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08-30-2014, 10:07 PM
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#1 |
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Registered User
Join Date: Jan 2008
Location: Fort Campbell KY
Posts: 271
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LC1 wideband tuning
What air/fuel ratio should I shot for when I tune my carburetor at idle, cruise, full throttle?
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John Bernard Books (The Shootist): "I won't be wronged, I won't be insulted, and I won't be laid a hand on. I don't do these things to other people and I expect the same from them." |
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08-30-2014, 11:40 PM
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#2 |
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Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,265
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Re: LC1 wideband tuning
I shoot for around 13:1 at idle - the engine will have a happy place where it is stable. I try to just encroach on lean-instability
Cruise I ~start~ at 14.7:1. Sometimes you can go leaner, sometimes it's not happy with that. It takes time to blend all the cells together smoothly. What system are you using? If you add more timing, you can go a bit leaner. Full throttle I shoot for about 12.6:1.
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1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, turbo, LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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08-31-2014, 11:32 AM
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#3 |
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Registered User
Join Date: Jan 2008
Location: Fort Campbell KY
Posts: 271
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Re: LC1 wideband tuning
Thanks for the reply, I'm running the Innovate Motorsports LC-1. While tuning for Idle should I shot for a balance of highest vacuum and leanest AFR? Or just shot for AFR?
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John Bernard Books (The Shootist): "I won't be wronged, I won't be insulted, and I won't be laid a hand on. I don't do these things to other people and I expect the same from them." |
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08-31-2014, 03:56 PM
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#4 |
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Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,265
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Re: LC1 wideband tuning
Highest vacuum will give you the most stable idle. Then see how lean you can go before the idle becomes a problem. Somewhere in-between would probably be fine. Tune the idle to what the engine wants.
I am running an LC-1 in a Lotus Super 7 replica, powered by a Corolla twin-cam, GSXR ITB's, Ford EDIS, all running off Megasquirt II. I have almost all the parts to EFI my '77 Silverado....
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1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, turbo, LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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08-31-2014, 03:59 PM
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#5 |
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Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,265
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Re: LC1 wideband tuning
These are an old set of AFR/VE/Spark tables for the Super 7 (they are NOT for a small block Chevy).
__________________
1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, turbo, LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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