Def

Giving a guy a basemap, and he's got high impedance 50 lb/hr Precision injectors. I've looked all over and can't find a listed lag/dead time(or known as injector onset time in some domestic circles).

Anybody got a reliable figure? I was thinking of a conservative 0.70-0.80 msec, but I'd really appreciate a more accurate value.


TIA

HiProfile

I find it hard to believe that you would even consider worrying about such a thing with a basemap. Thats like blindfolding a sniper, and then him asking the target's distance.

mrbsponge

i fhes using apex power FC he needs to have this info to even make the map, i dont know if hes using it but thats the only thing i could think of

Def

I'm tuning the factory ECU with a daughterboard.

Why would you NOT want to correctly set the injector lag time on a basemap? Most injectors have this information published somewhere after being measured(usually by the manuf..

Unlike a MAP based car, with a MAF you if you have the inj. lag time and global constant correctly set, the AFR will be very very close to what target AFR you specify in a cell. So yes, this is important...

Def

So no one has any idea? I thought Precision injectors were commonly used by the Honda crowd...

SJersey

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">I find it hard to believe that you would even consider worrying about such a thing with a basemap. </TD></TR></TABLE>
No offense, but Wow is that ever a misguiding/ignorant statement. The lag time is a very important piece of the puzzle....


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Def &raquo;</TD></TR><TR><TD CLASS="quote">So no one has any idea? I thought Precision injectors were commonly used by the Honda crowd...</TD></TR></TABLE>

If it is the injector I am thinking about, it is a very common injector. (two toned black and grey? and if memory serves... part number ends in 34xx???) We have used these before with a lag/dead time of .4ms

tony1

This place offers a testing service.

http://www.yawpower.com/injectordynamics.html

DOHCter

call up precision and ask them. i just tuned my car with RC injectors, and had to call up RC to get the lag time. theirs is 1.4 m/sec

stock honda according to a book is .90 m/sec, but i'm not positive how accurate that is.

and it is pretty important even for the base, if lag isn't set up right, the fuel won't inject at the proper timing and will be too lean or rich in certain instances.

good luck with that