Need oddball OEM injector data
Looking for injector data for an oddball OEM injector. The part number is 12587269, used in 2009-2010 in some trucks/SUVs. They are rated at 40 lb/hr @ 58psi. I tried searching, and only found one post with a data file attachment from many years ago, but the data file appears to be corrupted.
Thanks!
https://photos.app.goo.gl/3ojQwEwAkzSfdXPk7
Last edited by c5guy; 10-20-2022 at 03:04 PM.
There are two in the repository. Look up 2009 Silverado 6.0L. One's L76 other is LY6, both use the same injector & injector data. And they're 33.9lb, not 40.
Do you have a source for these being 33.9? Everywhere on the internet, including Summit Racing lists these as 40lb. There were various injectors used in the same vehicles with the same engine, not all LY6 had the same injectors. These were a less common option it seems.Originally Posted by blindsquirrel
If you check out the guide below you can see there are two options listed for the LY6, one being these 12587269.
https://www.wiringspecialties.com/ls...ication-guide/
Last edited by c5guy; 10-20-2022 at 03:55 PM.
See post #6 (maybe)
https://forum.hptuners.com/showthrea...light=12587269
The other injector, 12580681 (a.k.a. 19421333), is a real common 29lb Gen4 injector. I know it's data well, it's what my truck came with. The data in the LY6/L76 files is not that injector.
Lookup by the LY6's VIN (1GCHK53K99F111387)(scroll way way to the bottom):
https://www.gmpartsdirect.com/v-2009...tem-components
From the tune file for the truck that uses the not-12580681 injector, and since there are only two choices and we know which one it's not...
screenshot.20-10-2022 16.16.41.png
2009 Silverado LY6 6.0 E38 1GCHK53K99F111387 (12587269 33.9lb).hpt
Posted while I was typing, and stand by what I said. Dave's file is also 33.9 @ 400kPa delta. Good to get confirmation though.
LY6 EV6 / USCAR
12580681 30 lb/hr @ 58 psi - this is correct
12587269 40 lb/hr @ 58 psi - THIS IS WRONG
Well - I double checked everything you suggested and can't argue. Indeed only two part numbers showing for that VIN, the 29LB/30LB and the oddball. The data you provided from that tune file does not match the 29LB/30LB injector, so it must be these.
These were in an intake I've had for some time, and was planning to use them in my C5, but at 33.9 LB, it isn't worth the cost of the adapters to upgrade over my stock LS1 30LB injectors.
I can't help but wonder why this variant exists, with only the slightest increase over the more common 29LB. It shows up as a special order item from GMPartsDirect.
I appreciate you taking the time to provide input.
Last edited by c5guy; 10-20-2022 at 05:10 PM.
The two numbers have way different body styles...
screenshot.20-10-2022 16.38.09.png
Indeed they do, but they both came on the same year vehicle, with the same engine, the same intake manifold, the same fuel rails, same connector type. I have two dressed intake manifolds with the 12580681 injectors and one with the oddball injectors. I just find it an odd situation and can only hypothesize potential reasons.
I think your first image isn't right, as that injector seems to have a gen 3 style Multec 2 connector instead of the EV6, but otherwise looks the same.
I seem to stumble across posts of yours frequently when browsing the forums, and enjoy learning from them. Thanks again.
Last edited by c5guy; 10-21-2022 at 12:02 AM.
Likely just the wrong picture on Rockauto. The 19421333s from my truck are for sure EV6.
screenshot.21-10-2022 04.26.48.png
I followed your instructions from another post translating the Gen 4 injector Flow Rate tables over to my Gen 3 0411 PCM, as well as Offsets.
Other tables that I noticed differences: "Minimum Injector Pulsewidth" and "Short Pulse Adder"
The minimum injector pulsewidth was pretty simple, but the Short Pulse Adder for the Gen 3 and Gen 4 tune is a bit different.
Gen 3 has a range of -498 to 498 while the Gen 4 is -256 to 256, but all of the data in this table is in decimals less than 1.0. I plugged in the Gen 4 data everywhere that it aligned with the Gen 3 column data and interpolated horizontally between them. The Gen 4 seems to have more resolution here, because any number entered into the Gen 3 table gets rounded up or down to some value close to the original input, but not matching. I attached pictures comparing the two.
Is this acceptable?
Thank you
Last edited by c5guy; 10-24-2022 at 04:24 PM.
I would just use the spreadsheet.
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