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Old 05-25-2017, 08:15 AM   #1
VB242
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Default Walbro or Deatschworks?

I'm looking to upgrade my fuel system after a trip to the dyno indicates I'm running out of fuel. Should I stick with the tried and true walboro 255 or something from the DW catalog? I'm not trying to reinvent the wheel, I'll be attempting to braze a larger nipple or AN fitting onto a stock fuel rail. The car has k-jet piping which appears to be 8mm up to the fuel filter. I'll just bypass the k-jet pump and use an 8mm line to the rail from the 740T filter. Anyone know for sure the size of a stock filter outlet, I'm thinking it's 12-14mm?I don't plan on running E-85 anytime soon, so I'm thinking 8mm all the way through will give me enough volume on pump gas.
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Old 05-25-2017, 08:56 AM   #2
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if no plans for e85, I'm sure you can get a walbro cheap. I've got a walbro 255 in my buick and its made 450whp on pump gas but doesn't have much room left on that pump. Dw301 in my s10 since its on e85 and I wanted to have plenty of overhead with it,
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Old 05-29-2017, 11:35 PM   #3
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Walbro 450, quieter than a 255 and better built. Cheep and will always be up to you needs. Never will you need a upgrade
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Old 05-30-2017, 01:21 AM   #4
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Quote:
Originally Posted by 2fast242gt View Post
Walbro 450, quieter than a 255 and better built. Cheep and will always be up to you needs. Never will you need a upgrade
This
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Old 05-30-2017, 10:34 AM   #5
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I run a DW301 on my Evo specifically to avoid the whine of the Walbro. Have no issues with fuel.

I can check the size of the filter sock when I get home. I have a new one waiting to swap in (stock 93 245 in tank obv)
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Old 05-30-2017, 10:49 AM   #6
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Have a DW200 in my n/a grey car and a DW300 in my red wagon. I've been happy with them. I like that you can purchase directly from Deatschworks so you know you're getting the real deal.

EDIT://
On my grey car, I recently replaced the sending unit and rewired the intake pump as I have deleted the main pump under the rear siders side. I drilled out the feed and return ports and ran 6an bulk head fittings with 6an hose from the sending unit to the OEM filter which on my '90 is under the rear driver side next to where the main fuel pump is. Of course I didn't really take any pictures
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Old 05-30-2017, 10:57 AM   #7
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Here's a picture of the sending unit.

WP_20170513_002
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Old 05-30-2017, 11:03 AM   #8
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I
Quote:
Originally Posted by Marvelous3 View Post
Here's a picture of the sending unit.

WP_20170513_002
Nice this what I've been envisioning with the larger pump, I'm going to try brazing a -6 fitting onto a stock fuel rail and run 3/8 line back to front. Or pony up for a nuke fuel rail. If I only run 3/8 supply will it overwhelm my 5/16" return through my kirban adjustable FPR and raise the pressure too much?
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Old 05-30-2017, 11:21 AM   #9
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I run a dw200 on my 940 turbo....Precision 5531 660cc injectors and I'm definitely not running out of fuel at 25psi! The dw is super quite compared to a walbro 255. The dw is actually quieter than my stock pump was!!! Have only had it for about 4 months so time will tell about the quality.
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Old 05-30-2017, 11:34 AM   #10
Marvelous3
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Quote:
Originally Posted by VB242 View Post
I

Nice this what I've been envisioning with the larger pump, I'm going to try brazing a -6 fitting onto a stock fuel rail and run 3/8 line back to front. Or pony up for a nuke fuel rail. If I only run 3/8 supply will it overwhelm my 5/16" return through my kirban adjustable FPR and raise the pressure too much?
I don't know for sure but I wouldn't think so.
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Old 06-04-2017, 03:51 PM   #11
2fast242gt
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I have a dw in my other car, the 450 walbro is just as quiet, the 255's are loud as hell
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Old 06-04-2017, 08:01 PM   #12
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Quote:
Originally Posted by Marvelous3 View Post
Here's a picture of the sending unit.

WP_20170513_002
This looks good may look to go this route also.
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Old 06-05-2017, 11:20 AM   #13
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Quote:
Originally Posted by Marvelous3 View Post
Have a DW200 in my n/a grey car and a DW300 in my red wagon. I've been happy with them. I like that you can purchase directly from Deatschworks so you know you're getting the real deal.

EDIT://
On my grey car, I recently replaced the sending unit and rewired the intake pump as I have deleted the main pump under the rear siders side. I drilled out the feed and return ports and ran 6an bulk head fittings with 6an hose from the sending unit to the OEM filter which on my '90 is under the rear driver side next to where the main fuel pump is. Of course I didn't really take any pictures

Was it just a universal fit pump you used?
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Old 06-06-2017, 09:16 AM   #14
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Was it just a universal fit pump you used?
The DW200 pump in the pictures above is one of their universal fit ones, yes.

DW has changed their website around and now it won't allow me to pick a universal pump to purchase. It wants a make and model which of course Volvo isn't one of the choices. That's obnoxious.

Oh, on the model year if you go all the way to the bottom there is a "0" choice which then gives you a universal option to purchase. That's less than intuitive website design.

Anyways, it's this one:
http://deatschwerks.rpmware.com/deat.../i-527436.aspx
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Old 06-06-2017, 09:53 AM   #15
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Thanks for the info
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Old 03-15-2018, 11:22 PM   #16
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Does anyone have a pic of the hanger with the Walbro 450 mounted on it?

Thanks
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Old 03-16-2018, 12:14 AM   #17
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Check my build thread.

http://forums.turbobricks.com/showpo...&postcount=396
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Old 03-16-2018, 03:54 AM   #18
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I'd dare say all you suffering with loud 255's possibly bought fakes, I can't hear mine at all in my 945.
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Old 03-16-2018, 08:11 AM   #19
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Thank you, Sir.
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Old 03-16-2018, 10:13 AM   #20
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Is that Walbro 450 a gearotor instead of roots style pump?


Answering my own question.

The 255 pumps I am familiar with I have never disassembled, are gearotor.

The 450 pump is a twin turbine pump is quieter and more thermally stable.

Last edited by Dirty Rick; 03-16-2018 at 11:50 AM..
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Old 03-16-2018, 03:23 PM   #21
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I could barely hear the whine from either of my Walbro's, AEM 320 in the wagon now is just a touch quieter, enough I can't hear unless I REALLY try and listen for it.
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Old 03-16-2018, 03:30 PM   #22
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I was really nervous about the 450 I put in being too loud based on the reputation of other Walbro pumps, but was pleasantly surprised. It's just as quiet as the DW 300 I had in before. The 450 is a great pump, I only hear it when priming, can't hear it at all when the car is running.
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Old 03-17-2018, 04:40 PM   #23
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Quote:
Originally Posted by VB242 View Post
I'm looking to upgrade my fuel system after a trip to the dyno indicates I'm running out of fuel. Should I stick with the tried and true walboro 255 or something from the DW catalog? I'm not trying to reinvent the wheel, I'll be attempting to braze a larger nipple or AN fitting onto a stock fuel rail. The car has k-jet piping which appears to be 8mm up to the fuel filter. I'll just bypass the k-jet pump and use an 8mm line to the rail from the 740T filter. Anyone know for sure the size of a stock filter outlet, I'm thinking it's 12-14mm?I don't plan on running E-85 anytime soon, so I'm thinking 8mm all the way through will give me enough volume on pump gas.
What size injectors, what base fuel pressure, how much boost, and how much power are you aming at?

The k-jet -909 and -957 pumps are close to 180lph up to about 7.5bar (108psi) total pressure. That is pretty good. The original fuel rail and lines are really capable too.

I was running a walbro 255hp pump with my b21, with deka 60's, a 55psi fpr (that dodge thing) and 32psi boost on top of that. I was running out of fuel already before 350whp. Just because the total pressure was too high. At 87psi the walbro only pumps out 160lph. That's 2,67 litres a minute, and my injectors (708cc @ 55 psi) needed 2,83l/min.. In the datalogs the dutycycle would be off the chart, but not because the injectors were too small, but because the fuel pressure was dropping and forcing the injectors to open for longer periods of time to deliver enough fuel. So I switched to the "new" dw300 pump which is rated at ~220lph@90psi.

Choosing the right pump is not as easy as just looking at flow @ 3bar on a turbo car.
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Old 03-17-2018, 09:05 PM   #24
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Walbro 450 as stated above is the only intank to get. Ever
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Old 03-18-2018, 11:56 AM   #25
VB242
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Quote:
Originally Posted by eabras View Post
What size injectors, what base fuel pressure, how much boost, and how much power are you aming at?

The k-jet -909 and -957 pumps are close to 180lph up to about 7.5bar (108psi) total pressure. That is pretty good. The original fuel rail and lines are really capable too.

I was running a walbro 255hp pump with my b21, with deka 60's, a 55psi fpr (that dodge thing) and 32psi boost on top of that. I was running out of fuel already before 350whp. Just because the total pressure was too high. At 87psi the walbro only pumps out 160lph. That's 2,67 litres a minute, and my injectors (708cc @ 55 psi) needed 2,83l/min.. In the datalogs the dutycycle would be off the chart, but not because the injectors were too small, but because the fuel pressure was dropping and forcing the injectors to open for longer periods of time to deliver enough fuel. So I switched to the "new" dw300 pump which is rated at ~220lph@90psi.

Choosing the right pump is not as easy as just looking at flow @ 3bar on a turbo car.
K-jet pumps= good, airtex in tank pump is a bottleneck, which I'm still running even though I now have dw300 my garage. I think I'm going to run all new 3/8" hard lines under the car and an eBay fuel rail with all 3/8" rubber lines.
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