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injector sizing

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92tsi123

Probationary Member
25
0
Oct 28, 2004
aurora, Illinois
on a 1g with a 60 trim would 780cc injectors be a good size.
i use a 2g maf
i use a safc2
what would the fuel setting look like, high or low?

im just looking for ballpark ansers.
 
I have pretty much the same stuff you have(pte 60 trim 750's 2 gmaf and safc) and my 750's would be at about 65-70% duty cycle at 24 psi. So you should be ok, however I would definitely recommend getting a chip to compensate for the bigger injectors, it makes tuning a hell of a lot easier. Also make sure that you have rewired your fuel pump becuase with the stock wiring the fuel pump will never see 12v and will not be pumping anywhere near enough fuel to keep up with that 60 trim.
 
about the 65-70% duty cycle, is that a setting in the safc, is it the th-point?

and the re wiring of the fuel pump, how is that done?
 
duty cycle is the % on time for the injector. 0% would mean it's always closed, 50% means it's open 50% of the time, and 100% would mean it's running max capacity. This is gives you an idea of how close you are to maxing the injectors out(which isn't a good idea).

www.vfaq.com has a decent write up on fuel pump rewire. Also ebay usually has kits for cheap.
 
so where do i control duty cycle, isnt that programed into the ecu?

can i change it in the safc?
 
so where do i control duty cycle, isnt that programed into the ecu?
 
you would have to have a stand alone to control duty cycle, right.


i see your broke the 13s canadian, wow. that sucks.
"i cant even rewire a fuel pump but", i sure as hell figured out how to get my car to run better than a 12.9
 
it was a question, some one was saying what thier duty cycle was and i asked them how they knew that and adjusted it.
 
To my understanding injector duty cycle is set by the size of the injector, amount of boost, fuel pressure-not by the user. mark
 
92tsi123 said:
you would have to have a stand alone to control duty cycle, right.


i see your broke the 13s canadian, wow. that sucks.
"i cant even rewire a fuel pump but", i sure as hell figured out how to get my car to run better than a 12.9
Click to expand...

So lets see a slip of what your car runs on pump gas...
 
Yes it is set by the ECU using the info from the items I listed, correct. 550's might have an 80% duty cycle. Change to 720cc inj's and the duty cycle drops. Mark
 
92tsi123 said:
i see your broke the 13s canadian, wow. that sucks.
"i cant even rewire a fuel pump but", i sure as hell figured out how to get my car to run better than a 12.9
Click to expand...

Don't say that. Maybe he wants 13s and thinks that this is fast enough.

" No Insults and/or name calling - this can get you banned without warning - we don't care how experienced or knowledgable you are, don't be a smart ass!"

Read the red text right before posting.
 
Injector Duty Cyle is determined by the percentage of work your injectors are doing (how much fuel they are flowing) , IDC's are not controlled by the ECU, but I'm sure you would have a good chance of fuel cut with any IDC's over 100%


:thumb:

~ everyone already beat me to it.
 
its in my ass, you will have to get it out with your tounge. haha.
who gives a shit, im a street racer, not a track racer. i have never been to the track. i only know how fast my car is to camparison to other cars.

i have a larger fuel pump jack ass, you assumed that i am stupid, and some times i am, but, thats not the point. i have never herd of rewiring a fuel pump, so i was interested becasue i thought i would do it to mine.
 
the only way the injector duty cycle would change as if the ecu was programed to work with the new injector.

you could change injectors all day long, but the computer does not know that. it will think they are all the same.
 
hey, what determins that. ummmm. the ecu, yeah, thats it


DSMfânâtic said:
Injector Duty Cyle is determined by the percentage of work your injectors are doing (how much fuel they are flowing) , IDC's are not controlled by the ECU, but I'm sure you would have a good chance of fuel cut with any IDC's over 100%
Click to expand...
 
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