is it normal for your car to go lean when hitting two step?? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 8 Old 09-02-2011, 08:00 AM Thread Starter
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is it normal for your car to go lean when hitting two step??

I just got a mallory hyfire 6 box and when I tried out my two step my car went lean but it smelled rich is this normal?


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post #2 of 8 Old 09-02-2011, 08:45 AM
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The car actually goes rich on a two step because the ignition box is cutting spark and allowing fuel to build up.

EMS then compensate with O2 correction to lean it back out again, which is not a desirable effect. That can create a dead spot when you let the transbrake button go.

Ideally you want O2 correction off during transition area and post launch, and if necessary on up top.


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post #3 of 8 Old 09-02-2011, 12:18 PM
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Well I thought some 2 steps cut fuel instead of spark that could cause it to go lean .

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post #4 of 8 Old 09-02-2011, 12:31 PM
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You shouldnt be running lean when making boost at any point in time

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post #5 of 8 Old 09-03-2011, 09:14 PM
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If the 2-step cuts spark, it is creating an ignition miss resulting in unburned fuel and OXYGEN. Thus, the Wideband will indicate a lean condition. If your foot is to the floor, it should be in open loop so no fuel adaptation will occur based on the false reading.
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post #6 of 8 Old 09-04-2011, 11:27 PM
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Quote:
Originally Posted by bigblocknotch View Post
If the 2-step cuts spark, it is creating an ignition miss resulting in unburned fuel and OXYGEN. Thus, the Wideband will indicate a lean condition. If your foot is to the floor, it should be in open loop so no fuel adaptation will occur based on the false reading.
X2
You will have raw girl coming out the exhaust BUT it will show as a lean condition on the oxygen sensor because the sensor is monitoring oxygen, not fuel.

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post #7 of 8 Old 09-05-2011, 01:50 AM Thread Starter
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Quote:
Originally Posted by stangjumper View Post
X2
You will have raw girl coming out the exhaust BUT it will show as a lean condition on the oxygen sensor because the sensor is monitoring oxygen, not fuel.
By oxygen sencer do you mean wide band cause that's where I'm seeing it lean

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post #8 of 8 Old 09-05-2011, 05:12 AM
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Yes

New build in progress: Twin Gen 2 PT6466 352

Old combo:352 single 76mm turbo, 16psi, AOD, 9.41 @ 149mph, E85, 255/50/16 MT DR, 3500lb STREET car driven everywhere.
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