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Old 01-10-2022, 11:03 PM   #176
Jamaal
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Member#: 135979
Join Date: Dec 2006
Chapter/Region: SWIC
Location: Las Vegas, NV
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obp

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Could be simply not enough fuel, whatís your fuel pump set up? Or it could be your fuel pressure regulator not keeping pressure.
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Old 01-11-2022, 04:08 AM   #177
gtlyearsley
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Member#: 501308
Join Date: May 2019
Chapter/Region: RMIC
Location: Instagram: jeremy_yearsley
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2020 STI
741awhp (Taylordtuned)

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Quote:
Originally Posted by Jamaal View Post
Could be simply not enough fuel, whatís your fuel pump set up? Or it could be your fuel pressure regulator not keeping pressure.

Radium duel Walbro 450 in tank. With the aeromotive FPR. Hardwired fuel pumps. Iíll check the fuses and such when I get a minute. But this setup only as like 1000 miles if that lol. Hopefully nothing is crappin out yet
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Old 01-11-2022, 06:31 PM   #178
DillChill_36
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Location: Salt Lake City
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2005 STI
Aspen White

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Quote:
Originally Posted by gtlyearsley View Post
Car update:

So I got a new revised map from my tuner and he had me rev out to 7500rpm. Did the pull last night, granted Iíve never took it that far with any of the previous pulls on my setup.

So here is the dilemma I did 2 pulls for logs as he requested. And he replied saying ď Iím losing fuel pressure up top. So Iím guessing my second fuel pump isnít kicking on? The pump is hooked up to the relay with Hobbs switch and itís supposed to kick in after 10psi of boost.

Makes me wonder if the second pump was ever kicking on ever since the shop that performed the work.

Fuel pressure ramps upto around 73psi then just nose dives to 53 and I go lean obviously at redline.

If anyone has any insite on the subject feel free to throw ideas at me.

Electrical stuff isnít my expertise by no means lol.
The short version is your pumps cant keep up.

@73 psi each pump flows roughly 276LPH, combined about 550LPH. Just plugging your info into the Radium injection calculator you need about 622LPH @73psi. this was with ID2600x,%90 max IDC, 43psi base pressure, and 30 psi of boost.

http://www.radiumauto.com/Calculator.aspx

At these fuel pressures and above is where an "044" style pump really shines. Two of the AEM 400lph in line pumps @85 PSI flow a combined 700lph which leaves you head room. P#: 50-1005 400 LPH in line pump. if it were me thats what i would do for a big power build.

Im local in SLC let me know if you need help or want to ask a few questions.
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Old 01-11-2022, 11:45 PM   #179
gtlyearsley
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Member#: 501308
Join Date: May 2019
Chapter/Region: RMIC
Location: Instagram: jeremy_yearsley
Vehicle:
2020 STI
741awhp (Taylordtuned)

Default 741AWHP stock block 20 STI

Quote:
Originally Posted by DillChill_36 View Post
The short version is your pumps cant keep up.

@73 psi each pump flows roughly 276LPH, combined about 550LPH. Just plugging your info into the Radium injection calculator you need about 622LPH @73psi. this was with ID2600x,%90 max IDC, 43psi base pressure, and 30 psi of boost.

http://www.radiumauto.com/Calculator.aspx

At these fuel pressures and above is where an "044" style pump really shines. Two of the AEM 400lph in line pumps @85 PSI flow a combined 700lph which leaves you head room. P#: 50-1005 400 LPH in line pump. if it were me thats what i would do for a big power build.

Im local in SLC let me know if you need help or want to ask a few questions.

Mmm interesting! Ya man Iím in Layton area. DM youíre number if you wish

I was at 62% IDC on that log

Last edited by gtlyearsley; 01-11-2022 at 11:57 PM.
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Old 01-14-2022, 05:03 PM   #180
scoobyfast
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Member#: 338128
Join Date: Nov 2012
Chapter/Region: NESIC
Location: NJ
Vehicle:
2013 WRX
SBP

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Quote:
Originally Posted by DillChill_36 View Post
The short version is your pumps cant keep up.

@73 psi each pump flows roughly 276LPH, combined about 550LPH. Just plugging your info into the Radium injection calculator you need about 622LPH @73psi. this was with ID2600x,%90 max IDC, 43psi base pressure, and 30 psi of boost.

http://www.radiumauto.com/Calculator.aspx

At these fuel pressures and above is where an "044" style pump really shines. Two of the AEM 400lph in line pumps @85 PSI flow a combined 700lph which leaves you head room. P#: 50-1005 400 LPH in line pump. if it were me thats what i would do for a big power build.

Im local in SLC let me know if you need help or want to ask a few questions.

Throw a couple DW400 brushless pumps in there. 700lph at 80psi should cover your flow needs.
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Old 01-19-2022, 07:31 PM   #181
gtlyearsley
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741awhp (Taylordtuned)

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What size is the fuel return line on the STI anyone lol?
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Old 01-20-2022, 06:46 AM   #182
undyjr
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Location: Hampton Roads Va
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silica black

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It's a 6AN and should be sufficient with one of your pumps being on a hobbs switch.
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Old 01-20-2022, 01:10 PM   #183
gtlyearsley
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Member#: 501308
Join Date: May 2019
Chapter/Region: RMIC
Location: Instagram: jeremy_yearsley
Vehicle:
2020 STI
741awhp (Taylordtuned)

Default 741AWHP stock block 20 STI

Quote:
Originally Posted by undyjr View Post
It's a 6AN and should be sufficient with one of your pumps being on a hobbs switch.

For some reason I was thinking it was 4anÖ because I am using that as a return line. And I wanted to turn my car up more.

But my tuner says Iím losing fuel pressure up too. So is the 6an good for around 700-750ish whp??

Said 8an is good for moreÖ

Last edited by gtlyearsley; 01-20-2022 at 01:23 PM.
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Old 01-20-2022, 01:53 PM   #184
undyjr
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2019 WRX STI
silica black

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Quote:
Originally Posted by gtlyearsley View Post
For some reason I was thinking it was 4anÖ because I am using that as a return line. And I wanted to turn my car up more.

But my tuner says Iím losing fuel pressure up too. So is the 6an good for around 700-750ish whp??

Said 8an is good for moreÖ
Your factory supply and return lines are both 6AN. At your power level you should have an 8AN fuel line.
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Old 01-20-2022, 01:58 PM   #185
gtlyearsley
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Join Date: May 2019
Chapter/Region: RMIC
Location: Instagram: jeremy_yearsley
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2020 STI
741awhp (Taylordtuned)

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Quote:
Originally Posted by undyjr View Post
Your factory supply and return lines are both 6AN. At your power level you should have an 8AN fuel line.

Ok then thank you! So why do some people add a separate 6an return line on their builds I wonder

I have 8an feed yes
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