Injector size.
Instructor
Joined: Jun 2003
Posts: 100
Likes: 0
From: broken arrow ok
Re: Injector size. (devilfish)
Go to this site, http://www.racesystems.com, and download the performance calculator. It's free and will tell you what injectors you need for whatever horsepower your looking for.
Burning Brakes
Joined: Sep 2000
Posts: 1,199
Likes: 1
From: NewCastle IN. USA
Re: Injector size. (devilfish)
try your stock injectors first.
I know 24lb injectors will handle 420fwhp (easily) and you may be able to do it with 22lb injectors as well. all you need is a good fuel pump (walbro) and an adjustable fuel pressure regulator (good things to have no matter what injector you run).
if they work you'll save money and have better idle/drivability than big injectors would do.
if they can't flow enough then get a set of 26lb injectors.
I'm running accel 30lb'ers and making 475fwhp and I think 26lb injectors would have been better for me.
BTW, I just looked at your sig and saw that your running a ported TPI intake so I would try the stock injectors for sure. since your not going to be running past 6000rpm the duty cycle won't be as big a deal. as rpms increase the available time to fire injectors gets shorter, that when big injectors help most.
[Modified by ol,RJ, 1:31 AM 5/15/2004]
I know 24lb injectors will handle 420fwhp (easily) and you may be able to do it with 22lb injectors as well. all you need is a good fuel pump (walbro) and an adjustable fuel pressure regulator (good things to have no matter what injector you run).
if they work you'll save money and have better idle/drivability than big injectors would do.
if they can't flow enough then get a set of 26lb injectors.
I'm running accel 30lb'ers and making 475fwhp and I think 26lb injectors would have been better for me.
BTW, I just looked at your sig and saw that your running a ported TPI intake so I would try the stock injectors for sure. since your not going to be running past 6000rpm the duty cycle won't be as big a deal. as rpms increase the available time to fire injectors gets shorter, that when big injectors help most.
[Modified by ol,RJ, 1:31 AM 5/15/2004]
Burning Brakes
Joined: Sep 2000
Posts: 1,199
Likes: 1
From: NewCastle IN. USA
Re: Injector size. (devilfish)
ah thats a different story then.
the hot cam and LT1 intake will rev higher than a TPI intake.
so I doubt the stock 22lb injectors will work at WOT 6000rpm, but since the injectors on a LT1 intake are pretty easy to change it would be worth trying them. all you'll be out is a little time tuning.
If your expected flywheel HP numbers are acurate, 24lb injectors will handle it (with higher fuel pressure if needed).
I wouldn't go any higher than 26lb injectors though.
the real problem with bigger injectors is idle/low rpms, its hard to get them lean enough. add a big cam that makes less vaccume at idle and that affects the fuel pressure (less vaccume on the fuel pressure regulator at idle = more fuel pressure at idle) making it richer too.
so for street driven cars its best to use the smallest injector that is still able to do the job.
[Modified by ol,RJ, 2:20 PM 5/16/2004]
the hot cam and LT1 intake will rev higher than a TPI intake.
so I doubt the stock 22lb injectors will work at WOT 6000rpm, but since the injectors on a LT1 intake are pretty easy to change it would be worth trying them. all you'll be out is a little time tuning.
If your expected flywheel HP numbers are acurate, 24lb injectors will handle it (with higher fuel pressure if needed).
I wouldn't go any higher than 26lb injectors though.
the real problem with bigger injectors is idle/low rpms, its hard to get them lean enough. add a big cam that makes less vaccume at idle and that affects the fuel pressure (less vaccume on the fuel pressure regulator at idle = more fuel pressure at idle) making it richer too.
so for street driven cars its best to use the smallest injector that is still able to do the job.
[Modified by ol,RJ, 2:20 PM 5/16/2004]
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
