turbo and apexi

[Ewok_Poacher]

Is the apexi vtec controller mixed with a turbo asking for trouble???

[scttydb411]

depends...what's your setup?

[Ewok_Poacher]

Piggy Back controllers allow stock ECUs to do things that they normally can't do, like run larger injectors or deal with boost. Remember that piggyback controllers work by altering sensor signals before they get to the ECU.Most of the time, the primary signal being messed with is the Map Sensor. This is critically important in a Speed Density car. The Map Sensor is used by the ECU to guess how much air is going into the car, and therefore how much fuel to supply in order to match airflow. When you "lean" out a car with an AFC, you are simply decreasing the Map Sensor signal - the ECU responds to the decrease in manifold pressure by supplying less fuel. When you "richen" a car with an AFC, you are simply increasing the Map Sensor signal - the ECU responds to the increase in manifold pressure by supplying less fuel.

The change in fueling happens for a reason: if you look at a fuel table, Map Sensor values correspond with columns. When you increase or decrease the signal from the Map Sensor, you are simply making the ECU use a different column than it originally would have used. (see Understanding Maps if you need some help understanding reading Fuel and Ign tables)

But wait, isn't the Map Sensor used for determining ignition requirements too? When you "lean" out a car with a Piggy Back, you also in all likelyhood advanced timing. When you "richen" a car with a Piggy Back, you also in all likelyhood retarded timing. Look at trends horizontally (as MAP changes) in an ignition table, and you will see why this happens. This helps explain why so many boosted cars running on the "AFC hack" have issues due to excessive ignition advance.

The bottom line: Piggy Back Controllers suck because you cannot independently adjust fuel and ignition. Any changes to fueling will produce a change in ignition too, and often this is undesirable.

[brads94accord]

^ +1

agreed

[Vteckidd]

The APEX AFCs (SAFC/VAFC)are piggybacks, an are junk on a turbo car honda

The APEX Power FC is a nice STANDALONE, but its OVERkill on anything for a honda. they are great on RX7s, SR20s, but for a honda, there are MUCH better options.

Best thing to run is Chrome Pro or Hondata. Chrome pro is cheaper an has the same features as Hondata.

an yes the article you pasted is correct.

put it this way, ill break it down price wise:

SAFC/VAFC
-$350 Brand New

Hondata S200 $295
-Boost Option $200
-Chipped ECU $180
-Conversion Harness $90
Total: $765

Power FC $800

Chrome Pro FREE
-chipped ECU $180
-conversion harness $90
Total: $270

Obviously, id run the hondata or the Chrome, but clearly price wise, Chrome is much more affordable.

[o_bomb]

Chrome is the shit!!

[o_bomb]

Can u get boost option with chrome pro?

[scttydb411]

Can u get boost option with chrome pro?

yes...all day and night!

[o_bomb]

HAHA dats my boy!!^^^