Injectors for c5?
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6th Gear
Joined: Sep 2020
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Injectors for c5?
Wanting to know what injectors you guys recommend. My car is a 02 base w/ BTR stage 3 cam package, timing set, full exhaust and tune. Only thing holding me back from getting the most out of the car is the stock injectors. Just don't know which bigger ones I should go with. Thanks 
No Hostility Be Happy
Joined: Aug 2018
Posts: 10,093
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From: South Hill Wa
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
If it's already tuned what was your injector duty cycle? Why do you think you need more injector?
Thread Starter
6th Gear
Joined: Sep 2020
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Instructor
Joined: May 2019
Posts: 159
Likes: 50
I've got a set of Bosch white injectors waiting for my head/cam car.
They are 36lb/hr in their stock application, which runs less PSI than a C5... Should have 500whp headroom with ease.
Bosch short #: 62203, currently under $43 each new. I kind of chose them based upon ease of install, same height, diameter and electrical connector. Allegedly they should be easy to tune. Time will tell.
They are 36lb/hr in their stock application, which runs less PSI than a C5... Should have 500whp headroom with ease.
Bosch short #: 62203, currently under $43 each new. I kind of chose them based upon ease of install, same height, diameter and electrical connector. Allegedly they should be easy to tune. Time will tell.
Le Mans Master
Joined: Dec 2017
Posts: 5,628
Likes: 3,333
From: Virginia
2021 C5 of the Year Finalist - Modified
St. Jude Donor '21-'22
I've been pretty happy with the 60# Siemens injectors that came in my A&A kit. Obviously, your setup is a bit different than mine.
Race Director
Joined: Oct 2004
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Wanting to know what injectors you guys recommend. My car is a 02 base w/ BTR stage 3 cam package, timing set, full exhaust and tune. Only thing holding me back from getting the most out of the car is the stock injectors. Just don't know which bigger ones I should go with. Thanks
), you'd probably be better off with even bigger injectors than the C5Z06 has. Stock LS7 are 42lb/hour, FYI.....
No Hostility Be Happy
Joined: Aug 2018
Posts: 10,093
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From: South Hill Wa
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
Regardless, I'm still skeptical he's actually running out of injector on that combo based on what others have done in the past including myself.
I easily made 420ish wheel on a mustang dyno with factory 28lbs units. Others have made even more.
EDIT
1997-1998 LS1 28.5 lbs
1999-2000 LS1 26.3 lbs
2001-2003 LS1/LS6 28.5 lbs
Last edited by Mr. Black; Jan 26, 2022 at 12:00 PM.
Race Director
Joined: Oct 2004
Posts: 12,864
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grinder, his car should have the 28lb injectors in it already. There is a post somewhere that explains all the different years of c5s and when they had 26s or 28s.
Regardless, I'm still skeptical he's actually running out of injector on that combo based on what others have done in the past including myself.
I easily made 420ish wheel on a mustang dyno with factory 28lbs units. Others have made even more.
EDIT
1997-1998 LS1 28.5 lbs
1999-2000 LS1 26.3 lbs
2001-2003 LS1/LS6 28.5 lbs
Regardless, I'm still skeptical he's actually running out of injector on that combo based on what others have done in the past including myself.
I easily made 420ish wheel on a mustang dyno with factory 28lbs units. Others have made even more.
EDIT
1997-1998 LS1 28.5 lbs
1999-2000 LS1 26.3 lbs
2001-2003 LS1/LS6 28.5 lbs
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Race Director
Joined: Oct 2004
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I've got a set of Bosch white injectors waiting for my head/cam car.
They are 36lb/hr in their stock application, which runs less PSI than a C5... Should have 500whp headroom with ease.
Bosch short #: 62203, currently under $43 each new. I kind of chose them based upon ease of install, same height, diameter and electrical connector. Allegedly they should be easy to tune. Time will tell.
They are 36lb/hr in their stock application, which runs less PSI than a C5... Should have 500whp headroom with ease.
Bosch short #: 62203, currently under $43 each new. I kind of chose them based upon ease of install, same height, diameter and electrical connector. Allegedly they should be easy to tune. Time will tell.
Instructor
Joined: Jul 2021
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From: Erie PA
I put an Accel performance coil on my race truck back when I was Weekly Series Nascar racing. I chased a hard start, miss issue for many weeks, changed carbs, distributers grounds, everything I could think of or anyone else suggested, until the last thing I hadn't changed was the new coil. Put an old oem one on it and it ran like a scalded cat!! I don't know where that "new" coil landed when I threw it as hard as I could!
Accel is JUNK!!!!
Accel is JUNK!!!!
Safety Car
Joined: Jan 2019
Posts: 4,308
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From: Somewhere, Florida
St. Jude Donor '20-'21-'22-'23-'24
I've got a set of Bosch white injectors waiting for my head/cam car.
They are 36lb/hr in their stock application, which runs less PSI than a C5... Should have 500whp headroom with ease.
Bosch short #: 62203, currently under $43 each new. I kind of chose them based upon ease of install, same height, diameter and electrical connector. Allegedly they should be easy to tune. Time will tell.
They are 36lb/hr in their stock application, which runs less PSI than a C5... Should have 500whp headroom with ease.
Bosch short #: 62203, currently under $43 each new. I kind of chose them based upon ease of install, same height, diameter and electrical connector. Allegedly they should be easy to tune. Time will tell.
Race Director
Joined: Oct 2004
Posts: 12,864
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One choice that used to be very popular on the forums was Ford 30lb SVO injectors. They were rated at 30lbs@3 bar pressure, so they were nearly 40lb@4bar, which is the C5 OEM fuel pressure. I believe they were plug and play with the EV connectors, but that may depend on C5 model year. Like I said, this was a long time ago, so they may not be available today. They were good injectors.......
Melting Slicks
Joined: Nov 2016
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From: East Metro (Twin Cities) Minnesota
St. Jude Donor '21
Unless you are doing a 5 mile race, you are probably only hitting 90% for a second or three.
Have you logged with a wideband - I am betting you are O.K. but trust the wideband over my opinion.
If you get new injectors, make sure you get good data that your tuner has had success with.
Safety Car
Joined: Aug 2011
Posts: 4,450
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From: Portland OR
In other words, they don’t stop delivering the correct amount of fuel.
Even 100% is ok.
All as long as the air fuel ratio remains correct.
Just fyi.
If you want bigger that are easy to tune LS2 would work fine and are 33 lb/hr. LS3 are 42.
Both are short and would need top hat adapters
Advanced
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Hi, I’m installing a LS6 intake and throttle body from a 03Z06 in my 99LS1C5 The person I’m buying these from also is selling his injectors and fuel rail. I’m thinking while i have everything torn apart i might as well buy the injectors/fuel rail from him. From reading this post it seems like i should upgrade to get the same rating as other C5’s. Thoughts? He indicated that his Z has about 45k miles. Thanks for any/all advise. If its a decent upgrade, what’s a fair price to offer?
No Hostility Be Happy
Joined: Aug 2018
Posts: 10,093
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From: South Hill Wa
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
Hi, I’m installing a LS6 intake and throttle body from a 03Z06 in my 99LS1C5 The person I’m buying these from also is selling his injectors and fuel rail. I’m thinking while i have everything torn apart i might as well buy the injectors/fuel rail from him. From reading this post it seems like i should upgrade to get the same rating as other C5’s. Thoughts? He indicated that his Z has about 45k miles. Thanks for any/all advise. If its a decent upgrade, what’s a fair price to offer?
Second, going from a 26 to a 28lb injector is going to cost you money because the tune will have to be changed and you will gain nothing. You can not just swap fuel injector sizes at your leisure. Fuel rail is a no gain part as well.