Injector Size Question
Thread Starter
Burning Brakes
Joined: Nov 2011
Posts: 1,030
Likes: 54
From: Chandler, AZ
St. Jude Donor '12
Injector Size Question
Can someone please tell me what is the stock size injectors for a 2000 vert and a 2001 vert. I heard that they went bigger in 2001, is that true? Would there be any gain to changing them out? Thanks.
Team Owner
Joined: Dec 2010
Posts: 22,718
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From: Hillsborough NC
NC Events Coordinator
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
I only upgraded my injectors to 35 lb./hr. units after logging the duty cycle using EFI Live when I was tuning the PCM after my heads/cam mod several years ago and found they were frequently hitting the ceiling at 100% duty cycle. You don't want injectors exceeding the 80% duty cycle - that means thye are nearing their fuel delivery capacity and there's a danger of the engine running lean, which is undesireable to engine longevity. However, upsizing injectors is not recommended if you have not increased the fuel delivery pressure or the air intake volume of the motor. Here's a useful website that allows you to calculate fuel flow rate and determine the correct injector for your setup.
http://www.rceng.com/technical.aspx
http://www.rceng.com/technical.aspx
Racer
Joined: Jun 2012
Posts: 301
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From: Endicott NY
Team Owner
Joined: Aug 2003
Posts: 24,499
Likes: 312
From: Scottsdale AZ
If you're itching to do something, IMO, go for an air intake and exhaust- best grand you'll spend.
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Thread Starter
Burning Brakes
Joined: Nov 2011
Posts: 1,030
Likes: 54
From: Chandler, AZ
St. Jude Donor '12
Thanks everyone for the info, I now have a better understanding of the injectors. I have upgraded the intake, added headers and high flow exhaust but changed nothing internal on the engine, so no need to mess with the injectors yet, but soon. Thanks again for all the wisdom! 
Last edited by Todds427; Dec 26, 2012 at 10:35 PM.
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
Have you got a tune on your car since the mods? When you go in for one you can have the injector duty cycle checked to see what you are at. Like mentioned, you typically don't want to be over 80%.. I am currently at 90% with my bolt on's (and not even LT headers), and am aware that I will need to do some injectors with my next mod(s). It would be a good idea to see where you are at. If I did LT headers I would need injectors without even getting into internals. So its not always only with internals that you need new injectors, but that is usually the case.