Injector impedance and open time

ochizon · Post by **ochizon** » Mon Apr 17, 2006 2:40 pm

I have a set of 550cc high impedance injectors from RC engineering. I had set the open time to 1.0ms. I have been having quite a rough time trying to get my accel settings right. I decided to call RC and ask about the open time for these injectors (dont ask why I waited until after I tuned and ran in to problems to call

) and they say that for high impedance injectors the recommend an open time of 1.2 to 1.4 ms, as a lower open time would make the injectors more "laggy" (a term I would say characterizes my injectors aptly).

My question is does this seem in line with the general wisdom on the subject? and in terms of open time, a range of 1.2-1.4 is pretty wide... should I start at 1.3 and tweak from there????

78Spit1500Fed · Post by **78Spit1500Fed** » Tue Apr 18, 2006 12:41 pm

1.4 ms does seem like a long open time; if you trust that RC Engineering is well versed in injector technology and has indeed measured this particular variable, then set it to what they reccommend.

-Brian

ochizon · Post by **ochizon** » Wed Apr 19, 2006 2:05 pm

78Spit1500Fed wrote: if you trust that RC Engineering is well versed in injector technology

-Brian

That I dont know... I just figured since they built it would be a good place to start.

Anyway, in general, what are the characteristics of a longer open time? Shorter?

I ask because I assume a wrong open time cannot simply be compensated for by tuning, there are performace issues that can only be addressed by finding the correct open time... but what exactly are they???