Haltech Fuel or ignition cut-off?
02-24-08, 04:03 AM
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Leah Dizon > Roast Beef
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Fuel or ignition cut-off?
What are the pros/cons of fuel versus ignition cut-off? I'm thinking ignition might be a safer bet but what do you guys think?
02-24-08, 02:04 PM
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This is also very dependent on who you ask, some people say ignition cut some say fuel cut. I personally think that fuel cut is best, its what the OEM manufacturers use, and if you think about it logically this is how i see it:
Fuel cut, turns off the fuel completely thus literally shutting off the engine keeping it from reving any higher or running more boost. Spark doesnt do anything firing on its own.
But!
Ignition cut takes away the spark but the fuel keeps pouring into the eninge, when you turn the spark back on that fuel that is in the cylinder lights up and you probably get a premature explosion.
Then there's Soft Cut and Hard Cut, soft cut starts cutting fuel or ignition on one cylinder first, then 2, then 3 and so on, some people say this is the best way of doing rev limiting.
On the Haltech E8/E11 you have both options available to you, but we all know what can happen from cutting one rotor like the OEM.
Fuel cut, turns off the fuel completely thus literally shutting off the engine keeping it from reving any higher or running more boost. Spark doesnt do anything firing on its own.
But!
Ignition cut takes away the spark but the fuel keeps pouring into the eninge, when you turn the spark back on that fuel that is in the cylinder lights up and you probably get a premature explosion.
Then there's Soft Cut and Hard Cut, soft cut starts cutting fuel or ignition on one cylinder first, then 2, then 3 and so on, some people say this is the best way of doing rev limiting.
On the Haltech E8/E11 you have both options available to you, but we all know what can happen from cutting one rotor like the OEM.
02-25-08, 03:27 AM
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Leah Dizon > Roast Beef
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I'm using the E6X has which both options so I guess I'll have experiement with them. I just wondered if there was any major downpoint to one or the other.
Thanks guys.
Thanks guys.
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04-07-11, 10:42 AM
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i did my ignition cut at 5k, and the first time we did it, mad backfire and flames, but now, it just sounds like a regular 2-step with no backfire, any ideas? helpp
04-13-11, 05:59 PM
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If you had a temp correction at the time you first tried the ignition cut it could well have been cutting with a richer mixture causing flames.
Both fuel and ignition cut works just fine.
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