LS3 injector question
Thread Starter
Drifting
Joined: Sep 2008
Posts: 1,273
Likes: 9
From: O'Fallon MO
LS3 injector question
Ok, so a few months back I threw a rod in my LS6 (03z). Well tomorrow I'm driving to OK to pick up an LS3 from a 2010 Camaro 6spd.
I have a cam that I was planning on putting in my LS6 but didn't get the chance to before the motor went. I have SVO 30 injectors now (they flow 36# on the C5 fuel system) as it was generally recommended to change out injectors if doing a head/cam package to keep the duty cycle from being up at the 100% mark.
Well here's a few questions:
1) It's my understanding that the LS3 has 43# injectors....is that correct?
is it the same for the Camaro?
2) Will the stock injectors be adequate with putting my cam in this LS3? I may do some head work as well....
3) Anyone know what the stock cam specs are off hand?
4) Also anyone know what the compression of the LS3 is, and is it the same for the Camaro?
Figured the C6 section might have these answers. I know little to nothing about these motors as I have spent the last few years with my head stuck in the C5 section...
Any help would be appreciated
I have a cam that I was planning on putting in my LS6 but didn't get the chance to before the motor went. I have SVO 30 injectors now (they flow 36# on the C5 fuel system) as it was generally recommended to change out injectors if doing a head/cam package to keep the duty cycle from being up at the 100% mark.
Well here's a few questions:
1) It's my understanding that the LS3 has 43# injectors....is that correct?
is it the same for the Camaro?
2) Will the stock injectors be adequate with putting my cam in this LS3? I may do some head work as well....
3) Anyone know what the stock cam specs are off hand?
4) Also anyone know what the compression of the LS3 is, and is it the same for the Camaro?
Figured the C6 section might have these answers. I know little to nothing about these motors as I have spent the last few years with my head stuck in the C5 section...
Any help would be appreciated
Le Mans Master
Joined: Mar 2010
Posts: 7,050
Likes: 945
From: DFW TX
The stock LS3 injectors are 42lb injectors and are more than adequate for about 500-525 rear wheel. You will be fine with a H/C setup, but be sure and check the duty cycle when you're on the dyno.
Drifting
Joined: Aug 2007
Posts: 1,368
Likes: 18
"just" is a touchy word here. It would really suck to spend the money to tear the thing apart and put it back together, and tune, only to find out that you're out of injector, and have to spend another 2 grand on parts and labor to rectify the problem.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Sep 2004
Posts: 6,019
Likes: 568
From: Conroe Texas
a little off track here but, my son is rebuilding his ls2, installing a callies 402 rotating assy, putting on afr 260 ls3 heads and aftermarket intake, larger cam and headers. what would be the ball park injector size be?
thanks.
thanks.
Drifting
Joined: Aug 2007
Posts: 1,368
Likes: 18
was referring to parts and labor on fuel pump and injector replacement. my understanding is, if one is overtaxed, so is the other.
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
LS3 and LS7 injectors are the same. I've seen lots of pretty salty LS7 builds and never a mention of an injector upgrade. Mild LS7 build goes where an aggressive LS3 build can't. No need to upgrade the injectors on an N/A LS3 build.
Safety Car
Joined: Aug 2017
Posts: 4,243
Likes: 1,133
From: North Myrtle Beach SC
Upping injectors doesn’t mean you need to upgrade pumps. In an LS1 build I did I had to replace the original 28# injectors (were at 100% duty cycle) with 36# injectors during the tune. No issues after that and never touched the pump.
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,151
From: SW Florida
2021 C6 of the Year Finalist - Modified
As far as the C6 .... The LS2, LS3 and LS6 injectors are rated at there normal operating fuel pressure of 58 PSI
Stock LS3 Injectors ... 41.7 Lb/Hr @ 58 PSI (438 cc/Min)
_________________________________
See Chart Below ... Looks like the LS3 injectors will support 567 Flywheel HP (Approx 493 RWHP) at 85% Duty Cycle
BTW ... The chart below don't show it, but ... At 90% Duty Cycle, the LS3 injectors should support 600 Flywheel HP (Approx 522 RWHP)
.
Stock LS3 Injectors ... 41.7 Lb/Hr @ 58 PSI (438 cc/Min)
_________________________________
See Chart Below ... Looks like the LS3 injectors will support 567 Flywheel HP (Approx 493 RWHP) at 85% Duty Cycle
BTW ... The chart below don't show it, but ... At 90% Duty Cycle, the LS3 injectors should support 600 Flywheel HP (Approx 522 RWHP)
.
Last edited by Turbo6TA; Oct 28, 2018 at 09:38 PM.