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Old 07-12-2019, 01:58 PM   #1
Kalebhall
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help!! canít get car to start with bigger injectors

i recently installed id1050x injectors and using ecuflash software to tune for them. i have injector latency and flow scaling all set to the correct numbers. i have been messing with the cranking fuel injector pw trying to get the car to start and it just wonít start. am i missing something
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Old 07-12-2019, 02:24 PM   #2
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Does it crank but just won't fire?

How is the fuel pressure?

Other power mods?


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Old 07-12-2019, 02:32 PM   #3
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got the car to start after having it crank for a while. it idles at 14.7 afr around 1500 rpms then when it drops down to 800 rpms it runs super rich stumbles and shuts off. i had to start from a stock tune due to the last tune being locked by the tuner. fuel pressure is fine i am running a custom turbo kit (cxracing piping) turbo: garret 3076 gen 2 and mishimoto intercooler. along with that this is a built engine by element tuning. just trying to build a base map to get it to my tuner.
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Old 07-12-2019, 02:36 PM   #4
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^^

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Originally Posted by humfrz View Post
Does it crank but just won't fire?

How is the fuel pressure?

Other power mods?


humfrz
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Old 07-12-2019, 04:13 PM   #5
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i still haven t understood yet if you currentlt have a tune fkr the bigger injectors or not, you can t have a stock i jectors tune and pretend it runs right
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Old 07-12-2019, 04:46 PM   #6
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i still haven t understood yet if you currentlt have a tune fkr the bigger injectors or not, you can t have a stock i jectors tune and pretend it runs right
i donít have a tune for these injectors
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Old 07-12-2019, 05:31 PM   #7
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then what you expect? you are injecting for 228cc injectors, that means you are injecting 5x the needed fuel, of course you have problems
you won t get away with it without a tune, during crank and short after it car can run in open loop mostly on port injectors, so either you tune it or you go back to stock injectors, no other way to fix it
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Old 07-12-2019, 05:42 PM   #8
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Originally Posted by tomm.brz View Post
then what you expect? you are injecting for 228cc injectors, that means you are injecting 5x the needed fuel, of course you have problems
you won t get away with it without a tune, during crank and short after it car can run in open loop mostly on port injectors, so either you tune it or you go back to stock injectors, no other way to fix it
i think you misunderstood something, i am tuning for them as of right now. i have the bigger injectors scaled in on ecuflash and the car still stumbles.
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Old 07-12-2019, 05:45 PM   #9
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Originally Posted by tomm.brz View Post
then what you expect? you are injecting for 228cc injectors, that means you are injecting 5x the needed fuel, of course you have problems
you won t get away with it without a tune, during crank and short after it car can run in open loop mostly on port injectors, so either you tune it or you go back to stock injectors, no other way to fix it
just needed to know what else to adjust lol
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Old 07-12-2019, 06:50 PM   #10
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Ok with cranking fueling its a raw pulse width , and its not effected by injector scaler.


So you need to compensate for the bigger injectors.


Also the bigger injectprs take a bit more time to get to full flow in most cases than smaller injectors.


Put all your cranking ipw tables back to stock numbers if you changed them


Locate a table called CRANKING FUEL IPW COMPENSATION RPM
it should be filled with zero ie zero % compensation.


It should be rpm vs temperature

Change this to -70, ie -70% compensation in all cells in table


Note its minus 70



This should get the car starting on petrol with 1050 cc injectors

Last edited by steve99; 07-12-2019 at 07:18 PM.
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Old 07-12-2019, 07:56 PM   #11
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did you change the injectors lag time table to the specific values of your new injectors?
edit: yes you did, sorry
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Old 07-12-2019, 09:10 PM   #12
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thanks @steve99 it started up better this time it still goes super rich when the rpms drop down to 850 though.
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Old 07-12-2019, 10:38 PM   #13
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thanks @steve99 it started up better this time it still goes super rich when the rpms drop down to 850 though.

What scaling did you put in for the 1050 injectors, if you put 1050 thats for 40 psi fuel pressure these cars about 60 so for 1050 you neec to put in about 1260 in the scalar not 1050.


Also in you pi\di ratio tables cold\warm\hot use 100 % direct injection up to loads 0.4 ie put zero in the cells at all rpm up to load 0.4.


Big injectors dont like small pulsewidths
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Old 07-12-2019, 11:28 PM   #14
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Quote:
Originally Posted by steve99 View Post
What scaling did you put in for the 1050 injectors, if you put 1050 thats for 40 psi fuel pressure these cars about 60 so for 1050 you neec to put in about 1260 in the scalar not 1050.


Also in you pi\di ratio tables cold\warm\hot use 100 % direct injection up to loads 0.4 ie put zero in the cells at all rpm up to load 0.4.


Big injectors dont like small pulsewidths
i changed everything to what you said, still same problem. it’s almost like when the car goes into closed loop it won’t correct itself using the sensors. i have my 4 bar map sensor scaled where it should be and my 02 scaled down to read low
the reason i know it goes rich when it dips down is my wideband gauge

Last edited by Kalebhall; 07-12-2019 at 11:40 PM.
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