When do I need better injectors?
Pro
Joined: Sep 2008
Posts: 713
Likes: 2
From: Tennessee
Depends on your duty cycle but most people buy injectors when they do heads/cam swap. You may be able to get away with it with a small cam only job. They would be maxed out.
Drifting
Joined: Dec 2002
Posts: 1,474
Likes: 4
From: Tracy CA
Stock 2000 LS1 are rated at 24# at 3 bar. The LS1 actually runs at 4 bar (atmospheres - 4 x 14.7 psi) so you get 28#. They are made by bosch.
When I upgraded - I had to upsize my injectors (per the tuner). He also said - it's not a problem to overshoot the sizing by a bit. So if you only need 32, you can buy something like a 42 withouth a problem. Waaay oversized has some issues with pooling and spray pattern from what I've heard. I bought 36# injectors (image below) which would actually flow around 42 from what I was told. I'm at 412 rwhp.
I found a set rebuilt - which simply consists of taking it apart and cleaning the basket and shooting a little carb cleaner through them. They were flow tested to within 2%.
They're one of the most reliable parts of the car.
When I upgraded - I had to upsize my injectors (per the tuner). He also said - it's not a problem to overshoot the sizing by a bit. So if you only need 32, you can buy something like a 42 withouth a problem. Waaay oversized has some issues with pooling and spray pattern from what I've heard. I bought 36# injectors (image below) which would actually flow around 42 from what I was told. I'm at 412 rwhp.
I found a set rebuilt - which simply consists of taking it apart and cleaning the basket and shooting a little carb cleaner through them. They were flow tested to within 2%.
They're one of the most reliable parts of the car.
Former Vendor
Joined: May 2005
Posts: 3,749
Likes: 4
From: Valencia Ca
Here is the math..
HP x BSFC / Number of Injectors x Duty Cycle
example
HP = 350
BSFC = .5 (normally aspirated)
Injectors =8
Duty Cycle = .80 (80%)
350 x .5 = 175
8 x .80 = 6.4
175 / 6.4 = 27.34 lb hr
Thread Starter
Burning Brakes
Joined: Jan 2008
Posts: 1,005
Likes: 1
From: springfield MO
I guess if I can find a 36 or 42lb thatll be ok?
Any brands to stay away from? Or ones to try and get?
I have no clue about injectors
Thread Starter
Burning Brakes
Joined: Jan 2008
Posts: 1,005
Likes: 1
From: springfield MO
$400 for injectors? I know Ive seen GM ones for $199 but can't remember how many lbs they were or if they were even for LS1s, not sure if injectors are engine specific though?
Former Vendor
Joined: May 2005
Posts: 3,749
Likes: 4
From: Valencia Ca
Of course the price varies and there are many good choices as well as bad - look for SVO RED TOPs - seen them for 125-150 a set -
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Drifting
Joined: Dec 2002
Posts: 1,474
Likes: 4
From: Tracy CA
FWIW: My tuner turned me away from the ford SVO injectors. More likely than anything else - he didn't know how to tune them. So a consideration is what your tuner is familiar with - because he's the guy who has to make them work.
