PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Question on IFR changes for new injectors..

Old Jul 13, 2005 | 08:21 PM
  #1  
zupmanZ28's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Jul 2004
Posts: 81
Likes: 0
Default Question on IFR changes for new injectors..

I have 28.8's now, i'm upgrading to 36's. I have the excel data table that has been posted already for the IFR table change, but i'm not sure which fuel pressure reading i'm supposed to input.

Is it the KOEO fuel pressure, fuel pressure at idle, fuel pressure at WOT, fuel pressure with regulator disconnected...which one?

This is a stock pump if that matters. I'm sure this question has been asked a million times, i tried searching but couldn't find any terms that gave me good results. Sorry in advance for being an idiot...

Eric
Reply
Old Jul 13, 2005 | 08:52 PM
  #2  
GEN3Typhoon's Avatar
Staging Lane
iTrader: (5)
 
Joined: Apr 2004
Posts: 64
Likes: 0
From: Knoxville, TN
Default

I am assuming you know that injectors are rated at 43.5 psi.

So the second pressure for your new injectors is what they are at at idle.

With the vacuum line attached if your fuel system is set up that way.

Hope that helps.
Reply
Old Jul 13, 2005 | 09:19 PM
  #3  
zupmanZ28's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Jul 2004
Posts: 81
Likes: 0
Default

thats exactly what i needed to know, thanks

Eric
Reply
Old Jul 14, 2005 | 07:52 AM
  #4  
WS6FirebirdTA00's Avatar
TECH Senior Member
20 Year Member
iTrader: (33)
 
Joined: Mar 2003
Posts: 8,319
Likes: 1
From: North Carolina
Default

it depends how the table is set up and if it takes into account for fuel pressure drops towards wot, which the stock fuel pump tends to do.
Reply


Thread Tools
Search this Thread

All times are GMT -5. The time now is 09:39 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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-7
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
story-8
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

The world was a better place when it was still around.

By Brett Foote | 2026-01-23 09:20:37


VIEW MORE
story-9
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

Slideshow: The 7.0-liter LS7 was designed for absolute cutting-edge performance.

By Verdad Gallardo | 2026-01-07 18:36:00


VIEW MORE