320cc RC injectors too big?
12-23-2002, 02:36 PM
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320cc RC injectors too big?
I recently converted my EF to OBD1 with z6 head. I was running OB0 before and i have 320cc RC injectors on. After I converted to OBD1 and still retain the OBD 0 injectors w/ resitor pack, my cars seems to run rich and sluggish now, which never happen to me when i was running OBD1. My question is: 1. Is 320cc too big for people here on their EG on idle? 2. Is there anyone actually running 320cc with no problem. I'm basicly troubleshooting my car and try to pin point the problems. thanks
12-23-2002, 10:25 PM
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Re: 320cc RC injectors too big? (whagkangmakulet)
What kind of mods do you have??? the mini me setup?? turbo???
I personally think its too big for a stock engine with nothing done!!!
Good Luck!!
I personally think its too big for a stock engine with nothing done!!!
Good Luck!!
12-23-2002, 11:08 PM
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Re: 320cc RC injectors too big? (whagkangmakulet)
...Is 320cc too big for people here on their EG on idle?...
<FONT COLOR="blue">What are the biggest injectors I can run? </FONT>
The ECU can be re-calibrated to suit any sized injector (make sure you match injector impedance if you are replacing you injectors). However, injectors take a finite amount of time to open and close, so the bigger injectors tend to be less accurate with their fueling at low durations, such as idle. Much depends on the mechanics of the injector, and how quickly it can open and close. With disk type injectors (such as RC 440cc injectors) you can not tell the difference between stock injectors and injectors which flow twice as much as stock injectors, once the ECU has been reprogrammed for the larger injectors (and there is no difference on the dyno either). With race engines we have run injectors up to 4 times the size of the stock injectors.
<FONT COLOR="blue">How come people say that the biggest injector I can run is 310 cc? </FONT>
This assumes that you are not re-calibrating the ECU to the new injector size. If you don't, the bigger injector will over-fuel. If this happens then the ECU will compensate to some degree using closed loop operation to reduce the injector duration. The limit of the long term closed loop adjustment is about 40%, which is close to the increase in size from stock to 310cc injectors.
The ECU can be re-calibrated to suit any sized injector (make sure you match injector impedance if you are replacing you injectors). However, injectors take a finite amount of time to open and close, so the bigger injectors tend to be less accurate with their fueling at low durations, such as idle. Much depends on the mechanics of the injector, and how quickly it can open and close. With disk type injectors (such as RC 440cc injectors) you can not tell the difference between stock injectors and injectors which flow twice as much as stock injectors, once the ECU has been reprogrammed for the larger injectors (and there is no difference on the dyno either). With race engines we have run injectors up to 4 times the size of the stock injectors.
<FONT COLOR="blue">How come people say that the biggest injector I can run is 310 cc? </FONT>
This assumes that you are not re-calibrating the ECU to the new injector size. If you don't, the bigger injector will over-fuel. If this happens then the ECU will compensate to some degree using closed loop operation to reduce the injector duration. The limit of the long term closed loop adjustment is about 40%, which is close to the increase in size from stock to 310cc injectors.
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