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Old 01-10-2022, 10:03 PM   #176
Jamaal
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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, 03:08 AM   #177
gtlyearsley
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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, 05:31 PM   #178
DillChill_36
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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, 10:45 PM   #179
gtlyearsley
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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 10:57 PM.
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Old 01-14-2022, 04:03 PM   #180
scoobyfast
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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, 06:31 PM   #181
gtlyearsley
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What size is the fuel return line on the STI anyone lol?
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Old 01-20-2022, 05:46 AM   #182
undyjr
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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, 12:10 PM   #183
gtlyearsley
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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 12:23 PM.
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Old 01-20-2022, 12:53 PM   #184
undyjr
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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, 12:58 PM   #185
gtlyearsley
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Default 741AWHP stock block 20 STI

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!

Update: ordered new Vibrant PTFE line and fittings in -8 all around. And actually snagged the Radium fuel rails with the FPD.

Am going to be swapping them out for my IAG rails. Should be able to get everything installed this weekend as all the parts are scheduled to show up by Friday

Last edited by gtlyearsley; 01-26-2022 at 11:14 PM.
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Old 01-27-2022, 02:35 PM   #186
gtlyearsley
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Parts have shown up Iíll be installing this weekend!


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Old 01-27-2022, 06:20 PM   #187
no694terry
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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.
In the process of doing this same setup now. Currently on a single 450 with 6an lines and out of fuel. The 6an is probably most of the problem
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Old 01-27-2022, 07:16 PM   #188
gtlyearsley
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741awhp (Mikeytuned)

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Quote:
Originally Posted by no694terry View Post
In the process of doing this same setup now. Currently on a single 450 with 6an lines and out of fuel. The 6an is probably most of the problem

Nice man!

Ya I realized I had 6an lines feeding the rails from the IAG kit I purchased before I went rotated with a FP Red. It didnít dawn on me until I went back and looked through my receipts . And well looked over my lines.

I donít know how much the Radium FPD will help, but I guess they look cool.
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Old 01-27-2022, 10:57 PM   #189
silversurfer05
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Quote:
Originally Posted by gtlyearsley View Post
Nice man!

Ya I realized I had 6an lines feeding the rails from the IAG kit I purchased before I went rotated with a FP Red. It didnít dawn on me until I went back and looked through my receipts . And well looked over my lines.

I donít know how much the Radium FPD will help, but I guess they look cool.
What have you changed from the original 741 hp pull? The fueling at the time was definitely enough correct? So it has to be something that was changed after that
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Old 01-28-2022, 12:21 AM   #190
gtlyearsley
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741awhp (Mikeytuned)

Default 741AWHP stock block 20 STI

Quote:
Originally Posted by silversurfer05 View Post
What have you changed from the original 741 hp pull? The fueling at the time was definitely enough correct? So it has to be something that was changed after that

Well I switched tuners and low and behold I was running out of fuel up top. But the tuner on the original pull never said anything about it until I let my tuner now look at logs. And then I realized too I was running out

And I switched tuners just to see how and what is different and how the car feels for ****s and giggles If anyone wonders!!
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Old 01-28-2022, 09:04 AM   #191
K3rm1tth3fr0g
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Quote:
Originally Posted by gtlyearsley View Post
Well I switched tuners and low and behold I was running out of fuel up top. But the tuner on the original pull never said anything about it until I let my tuner now look at logs. And then I realized too I was running out

And I switched tuners just to see how and what is different and how the car feels for ****s and giggles If anyone wonders!!
Says a lot about your confidence in the original guy
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Old 01-28-2022, 09:08 AM   #192
silversurfer05
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Quote:
Originally Posted by gtlyearsley View Post
Well I switched tuners and low and behold I was running out of fuel up top. But the tuner on the original pull never said anything about it until I let my tuner now look at logs. And then I realized too I was running out

And I switched tuners just to see how and what is different and how the car feels for ****s and giggles If anyone wonders!!
On ethanol I think you can go as lean as 12.5, so it was leaner? I feel like the motor wouldíve popped already if it was running lean at these boost pressures, considering its stock components
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Old 01-28-2022, 10:37 AM   #193
PotatoFlakeSTi
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Quote:
Originally Posted by silversurfer05 View Post
On ethanol I think you can go as lean as 12.5, so it was leaner? I feel like the motor would've popped already if it was running lean at these boost pressures, considering its stock components
Holy smokes, right? How is the headgasket holding itself together?
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Old 01-28-2022, 10:43 AM   #194
K3rm1tth3fr0g
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Originally Posted by PotatoFlakeSTi View Post
Holy smokes, right? How is the headgasket holding itself together?

Prayers and crossed fingers.
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Old 01-28-2022, 10:51 AM   #195
Waddlz
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I was having fuel issues as well and thought I fixed it, and went and did a log for my tuner.

Towards the top of the pull, my AFRs at peak boost/timing were ~14:1 and the car still didn't knock and I was running ~28 to 29 psi on my EFR 7163. Ethanol is pretty amazing stuff.

turns out the walbro was just bad. Threw in a new 450 and its been fine since.
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Old 01-28-2022, 01:43 PM   #196
gtlyearsley
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741awhp (Mikeytuned)

Default 741AWHP stock block 20 STI

Quote:
Originally Posted by silversurfer05 View Post
On ethanol I think you can go as lean as 12.5, so it was leaner? I feel like the motor wouldíve popped already if it was running lean at these boost pressures, considering its stock components

It was at 14:1 lol

Quote:
Originally Posted by PotatoFlakeSTi View Post
Holy smokes, right? How is the headgasket holding itself together?

Itís still holding crazy. But itís a car that sits 99% of its life!!

Quote:
Originally Posted by K3rm1tth3fr0g View Post
Says a lot about your confidence in the original guy

Man I know live and learn

Quote:
Originally Posted by Waddlz View Post
I was having fuel issues as well and thought I fixed it, and went and did a log for my tuner.

Towards the top of the pull, my AFRs at peak boost/timing were ~14:1 and the car still didn't knock and I was running ~28 to 29 psi on my EFR 7163. Ethanol is pretty amazing stuff.

Yep that where I was for AFR too

turns out the walbro was just bad. Threw in a new 450 and its been fine since.
Perfect!! And yes it is especially I had 85% raw E


Quote:
Originally Posted by K3rm1tth3fr0g View Post
Prayers and crossed fingers.

Yes

Last edited by gtlyearsley; 01-28-2022 at 03:47 PM.
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Old 01-29-2022, 06:57 PM   #197
gtlyearsley
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741awhp (Mikeytuned)

Default 741AWHP stock block 20 STI

If anyone is interested in my old IAG fuel rails and Iíll throw in the 6AN PTFE IAG fuel lines also $200 shipped OBO my fellow people!



Last edited by gtlyearsley; 01-29-2022 at 07:08 PM.
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Old 01-30-2022, 08:33 AM   #198
motorbykemike
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Pm'ed you
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Old 01-30-2022, 02:23 PM   #199
undyjr
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Pm'ed you
No doubt!

A couple of months ago I would be all over that. To the OP thanks for spreading that subie love.
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Old 01-30-2022, 11:59 PM   #200
Anub1s
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Originally Posted by undyjr View Post
No doubt!

A couple of months ago I would be all over that. To the OP thanks for spreading that subie love.
Seriously. I just ordered this stuff and a few other goodies on Friday. Literally less than 24 hours later, a LOCAL guy puts this up.

FML.
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