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Old 07-07-2010, 08:57 PM   #21
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An E46 M3 pump will "start" to lose fuel pressure at around 500rwhp depending on the boost level in the turbo. We run an inline pump to compensate and even with that, we start losing fuel pressure above 625rwhp with the OEM and Walbro inline. That's why we use methanol to make more than 625rwhp. With the walbro in tank and walbro in-line, we're not losing fuel pressure all the way past 625rwhp without methanol at that's at 23psi (73 static + 23psi boost = 96psi fuel pressure)

Chris.
Yeah I was talking 70psi total with boost 50psi base. So 96psi @ 500whp is about the same thing as 70psi @ 575whp.
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Old 09-11-2010, 02:06 PM   #22
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Any update on this new pump upgrade at all? Would really like to install it!
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Old 09-11-2010, 04:15 PM   #23
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in for updates, buying this asap.
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Old 09-11-2010, 05:01 PM   #24
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Old 09-12-2010, 11:16 AM   #25
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I think I know the answer...but will this drop into any non-SULEV E46?

Also, I thought the Walbro 255 pump is supposed to last a lot longer than the OEM M3 pump...which would make this a worthwhile upgrade over time.
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Old 09-12-2010, 05:51 PM   #26
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I think I know the answer...but will this drop into any non-SULEV E46?

Also, I thought the Walbro 255 pump is supposed to last a lot longer than the OEM M3 pump...which would make this a worthwhile upgrade over time.
The Walbro pump is smaller but flows more at higher pressures. We designed a sleeve for the pump to sit in that makes it dimensionally the same as the OEM pump. This allows it to fit directly in the hanger without any adjustments. We had them produced, but half way through we had to make a change, so we have half of them we're going to install in house, the 2nd half when we get them we're going to ship to customers that want them. All of the stage 2.5 cars that have left our shop in the past few months already have a Walbro in tank pump. We just didn't tell anyone that they got the upgrade. Once I get the new version, I'll post up pictures and start selling them.

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Old 09-12-2010, 06:23 PM   #27
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The Walbro pump is smaller but flows more at higher pressures. We designed a sleeve for the pump to sit in that makes it dimensionally the same as the OEM pump. This allows it to fit directly in the hanger without any adjustments. We had them produced, but half way through we had to make a change, so we have half of them we're going to install in house, the 2nd half when we get them we're going to ship to customers that want them. All of the stage 2.5 cars that have left our shop in the past few months already have a Walbro in tank pump. We just didn't tell anyone that they got the upgrade. Once I get the new version, I'll post up pictures and start selling them.

Chris.
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Old 09-12-2010, 07:54 PM   #28
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Quote:
Originally Posted by HPF Chris View Post
The Walbro pump is smaller but flows more at higher pressures. We designed a sleeve for the pump to sit in that makes it dimensionally the same as the OEM pump. This allows it to fit directly in the hanger without any adjustments. We had them produced, but half way through we had to make a change, so we have half of them we're going to install in house, the 2nd half when we get them we're going to ship to customers that want them. All of the stage 2.5 cars that have left our shop in the past few months already have a Walbro in tank pump. We just didn't tell anyone that they got the upgrade. Once I get the new version, I'll post up pictures and start selling them.

Chris.
Cool. Since the M3 pump drops in to non-Ms...I would assume this would drop in as well?

A lot of Fi'd non-M's should be interested in this.
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Old 09-12-2010, 10:09 PM   #29
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walbro 255s suck please put in bosch 044s.... I cannot believe you guys claim 1000hp with your stage 4 kit and you only put a inline pump? You would need upgraded to at least -12 -10 lines after 650whp you mean to tell me it is possible to make 1000hp on a stock fuel rail to? what a joke i run a aeromotive a1000 pump and im only at 600awhp...
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Old 09-12-2010, 10:11 PM   #30
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walbro 255s suck please put in bosch 044s.... I cannot believe you guys claim 1000hp with your stage 4 kit and you only put a inline pump? You would need upgraded to at least -12 -10 lines after 650whp you mean to tell me it is possible to make 1000hp on a stock fuel rail to? what a joke i run a aeromotive a1000 pump and im only at 600awhp...
Stage 4 has 3 pumps in addition to methanol and have larger fuel lines and rail.

You sir fail at trolling. Go play with your audi.
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Old 09-12-2010, 10:14 PM   #31
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ok on stock lines? lmao
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Old 09-12-2010, 10:14 PM   #32
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Quote:
Originally Posted by gt2876rs4 View Post
walbro 255s suck please put in bosch 044s.... I cannot believe you guys claim 1000hp with your stage 4 kit and you only put a inline pump? You would need upgraded to at least -12 -10 lines after 650whp you mean to tell me it is possible to make 1000hp on a stock fuel rail to? what a joke i run a aeromotive a1000 pump and im only at 600awhp...
I'm running a Bosch 044 in tank

Next time, before you open your mouth to talk so much ****, research just a little bit
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Old 09-12-2010, 10:17 PM   #33
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I'm running a Bosch 044 in tank

Next time, before you open your mouth to talk so much ****, research just a little bit
on stock lines? and rails?
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Old 09-12-2010, 10:17 PM   #34
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walbro 255s suck please put in bosch 044s.... I cannot believe you guys claim 1000hp with your stage 4 kit and you only put a inline pump? You would need upgraded to at least -12 -10 lines after 650whp you mean to tell me it is possible to make 1000hp on a stock fuel rail to? what a joke i run a aeromotive a1000 pump and im only at 600awhp...
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Old 09-12-2010, 10:22 PM   #35
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ok on stock lines? lmao
You sir are a moron.

Quote:
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Stage 4 has 3 pumps in addition to methanol and have larger fuel lines and rail.

You sir fail at trolling. Go play with your audi.
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Old 09-12-2010, 10:37 PM   #36
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on stock lines? and rails?
Hey troll. Stage 3 and 4 use larger lines and custom rail..
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Old 09-13-2010, 12:44 AM   #37
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Since the M3 pump drops in to non-Ms...I would assume this would drop in as well?

A lot of Fi'd non-M's should be interested in this.
Anyone?
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Old 09-13-2010, 01:18 PM   #38
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Hey troll. Stage 3 and 4 use larger lines and custom rail..
OK I understand that i still cant believe that stage 2 and 2.5 do-not use those components. They are needed after 600-650whp.. soooo
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Old 09-13-2010, 01:28 PM   #39
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OK I understand that i still cant believe that stage 2 and 2.5 do-not use those components. They are needed after 600-650whp.. soooo
Our fuel system comes in stages. Stage 1, 2, 2.5 run two fuel pumps. The OEM pump and an inline Walbro 255. This was designed to be sufficient at 625rwhp. As we added little features, some cars wound up above 650rwhp and some even close to 700rwhp. Fuel pressure is better on high compression engines where they are running less boost (13psi) and are more efficient (stage 1-2), but on the lower compression built motors (the stage 2.5s) running more boost, they need a bit more fuel and we noticed the OEM pump on older cars tends to suffer a bit. The fuel maps in the 2.5's were modified to compensate for this fuel pressure drop by leaving the injectors open longer at the top. This is a bandaid fix to keeping the fuel pressure adequate. After testing several pumps including the Bosch 040 and the 044 and the Walbro in tank pump and multiple varieties of each, we found the in tank Walbro 255 (paired with the in-line Walbro 255) to be the only one that could hold pressure at peak boost in a 2.5. Remember, this isn't like your ordinary low impedance injector car. These are running high impedance injectors with a static fuel pressure of 73psi. At 23psi of boost, the fuel pressure required is 96psi!!! Not many pumps can flow 700rwhp at 96psi. So with this change, our existing 2.5's will run a little richer up top which is safer. If they run too rich after this fuel pump upgrade, we can give them the new map for the new walbro pump. You always want your car to be capable of more fuel pressure than you need. That way as pumps age, and on extremely cold days when the fuel demands are greater, your car will stay in the safe zone.

Chris.

Last edited by HPF Chris; 09-13-2010 at 01:29 PM.
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Old 09-14-2010, 02:24 AM   #40
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This sounds like a great part. im gona get this along with the oil cooler soon
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