Will a Ported TB lean me out??
04-21-2003, 04:34 PM
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Re: Will a Ported TB lean me out?? I can adjust it, I just don't have autotap available. I have the MAFT that I can use to tune the MAF. Do you think that adding 2% fuel to the top end will fix it?
I'm just trying to prepare for what lies ahead.
Jeff
I'm just trying to prepare for what lies ahead.
Jeff
04-21-2003, 05:33 PM
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Re: Will a Ported TB lean me out?? It's ported MAFs that cause most of the trouble.
Ported TB "should" not affect your mixture, only
higher-flow manifold pressure. The MAF is before
the TB and will see all of its air (unless you
have left a hose off or something). The TB if
everything's correct will neither introduce nor
remove air from the intake tract, only change its
flow resistance; it's mixture neutral.
A badly ported TB might give you idle problems
or such but this would come from drilling or
knife-edging the blade or grinding too far into
the seat circle, closed-blade air control, not
mixture error.
It's important to get the right TB (or swap on
the right throttle cable cam) for your year,
the difference might leave you with a throttle
blade angle short of 90 degrees (late cam on
early car) or a pretty twitchy throttle (early
cam on late car), especially if you have the ASR
pulley cluster in the middle to bind cable
travel.
Ported TB "should" not affect your mixture, only
higher-flow manifold pressure. The MAF is before
the TB and will see all of its air (unless you
have left a hose off or something). The TB if
everything's correct will neither introduce nor
remove air from the intake tract, only change its
flow resistance; it's mixture neutral.
A badly ported TB might give you idle problems
or such but this would come from drilling or
knife-edging the blade or grinding too far into
the seat circle, closed-blade air control, not
mixture error.
It's important to get the right TB (or swap on
the right throttle cable cam) for your year,
the difference might leave you with a throttle
blade angle short of 90 degrees (late cam on
early car) or a pretty twitchy throttle (early
cam on late car), especially if you have the ASR
pulley cluster in the middle to bind cable
travel.
04-21-2003, 05:44 PM
#5
10 Second Club
Re: Will a Ported TB lean me out?? Porting the throttle body should not interfere with your air/fuel ratio. Porting your TB is not harmful in the way that porting the MAF sensor is. Porting the MAF sensor disturbs its calibration, which causes it to incorrectly report airflow to the PCM. Porting the TB should allow increased airflow and if the MAF sensor is correctly calibrated, the PCM will compensate with increased fuel flow.
