<![CDATA[limits of walbro 255 pump, 600hp]]>I beleive, after just a few days of playing, i found the limit of my single walbro 255 fuel pump. I figured out how to log delivered flywheel torque into the trans, whick only works in direct with the converter locked, and can therefore calcullate horsepower from it, just like a dyno does. so, off i went. with some tuning to get things running ok, low timing, and not very stable boost pressures, i managed to get a decent log in 3rd gear. Well long story short, i am seeing a long line of 500+ hp and quite a few in the 550+ range. even had a couple over 600, with the highest of 628hp, but im not sure if that was in drive, so i wont count it.
Right now im sitting at a solid 550 crank hp, that is at about 8psi, and 5600rpm. The car starts to break up and go lean at that point, but the numbers are jumping anywhere from 30-50hp per 400 rpm increase depending on boost, when i let out of it. And my cam is good to about 6600rpm, soooo, i dont think 600whp is out of the question if i can get some more fuel in it.
Example, 8psi
RPM, 3600, 4000, 4400, 4800, 5200, 5600, 6000
HP, 394, 412, 454, 517, 543, 584, 593
That is an actual log, discredit it as you will, but i feel it is fairly accurate, as this formula has been dyno dested to be within 3-4%. Also makes perfect sense because that is all a walbro 255 is capable of.
Discuss, oh, and sorry about no pics, im working on it
Gary

]]>https://fargostreet.com/topic/10335/limits-of-walbro-255-pump-600hpRSS for NodeThu, 28 May 2026 08:02:32 GMTWed, 25 Apr 2007 04:22:54 GMT60<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 21:56:21 GMT]]>

PSI2HI;166407 wrote:
I can sit online all day and read about rocket science, but can i physically do it/operate it, HELL NO!!

Reading comprehension is your friend.

]]>https://fargostreet.com/post/156231https://fargostreet.com/post/156231Thu, 26 Apr 2007 21:56:21 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 21:11:14 GMT]]>I am not attatcking anyone or defending anyone here, I am just pointing out that you dont have to know everything in the world if you reasearch what other people have done, had success with, and apply it to your own situation. I am not talking about gsr, chuck, dave, matt or anyone... just a general statement. If you are hell bent on doing r&d on everything yourself its going to be a spendy project. You have to research and learn from other people's mistakes if you are going to accomplish anything in this world.

having said that^ I agree with a lot of what everyone else is saying about first hand experience and how beneficial it is to understanding something but you have to start somewhere, and more often then not you read how deep the pool is before diving in head first.

]]>https://fargostreet.com/post/156225https://fargostreet.com/post/156225Thu, 26 Apr 2007 21:11:14 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 20:57:45 GMT]]>It's just beyond me that people comment about what everyones doing wrong that haven't done ANYTHING themselves. It's like me walking into Kevins shop and telling him he's buffing that car all wrong when i've never done it and have no clue.

]]>https://fargostreet.com/post/156224https://fargostreet.com/post/156224Thu, 26 Apr 2007 20:57:45 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 20:52:48 GMT]]>

GarageAlchemist;166410 wrote:
so when you build at a fast car then all the stuff you read about fast cars and how to build them then comes true?

You learn what works, what doesn't work and how things operate, if you haven't done it, how do you know?

Like Joel commentinmg GSR's slicks are to small and his suspension setup is all wrong, he needs traction bars, has anyone here tried and trued these facts to know, or have they read it?

Once everyone has done it they'll realize its not bolt on parts and you automatically go fast.

]]>https://fargostreet.com/post/156221https://fargostreet.com/post/156221Thu, 26 Apr 2007 20:52:48 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 20:51:21 GMT]]>to be fair, anyone can read on honda tech what other people have done to go 11.2 in a quarter and throw so much money at their own car that it is has no choice but be fast, right?

]]>https://fargostreet.com/post/156220https://fargostreet.com/post/156220Thu, 26 Apr 2007 20:51:21 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 20:47:52 GMT]]>so when you build at a fast car then all the stuff you read about fast cars and how to build them then comes true?

]]>https://fargostreet.com/post/156218https://fargostreet.com/post/156218Thu, 26 Apr 2007 20:47:52 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 20:29:43 GMT]]>

treimche;166396 wrote:
Just read Honda Tech, they have the answers to everything. Actually I'm gonna go read HT tonight so that I can build a 9 second street legal Honduh too.

Exactly the problem here, most talking have only read not actually built. If you physically haven't built anything how do you have the knowledge?

I can sit online all day and read about rocket science, but can i physically do it/operate it, HELL NO!!

]]>https://fargostreet.com/post/156215https://fargostreet.com/post/156215Thu, 26 Apr 2007 20:29:43 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 19:15:04 GMT]]>

treimche;166396 wrote:
Just read Honda Tech, they have the answers to everything. Actually I'm gonna go read HT tonight so that I can build a 9 second street legal Honduh too.

QFT!!!

]]>https://fargostreet.com/post/156205https://fargostreet.com/post/156205Thu, 26 Apr 2007 19:15:04 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 19:08:25 GMT]]>Just read Honda Tech, they have the answers to everything. Actually I'm gonna go read HT tonight so that I can build a 9 second street legal Honduh too.

]]>https://fargostreet.com/post/156204https://fargostreet.com/post/156204Thu, 26 Apr 2007 19:08:25 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 16:03:36 GMT]]>I think they were stating opinions, not facts and certainly no one is going to deny that you have a very fast car, just that they think they may have ideas on how to be faster. Then again, you are like me in this GSR, we have both researched our cars limitations, consulted with people that know more than both of us on these subjects, and then built our cars based on how we want it to perform, and I understand the frustration you are experiencing with people saying "You should have done this/that", but really, who cares? Your times will be faster than theirs (most likely)...doesn't mean others still won't have an opinion that to you or I may seem far off in left field.

]]>https://fargostreet.com/post/156171https://fargostreet.com/post/156171Thu, 26 Apr 2007 16:03:36 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 14:14:33 GMT]]>And this coming from people who have no clue again.

  1. 25x8x13 = plenty large.

Slick size plays a balance in gearing as well. I have contemplated a 24.5x9x13 this year, but I think I will be running a 25x8.7x13 this year.

  1. JIC FLT-A2 with CUSTOM SPRING RATES

Suspension setup in my vehicle = top notch. Added camber kits and it will be corner scaled and aligned this year.

  1. Traction Bars stop wheel hop, not make 500+ whp hook up.

Still don't have them, don't think I'll be ordering them any time soon, either.

]]>https://fargostreet.com/post/156161https://fargostreet.com/post/156161Thu, 26 Apr 2007 14:14:33 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 13:27:14 GMT]]>I think what matt is trying to point out is that there are several downfalls in GSR's setup(In his opinion) that would make him faster rather than putting a bigger turbo on it...
IMHO,(I'm a 15 second car guy myself so you better not listen to me!)

  1. The slicks are way too small
  2. You have JIC FLA-2's, thats pretty much road race suspension if i'm not mistaken...
  3. Traction bar?
]]>https://fargostreet.com/post/156156https://fargostreet.com/post/156156Thu, 26 Apr 2007 13:27:14 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 12:03:27 GMT]]>No, its all about the size of your e-penis

]]>https://fargostreet.com/post/156152https://fargostreet.com/post/156152Thu, 26 Apr 2007 12:03:27 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 08:51:29 GMT]]>

MisterCMK;166324 wrote:
See my sig. According to it, Gary has the biggest e-penis.

Grr 10
94NDTA 9
MisterCMK 6
tjamz 6
integra_gsr98 6
Turbo5Oh 4
KA-T_240 3
weshole 3
treimche 3
DaveH 3
DrifterExtreme 2
killer69penguin 2
dynotune 2
JN607 1
Seven1 1
krzydrftr93 1
bubba 1
Sweet-WRX-Lovin 1
Afsil80 1
KidSupreme 1
2wheeler 1
homie_hoges 1
torbs 1
97CL 1
24valvenotak 1
Ngige 1
MethodlesS 1
inspector01 1
SmitEvo 1

its not how big your e-penis is its how you use it.....in my case that doesnt apply......

]]>https://fargostreet.com/post/156146https://fargostreet.com/post/156146Thu, 26 Apr 2007 08:51:29 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 08:42:14 GMT]]>waiting for MyNova to post something next....

]]>https://fargostreet.com/post/156145https://fargostreet.com/post/156145Thu, 26 Apr 2007 08:42:14 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 08:26:35 GMT]]>Oh yeah?!

My uncle has a low 9 second Nova, and he's letting me borrow his drag to bring my car home in the fall. By default, this makes my 240SX fast since it will occupy the space normally taken by a race gas drinking drag car! :icon_tongue:

]]>https://fargostreet.com/post/156144https://fargostreet.com/post/156144Thu, 26 Apr 2007 08:26:35 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 05:27:33 GMT]]>Woot!

Send your E-girlfriends my way, I know how to satisfy them...

]]>https://fargostreet.com/post/156136https://fargostreet.com/post/156136Thu, 26 Apr 2007 05:27:33 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 04:21:25 GMT]]>See my sig. According to it, Gary has the biggest e-penis.

Grr 10
94NDTA 9
MisterCMK 6
tjamz 6
integra_gsr98 6
Turbo5Oh 4
KA-T_240 3
weshole 3
treimche 3
DaveH 3
DrifterExtreme 2
killer69penguin 2
dynotune 2
JN607 1
Seven1 1
krzydrftr93 1
bubba 1
Sweet-WRX-Lovin 1
Afsil80 1
KidSupreme 1
2wheeler 1
homie_hoges 1
torbs 1
97CL 1
24valvenotak 1
Ngige 1
MethodlesS 1
inspector01 1
SmitEvo 1

]]>https://fargostreet.com/post/156132https://fargostreet.com/post/156132Thu, 26 Apr 2007 04:21:25 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 04:05:27 GMT]]>

tjamz;166317 wrote:
Thats what weshole was saying the whole time too

lol...I was hoping you would have caught that!

]]>https://fargostreet.com/post/156128https://fargostreet.com/post/156128Thu, 26 Apr 2007 04:05:27 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 04:01:00 GMT]]>

24valvenotak;166316 wrote:
I think everybody needs to rub one out before they post on here so all their real world problems will sink away before they unleash their hatred for the world on a guy posting comments/questions/suggestions.

Just rub one out? Shit, thats the problem, I usually rub at least 2 out before I even come to a car forum.

]]>https://fargostreet.com/post/156126https://fargostreet.com/post/156126Thu, 26 Apr 2007 04:01:00 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 03:55:28 GMT]]>

94NDTA;166315 wrote:
That was an awesome burn

Thats what weshole was saying the whole time too

]]>https://fargostreet.com/post/156125https://fargostreet.com/post/156125Thu, 26 Apr 2007 03:55:28 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 03:55:23 GMT]]>its teh ghey that five people on here know everything in the world and the other 400 members are about as helpful as a nine year old girl with ADD (as obviously some people feel). If there is something constructive to be said, or perhaps somebody needs to be corrected, would it be difficult to put your flame thrower and dry studded strap on away for a moment? I think everybody needs to rub one out before they post on here so all their real world problems will sink away before they unleash their hatred for the world on a guy posting comments/questions/suggestions.

also, my second cousin's step dad has a 203984whp car that i drove once and washed wearing a FORD Master Tech shirt in a hospital waiting room. If you have any questions about anything to do with anything, I probably already wrote the book on it while wes ate my dick

]]>https://fargostreet.com/post/156124https://fargostreet.com/post/156124Thu, 26 Apr 2007 03:55:23 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 03:39:40 GMT]]>

tjamz;166293 wrote:
And trust me, weshole knows all about taking it up the ass dry.

That was an awesome burn, 10/10.

]]>https://fargostreet.com/post/156123https://fargostreet.com/post/156123Thu, 26 Apr 2007 03:39:40 GMT<![CDATA[Reply to limits of walbro 255 pump, 600hp on Thu, 26 Apr 2007 03:34:47 GMT]]>Nah, I just figured out how much output your e-penis has and realized it exceeded the flow capacities of this walbro fuel pump being discussed in this thread. Therefore you win by default.

]]>https://fargostreet.com/post/156121https://fargostreet.com/post/156121Thu, 26 Apr 2007 03:34:47 GMT