Fast efi?
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Joined: Oct 2019
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Fast efi?
I'm wondering if I changed my intake mainifold and bought one of those FAST EFI systems if it would work on my 84 and still give me most of my info and controls on my dash, or even work at all. Or if there would be any advantage to it. Anyone tried that?
Melting Slicks
Joined: Mar 2001
Posts: 2,149
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From: Timra, Sweden
It will work. The 84 engine is not any different from other CSB.
Verify hood clerance when selecting intake and air-cleaner.
The dash uses it's own sensors so it will not be affected, exept for mileage information.
* Instant MPG, Average MPG and Range uses data from ECU so those three will be dead.
Verify hood clerance when selecting intake and air-cleaner.
The dash uses it's own sensors so it will not be affected, exept for mileage information.
* Instant MPG, Average MPG and Range uses data from ECU so those three will be dead.
Pro
Joined: Dec 2018
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From: Wisconsin
2023 Corvette of the Year Finalist - Modified
2022 C4 of the Year Winner - Modified
Finalist 2020 C4 of the Year - Modified
I put a Holley HP in my 85. Most of the dash still works (temps, oil pressure, rpm, fuel level, and speed.) The only thing that doesn't work is the fuel mileage related functions. It needs the factory computer for that. Cruise control is controlled by the dash so even that still works.
Le Mans Master
Joined: Sep 2013
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From: near the thumb in the mitten
IDK there would a benefit on a stock Crossfire engine, they are on the mild side.. A modded.engine ie cam, head work, headers, etc the ease off tuning would be a huge benefit.
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Mixednuttz did you see an improvement over your stock motor after the change? I figure an exhaust upgrade, with headers , a performer manifold, the 850 Fast EFI system, and a mild cam may be all I need to get better response, maybe a few horses, and the easy tuning ability would satisfy me. I have a box-stock 84 ex garage queen with 26K miles. There is really nothing I need to do or get for it, except I took off the 36 year old Gatorbacks and put on some new BF Goodriches. I just want to take my wife on an open top cruise from Vancouver down to San Diego on Highway 101 this summer (and there and back), and have a nice running GT car.
The road I live a block from is a 40 mile stretch of no-traffic, newly blacktopped, State Forest highway that twists like a "tail of the dragon" up and down and all around (highway 90 SW Missouri from Noel to Washburn). I took it the other day at average of about 65 miles an hour in my Z51 84 vette, and it was as much or more a blast than riding my sportbike down that road.. I don't need to race anyone. My neighborhood has what I need.
The road I live a block from is a 40 mile stretch of no-traffic, newly blacktopped, State Forest highway that twists like a "tail of the dragon" up and down and all around (highway 90 SW Missouri from Noel to Washburn). I took it the other day at average of about 65 miles an hour in my Z51 84 vette, and it was as much or more a blast than riding my sportbike down that road.. I don't need to race anyone. My neighborhood has what I need.
Pro
Joined: Dec 2018
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From: Wisconsin
2023 Corvette of the Year Finalist - Modified
2022 C4 of the Year Winner - Modified
Finalist 2020 C4 of the Year - Modified
I did the aftermarket EFI right after I did ported and siamesed SLP runners, a high flow base, ported plenum, and 1.6 rockers so I don't have a comparison on a stock motor. It does run much better than the stock stuff with the above modifications. I did the Holley to support a turbocharger later. (Which I'm currently in the process of doing.)
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Sounds like a mean machine Mixednuttz. A good runner that should be reliable. I'm not trying to be a 1/4 mile guy. I used to do that stuff in the 70s and 80s......and 90s, but now I'm 66 and just want a nice bit of smooth acceleration and stoplight behavior. I just wondered if anyone had tried the EASY unit. Seems like a sweet swap for the TBI, especially where tuning is concerned, though my TBI works perfectly. Everything on my car looks and works like new. I have to find something to do so I can fiddle with it,
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I did see the Holley set up. I wanted to check out the EASY EFI because one of my buds put one on his 71 Monte Carlo and it runs waaaay better. And, thanks to all of you guys for your viewpoints. Every little bit of info helps.
Last edited by Alex Darmstaedter; Feb 12, 2020 at 07:24 PM.
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Pro
Joined: Dec 2018
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From: Wisconsin
2023 Corvette of the Year Finalist - Modified
2022 C4 of the Year Winner - Modified
Finalist 2020 C4 of the Year - Modified
These new aftermarket EFI systems (I won't go into which brand, everybody seems to have a preference and why the other ones aren't as good) are absolutely incredible. I picked the system I did because of the additional items it will control. It will control the boost and, later, WM injection. Most of the systems have been out long enough that most of the bugs are worked out and have forums of knowledgeable users that can help. If you're planning on running one I'd suggest doing research to ,see sure it'll meet your needs. While I have done my own tuning on my system, I will be getting it tuned on the dyno this spring.
Instructor
Joined: Oct 2006
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I did the aftermarket EFI right after I did ported and siamesed SLP runners, a high flow base, ported plenum, and 1.6 rockers so I don't have a comparison on a stock motor. It does run much better than the stock stuff with the above modifications. I did the Holley to support a turbocharger later. (Which I'm currently in the process of doing.)
Le Mans Master
Joined: Sep 2013
Posts: 6,192
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From: near the thumb in the mitten
Emission compliance is a question for the different manufacturers. They offer different kits depending on need. Depending on use, sometimes DMV registration Antique or classic can lead to emission exemption.
if you are considering the self learning TBI and aftermarket 4 barrel intake, most of the time hood scoop is required. The 84 hood is unique, IDK if it allows for more clearance.
if you are considering the self learning TBI and aftermarket 4 barrel intake, most of the time hood scoop is required. The 84 hood is unique, IDK if it allows for more clearance.
Last edited by Kevova; Feb 13, 2020 at 09:22 AM.