Injector Size
Thread Starter
Burning Brakes
Joined: Dec 2014
Posts: 1,038
Likes: 44
From: Pensacola Florida
Injector Size
I replaced the bad OEM injectors in my 89 L98 with 21lb Accel injectors and the preformance really diminished, obviously they are too small.
I've noticed a small coolant leak by the LF on my intake so I'm soon going to need to change the gasket. While I have it apart I want to put the right size or slightly larger injectors back in.
What is the largest size injector I can install without doing any reprogramming or retuning?
Is there an aftermarket manifold that increases power?
Rick
I've noticed a small coolant leak by the LF on my intake so I'm soon going to need to change the gasket. While I have it apart I want to put the right size or slightly larger injectors back in.
What is the largest size injector I can install without doing any reprogramming or retuning?
Is there an aftermarket manifold that increases power?
Rick
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
Burning Brakes
Joined: Jan 2000
Posts: 831
Likes: 31
From: Merritt Island Florida
You shouldn't go bigger without any tuning. What year and what mods do you have on the car? I have some Bosch 3s in 22 and 24 if you are in a jam and need them quick and cheap. Need to know year and goals to suggest a manifold change if needed
Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
Are you thinking that lager injectors will give you more power? Sorry, but that's not how the system works. The ECM will just reduce the pulse width of larger injectors (to a limit) to keep the air/fuel ratio within parameters. If the ECM can't adapt to the larger injectors, your performance and fuel mileage will suffer.
Thread Starter
Burning Brakes
Joined: Dec 2014
Posts: 1,038
Likes: 44
From: Pensacola Florida
Are you thinking that lager injectors will give you more power? Sorry, but that's not how the system works. The ECM will just reduce the pulse width of larger injectors (to a limit) to keep the air/fuel ratio within parameters. If the ECM can't adapt to the larger injectors, your performance and fuel mileage will suffer.
Well, I was mainly looking to restore the power it had before the Accels went in, There is definitely a difference. If I could get a little more by replacing the manifold without any reprogramming that would be worth considering. I'm not racing it but do like the power.
I sent a PM to FIC and got an immediate response with an answer to the injectors, sounds like I need to go with Bosch 3s.
As for the manifold, yes I'd like a little more power if replacing it without any other modifications would supply it but if it would take any reprogramming it's not worth it at this time.
Thanks for the replies, this forum is very helpful.
Rick
Thread Starter
Burning Brakes
Joined: Dec 2014
Posts: 1,038
Likes: 44
From: Pensacola Florida
The goal in a manifold change would just be whatever power I could squeeze out of it without any other modifications.
Rick
Last edited by shootnstarz; May 21, 2015 at 09:06 AM.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
The stock injectors for the 89 were rated at 22 pounds with 43.5 pounds of pressure at the fuel rail.
So you could install the correct injector or buy an adjustable fuel pressure regulator and increase the pressure above the 43.5 pounds. You would have to play with this to find the sweet spot for pressure.
So you could install the correct injector or buy an adjustable fuel pressure regulator and increase the pressure above the 43.5 pounds. You would have to play with this to find the sweet spot for pressure.
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
Burning Brakes
Joined: Jan 2000
Posts: 831
Likes: 31
From: Merritt Island Florida
Correct part number for the 22lbers is 0280155710 or 700 in Bosch 3. They will be yellow. I have tons of them. You also lose some weight over the stockers. Great mod. Has 4 hole pintle for better spray pattern too.
Thread Starter
Burning Brakes
Joined: Dec 2014
Posts: 1,038
Likes: 44
From: Pensacola Florida
Bosch 3s it will be. I just noticed a small coolant leak on the LF on my intake so a new gasket is upcoming and that will be the time to replace the injectors. But I need to get the hit and run damage repaired before anything.
Rick
Rick