99 injector upgrade question

[twobit]

Okay im installing some 2002 6.0/5.3 injectors in my 99. What do I need to set the injector flow rate at? Ive seen 3.14, 3.18 etc. Also do I need to change anything else? thx

[farmtruc]

here's some information on injectors,

http://www.ls1truck.com/reference/ls1editt...ning-page2.html



later,

allen

[twobit]

Allen,
Thanks for the info. The injectors I have are from a 02 6.0 Would they be 3.18? thx

[farmtruc]

ya , i just accessed my nieghbors 02 HD with 6L file and his has 3.18 in there,


good luck,

allen

[twobit]

Okay, Im gonna set it at 3.18. Do I also need to change the offset table to match the 02? Thanks.

[farmtruc]

you won't be exaxtly at 3.18 once you do some normal driving becuase you're gonna have to adjust them a tad.

once you have idle ok, do some normal driving, no wot runs, and monitor you ltrims, they should be about -5 to -7,
Positive numbers means your pcm is trying to add fuel, so go ahead and lower the IFR values, if they are too negative raise the values.

so,

to increase fuel = lower the value
to decrease fuel = raise the value

once you have that, then you can adjust your wot settings thru the PE vs RPM table.

if you don't have cats turn the cot test off, if you do, raise the cat settings 100degs.

let me know how it turns out,

allen

[twobit]

Okay, i change the flow rate to 3.18 and the offset tables to match a 00 model.
Now the ltrms are +7 or so at idle. WHen I get on it they fall some but when i decelerate they climb to +15 then gradually fall. Im going to drive it around a few days and see how it does.

[farmtruc]

the correct way to tune for the fuel would be to lower or increase your IFR. Also, you'll want to tune by cell number, at lease most ppl do, so note the cell number your in, along with all other values that determine IFR, and adjust your IFR to make your ltrims negative,

you can try the shotgun approach also, and just scale your IFR table down a little bit, so either multiply your entire table by 90% or subtract a tenth or two , until your ltrims go negatvie.

they are important becuase it determines you WOT a/f ratio, not that you have a reliable wide band to worry about it, but if they are positive they pcm will dump fuel becuae it thinks your're running lean, then you'll be chasing your wot a/f ratio and never get it right.

your 02's should be about .880 also, that is for NA engines, a little richer for NOS setups, so about .900mv.

good luck and keep me updated, i'll be glad to help,


allen

[twobit]

One thing I forgot to mention is that a couple of weeks ago I moved the maf up to the tb and put a cone filter on it. When I flashed the computer tonight its my guess that its trying to re learn that. Thanks for all the help!

[farmtruc]

i have mine near the TB also, it didn't make any difference, at least i couldn't tell.
of course i'm always messing with mine and changine stuff that i may have just overlooked that and fixed it and didn't even know it,

anyway, you should be fine.


good luck,

allen