I dont think there were significant measuring errors.
Mine is mafless - i was logging dyncylair g/cylinder
The fuel flow meter is accurate to decimal places 2.14

My airflow from dynclair_dma was at 6092rpm 322g/s or 0.88g/cylinder - however this is related to the VE table and my VE table is tuned to the 40psi calibrated SVO30 injector flow rate table. Its tuned so that my desired afrs match my actual afrs.
However in this case the desired afr was 12.96 was 12.3 because it was on the dyno.

Ps. I just read your article its good.

In my case the fuel used was measured well - so its just a matter of duty cycle calculation and my injectors average flow rates. If the DC is correct (measured at the injectors - matching EFIlives log) and then its up to the flow rates in the tune calibration.

But true maybe the injectors vary - but it seems that their average is 34.5 which is fishy because its the max alternate flow rate.

 

So either my flow rates are out or the injectors deviate by that much.

Or my calculations have flaws.

 

1. injctor flows deviate as over +/-5%
2. you ever watch your airflow? it's very jerky and not smooth, there's bound to be error there.
3. spark, ect, iat, humidity, all influence the quality and density of the air charge, thus contributing to power. they're all bound to have some measuring error

so let's say all these things are off by 2% only: so you got 6 factors, that when compounded can create up to 1.02*1.02*1.02*1.02*1.02*1.02=1.126 (12.6% off!) so i'd consider the numbers you've obtained to be quite on the ball.
remember we're observing controlled explosions, while traveling at high speeds--not exactly the easiest to reproduce conditions, so feel free to congratulate yourself for getting as close as you did

 

and one more empirical proof that the svo rating is 43.5psi:
http://redhardsupra.blogspot.com/200...vo-42s-is.html

 

All of the SVO's I have used I have done at 43.5psi. They work great.

 

I tried to provide factual data on page 2 backing up this fact.

Ryan

 

I'll add that regardless if they are 43.5 or 60psi, we still don't have a offset table for them or who to properly calculate one.

 

ChaChing!!! Let me know when we do! Ive been scaling mine and basing it on rich/lean on decel, vs under light power. Im trying to get decel to sync up with normal histograms.

 

I also have the Red top SVO 30's, and am wondering if we can get a clear agreement on what to do as some of this thread covers 42#s.

Basically, can I just plug in the above numbers to the spreadsheet and then input the tables into HPtuners and then start tuning via WB02? The more I read the more confused I get...

 

For both 30 and 42 I would use 43.5psi.

 

so I would plug in these figures into the Injector flow rate vs. KPA VAC table in hp tuners, and I'm done?

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

 

Ok I pasted the numbers in, and now you are saying multiple the entire IFR vs. KPA table by .76 (for the 30lbs)?

 

yeah this **** is confusing as hell.. lol

i just got some racetronix 42's.. they are rated at 42 at like 43 PSI. can somebody give me some cut and dry number to input into HP tuners for these injectors?? i dont have excel on my computer so i cant use the calculator.

even a scaling factor would be cool, but it seems like that is not the correct way to do things.

in most cases i like to understand why im doing something, but after reading all this jibberish in this thread it makes me realize why i was so happy to be out of school

 

Injector Rating - 42psi
Injector PSI - 43psi
Fuel System PSI - 58psi

MAP kPa..........g's/sec..........lb's/hr
0..........6.146100..........48.7794
5..........6.184404..........49.0834
10..........6.222473..........49.3856
15..........6.260310..........49.6859
20..........6.297920..........49.9844
25..........6.335306..........50.2811
30..........6.372473..........50.5761
35..........6.409425..........50.8693
40..........6.446165..........51.1609
45..........6.482696..........51.4509
50..........6.519023..........51.7392
55..........6.555149..........52.0259
60..........6.591076..........52.3111
65..........6.626809..........52.5947
70..........6.662350..........52.8767
75..........6.697703..........53.1573
80..........6.732870..........53.4364

 

I think you meant injector rating- 42 Lbs/Hour

 

how come the injectors PSI is only 43 PSI?? i thought our fuel systems ran 58 PSI @ the rails?

 

thanks a ton dude!

 

These are Ford injectors, or atleast not GM specific. Most injectors are rated at the more common 43# pressure.

 

k now im really confused... so these are different than SVO's???



Delphi/Lucas 42# High Impedence Fuel Injectors
-Static Flow Rate: 42.29 lb/hr @ 43.5PSI
-Static Flow Rate: 48.83 lb/hr @ 58.0PSI
-Dynamic Flow Rate: 9.96 gm/pulse - 2.5ms pulse width and 10ms repetition rate @ 43.5PSI
-Coil Resistance: 15.9 Ohms / High Impedance / High-Z (No ECM driver modifications required)



those are what i have, will. that IFR posted not work correctly for my injectors??

 

OK, so i have excel at work... this is what i got when i plugged in what i think mine should be? ( i plugged in 58 for IRFP, 58 in for FRP, and 48.83 in for IRFR, is that correct?

MAP (kPa) 0 5 10 15 202530354045505560657075 80

Injector Flow (g/sec) 6.15258 6.190924745 6.229033451 6.266910425 6.304559843 6.341985758 6.379192104 6.4161827 6.452961256 6.489531379 6.525896571 6.56206024 6.5980257 6.633796174 6.6693748 6.704764631 6.739968642

Injector Flow (lb/hr) 48.83086114 49.13518988 49.43764526 49.73826147 50.03707164 50.33410795 50.62940161 50.92298295 51.2148814 51.50512559 51.79374332 52.08076163 52.36620682 52.65010447 52.9324795 53.21335613 53.49275797

Injector Flow (lb/min) 0.813847686 0.818919831 0.823960754 0.828971024 0.833951194 0.838901799 0.84382336 0.848716383 0.853581357 0.85841876 0.863229055 0.868012694 0.872770114 0.877501741 0.882207992 0.886889269 0.891545966




do i need to modify these at all??? will the car idle fine or do i need to take out some at lower KPA or anything like that?