Fueling & Injection Fuel Pumps | Injectors | Rails | Regulators | Tanks

walbro 255lph

Thread Tools
 
Search this Thread
 
Old Apr 22, 2008 | 03:05 AM
  #1  
kbraklr's Avatar
Thread Starter
Staging Lane
 
Joined: Aug 2007
Posts: 61
Likes: 0
From: Tampa, FL
Default walbro 255lph

how much hp can a walbro 255lph pump support?? can it support 9 psi from a turbo kit on an ls1 with lq9 heads? ~575 rwhp?
Reply
Old Apr 22, 2008 | 07:46 AM
  #2  
ls1290's Avatar
Dumb Ass Vette Moderator
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (20)
 
Joined: Jun 2002
Posts: 4,281
Likes: 2
From: Colorado
Default

I think the 255L can support around 600ish NA. For FI, I would not push one past 525 to 550ish rwhp.

Keith
Reply
Old Apr 22, 2008 | 09:52 AM
  #3  
MaxC5's Avatar
Teching In
iTrader: (4)
 
Joined: Nov 2005
Posts: 17
Likes: 0
From: Orlando
Default

Hmmmm so for FI, what would be the next step? Especially at 9psi.
Reply
Old Apr 22, 2008 | 10:03 AM
  #4  
ulakovic22's Avatar
TECH Resident
iTrader: (12)
 
Joined: Apr 2006
Posts: 956
Likes: 1
From: Lantana, TX
Default

https://ls1tech.com/forums/fueling-injection/856954-diy-twin-pumps-quick-cheap.html
Reply
Old Apr 22, 2008 | 11:40 AM
  #5  
MaxC5's Avatar
Teching In
iTrader: (4)
 
Joined: Nov 2005
Posts: 17
Likes: 0
From: Orlando
Default

That would be a stretch inside a 2001 C5 bucket. I'm leaning in that direction though, thanks for the link.
Reply
Old Apr 22, 2008 | 12:16 PM
  #6  
ls1290's Avatar
Dumb Ass Vette Moderator
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (20)
 
Joined: Jun 2002
Posts: 4,281
Likes: 2
From: Colorado
Default

It is possible to get twin 255L pumps into a C5 tank. It is a tight fit, but doable.

Keith
Reply
Old Apr 22, 2008 | 02:40 PM
  #7  
Lonnies Performance's Avatar
LS1TECH Sponsor
iTrader: (16)
 
Joined: Feb 2007
Posts: 2,662
Likes: 2
From: Pittsburgh, PA
Default

I make a plug-n-play twin intank setup for the C5 Vette if you are looking for a complete setup.
Reply
Old Apr 22, 2008 | 03:49 PM
  #8  
MaxC5's Avatar
Teching In
iTrader: (4)
 
Joined: Nov 2005
Posts: 17
Likes: 0
From: Orlando
Default Twin 255s in tank for 2001 C5

Sorry to hi jack this thread

Currently I'm running a P1SC-1 with 42s, one 255 in tank, and KB BAP. I'm running out of fuel (starts to lean out) on the top end at around 5000 rpm making 8psi, and the fuel pressure drops from approx. 60 psi to 45psi (this is unacceptable). The injector duty cycles are over 120, I think Im running out of pump, I cannot see going to 60# injectors as I have stock heads and cam.

I have seen others run around 5 or 6 psi with a racetronix and BAP with no problem, but they are staying in the 470 to 500 rwhp range, I think I'm going to be over that.

Let me know what you think.
Later,
Max
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Apr 22, 2008 | 04:30 PM
  #9  
MaxC5's Avatar
Teching In
iTrader: (4)
 
Joined: Nov 2005
Posts: 17
Likes: 0
From: Orlando
Default

Originally Posted by Lonnies Performance
I make a plug-n-play twin intank setup for the C5 Vette if you are looking for a complete setup.
Is this the kit you are referring to.....if so tell me more.
What is meant by "Requires your sending unit for modification"?

Early C5 Vette Double Pumper - Twin High Output Fuel Pump Kit, Wiring Harness & Hobbs Switch - Fully Assembled & Tested
Requires your sending unit for modification
1997-early 2003 RX-C5-GSS340-DP-PKG

Thanks,
Max
Reply
Old Apr 22, 2008 | 08:04 PM
  #10  
Lonnies Performance's Avatar
LS1TECH Sponsor
iTrader: (16)
 
Joined: Feb 2007
Posts: 2,662
Likes: 2
From: Pittsburgh, PA
Default

I require your sender as I reuse the cover plate & the level sensor.

Kit retains the stock connections for ease of replacement & will work with stock lines. No tank modifications are required.

For more information, I can be reached at (724)322-8505

The best time to reach me for tech support is 7:00pm-11:00pm eastern time weekdays & 9:00am-11:00pm weekends.
Reply




All times are GMT -5. The time now is 03:11 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE