A much clearer explaination:thankyou2: I share your understanding of the purpose of injector offset and how the PCM applies the values to the injector signal.
:banana:
lol I thought just explaining how a magnetic coil worked would help:nixweiss:
Printable View
A much clearer explaination:thankyou2: I share your understanding of the purpose of injector offset and how the PCM applies the values to the injector signal.
:banana:
lol I thought just explaining how a magnetic coil worked would help:nixweiss:
That's fine, your explanation is good :cheers:;Quote:
Originally Posted by MN C5
injector does not react instantly;
the coil has inductance, so it's has finite electrical response (which also depends on applied voltage);
the pintle has mass, spring pressure, FPR/MAP pressure difference across it, so it has finite mechanical response to the electrical response.
This table tries to account for this; but how much do we alter this table when changing injectors...? :nixweiss:
And as Delco said, your alternator/regulator is working within limits [hopefully], so at most you'll ever see is a thin stripe thru this table.
I did actually create a MAP of this table just out of interest and noticed (in my case) that the only columns that were hit were 13.5 and 14 volts.
IFR table is known for the given inj. For this test, I am using the maf so no VE correction. I know what the BEN factors are from using the stock inj which gives the error in either my maf or the stock inj. offset table.Quote:
Originally Posted by Delco
When I put the 60 lb inj in and brought the motor up to 2K it would miss (go lean momentarily). When I richened the mixture in my open loop table I did not see the corresponding decrease in AFR meaning the inj. are not opening soon enough to compensate for the slower 60 lb inj.
The inj. offset table is not only an offset for varying voltages, it is also an offset table for a specific injector. So if you are not using the stock inj. then I think that this table may need adjusting.
These 60 lb inj are rated with an opening time of 1.14 ms @14V. Anyone know what the stock inj. turn on time is or the SVOs? This may give a correspondence to the inj offset table.
Thats the thing, you should get the offset information from a reliable source - either the manufacturer or from a trusted source with the proper testing equipment.Quote:
Originally Posted by Delco
I figured you would be interested in the info. Doing my research, I stumbled on many of your posts from several different forums regarding this topic. I'd like to say thank you for digging up as much info about these as you have. Made my work much easier.Quote:
Originally Posted by redhardsupra
Here you go:
6v - 2.55
7v - 2.55
8v - 1.95
9v - 1.48
10v - 1.14
11v - 0.92
12v - 0.75
13v - 0.64
14v - 0.56
15v - 0.49
16v - 0.13
These numbers came from AEM electronics forum. Apparently they will test any customers injectors that aren't in their database. They then add this info to their EMS products install wizard. Read info here:
http://forum.aempower.com/bbs/viewtopic.php?t=11333
For comparison, at 14volts and 0 vacuum, a C5 has a value of .2887 and the green tops have a value twice the size at .56. The previous "known" value for these SVO injectors was thought to be .78x.
Richard
Edit...Never mind...
http://www.bjacked.net/LuvToHunt/for...Dead_Horse.jpg
jfpilla - Any more results?
This is from a while ago but it worked for me:
LABELS Battery Volts {link: GM.VOLTS}
Manifold Vacuum kPa {link: GM.MANVAC} 11.5 12.0 12.5 13.0 13.5 14.0 14.5
0 1.109418 1.033431 0.957443 0.896653 0.835863 0.790270 0.744678
5 1.185406 1.033431 0.987838 0.972641 0.927048 0.942246 0.805468
10 1.185406 1.033431 1.003036 0.972641 0.942246 0.942246 0.835863
15 1.170208 1.033431 1.003036 1.003036 0.942246 0.972641 0.835863
20 1.139813 1.048628 1.003036 1.003036 0.972641 0.972641 0.881456
25 1.200603 1.048628 1.033431 1.003036 0.972641 0.972641 0.881456
30 1.200603 1.079023 1.033431 1.018233 0.972641 1.003036 0.881456
35 1.230998 1.079023 1.048628 1.018233 0.972641 1.003036 0.881456
40 1.155011 1.094221 1.048628 1.018233 1.003036 1.003036 0.881456
45 1.230998 1.094221 1.048628 1.018233 0.972641 1.003036 0.881456
50 1.230998 1.094221 1.048628 1.018233 0.972641 0.896653 0.881456
55 1.230998 1.079023 1.048628 1.018233 0.972641 0.972641 0.835863
60 1.155011 1.079023 1.033431 1.003036 0.972641 0.972641 0.835863
65 1.230998 1.079023 1.033431 1.018233 0.972641 0.972641 0.835863
70 1.246196 1.094221 1.048628 1.018233 0.972641 0.972641 0.835863
75 1.246196 1.094221 1.048628 1.018233 0.972641 0.972641 0.835863
80 1.185406 1.094221 1.048628 1.018233 0.972641 0.972641 0.835863
LABELS Injector Flow Rate (Lbs/Hour)
Manifold Vacuum inHg {link: SAE.MANVAC} Value
0.0 36.954888
1.5 37.202908
3.0 37.450927
4.4 37.636942
5.9 37.884961
7.4 38.194985
8.9 38.318995
10.3 38.629019
11.8 38.753029
13.3 39.063053
14.8 39.187063
16.2 39.497087
17.7 39.621097
19.2 39.931121
20.7 40.055131
22.1 40.365155
23.6 40.489164
LABELS MAF Sensor Calibration (Lbs/Minute)
Hz {link: GM.MAFFREQ} Value
1500 0.188081
1625 0.232518
1750 0.277988
1875 0.327592
2000 0.378230
2125 0.430934
2250 0.489838
2375 0.552877
2500 0.623149
2625 0.702722
2750 0.789528
2875 0.883569
3000 0.982777
3125 1.088185
3250 1.200827
3375 1.318636
3500 1.442646
3625 1.578023
3750 1.725802
3875 1.888048
4000 2.062695
4125 2.245609
4250 2.442991
4375 2.651741
4500 2.872891
4625 3.105409
4750 3.352395
4875 3.608682
5000 3.881503
5125 4.163625
5250 4.463315
5375 4.776440
5500 5.108166
5625 5.462627
5750 5.842923
5875 6.243888
6000 6.666554
6125 7.112989
6250 7.579059
6375 8.069931
6500 8.582504
6625 9.114712
6750 9.671723
6875 10.247334
7000 10.842581
7125 11.459529
7250 12.097145
7375 12.755430
7500 13.438517
7625 14.140205
7750 14.862562
7875 15.609720
8000 16.379613
8125 17.175342
8250 17.995873
8375 18.846373
8500 19.724775
8625 20.632113
8750 21.569419
8875 22.537728
9000 23.534973
9125 24.564253
9250 25.625569
9375 26.718922
9500 27.847410
9625 29.007934
9750 30.204627
9875 31.434390
10000 32.702389
10125 34.003458
10250 35.338629
10375 36.715136
10500 38.128847
10625 39.583894
10750 41.078210
10875 42.620064
11000 44.201188
11125 45.832949
11250 47.508113
11375 49.235981
11500 51.013454
11625 52.845697
11750 54.732711
11875 56.674496
12000 58.678286
Worked for me in the past, but that was a while ago... will let you know if still valid this spring. 32lb Accel injectors. I haven't had much of a chance to play with it over a year+ so these are only for information purposes.
HPQuote:
Originally Posted by hpcubed
Mine are 30lb SVO's and I'm finding the table slopes opposite of the stock table. Your big Injectors are probably more extreme.
You make, I think, a good point about needing adjusting for different injectors. If we install injectors that require a different offset table and we don't adjust the IOS then aren't we in affect keeping an incorrect offset table or am I off base?
Joe?
i think you're completely on the money. if it's not perfect, it's wrong :)
so what i'm thinking to eliminate the posibilities of screwing up is to install a fuel regulator that will keep it perfectly flat. this way the whole table looks like the static value, which is one of the few pieces of data we actaully get with the injectors.
is this a proper 'runaround/possible problem eliminator' for something like this?