LS4 Injector Ohms

[Cringer]

Can anyone tell me what LS4 injectors should measure resistance wise on a DVOM?

[blindsquirrel]

Document ID 1524425.pdf

[Cringer]

Document ID 1524425.pdf

Thank you! I was hoping for something more specific than 11-14 ohm lol.

[blindsquirrel]

Like a compression test, the spread between them is more relevant than hitting a specific exact number. Lots of variables in an ohms test and it's unlikely all 8 in a set will have failed in exactly the same way by the same amount at the same temperature etc

[Cringer]

Like a compression test, the spread between them is more relevant than hitting a specific exact number. Lots of variables in an ohms test and it's unlikely all 8 in a set will have failed in exactly the same way by the same amount at the same temperature etc

The injectors work, I am not testing them for go/no go. I am trying to determine if in fact these actually are LS4 injectors. They are stamped with "0 280 158 xxx". The xxx part has been melted off by the aftermarket injector company.

Using this page, I see several "0 280 158 xxx" matches at the bottom of the list. The first two are in the correct ohm range (as all mine all measure 12.8 - 13.0 ohms), but the 037 and 038 are BMW injectors and they have a very long extended tip, so they are definitely wrong.

From what I can tell LS4's are stamped with "0 280 158 077", but I would like to get the exact ohm reading to see if what I have is actually LS4's are not. All this so I can use the correct injector data for injector temp offset!

[blindsquirrel]

So they not only don't supply data with them, but also deliberately defaced the parts so no one could find legit data on their own? Fuck that. I'd find this company's location and return them, in person, by inserting these injectors into various orifices with a tack hammer. But then I have a lot of free time, YMMV.

[Cringer]

So they not only don't supply data with them, but also deliberately defaced the parts so no one could find legit data on their own? Fuck that. I'd find this company's location and return them, in person, by inserting these injectors into various orifices with a tack hammer. But then I have a lot of free time, YMMV.

LOL well I got them used so no returning. I sent them to Greg Banish for testing and got legit data, except that he does not provide the temp offset data. So just trying to dial in that last piece.

[Alvin]

The injectors work, I am not testing them for go/no go. I am trying to determine if in fact these actually are LS4 injectors. They are stamped with "0 280 158 xxx". The xxx part has been melted off by the aftermarket injector company.

That part number prefix 0 280 158 is just standard bosch injector PN.. The last 3 identify what injector it is.. but so so many bosch injectors start off with that prefix.

I have a sneaky suspicion that these injector companies.. at least in the beginning were just mix matching OEM bosch parts to make what they needed. So this body, this pintle, this nozzle, = a 1000cc??? At that point it makes sense to scratch off the last 3 numbers because it isn't that injector anymore.

But what your seeing isn't unusual.. I've seen that last 3 numbers etched out on MANY sets of injectors from legit companies.

[blindsquirrel]

The LS4 injectors are only 28.3lb-hr, if they're stock.

[Cringer]

That part number prefix 0 280 158 is just standard bosch injector PN.. The last 3 identify what injector it is.. but so so many bosch injectors start off with that prefix.

I have a sneaky suspicion that these injector companies.. at least in the beginning were just mix matching OEM bosch parts to make what they needed. So this body, this pintle, this nozzle, = a 1000cc??? At that point it makes sense to scratch off the last 3 numbers because it isn't that injector anymore.

But what your seeing isn't unusual.. I've seen that last 3 numbers etched out on MANY sets of injectors from legit companies.

I just figured they re-drilled the existing orifices in the cap and/or added new ones. Taking apart the body seems like a one time operation and super high risk for leaks. The internal stuff in there is machined and measured within microns.

[Cringer]

The LS4 injectors are only 28.3lb-hr, if they're stock.

These modified ones flow at 81 lb/hr @ 58 PSI.

[edcmat-l1]

Yeah I believe all they do is either modify or completely remove the cap. No internal work is done. These aftermarket companies aren't at the manufacturing level. Even ID has their injectors made, they don't actually make them themselves.

[blindsquirrel]

How much will the temp offsets change by embiggening a 28lb injector to 81lb, assuming you can work out they started life as LS4s?

[Cringer]

How much will the temp offsets change by embiggening a 28lb injector to 81lb, assuming you can work out they started life as LS4s?

I have no idea, but I assume starting off with the correct temp offset values is the best course of action. I also assume heat physically effects the pintle valve and electrically effects solenoid (rather than the nozzle/orifice openings)...so if my assumption is correct, then I would be near 100% spot on.

[blindsquirrel]

Correct values before whatever was done to them doesn't mean it will also be correct afterwards, don't assume yourself into an even deeper hole.

[edcmat-l1]

How much will the temp offsets change by embiggening a 28lb injector to 81lb, assuming you can work out they started life as LS4s?

LOL I like that. Gotta file that away in the creative Engrish library LOL

[blindsquirrel]

Well, 'enlarging' has connotations of it having been done properly, something I'm not sure applies to most modified injectors out there.

[Cringer]

Well, 'enlarging' has connotations of it having been done properly, something I'm not sure applies to most modified injectors out there.

And what would you have me do? Zero it out?

[Cringer]

LOL I like that. Gotta file that away in the creative Engrish library LOL

He must watch AvE

[Cringer]

That part number prefix 0 280 158 is just standard bosch injector PN.. The last 3 identify what injector it is.. but so so many bosch injectors start off with that prefix.

I have a sneaky suspicion that these injector companies.. at least in the beginning were just mix matching OEM bosch parts to make what they needed. So this body, this pintle, this nozzle, = a 1000cc??? At that point it makes sense to scratch off the last 3 numbers because it isn't that injector anymore.

But what your seeing isn't unusual.. I've seen that last 3 numbers etched out on MANY sets of injectors from legit companies.

So the real question is, what other OEM GM vehicles came with Bosch injectors with the PN "0 280 158 xxx"? All I can find is the LS4? And what do they ohm out at?

Surely there has to be more than the LS4.