Injector Flow Rate and tuning?
07-02-2006, 06:58 PM
#1
Injector Flow Rate and tuning? My car runs fine as it is but the injector flow rate is all screwed up. So that means my VE and PE tables are messed up as well. Are there any calculations I can do to figure out a ball park change to the VE/PE tables when I rescale the injector flow rate? Will the new flow rate being numaricly higher lean things out? This is my current table in LB/HR on the left and what it should be on the right. I want to correct the table but am affraid of the conciquenses since the car runs fine as it is.
MV kPa...LB/HR...LB/HR
00.........56.42....69.28
05.........56.79....69.71
10.........52.70....70.14
15.........56.67....70.57
20.........53.82....70.99
25.........53.94....71.41
30.........54.12....71.83
35.........54.68....72.25
40.........54.93....72.66
45.........55.24....73.07
50.........55.80....73.48
55.........55.86....73.89
60.........56.11....74.29
65.........56.42....74.70
70.........56.76....75.10
75.........57.04....75.50
80.........57.35....75.89
What do you guys think?
Brett
MV kPa...LB/HR...LB/HR
00.........56.42....69.28
05.........56.79....69.71
10.........52.70....70.14
15.........56.67....70.57
20.........53.82....70.99
25.........53.94....71.41
30.........54.12....71.83
35.........54.68....72.25
40.........54.93....72.66
45.........55.24....73.07
50.........55.80....73.48
55.........55.86....73.89
60.........56.11....74.29
65.........56.42....74.70
70.........56.76....75.10
75.........57.04....75.50
80.........57.35....75.89
What do you guys think?
Brett
Last edited by Pray; 07-02-2006 at 07:04 PM.
07-02-2006, 07:05 PM
#2
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Geez, what sort of motor are you trying to support with 70 lb injectors???
Calculate the % difference b/w your IFR tables, use that same proportion and apply it to the VE table, you will still need to tidy up here and there....
Calculate the % difference b/w your IFR tables, use that same proportion and apply it to the VE table, you will still need to tidy up here and there....
07-02-2006, 07:15 PM
#3
It's my 02 Z06. Just 6lbs of boost with a cam and exhaust. It made 632rwhp way fat with no timing at 10psi so we toned it down to 6psi with a restrictor plate. Now it is at 550rwhp. The injectors are 60lb Motrons. I assumed that they flow them at 43.5psi. So at 58psi they are a tad larger. Am I adding the percent difference to the table? Sorry for the questions, but the last car I tuned was my 91 Z28. And that was a long time ago.
07-03-2006, 11:05 AM
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i'd verify the rated flow rate on your injectors first, then do your calculation accordingly. Best way to clean up your VE is to adjust based on A/F % error b/w commanded and produced (logged) A/F data. If you believe that your VE is spot on as your IFRs sit right now, whatever % factor your adjust the IFR table by, if you adjust the VE by the same %, it will get you close to a point you can fine tune.
IE: If you increase the IFR table by 10% (effectively leaning the vehicle out 10%), to rebalance your fuel calculation, you would want to increase the VE by a 10% factor (effectively richening up the vehicle 10%) In theory, the changes will cancel each other (in the real world you will most likely need to tidy up a bit), but the objective is to input the correct flow rate of your fuel system, that way your global fueling calculations will help you control all modes of fueling and also help you accurately produce airflow models.
IE: If you increase the IFR table by 10% (effectively leaning the vehicle out 10%), to rebalance your fuel calculation, you would want to increase the VE by a 10% factor (effectively richening up the vehicle 10%) In theory, the changes will cancel each other (in the real world you will most likely need to tidy up a bit), but the objective is to input the correct flow rate of your fuel system, that way your global fueling calculations will help you control all modes of fueling and also help you accurately produce airflow models.