# Fueling & Injection - Flow rate of LS7 injectors

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Ramairbird
02-27-2009, 09:04 PM
Looking for this info. at 58PSI. Thanks.

FICINJECTORS
02-27-2009, 09:16 PM
Looking for this info. at 58PSI. Thanks.

if they are part number 0280158049 they are 34lbs.

108dragon
02-27-2009, 09:34 PM
I was under the impression that the LS7 injectors flowed 42 PPH @ 43.5 PSI. That would put them at 55.9 PPH @ 58 PSI.
(new fuel pressure / old fuel pressure) x old flow rate of injector = new flow rate at new fuel pressure.

FICINJECTORS
02-27-2009, 10:05 PM
I was under the impression that the LS7 injectors flowed 42 PPH @ 43.5 PSI. That would put them at 55.9 PPH @ 58 PSI.
(new fuel pressure / old fuel pressure) x old flow rate of injector = new flow rate at new fuel pressure.
thats why i wanted you to check the part number. unless they came from your car. If you bought them there are tons from ls2 being sold as ls7's they look identical. secondly oe injectors are rated at the oe rail pressure. only aftermarket is rated at 3 bar. take a ls1 28.lb its rated at 28 at 58 at 43.5 it flows a bit under 24 . check the part number this is the gm # for the ls7 12576341 it is 42 at 58. and the ls2 is 34 at 58

Ryne @ CMS
02-28-2009, 12:30 AM
thats why i wanted you to check the part number. unless they came from your car. If you bought them there are tons from ls2 being sold as ls7's they look identical. secondly oe injectors are rated at the oe rail pressure. only aftermarket is rated at 3 bar. take a ls1 28.lb its rated at 28 at 58 at 43.5 it flows a bit under 24 . check the part number this is the gm # for the ls7 12576341 it is 42 at 58. and the ls2 is 34 at 58

i wouldnt say identical, the ls7 are about a 1/4" shorter

Mike454SS
02-28-2009, 01:50 PM
I was under the impression that the LS7 injectors flowed 42 PPH @ 43.5 PSI. That would put them at 55.9 PPH @ 58 PSI.
(new fuel pressure / old fuel pressure) x old flow rate of injector = new flow rate at new fuel pressure.

That equation is not correct for the change in flow rate based on the change in fuel pressure. You need the ( square root of (new pressure / old pressure) ) * old flow rate = new flow rate.

108dragon
02-28-2009, 02:30 PM
That equation is not correct for the change in flow rate based on the change in fuel pressure. You need the ( square root of (new pressure / old pressure) ) * old flow rate = new flow rate.

You're right. My mistake. I looked at the equation again, and you are correct.

Ramairbird
02-28-2009, 09:43 PM
Thanks for the help, I checked the part # and they are LS7 injectors.

shoemike
03-07-2009, 10:08 AM
Are you looking to use these with the LS1 PCM?

Haans249
03-12-2009, 08:28 PM
That equation is not correct for the change in flow rate based on the change in fuel pressure. You need the ( square root of (new pressure / old pressure) ) * old flow rate = new flow rate.

regardless they're 42lb's at 58PSI. I can copy over the LS7 injector settings into your LS1 PCM tune file if you need. I'm running them right now and went through the number crunching to get the tune right. Just PM me your EFILive file.

108dragon
03-12-2009, 08:32 PM
regardless they're 42lb's at 58PSI. I can copy over the LS7 injector settings into your LS1 PCM tune file if you need. I'm running them right now and went through the number crunching to get the tune right. Just PM me your EFILive file.

Stock LS7 runs 58 psi?