What's a good PE scale factor for 10.5 AFR
06-30-2005, 09:40 AM
#1
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What's a good PE scale factor for 10.5 AFR I finally got the SVO 30 lb injectors installed and scaled the IFR at 138%.
Drove for about an hour last night then plugged in the scanner. The LTFT's are pretty close at 2 or 4. I may lean that out 1%. At WOT my wideband is reading 10.5. The PE table is stock. How much should I scale that down, 90%, 85%, 92%
I don't have a good point of reference to start at. Anyone with experience at this have a good idea for a starting scale factor???
Thanks
Drove for about an hour last night then plugged in the scanner. The LTFT's are pretty close at 2 or 4. I may lean that out 1%. At WOT my wideband is reading 10.5. The PE table is stock. How much should I scale that down, 90%, 85%, 92%
I don't have a good point of reference to start at. Anyone with experience at this have a good idea for a starting scale factor???
Thanks
06-30-2005, 09:55 AM
#3
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If the 30 lbs are flowed at 43.5 psi here is the correct IFR table
Code:
MAP (kPa) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Injector Flow (g/sec) 4.364768035 4.391970593 4.419005701 4.445876413 4.472585692 4.499136414 4.525531368 4.551773265 4.577864737 4.603808341 4.629606564 4.655261822 4.680776466 4.706152783 4.731392999 4.756499281 4.781473737 Injector Flow (lb/hr) 34.64162706 34.85752419 35.07209232 35.2853557 35.49733784 35.70806157 35.91754903 36.12582173 36.33290055 36.5388058 36.74355721 36.94717396 37.14967471 37.3510776 37.55140031 37.75066003 37.9488735 Injector Flow (lb/min) 0.577360451 0.580958736 0.584534872 0.588089262 0.591622297 0.595134359 0.598625817 0.602097029 0.605548343 0.608980097 0.61239262 0.615786233 0.619161245 0.62251796 0.625856672 0.629177667 0.632481225
06-30-2005, 10:49 AM
#4
You'll need to lower your PE table by -close- to 38% to get it back in line where it was before. 1% is pretty close to .1 on the AFR. So 10.5 - 12.5 is 20% right there. Work in increments until you get it close. I'd do 20% first and see where your at.
06-30-2005, 10:54 AM
#5
I don't think scaling your PE table is the right answer...the PE table is nothing more than a multiplier that adds extra fuel. 14.62/PE value gives what the PCM is commanding the car to do A/F ratio-wise at WOT. So if it is commanding 13.0, and you aren't seeing 13.0 (for example only), then you have problems elsewhere (like your Open loop A/F ratio table or your MAF perhaps). Start with the IFR table first though...if that isn't right, you'll be chasing your tail for hours.
06-30-2005, 01:57 PM
#7
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40 psi
Code:
MAP (kPa) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Injector Flow (g/sec) 4.551722751 4.580090468 4.608283562 4.636305218 4.664158527 4.691846487 4.719372008 4.746737916 4.773946956 4.801001794 4.827905024 4.854659165 4.88126667 4.907729923 4.934051245 4.960232896 4.986277075 Injector Flow (lb/hr) 36.12542081 36.35056539 36.57432405 36.79672207 37.01778398 37.23753357 37.45599394 37.67318751 37.88913608 38.10386081 38.31738227 38.52972047 38.74089487 38.95092439 39.15982745 39.367622 39.57432548 Injector Flow (lb/min) 0.602090347 0.605842757 0.609572068 0.613278701 0.616963066 0.62062556 0.624266566 0.627886459 0.631485601 0.635064347 0.638623038 0.642162008 0.645681581 0.649182073 0.652663791 0.656127033 0.659572091
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07-01-2005, 12:33 AM
#8
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HumpinSS has the numbers that I used for the IFR. The 30 lb SVO are rated at 40 psi according to the sticky on the Fueling page. So they flow 36.12 on a C5, 36/26=138%.
I was happy to see 4 or 2 for LTFT, I thought that was pretty close, so I may change the IFR by 1 or 2% to try to hit 0.
I'll try the 20 %factor for the PE, good call from 1FastWS6, the bigger injectors have scaled up the PE, that's why it went way rich.
This LS6 is going to haul when I get these numbers right.
I was happy to see 4 or 2 for LTFT, I thought that was pretty close, so I may change the IFR by 1 or 2% to try to hit 0.
I'll try the 20 %factor for the PE, good call from 1FastWS6, the bigger injectors have scaled up the PE, that's why it went way rich.
This LS6 is going to haul when I get these numbers right.
