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Scaling Injectors?
Heres the issue, I had a tuner send to me injectors, I ordered 42lbers. I scaled my Injector Flow Rate {B4001} accordingly however at idle I was maxed +25 LTFT with the following
LABELS Injector Flow Rate (Lbs/Hour)
Manifold Vacuum inHg Value
0.0 42.659334
1.5 42.969358
3.0 43.279383
4.4 43.465397
5.9 43.775421
7.4 44.085446
8.9 44.271460
10.3 44.581484
11.8 44.767499
13.3 45.077523
14.8 45.263538
16.2 45.573562
17.7 45.759576
19.2 46.069601
20.7 46.255615
22.1 46.565639
23.6 46.751654
Too get the LTFT at idle in check I scaled them back to the following.
LABELS Injector Flow Rate (Lbs/Hour)
Manifold Vacuum inHg Value
0.0 32.614549
1.5 32.862568
3.0 33.110588
4.4 33.234597
5.9 33.482617
7.4 33.730636
8.9 33.854646
10.3 34.102665
11.8 34.226675
13.3 34.474694
14.8 34.598704
16.2 34.846723
17.7 35.032738
19.2 35.218753
20.7 35.404767
22.1 35.652786
23.6 35.776796
I am just not certain what injectors they sent me, and they can't remember anymore what they shipped. I looked at a bunch of tunes from HP Repository and it looks like all 42lb injectors are in the 44-49INHG
Is there anyway to tell what injectors I have? Whats the proper way to scale IFR {B4001} if you don't know what flow rate they are? By LTFT's at idle? Any help or links are appreciated.
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Is it possible that your fuel pressure is higher than the pressure specified for the injectors?
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That is definitely a possibility, but I don't know that for 100% certain.
What is the best way to go for scaling the injector flow rate?
Do what I did and just scale them till ltft's are 0 to -1 at idle?
Just say my fuel pressure is higher than the injectors were tested at, it made my scale lower, shouldn't it make it higher?
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you dont scale them, you calculate them. go to pcm section on ls1tech and in the stickies there's a spreadsheet that will give it to you right. i've done over a dozen of cars with it, and it works perfect.
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RedHardSupra,
That is how I came up with my original figures in the first table. I used the excel table that was modified by you. Attached are some pictures that I found of the injectors and a sheet that came with them. I have a Corvette C5 2000.
http://www.easiwebsites.com/injectors/DSC00145.gif
http://www.easiwebsites.com/injectors/DSC00148.gif
http://www.easiwebsites.com/injectors/DSC00149.gif
http://www.easiwebsites.com/injectors/DSC00150.gif
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Well, you just posted the problem. Those injectors are flowed at 43.5psi and I believe LS1's run 58psi (4bar). See http://www.ls1tech.com/forums/showthread.php?t=326601 for more info.
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vetteboy2k - Email me your tune w/ a complete list of mods and I'll setup tables over the weekend for you. It's not just one injector table that you need to modify.
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Doing some more research, I found the part number of my injector.
Part # 01D030B
It's a Lucas based fuel Injector flowing 440cc@3Bar. Using a Calculator for cc->lbs
440cc=41.904761904761905lb's
Then calculating flow rate @43.5psi -> 58psi
41.904761904761905=48.387451132082916
So basically I have 48lb injectors.
What doen't make sense to me is that the figures I entered into {B4001} were for 42lbs, and it was showing an extremely lean condition at Idle (pegged at +25 LTFT's). I can recalculate my injector numbers, but what other table do I need to change so that everything is scaled accordingly?
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Recal {B4001} my table looks like the following
LABELS Injector Flow Rate (Grams/Second)
Manifold Vacuum kPa Value
0 6.096126
5 6.134119
10 6.171878
15 6.209407
20 6.246711
25 6.283794
30 6.320659
35 6.357310
40 6.393751
45 6.429986
50 6.466017
55 6.501849
60 6.537484
65 6.572927
70 6.608179
75 6.643244
80 6.678125
I will post back later today what my ltft's look like at idle this time around.