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Tuning Help Needed Cobra 39lb Injectors

wa04compg

wa04compg

New member
Just bought some 39lb Cobra injectors and I would like someone to point me in the right direction for tuning info on these...I know I have seen various people on here GPONA and HPT Forum that have ran them just wondering what info was used to set them up...Car has XP cam
 


Just some math should get you pretty close.
BTW those injectors are barely if at all bigger than the factory units.
 
What? I am a noob at tuning and this injector stuff is deff very new to me...wouldn't lb rating increase with fuel pressure?
 
You're correct fuel pressure increase generally leads towards a higher amount of fuel the injector can flow (more lb/hr) like flake said though you won't gain much more headroom on those at the factory rating.
 


33lb to 41.5lb is enough for me to not be over 100% IDC and at $130 for 8 injectors it was the right price...yes not a huge gain in some peoples eyes but a gain none the less
 
^ that's first time I have heard that was under the impression l32 returnless systems where good to 100% maybe a little more...would you suggest 60's then? Car is bolt on xp cam with 3.5 pulley...idc at 6k is 112% 11.7 afr


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I'm return less as well. However fuel system has nothimg to do with max duty cycle. You can go over 80% IDC however its the point at which injectors usually go static and the failure probability factor goes way up. You goal should always be 80% IDC at wot.
 
Nobody has the correct ipw pid definition for 04+ so you are not going to be able to figure out what your idc is. 39s are good for most anything a m90 cam generate for airflow.
 


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