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06-05-2014
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
06-05-2014
Just some math should get you pretty close.
BTW those injectors are barely if at all bigger than the factory units.
06-05-2014
39lb rating is 39.5 psi so at our higher fuel pressure should actually flow pretty good
06-05-2014
Injectors are rated at the same pressure though.
06-05-2014
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?
06-05-2014
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.
06-05-2014
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
06-06-2014
80% is what you need to not go over
06-06-2014
^ 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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06-06-2014
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.
06-06-2014
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.
06-06-2014
Thanx DH!
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