Dual Walbro 450s with stock bucket COMPLETE - LS1TECH



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Dual Walbro 450s with stock bucket COMPLETE

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Old 05-10-2014, 06:50 AM   #1
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Default Dual Walbro 450s with stock bucket COMPLETE

I searched high and low on how to make these pumps work on an Fbody (2001) or if it was even possible with the factory tank and factory hanger/bucket and had no luck. So I took it upon myself to make a thread to show it's possible/doable to get these to fit with small modifications and a lot of patience. The hardest part was fitting the socks into the tank as the plastic part holding the sock on to the pump has almost no give or flex to it. Pair that with the bottoms of the 450's being wide at the bottom, and you're in for a hell of a fight to get it into the tank, but its 100% doable.

I wired them so they both run at the same time, no hobbs switch. And I ended up moving the relays into the spare tire well since I decided to relocate my battery as well. Here are a few pics I took along the way.















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Old 05-10-2014, 07:13 AM   #2
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Looks great man
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Old 05-10-2014, 07:45 AM   #3
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Whew! Thanks man, I'm sure someone will find something wrong with it or could be done better which is what I like about these threads. It's First time doing something like this, I'm usually the person reading the write ups and trying what's known and proven to work! The other solution to make these fit was a $700 setup from a sponsor on here thats drop in and go, but I ordered these pumps and THEN saw that there was a drop in solution. Regardless, I saved $400 give or take.
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Old 05-10-2014, 08:54 AM   #4
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What is one of those 450's been proven to? I know people were getting right around 550whp on a 255 Walbro, give or take depending on setup. Is there a "right around" number that people seem to be hitting the limit with on one of these?
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Old 05-10-2014, 09:02 AM   #5
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What y fitting did you use to connect them together?
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Old 05-10-2014, 11:15 AM   #6
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What is one of those 450's been proven to? I know people were getting right around 550whp on a 255 Walbro, give or take depending on setup. Is there a "right around" number that people seem to be hitting the limit with on one of these?

Guy with a z06 made right at 700rwhp with e85 and a small shot.

Figure on pump gas they would support a bit more even boosted.
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Old 05-10-2014, 05:41 PM   #7
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Could you please post a parts list for all the stuff you used for the conversion? Im also looking at the squash dual pumps, but $400 is a lot to save!
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Old 05-10-2014, 10:00 PM   #8
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What is one of those 450's been proven to? I know people were getting right around 550whp on a 255 Walbro, give or take depending on setup. Is there a "right around" number that people seem to be hitting the limit with on one of these?
Theoretically I should be able to make 1000-1100rw with 2000cc injectors on E85 with my single turbo setup. On pump gas they're probably good for 1400rw. I honestly don't know of anyone pushing the limits yet with this setup, once I start tuning I'll be able to get more specific and give a real answer.

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What y fitting did you use to connect them together?
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Could you please post a parts list for all the stuff you used for the conversion? Im also looking at the squash dual pumps, but $400 is a lot to save!
I should have free time monday to get a list together, I'm currently in a time crunch
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Old 05-11-2014, 04:22 AM   #9
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Would I be fine to run one 450 off just a hot wire kit with the factory setup or is just to much amps? and the second off my own relay and hobs switch.
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Old 05-11-2014, 06:18 AM   #10
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LOL! WOW! Look a me I guess I'm a pioneer at something LOL! Did this probably 2yrs ago in a T/A and theoreticly there is 1800hp worth of pump on reguar 93. Glad it worked out for you Rams. Yall did a great job with the limited information I gave you! Plus the guy who modified that bucket is a bad ***! LOL!
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Old 05-11-2014, 08:43 AM   #11
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Nice work. you have me contemplating 2 450s in mine now
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Old 05-12-2014, 01:38 PM   #12
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LOL! WOW! Look a me I guess I'm a pioneer at something LOL! Did this probably 2yrs ago in a T/A and theoreticly there is 1800hp worth of pump on reguar 93. Glad it worked out for you Rams. Yall did a great job with the limited information I gave you! Plus the guy who modified that bucket is a bad ***! LOL!
Thankfully me and you are on the same time schedule LOL! 4am text "hey how the **** do i do this?!" Thanks again for all of the help Jeff, I'll probably bother you again tonight on some stuff.


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Nice work. you have me contemplating 2 450s in mine now
You should, just gotta modify the bucket slightly and buy x2 Walbro 450lph pumps WITH the install kit on ebay. $130 each.
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Old 05-12-2014, 02:56 PM   #13
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Thankfully me and you are on the same time schedule LOL! 4am text "hey how the **** do i do this?!" Thanks again for all of the help Jeff, I'll probably bother you again tonight on some stuff.




You should, just gotta modify the bucket slightly and buy x2 Walbro 450lph pumps WITH the install kit on ebay. $130 each.
Now i guess that my question is will you still have to keep the fuel level up in the tank? that bucket isn't going to hold any fuel now that it's cut open like that so doesn't it defeat the purpose? Mine wont be a daily driver so i dont really care that much but if it was then it would probably be a problem
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Old 05-12-2014, 03:46 PM   #14
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People have been running dual 450s on the truck side for a while now. I know Foose04 ran them to near 1000 rwhp.

A single 450 on E85 was done at 12 psi on my 6.0. Dyno'd 542 @ 8 psi. I've had dual 450s in my stock 99-02 truck bucket (same as fbody afaik) with no issues. I really like how you took minimal amount of the bucket out. Regardless, the bucket does have to be cut.
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Old 05-13-2014, 01:00 AM   #15
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Can you add pics of the y you use to use ? Were you find all the component you used? Thanks
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Old 05-13-2014, 03:14 AM   #16
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I maxed out 2 x 450s in a surge tank at 1150rwhp thru a 4200 stalled t400 auto on pump e85!!!!
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Old 05-13-2014, 08:13 AM   #17
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Old 05-13-2014, 10:06 AM   #18
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Any luck getting the parts list together? I'm almost definitely doing the same set-up
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Old 05-13-2014, 07:33 PM   #19
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Based on some calculations I have made...
Dual 450's should be maxed out around 1150 (about 1180) rwhp on e85.
Dual 465's (same physical size as the 450) should be enough to flow over 1300 (close to 1320) rwhp on e85.

This of course requires a large enough injector to run a low base fuel pressure to get the most out of the pump... My calculations are assuming you start at a base pressure of 43 psi and run 22 psi of boost.

*Results may vary.

Last edited by Slow94Formula; 05-13-2014 at 08:05 PM.
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Old 05-15-2014, 05:48 PM   #20
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Bend pak for DA madafakin win!!
Best piece of equipment I've ever owned. Don'tknow what i would do without it now
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