Injector flow rate table - clarification sought
Just wanted to be sure about the injector flow rate table.
It shows injector flow (lbs/h) as a function of manifold vacuum (inHg)
As the vacuum increases the flow inceases because the total pressure
differential across the injector increases (58psi constant from the pump).
It seems that the total injector flow rate is the highest when at idle (23.5inHg) and the lowest at WOT (0 inHg), exactly the reverse of what I would like to have. Also, is 23.5 inHg the max vacuum pressure at closed throttle - that's what it looks like?
You all agree?
Gert
Re: Injector flow rate table - clarification sought
Quote:
Originally Posted by 2000ssnb
Just wanted to be sure about the injector flow rate table.
It shows injector flow (lbs/h) as a function of manifold vacuum (inHg)
As the vacuum increases the flow inceases because the total pressure
differential across the injector increases (58psi constant from the pump).
It seems that the total injector flow rate is the highest when at idle (23.5inHg) and the lowest at WOT (0 inHg), exactly the reverse of what I would like to have. Also, is 23.5 inHg the max vacuum pressure at closed throttle - that's what it looks like?
You all agree?
Gert
Isn't it because lower values increase flow rate?
Hope you don't mind if I ask a question on your thread?
The IFR tables I've see scale from 20 to 100 kPa vs g/s. Why 0 to 80 in EFI?
Another one I don't get. Why kPa or PSI, aren't the Injectors contolled by MAF?
Re: Injector flow rate table - clarification sought
Quote:
Originally Posted by 2000ssnb
Just wanted to be sure about the injector flow rate table.
It shows injector flow (lbs/h) as a function of manifold vacuum (inHg)
As the vacuum increases the flow inceases because the total pressure
differential across the injector increases (58psi constant from the pump).
It seems that the total injector flow rate is the highest when at idle (23.5inHg) and the lowest at WOT (0 inHg),
Correct.
Quote:
Originally Posted by 2000ssnb
exactly the reverse of what I would like to have.
WRONG. Remember that as the numerical value of the IFR decreases the actual flow INCREASES. You want lower IFR values as you get closer to 0 vacuum in the intake manifold.
I think you have it all worked out except the fact that lower IFR values mean more flow and higher IFR values mean less flow. If you look at the tables with that in mind they make perfect since. :)