wicked_b16eg

how would you time you motor to gain hp from it.
advance ment or retard.. an how much degree?

Thanks

97Ej6mike

For what type of motor, in what type of build, using what cams, with what cam gears?

wicked_b16eg

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97Ej6mike &raquo;</TD></TR><TR><TD CLASS="quote">For what type of motor, in what type of build, using what cams, with what cam gears?</TD></TR></TABLE>

b16a block, gsr head milled .030, gsr cams stock gears, skunk2 IM, AEM V2 intake, jdm 4-1 header, VAFC

Thanks

Bangher4$

I hear mexicans rave about +2 ink and -3 exh. but then again....

Go see a tuner.

your first mistake is that VAFC WAY down

wicked_b16eg

why the vafc

Bangher4$

Vafc are a cheap hack that in most cases screw things up. either making conditions too lean or rich. read up on why piggyback suck. main reason is that you cannot adjust ign and fuel independently, which is a big deal.

wicked_b16eg

gotcha.. thanks for the tip.

Bangher4$

Found this, enjoy.


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.

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.

Cheers,

Simon

wicked_b16eg

My afc was tuned by a profesional tunner, Also I don't think that is my fuel was ajusted in anyway? It might be but I do not mess with it as I don't know nor want to attemp to ajust this by myself. I only insstalled it.

what would this do to a re maped ECU?

Bangher4$

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wicked_b16eg &raquo;</TD></TR><TR><TD CLASS="quote">My afc was tuned by a profesional tunner, Also I don't think that is my fuel was ajusted in anyway? It might be but I do not mess with it as I don't know nor want to attemp to ajust this by myself. I only insstalled it.

what would this do to a re maped ECU?</TD></TR></TABLE>

No such thing as a VAFC tune IMO. Thats like saying "I tuned my car with a narrowband." Its not tuned!
Your fuel was adjusted in some way. You cannot advance timing a bit with a vafc and think your fuel is the same. No reason to use a VAFC if your ecu has been chipped (reflashed). Is it chipped?

wicked_b16eg

calm down bud.. It might seem like I'm a noob but I'm not.

Ok not tunned but "SET"

Yes I have Chipped ecu. When my swap was built and finished A local shop TUNED a chip for the mods to the motor.

Also just so you know, The person asking/writing this is not the person with this S/C. He is a friend of mine and I am trying to help him with this subject.

I myself do have a VAFC and a Chipped ecu,So I do find this interesting. My ecu started with a blank chip and the was tunned for my Engine with the mods done. when I look at my vafc there are things changed (not @ 0) but seem to be for my vtec and nothing more. But this is nice to learn so please with out the attiude inform me of what you know.

Thanks

Bangher4$

lol, Im sorry. I didnt mean to sound rude. Im calm I promise. always calm.

I defenitly think that you could get a good amount of gains with some cam timing. I cannot say what to set it at, ive never played with b series. like ive said, I hear a lot of this +2 -3 but i dont know. its nearly imposible to guess w/o some kinda tuning tool ie wideband and egt gauge. find yourself a good tunner, install the cam gears and that tuner can adjust ignition timing via egt's and fuel tables via wideband. defenitly take that vafc out tho. sell it to some poor fool. lol.

wicked_b16eg

Thanks for the tip man. Sorry for being blunt but (dont know about my buddy) I was trying to learn some thing.

Thanks