Cross-fire injection resources
Thread Starter
Racer
Joined: Oct 2021
Posts: 436
Likes: 15
From: Maryland
Cross-fire injection resources
Hello, 82 owner here. I wanna learn more about the CFI system. Any good resources other than the shop manual and the AIM? It can be at any level of technical depth.
Melting Slicks
Joined: May 2021
Posts: 2,261
Likes: 1,304
From: Fleming Island, FL
CFI is essentially the same exact thing as other GM TBI systems. The only difference is that the two injectors are placed in two separate one barrel throttle bodies instead of being in one two barrel throttle body. You'll probably find a lot more information on TBI then CFI, the principles are applied in the same manner in both systems.
Thread Starter
Racer
Joined: Oct 2021
Posts: 436
Likes: 15
From: Maryland
CFI is essentially the same exact thing as other GM TBI systems. The only difference is that the two injectors are placed in two separate one barrel throttle bodies instead of being in one two barrel throttle body. You'll probably find a lot more information on TBI then CFI, the principles are applied in the same manner in both systems.
Thread Starter
Racer
Joined: Oct 2021
Posts: 436
Likes: 15
From: Maryland
In one of the biggest libraries in Maryland at the moment, Ill see what I find. Thanks. If anyone knows of any CFI specific resources, please lmk.
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Thread Starter
Racer
Joined: Oct 2021
Posts: 436
Likes: 15
From: Maryland
If you want to know more about a better ECM, go here and start reading. EBL Also, there is a TON of good info on the Third Gen site about DIY tuning in the Technical area etc... Go here 3rd Gen Personally, I've been doing CFI for 30 years specifically and I wouldn't waste my time with PROM or programing/burning anything for CFI, it isn't worth the effort. I've been down that road two decades ago with CFI. However, if you want to improve your 82 CF, the EBL IS the right way to go since it IS 100% laptop tunable and can accommodate any mods you want to throw at it or just get a better stock tune. Also, if you are looking for a better stock tune, let me know and I will send you a GREAT stock tune for an 82 for FREE. Jus sayin'. Downside, you WILL need an EBL to use it. Hope this helps.
Melting Slicks
Joined: May 2021
Posts: 2,261
Likes: 1,304
From: Fleming Island, FL
A tune isn't just for performance. You can improve drivability, fuel economy, idle speed, etc. All the adjustments you used to make with hand tools to get the car to operate the way you prefer is done with a laptop. For example, most everyone hates that their converter locks up too early. A tune can raise the lock up MPH so it's no longer a annoyance. A updated and tuneable ECM is the single best thing for any 80's EFI car.
Last edited by Fly skids up!; Mar 8, 2022 at 10:47 PM.
Melting Slicks
Joined: Feb 2017
Posts: 3,232
Likes: 1,232
From: PHX AZ
Thread Starter
Racer
Joined: Oct 2021
Posts: 436
Likes: 15
From: Maryland
Thread Starter
Racer
Joined: Oct 2021
Posts: 436
Likes: 15
From: Maryland
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Also, the dealership called me and thanked me for the tune and was amazed how well it ran. They made one small change to the tune and lowered the idle down just a touch.
One more thing, there is not much out there on the stock ECM like there was a couple decades ago when CFI was VERY hot subject, but if you dig for it, you may find the info you seek. The 82 stock tune was never fully hacked like the 84 was BTW.
Race Director
Joined: Feb 2002
Posts: 11,599
Likes: 1,053
From: Compound in the Grove, Ga.
2026 Corvette of the Year Finalist - Unmodified
2025 C4 of the Year Winner - Unmodified
2024 C4 of the Year Finalist - Unmodified
2020 C3 of the Year Finalist - Unmodified
2019 C4 of Year Finalist (performance mods)
2018 C4 of Year Finalist
2015 C4 of the Year Finalist
St. Jude Donor '16
Some good info right here if you have not found it
https://www.corvetteforum.com/forums...solutions.html
https://www.corvetteforum.com/forums...solutions.html
Melting Slicks
Joined: May 2021
Posts: 2,261
Likes: 1,304
From: Fleming Island, FL
None! However, one guy that was testing his 82 for us and there were three 82s in the EBL test tuning, but really four which was a chevy dealership in MO with an 82 as well. One of the 82s after the final tune bin file took it out and hammered it. His reply to me was..."If my doors were wings, this car would have took off". He really liked the performance vs his stock GM ECM tune. My tune is not on the hairy edge by any means, but it isn't as conservative as GMs either. So, since mine is nowhere's stock, I can not test that tune on my 82, but like I said, four other 82s liked it. My current tune in my 82 has not been to the track yet, but 11s is in my future...ALL CFI, NO bottle.
Also, the dealership called me and thanked me for the tune and was amazed how well it ran. They made one small change to the tune and lowered the idle down just a touch.
One more thing, there is not much out there on the stock ECM like there was a couple decades ago when CFI was VERY hot subject, but if you dig for it, you may find the info you seek. The 82 stock tune was never fully hacked like the 84 was BTW.
Also, the dealership called me and thanked me for the tune and was amazed how well it ran. They made one small change to the tune and lowered the idle down just a touch.
One more thing, there is not much out there on the stock ECM like there was a couple decades ago when CFI was VERY hot subject, but if you dig for it, you may find the info you seek. The 82 stock tune was never fully hacked like the 84 was BTW.
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
My idle speed right now is good for the cam that I run which is at 850rpm. Stock idle is lower, but higher than stock and the tune was created to take advantage of the slightly higher idle speed. Base timing is stock GM spec at 6* BTDC and FP needs to be 13psi to take full advantage of the tune and its full potentical.