Hi, I'm Ryan Woody with Holley EFI and I'm here with another Holley EFI how-to video.
Today we are going to talk about how to do a launch retard in the Holley EFI software.
There are a couple of ways to do it, I'm going to show you three possible ways to do it to
all accomplish the same thing.
The first way to do it would just be to go into your system parameters, go to the basic
IO, then go to the timing retard tab, and you'll have three retards to choose from.
You either activate one, activate an input release, and then for most drag racing applications,
you'll set it to time.
You can rescale the axis however you want, usually, something like 1.5 seconds gives
you one-tenth granularity, works pretty good.
And you can build your timing retard curve from there.
You can also click the view graph button and view it graphically and then you can just
drag your timing retard however you want.
You can also right click and uncheck the space X-axis evenly and that will allow you to change
left and right on the graph and will allow you to change your time.
You see it went from .2 to .18 by doing that, so that allows you really get after it right
here.
Another way that you can do it is by adding an advanced ICF by going to a 1D table, enabling
table, name it however you want, set it to a timing offset, make the X-axis time, use
a switched enable, that's what I normally do depending on what the car has.
Usually, you'll have a trans brake input of some kind set up and you'll just select whichever
one that one is, probably your two-step or your boost control, launch input, whatever
it may be.
You'll have this table activate when your two-step or launch is disabled and I typically
also do a TPS above 75 percent for this as well, that way when you are backing up the
car with your trans brake you don't actually activate the retard and make the car stumble.
In this table, the numbers are negative vs. in the basic IO where they were positive so
you can see here it tells you that zero is the natural value that does not modify ignition
timing, a positive value adds/increases timing.
So to do a timing retard on this one, you'll go this way and put in negative 20 and you
can see you can do the same left-right drag on this as needed.
There we go.
The third and final way is the least commonly used, but some of the old calibrations you
come across might have this in it prior to V4 when you could do it this way and that
would be to use the nitrous.
With the nitrous you still have your TPS trigger to start it so you can set that how you want,
then you go to stage one and you set it to a wet non-progressive, ignore this stuff here,
all you need is a minimum and a maximum RPM, so minimum needs to be somewhere below your
two-step, maximum needs to be somewhere above your rev limiter, activation delay, you can
use this to delay it ever so slightly, some cars don't like timing pulls for the first
couple of hundredths of a second so you may just wait for two hundredths there.
Change that to zero, in this case, set the axis to time, so this is now set up the same
way as the others so you can set, again this one is positive numbers, the only place that
you use negative numbers is in the advanced table.
View it as a graph, use space X-axis evenly and it does not allow you to pull left or
right.
If you uncheck it you can now drag them left and right.
The one nice thing about doing it this way is that you can use peddling strategy and
if you do that, you know if you are going down the racetrack and for some reason you
have to lift and get back in the throttle, with the advanced table method, it might restart
it, whereas with this one you can use a programmable restarter, actually you use paused enable
and what it would do then is when you peddle the car, it would just pause the timer instead
of resetting it and therefore it would not use your launch retard again.
The benefit of that way or this way is you know, not only do you keep the timing in when
you get back in the throttle, but you also still don't activate the timing retard when
you back the car up because you are below the TPS threshold.
This way does also require two inputs vs. one for the other methods, the other methods
only require that you have the trans brake to activate them.
Because we are in the nitrous area that requires an input one to be enabled and to disable
the stage, it also requires the N2O master enable be hooked up and you know on an HP
ECU or Terminator X, this can be an issue just because you are so limited on inputs,
but on a dominator it's not a big deal, you just take this and you run it to a chassis
or battery ground or if you have an extra output you can simply loop the wire from the
input that you need over to an output and then set up and output to activate it.
And that is how you do launch retard in the Holley EFI.
I'm Ryan Woody and that was another Holley EFI how-to.