F Injector controll question brad? kevin? - Saab Performance Bulletin Board - Saabnet.com
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F Injector controll question brad? kevin?
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Posted by jak [Email] (#195) [Profile/Gallery] (more from jak) on Tue, 24 Dec 2002 10:05:59 Share Post by Email
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this question is reguarding the VOLVO low impedance injs with the resister pack VS high impedance injectors.
what Im finding is that with the FPR set at 27PSI vac conected at idle watching my o2 staticaly at 2500 rpm or higher the ecu struggles to maintain closed loop it runns on the rich side.8V & the o2 dips down to .5V instead of swinging say from .3-.7V also I see jaged waveform like a miss but I believe it to be the injectors opening & closing that I see within the normal swing under moderate load it trys to maintain stoich roughly but dosent swing like Im used to seeing & than at even 7PSI boost the o2 pinns up to .8V or higher depending on boost/airflow I will go further to say that
running lower FP below 22PSI idle W/vac results in a leanout above 4800 rpm my o2 response time from .15V-85V is around 50MS which is pretty darn good

so my question is.
if volvo 2.2 LH uses #30 injs rated at 3 bar there flow at a given dutycycle would be the same as the high impedance #30s what Im wondering is if the low impedance injs with the resisters are somehow more controllable electricaly?
there must be a diference? what exactly is it?

my other question is at around 5500 rpm I get the feeling that my spark breaks up a lil than seems to clear up above 5700 rpm I wish I had a dyno here so I could run full boost ignition tests at 5500 rpm:-)
I think Im gona dyno the animal mext week
thanks again
JAK

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