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Rich at Idle, Lean under load

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Old Apr 6, 2010 | 04:26 PM
  #1  
dan_t's Avatar
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From: BC, Canada
Car: C4 Vette
Engine: Gas Guzzler
Transmission: ZF-6 Manual
Axle/Gears: 3.75
Rich at Idle, Lean under load

Just looking at what I can do with regards taking my tune further. The car runs strong but as per usual its drivability that I'm struggling with.

Now heres one problem that I'd like to find a work around for.

With my cam I'm iding in the 70-75kpa range. This also seems to be similar to where I cruise at lets say 1400rpm.

Now the problem comes that if I fatten the VE up in this area light load and pulling away become troublesome so I generally tune this area for that purpose. The downside of this though is that loading up in 6th gear and sometimes 5th can actually lean to the point of a backfire. (Obvioulsy I don't let it do this).

I'm always having to change down gears for inclines rather than being able to throttle through it.

What can I do to combat this problem?
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Old Apr 7, 2010 | 09:41 AM
  #2  
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From: Chasing Electrons
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Re: Rich at Idle, Lean under load

What happens if you fatten up the VE and reduce the AE? It may be that there is too much AE during acceleration. The other thing is that 1400 RPM is low for cruising in 5th or 6th gear with that cam.

RBob.
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