mrfred

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From: Tri-Cities, WA // Portland, OR

Quote:

Originally Posted by Beeble

Here's an update :

Walbro 400 on stock wiring
OEM return system drilled out to 3mm, micro filter removed and housing "ported"
Using AFPR - can get base pressure around 40. i have my idle set at 40, so base is 45
As soon as the relay trips, fuel pressure shoots up to 60 (I'm guessing this is around 70-80 Load - just a little bit more throttle than for cruise)
Have run tank down to the Fill Up chime with no issues

running on 93 with FIC1100s FWIW

so far, so good!

Are you still having the fuel pressure issue? If yes, I found the table in my ROM that trips the low/full voltage relay, and I can probably find it in the Evo 10 ROM.

Last edited by mrfred; Jun 4, 2012 at 07:50 AM.

Jan 5, 2012 | 07:43 AM

#110

murlo26

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From: Minnesota

Quote:

Originally Posted by mrfred

Are you still having the fuel pressure issue? If yes, I found that table in my ROM that trips the high/low voltage relay, and I can probably find it in the Evo 10 ROM.

That could be very useful I would imagine for a lot of us. For the bigger pumps to delay it would probably help.

Jan 5, 2012 | 09:45 AM

#111

RazorLab

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From: Mid-Hudson, NY

Quote:

Originally Posted by mrfred

If yes, I found that table in my ROM that trips the high/low voltage relay, and I can probably find it in the Evo 10 ROM.

yes please.

Jan 5, 2012 | 10:04 AM

#112

Hiboost

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From: Rochester, NY

Good info guys, helps me plan my fueling as I build up the car again.

Jan 5, 2012 | 06:39 PM

#113

mrfred

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From: Tri-Cities, WA // Portland, OR

Quote:

Originally Posted by razorlab

yes please.

As I suspected, it was cake to find it in the Evo 10 ROM. The subroutines for this algorithm are exactly the same betwen the Evo 10 and Evo 8/9. Here are the tables for 52680015.

Code:

<table name="Min Load for Fuel Pump Full Voltage" category="Fuel" address="58f92" type="2D" scaling="Load8">
  <table name="Engine Speed" address="60d32" type="Y Axis" elements="16" scaling="RPM"/>
</table>

<table name="Fuel Pump Low/Full Voltage Hysteresis" address="53488" category="Fuel" type="1D" scaling="Load16"/>

If anyone wants to log the associated bit in EvoScan, the definition should be:

Code:

<DataListItem DataLog="Y" Color="" Display="Fuel Pump Low Voltage Status" LogReference="FuelPumpLowVoltageStatus" RequestID="238085EB" Eval="x bit 64" Unit="on/off" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="0" GaugeMax="1" ChartMin="0" ChartMax="1" ScalingFactor="1" Notes="" Priority="1" Visible="False" />

For this EvoScan definition, when EvoScan reports a value of 1, the fuel pump is in low voltage state.

This will be my Evo 10 disassem contribution for the year.

Last edited by mrfred; Jun 3, 2012 at 09:29 AM.

Jan 5, 2012 | 06:45 PM

#114

scheides

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From: Minneapolis

mrfred FTW! If you haven't already you should make a dedicated post about this!

I have my 400 pump sitting on the table, I'll have some info to share early next week

Jan 5, 2012 | 08:13 PM

#115

01CBR929

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From: TN

Man... you all are making it look like I may need to go to a walbro 400lph pump, especially if one has control of when the relay trips.

Jan 5, 2012 | 09:55 PM

#116

murlo26

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From: Minnesota

Sweet! I wonder if this will help a dual pump setup like mine at all. Very useful regardless!

Jan 5, 2012 | 10:05 PM

#117

Beeble

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From: Australia

Nice work Mr Fred

heh yeah the tripping point would be great if it could be modified ....
so who feels like finding it for EDM roms?

53050009 / 53040010

Jan 5, 2012 | 10:08 PM

#118

Beeble

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From: Australia

And i take it from that table it's Load per RPM
(as opposed to just Load=x triggering)

very helpful!!

Jan 5, 2012 | 10:14 PM

#119

mrfred

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From: Tri-Cities, WA // Portland, OR

Quote:

Originally Posted by Beeble

Nice work Mr Fred

heh yeah the tripping point would be great if it could be modified ....
so who feels like finding it for EDM roms?

53050009 / 53040010

Golden should be able to sniff it out for the other ROMs.

Jan 5, 2012 | 11:06 PM

#120

tephra

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From: Melbourne, Australia

53040010/53050009:

Code:

<table name="Min Load for Fuel Pump High Voltage" category="Fuel" address="58f96" type="2D" level="1" scaling="Load8">
  <table name="Engine Speed" address="60d6e" type="Y Axis" elements="16" scaling="RPM"/>
</table>

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