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Injector Settings

AngryRB

By AngryRB,
in Engines & Forced Induction

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AngryRB Grand Master

AngryRB

Posted
Posted

have installed some 1000cc Xspurts and im confused about the settings,

ive put in 37% correction, and the latency of the injectors is 0.990 at 14Volts and 43.5psi

so does this mean its 0.7-0.990= -.299???

when i put that in the car wouldnt even fire, when i put in 0.18 or 0.30ms it fires and wont idle but very rough, when i tried 1.0ms it was quick to fire and did idle with some throttle but still jumpy and rough...

need some help here. wondering wether theres a massive vacumn leak or if the settings are totally wrong..

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https://www.sau.com.au/forums/topic/406328-injector-settings/
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GTSBoy Grand Master

GTSBoy

Posted
Posted

The 37% correction is for the size of the injectors relative to standard. You do not use that correction when talking about the latency, and you do not refer to the original latency either. You just put in the latency number that they gave you, which is 990 micro seconds, or 0.99 milliseconds. Job done.

AngryRB Grand Master

AngryRB

Posted
  • Author
Posted

the tuner has emailed me that its the new latency - 0.7,

originally with the nismo 555's it was 0.18

so your certain its just put the 0.99 in then? cause its either not right or theres a massive vacumn leak..

GTSBoy Grand Master

GTSBoy

Posted
Posted

So where the hell did the 0.99 number you've been going on about come from?

No. If the latency you have been told is 0.7, then put in 0.7. Do not pay ANY attention to what the old latency was, as it simply doesn't matter. There's no ratio, there's no correction factor. There is just numerical value.

AngryRB Grand Master

AngryRB

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Posted (edited)

the 0.990 comes from the deadtime chart from Injectors Online where i bought them ....thats for 43.5psi and 14volts

As far as i know from reading the forums, the standard latency is 0.7?? and your supposed to use this to calculate the adjusted latency based on the calculation new latency (0.990) minus 0.7 witch would be 0.2990...

I tried this value and it was rough as guts, and i tried 0.990 and it was even worse,

using the 0.990 from the injector chart as you have suggested drenched the plugs... im still thinking wether a vacumn leak is the course or this latency value...

Edited by SliverS2
GTSBoy Grand Master

GTSBoy

Posted
Posted

This is PoweFC yeah?

In which case, I reverse my position on having to do maths. The standard RB25DET injectors have latency of about 0.52 ms. Your new ones are 0.99, yes? So your correction is 0.99 - 0.52 = 0.47 ms. Try that.

I didn't realise you were playing with a PowerFC until I read your sig. Bloody stupid way to set latency if you ask me.

cheers

  • 2 years later...

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