[Diy_efi] forum and calculating sequential injection time

Mike niche
Tue May 17 18:55:15 UTC 2011

from what i recall of the issue vs batch and sequential is the difference is not that much,
batch can use smaller injectors, sequential needs injectors with more flow,
batch seems to work fine on many production cars as half the time the spray
is against the (hot) closed inlet valve, so some vapourisation takes place,
timing the sequential might not allow as much time for evaporisation (comparitively),
so the first (and quite important) question arises:-

Why introduce complexities in respect of sequential when batch seems to work fine ?



At 02:20 AM 5/18/2011, Jay Rabe wrote:
>I have heard people refer to the forum quite a bit but never found anything but archives of this email list.  Is that what people are referring to as the forums? 
>I know theres issues with the mailing list but figured its worth a shot to ask about sequential timing.  If anyone cant get through the diy list my email is <mailto:jayrabe at gmail.com>jayrabe at gmail.com
>I am trying to figure out how to calculate sequential injector end time.  I have searched for hours and havent found much helpful besides <http://www.oocities.org/fwarner_au/mc_things/efiithoughts.html>http://www.oocities.org/fwarner_au/mc_things/efiithoughts.html which i believe was/is someone on here.  I started <http://efi101.com/forum/viewtopic.php?p=45567#45567>a topic on this at efi101 but i havent really gotten anywhere there.  I know on the dyno with a 5 gas analyzer is the correct way to do it but i dont have the $ for dyno time.  I need to get through emissions (adding a cat too for the tailpipe tests)
>My standalone <http://i240.photobucket.com/albums/ff267/rabemotorsports/sequential7A.jpg>has a visualizer/gui which is kinda cool but doesnt help calculate injector timing.  I tuned the -60 row with a gunson CO meter in the tailpipe (no cat currently) and got the sequential timing close from idle up to 3krpm.
>Im thinking of making an excel based calculator to help figure out sequential timing (at least ballpark) but i cant find the calculations needed.  the above oocities link is missing intake pressure/vacuum as well as injector distance from the valve.  Can anyone on here point me to calculations, a book on this, or anything else helpful to figure out sequential injection timing?
>Thanks in advance.
>Diy_efi mailing list
>Diy_efi at diy-efi.org
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