correct injector offsets and specs

anyone happen to know the correct voltage offsets etc for these injectors?

i belive them to be originals from a 85 tpi corvette which should make them 24# injectors. there marked as 80150945 and F1SE-E5 i also belive they are probably the bosch type, i do know that they are pintle type injectors...

now i know that i could just pull up a factory bin for the certain vehicle and look at the voltage offsets but there is the problem, no matter how much i look at the bin the 870 ecm and matching bin does not appear to have that or injector size listed in the bin anywhere i can find(if needed or would help i could list the bin and mask)..

anyhow i know if i looked up another year (after 85 using the 165 ecm)with 24# injectors it would tell me the info i need but the problem there is that 85 was the only year using the 24#, in 86 they went with 22# and far as i know stayed with 22#. also gm used a few diff types of injectors as well after the 85 such as lucas, disc type and a couple others, not all were the pintle type.

any ideas?

Attachment 5113 This is the offset vs battery voltage from HLH bin on 85 TPI vette

ohh nice find but i think HLH is for the late 85 vette which i belive had already changed to the 22# injectors.. someone please correct me if i'm wrong. i would be more specific and give the bin id but it no longer had the original but rather a hypertech chip in it before conversion away from the 870 ecm. from my research it could be an HLP that was original but ya idk.

thanks though i will add this info to my future notes:thumbsup:

this is the offsets used by the hypertech chip in the 85 vette 870 ecm, but no idea how to know the inj size it was using in the bin as they dont seem to list inj size but as you can see its night and day diff from the one you posted.. need to find one that is no doubt from a 85 with the 24# injectors or one that matches the injector part number i guess.

pulled up the 8595 TSB.

part number 16052290 is listed to fix a sag with a cold engine and throttle application. that is the HLH PROM.

it also states all corvettes produced after march 8th of 1985 already have this PROM installed. so if there were an injector change, it doesn't appear to have happened mid-year 1985.

did some more digging, in the 86266 TSB, both 1985 and 1986 replacement injectors have a part number of 10077514, but the 1985 models are also required to increase fuel pressure by using part number 17110874 in place of the original regulator and 17110860 for a "cold start valve".

so, there does appear to be a flowrate change between 85 and 86, but not a mid-year change.

hmm interesting info.. i did know that the 86 and later vettes had a set higher fuel pressure the the 85 and it was indeed for that very reason of having the 24# injectors in the 85(lower factory fp setting) vs the 86's with there 22# injectors(higher factory fp setting).
so you do belive that the HLH would be the correct offsets then? wonder why my searches found the that the offset numbers used by the hypertech chip to be correct.. the bins i looked at so far were all listed on the davis tpi site as
early 85 vette
later 85 vette
stock 85 vette (HLP 2297)personally read by owner of davis site
even one listed as updated 85 vette HLH3200 bin
all have same volt offsets as the hypertech(personally read by me) i listed instead of the ones listed by Jim, hmm odd guess i need to look more places.

thanks for the great info, keep it coming :thumbsup:

lol never mind hahaha me and Jim are in agreement on the numbers as i was reading his table upside down as if it was a table from tunerpro lol :scare:

:laugh:

I hate when that happens! :thumbsup:

just... :tounge: ....thats all i have to say lol

there all fixed :wtg:

LOL, it was read from tunerpro

TP V4?

You can build the XDF parameter either way...

yeah, I just used V4 because that's what is installed on this computer. I don't use this computer for tuning.

well postin tables upside down is jus plain mean....


lol j/k but ya i didnt realise V.4 could arrange them either way.. lesson learned (to pay more attention, look, read and not just glance) :geek:

The '85 engine was different in several ways. One year only cam, different injectors, different ecm, and I was told though never confirmed that it used left over L82 forged rods. I do know that the '85 was always a much snappier car from the factory than the 86-88 models. In 89 GM switched masks and much of the snappiness returned but the '85 always felt like the strongest MAF L98 to me.

Quote:

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Originally Posted by 1project2many

The '85 engine was different in several ways. One year only cam, different injectors, different ecm, and I was told though never confirmed that it used left over L82 forged rods. I do know that the '85 was always a much snappier car from the factory than the 86-88 models. In 89 GM switched masks and much of the snappiness returned but the '85 always felt like the strongest MAF L98 to me.

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yep agreed, i also read that the 85 had trw forged slugs in it, unfortunatly i didnt read that till after my head swap so i didnt check to try and verify..
also along with the bin change in the 89 i belive they did a more aggressive cam change then the 86-88's had.. unshure if it was more or less aggressive then the 85 cam though.