AMS Ultimate Fuel Pump Test

AMS · 04-06-2007, 07:15 PM

Quote:

Originally Posted by AMS

Well to put things to rest we've taken the initiative and built our own fuel pump test rig and conducted a series of tests. If anyone has any pumps to test let me know and we'll have Chewbacca run it on the test rig.

Here are some pictures of the rig

We're basically using a variable voltage power supply to run 12V and 14V to different fuel pump configurations. The pumps feed into a fuel pressure regulator and we measure the bleed-off at that pressure. We fill a graduated & calibrated container and track how much time it takes to fill, then with a simple calculation you get flow in liters per hour (LPH).

For starters the base fuel pressure in a stock fuel system is around 42psi, then it goes from there. For every 1psi of boost you add 1psi of fuel pressure. So at 20psi you're running 62psi of fuel pressure. At 28psi boost, 70psi fuel pressure. 40psi of boost, 82psi fuel pressure, and so on.

We learned a few interesting things, especially with the EVO VIII & IX pumps. The EVO VIII pump has a pressure relief valve that opens up at around 65-68psi and the flow output drops dramatically after that, eventually going to zero flow around 75-80psi. The IX pump flows a little more than the VIII pump at lower pressures but doesn't dump the flow at higher pressures. That's the reason you can make decent power at higher boost levels with the IX pump.

We also found that if feed one pump into another (series), the flow only drops slightly through the pressure range. The first pump is feeding the second pump and the second pump doesn't have to work as hard.

The best choice was the twin Walbro 255lph HP external pumps in parallel, meaning both pumps feeding the regulator.

The twin Walbro 255lph HP in-tank pumps in parallel was interesting. If you notice the flow starts dropping off at higher pressures and actually starts to get close to the performance of just one 255lph HP external pump over 90psi. The in-tank 255lph HP Walbro pumps have a pressure relief valve that starts to dump flow at roughly 85psi and the output flow drops.

Next up are the OEM Subaru fuel pumps, we'll post results as soon as we have them!

Thank you

Rich K
Marketing Director
AutoMotoSports Inc. (AMS)
Tel:847-709-0530
www.amsperformance.com
Rich@amsperformance.com
AIM: RICHatAMS

* Registered users of the site do not see these ads.

djerickd · 04-07-2007, 07:03 AM

Thanks Chewy!!

Unabomber · 04-08-2007, 11:27 PM

Nice testing! I'll give you $1 if you email Buscher Racing and see if they will send you one of their set-ups. David Buscher is NOT skeerd, and I'd bet he'd want to be included in your testing with his set-up.

WRXINTX · 04-09-2007, 02:29 AM

wow.... with a great test rig like that ....

how about testing the -044 Bosch motorsport pump and -979 porsche pump.... and the MKiV Toyota Supra stock pump....

Awesome and conclusive results!!!

ME LIKE!!!!!

Thanks guys!

bubba03wrx · 04-09-2007, 03:23 AM

Quote:

Originally Posted by Unabomber

Nice testing! I'll give you $1 if you email Buscher Racing and see if they will send you one of their set-ups. David Buscher is NOT skeerd, and I'd bet he'd want to be included in your testing with his set-up.

intrested in his pump test as well

mccorry · 04-09-2007, 05:35 PM

:subscribe:

Martin@AMS · 04-10-2007, 12:00 PM

We have a digital flow meter on the way which will make testing 100 time quicker. I'll be able to test every 5psi of pressure and at different voltages.

seattle944t · 04-10-2007, 12:16 PM

Awesome info - great work! Looking forward to the stock Subaru pump results.

racer87 · 04-12-2007, 03:28 PM

Quote:

Originally Posted by bubba03wrx

intrested in his pump test as well

Quote:

Originally Posted by Unabomber

Nice testing! I'll give you $1 if you email Buscher Racing and see if they will send you one of their set-ups. David Buscher is NOT skeerd, and I'd bet he'd want to be included in your testing with his set-up.

Any comments on this AMS? I'd like to see this as well.

kaos200 · 04-12-2007, 04:18 PM

Very nice, can't wait to see the results. Keep up the great work guys!

SplatZ400 · 04-17-2007, 07:18 AM

any updates?

fastwrx25 · 04-17-2007, 09:30 AM

awesome data! subscribed

engineerx · 04-24-2007, 02:21 PM

It would be VERY interesting if you test the BOSCH 044 motorsports and modified Walbro Buschur fuel pump

I think those 2 pumps would of great interest to many people because of their reasonable price for the performance they claim to offer. (Bosch $210, modified Walbro $275?)

AMS · 04-24-2007, 02:27 PM

we actually have a bosch 044 here as well as a slew of subaru stock pumps. Martin has been at Autobahn and tuning the past few days to get ready for the GTlive event in utah coming up. Once we get past that Im sure we will jump back into the fuel pump test.

Eric

engineerx · 04-24-2007, 04:42 PM

^^^
Awesome!
Looking forward to test results......
Kinda reminds me of college-days lab classes.... test, collect data, use Excel (I remember using Lotus 1-2-3) to generate a nice chart

AMS: you're providing alot of people a great service by providing actual data we can use to make fuel-delivery decisions

Thank you!

AMS · 04-24-2007, 08:43 PM

Thank you, You can expect alot more like this to come from us. We LOOOVE to test

Eric

SplatZ400 · 05-14-2007, 11:36 AM

bump for some results, come on we are dying!

AMS · 05-16-2007, 03:43 PM

well we have a bunch of subaru pumps here, Bosch 044 and a weldon. Finding time with the race events we have been attending and the upcomming track day has proven to be a bit of a task in itself.

Martin@AMS · 05-18-2007, 08:37 PM

update on the test. Here is some more data and I split it up to make it easier to read hopefully. I ran some Bosch 044 pumps which work really well (external pumps). I ran an STi pump but lost the data and will have to re-run it.

Martin@AMS · 05-18-2007, 08:38 PM

From what I remember the STi pump was very similar to the EVO IX pump but we'll know in a few days. Also the Bosch 044 flows a bunch, especially at higher pressures.

jblaine · 05-18-2007, 11:13 PM

This thread kicks ass. Thanks again AMS!

engineerx · 05-19-2007, 07:38 AM

^^^
what he said!
Very useful test for a very important component of the fuel system!
No wonder why the Brits & Aussies like the 044 so much. (I got one myself)

cpturbo · 05-19-2007, 12:36 PM

An important variable to consider is that we must think about is how well these pumps work at around 13.3 volts which is where our cars seem to run. Will the modified Walbro run the same or will it require more power. I like how the 044 is stable across the pressure range, that it is unmodified as the factory intended, and that it is German (usually most stuff is overengineered). It should be enough. I am working with Davon on an intake kit. We will post the installation tips and results. It has been done before and we will improve upon that. Engineerx, Davon, and I have been working on this stuff for a month.

Approx 210 for the pump
Fittings 35
filter 65
The last pump you will ever need for most of us.

Stay tuned

Martin@AMS · 05-21-2007, 02:54 PM

The tests were done at 14V and the voltage was held constant with the power supply and amp draws were recorded. Checking my data shows that the modified walbro didn't really draw more amps than a stock one. I'm not sure what is done to the walbro, all I can tell from the outside is that the pressure relieve cup/spring is pushed in compared to a stock one.

SplatZ400 · 05-22-2007, 03:23 AM

Quote:

Originally Posted by Martin@AMS

The tests were done at 14V and the voltage was held constant with the power supply and amp draws were recorded. Checking my data shows that the modified walbro didn't really draw more amps than a stock one. I'm not sure what is done to the walbro, all I can tell from the outside is that the pressure relieve cup/spring is pushed in compared to a stock one.

Yes that is all that is done to them but hell it works and i wont complain. now if i could just get some solid directions on how to do it myself.

04-24-2007, 02:27 PM	#14
AMS NASIOC Vendor Vendor Sales Rating: (3) Member#: 27854 Join Date: Oct 2002 Chapter/Region: MWSOC Location: West Chicago, IL Vehicle: 2005 STi, 2007 STI 05 OBP, 07 OBP	we actually have a bosch 044 here as well as a slew of subaru stock pumps. Martin has been at Autobahn and tuning the past few days to get ready for the GTlive event in utah coming up. Once we get past that Im sure we will jump back into the fuel pump test. Eric __________________ *Simmon Olejniczak* -Sales- To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. Tel. 847-709-0530 World's QUICKEST EVO 8 - 8.42 with a best trap of 171 MPH World’s Most Powerful EVO – 1142 awhp 2008 AMS Racing – 40 Victories in Road Racing and Hill Climb To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

04-24-2007, 08:43 PM	#16
AMS NASIOC Vendor Vendor Sales Rating: (3) Member#: 27854 Join Date: Oct 2002 Chapter/Region: MWSOC Location: West Chicago, IL Vehicle: 2005 STi, 2007 STI 05 OBP, 07 OBP	Thank you, You can expect alot more like this to come from us. We LOOOVE to test Eric __________________ *Simmon Olejniczak* -Sales- To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. Tel. 847-709-0530 World's QUICKEST EVO 8 - 8.42 with a best trap of 171 MPH World’s Most Powerful EVO – 1142 awhp 2008 AMS Racing – 40 Victories in Road Racing and Hill Climb To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

05-16-2007, 03:43 PM	#18
AMS NASIOC Vendor Vendor Sales Rating: (3) Member#: 27854 Join Date: Oct 2002 Chapter/Region: MWSOC Location: West Chicago, IL Vehicle: 2005 STi, 2007 STI 05 OBP, 07 OBP	well we have a bunch of subaru pumps here, Bosch 044 and a weldon. Finding time with the race events we have been attending and the upcomming track day has proven to be a bit of a task in itself. __________________ *Simmon Olejniczak* -Sales- To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. Tel. 847-709-0530 World's QUICKEST EVO 8 - 8.42 with a best trap of 171 MPH World’s Most Powerful EVO – 1142 awhp 2008 AMS Racing – 40 Victories in Road Racing and Hill Climb To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

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04-07-2007, 07:03 AM	#2
djerickd Scooby Guru Member Sales Rating: (34) Member#: 3782 Join Date: Jan 2001 Chapter/Region: South East Location: Tampa Btch! Vehicle:* 02 Old Skool WRX WFC #040 Still Flossin!!!	Thanks Chewy!!

04-08-2007, 11:27 PM	#3
Unabomber Amish Rake Fighting Moderator Member Sales Rating: (10) Member#: 18062 Join Date: Apr 2002 Chapter/Region: MAIC Location: This space right here Vehicle: is available for purchasing	Nice testing! I'll give you $1 if you email Buscher Racing and see if they will send you one of their set-ups. David Buscher is NOT skeerd, and I'd bet he'd want to be included in your testing with his set-up.

04-09-2007, 02:29 AM	#4
WRXINTX NASIOC Supporter Member Sales Rating: (52) Member#: 96712 Join Date: Sep 2005	wow.... with a great test rig like that .... how about testing the -044 Bosch motorsport pump and -979 porsche pump.... and the MKiV Toyota Supra stock pump.... Awesome and conclusive results!!! ME LIKE!!!!! Thanks guys!

04-09-2007, 05:35 PM	#6
mccorry Scooby Newbie Member Sales Rating: (0) Member#: 66559 Join Date: Jul 2004 Location: Ohio Vehicle: 2005 Legacy GT Lmtd. Regal Blue Pearl	:subscribe:

04-10-2007, 12:00 PM	#7
Martin@AMS Scooby Newbie Member Sales Rating: (0) Member#: 136023 Join Date: Dec 2006 Location: Mount Prospect, IL Vehicle: 2005 STi Silver	We have a digital flow meter on the way which will make testing 100 time quicker. I'll be able to test every 5psi of pressure and at different voltages.

04-10-2007, 12:16 PM	#8
seattle944t Scooby Specialist Member Sales Rating: (3) Member#: 18308 Join Date: May 2002 Chapter/Region: NWIC Location: Seattle, WA Vehicle: 2005 WRX STi Silver	Awesome info - great work! Looking forward to the stock Subaru pump results.

04-12-2007, 04:18 PM	#10
kaos200 Scooby Specialist Member Sales Rating: (26) Member#: 2692 Join Date: Oct 2000 Chapter/Region: SCIC Location: SoCal	Very nice, can't wait to see the results. Keep up the great work guys!

04-17-2007, 07:18 AM	#11
SplatZ400 Scooby Specialist Member Sales Rating: (70) Member#: 84377 Join Date: Apr 2005 Chapter/Region: South East Location: Miami, FL Vehicle: 2008 Lexus IS-F Obsidian Black	any updates?

04-17-2007, 09:30 AM	#12
fastwrx25 Scooby Specialist Member Sales Rating: (28) Member#: 126441 Join Date: Sep 2006 Chapter/Region: SCIC Location: california Vehicle: 02 bugeye	awesome data! subscribed

04-24-2007, 02:21 PM	#13
engineerx Scooby Specialist Member Sales Rating: (32) Member#: 42614 Join Date: Sep 2003 Chapter/Region: SCIC Location: Bullet-Dodging Fwy Los Angeles Vehicle: 0405 WRX STi/S2000 AspenWhite/Silverstone	It would be VERY interesting if you test the BOSCH 044 motorsports and modified Walbro Buschur fuel pump I think those 2 pumps would of great interest to many people because of their reasonable price for the performance they claim to offer. (Bosch $210, modified Walbro $275?)

04-24-2007, 04:42 PM	#15
engineerx Scooby Specialist Member Sales Rating: (32) Member#: 42614 Join Date: Sep 2003 Chapter/Region: SCIC Location: Bullet-Dodging Fwy Los Angeles Vehicle: 0405 WRX STi/S2000 AspenWhite/Silverstone	^^^ Awesome! Looking forward to test results...... Kinda reminds me of college-days lab classes.... test, collect data, use Excel (I remember using Lotus 1-2-3) to generate a nice chart AMS: you're providing alot of people a great service by providing actual data we can use to make fuel-delivery decisions Thank you!

05-14-2007, 11:36 AM	#17
SplatZ400 Scooby Specialist Member Sales Rating: (70) Member#: 84377 Join Date: Apr 2005 Chapter/Region: South East Location: Miami, FL Vehicle: 2008 Lexus IS-F Obsidian Black	bump for some results, come on we are dying!

05-18-2007, 08:37 PM	#19
Martin@AMS Scooby Newbie Member Sales Rating: (0) Member#: 136023 Join Date: Dec 2006 Location: Mount Prospect, IL Vehicle: 2005 STi Silver	update on the test. Here is some more data and I split it up to make it easier to read hopefully. I ran some Bosch 044 pumps which work really well (external pumps). I ran an STi pump but lost the data and will have to re-run it.

05-18-2007, 08:38 PM	#20
Martin@AMS Scooby Newbie Member Sales Rating: (0) Member#: 136023 Join Date: Dec 2006 Location: Mount Prospect, IL Vehicle: 2005 STi Silver	From what I remember the STi pump was very similar to the EVO IX pump but we'll know in a few days. Also the Bosch 044 flows a bunch, especially at higher pressures.

05-18-2007, 11:13 PM	#21
jblaine NASIOC Supporter Member Sales Rating: (35) Member#: 8512 Join Date: Jul 2001 Chapter/Region: South East Location: St. Pete, FL Vehicle: 2002 WRX chassis... stage-infinity.com	This thread kicks ass. Thanks again AMS!

05-19-2007, 07:38 AM	#22
engineerx Scooby Specialist Member Sales Rating: (32) Member#: 42614 Join Date: Sep 2003 Chapter/Region: SCIC Location: Bullet-Dodging Fwy Los Angeles Vehicle: 0405 WRX STi/S2000 AspenWhite/Silverstone	^^^ what he said! Very useful test for a very important component of the fuel system! No wonder why the Brits & Aussies like the 044 so much. (I got one myself)

05-19-2007, 12:36 PM	#23
cpturbo Scooby Newbie Member Sales Rating: (15) Member#: 49175 Join Date: Nov 2003 Vehicle: 2004 STI WRB	An important variable to consider is that we must think about is how well these pumps work at around 13.3 volts which is where our cars seem to run. Will the modified Walbro run the same or will it require more power. I like how the 044 is stable across the pressure range, that it is unmodified as the factory intended, and that it is German (usually most stuff is overengineered). It should be enough. I am working with Davon on an intake kit. We will post the installation tips and results. It has been done before and we will improve upon that. Engineerx, Davon, and I have been working on this stuff for a month. Approx 210 for the pump Fittings 35 filter 65 The last pump you will ever need for most of us. Stay tuned

05-21-2007, 02:54 PM	#24
Martin@AMS Scooby Newbie Member Sales Rating: (0) Member#: 136023 Join Date: Dec 2006 Location: Mount Prospect, IL Vehicle: 2005 STi Silver	The tests were done at 14V and the voltage was held constant with the power supply and amp draws were recorded. Checking my data shows that the modified walbro didn't really draw more amps than a stock one. I'm not sure what is done to the walbro, all I can tell from the outside is that the pressure relieve cup/spring is pushed in compared to a stock one.