I'm wondering if a single Walbro 400lph in-tank can replace my current Walbro 255 in-tank/Bosch 044 inline setup?

The Bosch is loud as heck, and I would love to simplify the 2 pumps, 2 filters configuration. I used to run e85 in the summertime, but I won't be doing that anymore. Just straight pump gas for me from now on.

Pump gas HP target is high 300's on stock lines.

Any thoughts? Thanks.

 

If you are running on pump gas you don't even need the inline Bosch. An in-tank Walbro 255lph is plenty for 400hp on stock lines. I'd just remove the Bosch.

 

^ agreed just ditch the 044 the 255 will b plenty.

 

i am making 480 on 93 with just a 255.

 

93 doesn't require as much pump/injector as E85, keep that in mind OP. A lot of people forget that at times.

The 255 lp should be fine.

Directly from the website.

http://walbrofuelpumps.com/1988-1991...-cyl-1-5l.html

 

Thanks for the replies guys!

Also, I have been looking for a place to post a link to the most awesome inline fuel filters I have ever come across for e85, and this seems as good a spot as any. After a lot of research into e85 filters, these stood out to me even over name brand options, and I'm glad I got one.

http://www.robbmcperformance.com/products/filters.html

I have no business affiliation with this guy whatsoever, I just wanted to pass this along as I haven't see anyone else here on honda-tech post about these (there is no way I'm the first to use one?). I have been using this filter with e85 and pump gas for a few years, and I must say I am impressed. The element is not paper, so it can withstand any chemical you can run through it. It's made of like, copper or brass or something. The element is removeable/back-washable/replaceable, extras run $12. It is 100 micron, and has a high GPH rating which I needed for running e85. I use it pre fuel rail. The element catches everything, and while owning one, I had to replace the element once but will probably do it again this spring just cuz. They look home made on the site because they probably are, but when you actually get it to look at it it's a quality unit. His price on these is what also drew me in.

I just thought I would give back to honda-tech after all these years of taking. Maybe help someone out who is looking for a good E85 filter

 

255 hp is good for like 500-550 hp on big H motor on pump

 

he said he's getting rid of the e85 and just doing pump gas so i left the e85 part out.

 

i made 560 on e85 with ID1000's, stock lines, and a walbro 400. the wally 400 flows ALOT for the price and size, it fits in the stock fuel hat, too, which is nice.

 

Go with the 400, it's the most silent pump

Just don't forget to upgrade the fuel pump wiring/relay/fuse for it

 

forgot to add, it is very quite. it's a kickass little pump

 

what were your duty cycle at? stock feed and return line?

 

Would like to know this as well

 

If the 044 was rigidly mounted then that's why it was loud... any pump is loud if rigidly mounted.

mount it with rubber between the body and clamps (or the bracket) and you'll never hear it. I mounted my A1000 in car on rubber feet and you can't hear it at all.

but yes all you need is a single 255

as far as filters i like xrp, they have paper or stainless steel high flow elements from 120 microns to 10 microns, plus you can stack multiple elements into one filter body for staged filtration without multiple filter housings. and they support differential pressure gauges between each filter element to monitor filter health and to see if one element is a restriction (or if your fuel quality really sucks)

 

100%. lol, it actually hit 100% at 7,800 rpm and i revved the motor to 8500-8600.

ran it like that for months before the trans blew out, again.


stock feed and return, i even had the stock fuel filter

 

Unfortunately, their "handles up to X!" doesn't show what BSFC they used to calculate that. Fuel required for turbo is a LOT different than fuel required for NA. We're talking about a 15% difference just between turbo and naturally aspirated. On top of that, for all we know, the used an unnaturally low BSFC just to be able to throw out a bigger number - every company does it.

(Innocent self-plug): OP, you may want to give this thread a good read.

 

The bsfc numbers have actually dropped lately... given the advancement in engine technology, engine management technology, and better fuels.

most consider the bsfc for a modern, ohc, 4 valve turbocharged and intercooled motor (as well as the new turbo diesels) to be between .42-.48

Supercharged motors have a higher bsfc, around .55 due to the parasitic losses from driving the supercharger. this number is also accepted for modern non intercooled turbo motors.

older engine tech such as pushrod v8s and 2 valve heads are in the .60-.65 range.

however it never hurts to use a higher than needed bsfc when doing fuel system calculations so you have a decent amount of overhead and safety margin.

 

A single 255 is more than enough. I made 560whp with a single 255, pte1000s, and e85.

But if youre looking for more info on the 450. Heres a thread...

https://honda-tech.com/forums/forced-induction-16/walbro-450lph-users-unite-3139056/

 

I'm curious, do you have a source for that? I've always been told that NA should go for .50, SC .55-.60, and TC .60-.65 for BSFC. It seems counterintuitive that NA would go down just a smidge, TC would go down a LOT, and SC wouldn't move at all.