Is this a correct tuning table for the 42 # Delphi injectors?

Injector Rated Fuel Pressure: 43.5
Your Fuel Rail Pressure: 58
Injector Rated Flow Rate 48.83 - http://www.racetronix.com/621031.html

 

Looks right.

 

doesnt look right to me Doc unless he's running about 70psi of fuel pressure.

 

What are the correct inputs on the table for a 42# Delphi injector then? Any input is apreciated.

Stock fuel pump as well.

 

no one wants to give us the correct settings,also the min and default injector pulse widths are in need of changing or ldle sucks ***

 

So no one on here has tuned these? I thought someone could chime in with their working table?

 

42 Dephi's in my 99
I just changed the table using the spreadsheet like this using EFI.

 

Awesome thanks. The only concern I had was regarding the flow rate which is posted at Static Flow Rate: 48.83 lb/hr @ 58.0PSI (300kPa) or 370gm/min per the company website.

58 PSI is what these cars usally have the fuel rail correct?

 

Bill,
How did you arrive at that? No sarcasm or whatnot. From the racetronix link it said "Static Flow Rate: 48.83 lb/hr @ 58.0PSI (300kPa) or 370gm/min."
So, if you plug in that value in the spreadsheet the aforementioned values correspond the original post. I really would like to know how to use the spreadsheet.
Thanx

 

Yep. That was my question as well. I thought I had inputed the correct flow rate, as it is higher on these cars with the 58 PSI.

 

Furthemore if you want to get deep down into it, if you put a calibrated fuel pressure gage on the end of the rail, or even setup a o/p like Beer has and take the reading at WOT you can get even further accuracy. For example, my Racetronix fuel pump upgraded system, delivers about 60 psi @ WOT.

 

So was I correct with the 58 PSI input (assuming that is the rated PSI when measured at the rail)?

 

in the zip file hes using the wrong rated pressure...he's saying they are rated 48.x@43.5psi where it should actually be 42lb@43.5psi so when he does the calucation it makes it look like he's got ~55lb injectors@58psi...look at beer's post...his numbers look accurate whereas sdbrowns are using the wrong #'s.

 

and i weren't working today, you could do mine and show them the results

 

Static Flow Rate: 42.29 lb/hr @ 43.5PSI (300kPa) or 320gm/min
Static Flow Rate: 48.83 lb/hr @ 58.0PSI (300kPa) or 370gm/min

this, i believe, is a typo--58PSI is 400kPa, not 300...

so going with 48.83@4bar (or 42.29@3bar, same thing), your flow at 4 bar is gonna be 48.83, and that's what your IFR should start with (corresponding to 0kPa vacuum)

 

Alrighty, so Beer has it correct in his above post then?

I should be able to use that table.

 

yes, Beer got it right (he had a good teacher )
however, use the full precision, both in calculating it, as well as copying/pasting into your tuning software. Beer got it on only 1 decimal point, which makes it look like there's no difference in flow between let's say 0 and 10 kPa vacuum, which is just not right. also use precise flow for your injectors (did you get a flowsheet specific to your injectors?) and measured fuel pressure on your rail. this way IFR will represent reality, so calculations made off IFR (which is every single fueling calc) are going to be both precise and meaningful.

 

Now on my stock computer my injector flow rate number goes up the lower the Kpa reading is on according to my file using LS1 edit. Is this not correct ?
Thanks
p.s. I have to tune my car for 42 lb lucas injectors also

 

if i recall correctly, ls1 edit shows IFR in absolute pressure, not vacuum, so it's 'backwards' from the way hpt/efilive does it, so yes, you start with smaller numbers and it goes up numerically.

 

My apologies to all, I used the "EFI Live" version of the sheet as Beer, after I only first looked at the Racetronix data. I now just got back from the hospital and reviewed the whole post just to catch up on things and now see the error that you (Bill) orignally saw. Hope I didn't mislead anyone. Hernia's are a bitch. Regards,
Doc.