VAFC insight
01-31-2007, 11:32 AM
#11
Registered User
Originally Posted by deathsled,Jan 31 2007, 03:24 PM
a VAFC adds or subtracts fuel. The only thing that can add or subtract "air" is the throttle......
01-31-2007, 12:18 PM
#12
I was under the impression that it could. From the documentation it appears that it (neo) has 16 points of fuel correction at +/- 50%.
The AFC neo is a sub-computer in which the airflow sensor signal or the pressure
sensor signal can be modified to increase/decrease fuel for each engine rotation
speed. Even in light tuning such as an air cleaner/muffler replacement, a shift
in air/fuel ratio occurs in greater or lesser degrees. This is due to the
difference between the airflow detected by the airflow sensor and the actual
airflow caused by a change in the airflow that passes through the airflow sensor.
The AFC neo can correct this difference to set the original air/fuel ratio
and increase the power. It also has various functions such as a VTEC control
function and a function to prevent engine stall. Furthermore, it can be used as
a meter to check vehicle conditions with various monitoring functions.
sensor signal can be modified to increase/decrease fuel for each engine rotation
speed. Even in light tuning such as an air cleaner/muffler replacement, a shift
in air/fuel ratio occurs in greater or lesser degrees. This is due to the
difference between the airflow detected by the airflow sensor and the actual
airflow caused by a change in the airflow that passes through the airflow sensor.
The AFC neo can correct this difference to set the original air/fuel ratio
and increase the power. It also has various functions such as a VTEC control
function and a function to prevent engine stall. Furthermore, it can be used as
a meter to check vehicle conditions with various monitoring functions.
01-31-2007, 12:21 PM
#13
Registered User
Originally Posted by e3opian,Jan 31 2007, 04:18 PM
I was under the impression that it could. From the documentation it appears that it (neo) has 16 points of fuel correction at +/- 50%.
01-31-2007, 12:23 PM
#14
01-31-2007, 12:30 PM
#16
Originally Posted by TepEvan,Jan 31 2007, 04:25 PM
SO perhaps the NEO can, but the VAFC1/2 had limited capabilities?
01-31-2007, 12:31 PM
#17
[QUOTE]In the VTEC AFC II, the VTEC changeover point of a vehicle with a VTEC engine can be adjusted
at an optional engine RPM. This fuel adjustment controller can increase and decrease
fuel in a wide range of +50% to
at an optional engine RPM. This fuel adjustment controller can increase and decrease
fuel in a wide range of +50% to
01-31-2007, 02:32 PM
#19
Registered User
Thread Starter
I have an '00 so thats the ecu I'm running. It was mentioned to me about the AFC Neo and that the VAFCII was replaced by that. I'm most likely going to go ahead with a dyno and see what numbers I put out. I should have been ok with this set up but of course thats not my luck. I also have about 8.5k on the new motor now. 
Thanks for the input guys. You're the best.
Thanks for the input guys. You're the best.
01-31-2007, 02:45 PM
#20
Registered User
If you truly are running lean, I highly suggest against a dyno run... if you're pushing a lean condition a strong pull is going to detonate a block. The VAFC can increase fuel by extending the injectors pulse length.
A lean condition doesn't surprise me... the AP1 ECU is designed for a 2L engine, so it's trying to put 2L worth of gas into a 2.2L set of cylinders. A 10% lean condition is nasty for any length of time, I would personally not run it that way even on a trip to the store. The VAFC could easily knock out that 10%, though I have a slight reservation about the ECU's ability to learn out that adjustment (probably okay in this case).
A lean condition doesn't surprise me... the AP1 ECU is designed for a 2L engine, so it's trying to put 2L worth of gas into a 2.2L set of cylinders. A 10% lean condition is nasty for any length of time, I would personally not run it that way even on a trip to the store. The VAFC could easily knock out that 10%, though I have a slight reservation about the ECU's ability to learn out that adjustment (probably okay in this case).