Killer '01 SS

iTrader: (2)

On AutoTap, which parameter do I log to see how close to "maxed out" my fuel injectors are? Is it the "injector pulsewidth" value, which ranges from 0 to 1000? And if that's the one to watch, at what point are the injectors "maxed out?" 1000? Sooner?

TIA.

Black LS1 T/A

Injector Pulse Width Average (that's each bank).
Maybe around 20 ms at 6000? Someone here will know the forumula.

EFILive

iTrader: (2)

rpm = revolutions per minute
rpms = revolutions per millisecond
Max INJPW = Maximum injector pulse width

rpms = rpm/60000 (60000 converts minutes to milliseconds)
Max INJPW = 2/rpms (2 revolutions to complete one 4 stroke cycle)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">code:</font><hr /><pre style="font-size:x-small; font-family: monospace;"> rpm rpms Max INJPW
10 0.00017 12000
100 0.00167 1200
1000 0.01667 120
2000 0.03333 60
3000 0.05000 40
4000 0.06667 30
5000 0.08333 24
6000 0.10000 20</pre><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">

Killer '01 SS

iTrader: (2)

That's what I needed! THANKS!!!

Team ZR-1

IMHO, it is math like this that gets people into thinking their injectors are just fine, you do NOT want to run injectors STATIC at 100% duty cycle and that is what your doing with those values. At 6,000 RPMs it would be 16 mS maximum not 20mS.

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by EFIliveV5:
<strong> rpm = revolutions per minute
rpms = revolutions per millisecond
Max INJPW = Maximum injector pulse width

rpms = rpm/60000 (60000 converts minutes to milliseconds)
Max INJPW = 2/rpms (2 revolutions to complete one 4 stroke cycle)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">code:</font><hr /><pre style="font-size:x-small; font-family: monospace;"> rpm rpms Max INJPW
10 0.00017 12000
100 0.00167 1200
1000 0.01667 120
2000 0.03333 60
3000 0.05000 40
4000 0.06667 30
5000 0.08333 24
6000 0.10000 20</pre><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"></strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">

EFILive

iTrader: (2)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Team ZR-1:
[QB] IMHO, it is math like this that gets people into thinking their injectors are just fine, you do NOT want to run injectors STATIC at 100% duty cycle and that is what your doing with those values. At 6,000 RPMs it would be 16 mS maximum not 20mS.
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I agree John, they are misleading. My apologies to anyone who misunderstood the math, I should have added what you said to my post. The purely theoretical numbers that I posted do not take into account (among other things) the opening/closing times of the injectors. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

Just for comparison, could you explain the figures/reasoning behind why you say 16ms (and not say, 15ms or 17ms) at 6,000 rpm?

Paul

Blackbird

I'm guessing he is going with the generally accepted rule of 80% duty cycle is where you want to max things out.

80% of 20 is of course 16 <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

<small>[ April 15, 2003, 04:43 PM: Message edited by: Blackbird ]</small>