Attachment 473SVO 30 table?
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Attachment 473SVO 30 table?
Did you use the values in the bottom table that are displayed when you first open the sheet. (not edited)
They are radically different from mine. The difference 0 to 80 is much less and many numbers are the same?? Maybe thats a good thing - maybe its not????
I don't have an understanding of how the values affect fueling. I plan on lots of logging to see what happens with any changes made.Quote:
Originally Posted by Flyer
joecar,
I'm being told that the correction is to the IPW and not to only when the injector opens???
Flyer,
The table appears to be okay for getting close. I've made adjustments that you can see in the attachment. You can log GMManifoldVacuum and Battery Volts. Also can set up a Map to match the Correction table row and column and will give you correction factors
Hmmm, interesting.... so this is being added to extend the IPW.
I just tried the set of data that i posted previously - just changing between 11.5 and 14.5V.
The initial impression is that it is maintaining more steady afrs and idling better. It did richen up the mixture everywhere though.
I will now do my VE table to suit the changes and see how things work. It only takes one flash to go back to the normal offsets.
Interesting that i have been trying to go back to closed loop at idle rpm i just turned it back off by making most of my 400-800-1200rpm cells to ask for 14.77 instead of 14.63. It is much smoother in open loop as well.
The lower map cells are the richest. With the difference being about about 2-3% richer at 100map to 8% at 40 map to 11% at 30map.
I am not an expert but it would seem that the injector offset is compensating for the turn on time of the injector. The turn on time is added to the beginning of the commanded pulsewidth. If your injector takes longer to turn on, it must be opened sooner so the fuel is delivered at the correct time. Does this make sense?Quote:
Originally Posted by jfpilla
Also does anyone have a table for 60 lb mototron's???
As I said I really know little about this subject and would like to see some experts chime in. I have talked to a number of more knowledgeable people than I. What I get is that the table is there to compensate for Manifold Vacuum and Battery Voltage changes and affects pulsewidth and not just the opening time. The timing table is there for that reason. We have put in new flow rate numbers for our injectors, but the SVO's have a different operating curve. Whether we are affecting timing or not is not all that critical, what is important is to find the right curve.Quote:
Originally Posted by hpcubed
I've been logging normal daily driving. The cells that get hits are between 11.5 and 14 volts and 35 and 60 Vac. Of those the significant hits are in 13-14 volts and 45-50 Vac. So it's not that hard to find the values that give acceptable trims for cruising. What concerns me is what happens throughout the vacuum range when I go WOT.
I have been trimming my VE table for a few logs now since using the SVO 30 values i posted earlier. It hasnt made as much difference to the 100 MAP area about 3% . But by 50 MAP its about 8%. Then at 25MAP its 25%. In each case that is the % the VE table has been reduced.
Not sure how this stacks up against the change in % of injector pulse width.
Maybe it can be calculated whether the change has helped in terms of the required offset for the injectors. ??
JUst playing with some of the calculations. It seem that at say 1600rpm and 25map if that is indeed -75 manifold and at 13.0 V - the extra length of the pulse should have richened my car by around 28%. So far i have trimmed to 24.5%. But there may be more needed and im not sure how precise the VE cell was pre-offset change ( i can check old logs though).
If the offset is not long enough with the stock settings for the SVO30s - you would expect that some of the pulse width that is needed for fuel will be taken up by the extra time needed to fire the injector. So maybe having enough offset - will cause this to be gained back by needing less trimming - if the settings need less than 28% trimming - the difference may be the true difference in offset??? Maybe ive got it all wrong.
Maybe all that matters is in what happens when the voltage changes. Then maybe things will be more precise ??