TURBHOE

iTrader: (4)

no that is a good ?? becouse i have the marine ones. sorry its been so long since i've even attempted to tune anything its hard to remimber what all i did mine don't see but like 20% max it seems like, becouse my turbo isn't on yet.

02sierraz71_5.3

iTrader: (2)

thanks for the help what I did was to scale the injectors like this based off
Injector Rated Fuel Pressure: 58
Your Fuel Rail Pressure: 58 (this varies so I just took a mean value)
Injector Rated Flow Rate 30

kpa
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80

ifr
30.00052906 30.18750146 30.37332291 30.55801442 30.74159634 30.92408844 31.1055099 31.28587935 31.46521487 31.64353405 31.82085397 31.99719125 32.17256204 32.34698206 32.52046662 32.69303059 32.86468849

at wot it got the inj down to 17.5 ms which is what it is running SD puts me between 85 to 100% duty cycle depending on where I shift which isnt the best but its better than 120% which is what I was at with the stock 5.3 25lbers

this maf is a mother to tune and it reaks havoc on everything else its a saint and a devil at the same time I can run more timing and get better times and mpg with it but its such a PITA to tune anything with it on. My inj pulse width is an example of that.

thanks again for the input

TurboBerserker

iTrader: (1)

If you have a vacuum referenced regulator, *do not* build the curve. The curve is for returnless fuel systems, that do not have a vac ref'd regulator. The VRR makes the same curve when you need it based on vacuum / boost.

02sierraz71_5.3

iTrader: (2)

All late model GM engines have return systems on them, dont they?

TurboBerserker

iTrader: (1)

no, mine doesn't, and if your stock IFR tables have a single value in them, neither does yours.

You can also check to see if there is a vacuum ref'd regulator on your driver's side fuel rail.

AFAIK, trucks went returnless in 04.

TURBHOE

iTrader: (4)

ok i had i bacwards my bad. like i said i'm a long ways from home and haven't even got to drive my truck in two months. i think they went returnless in 03 though becouse i think parish's is returnless also.

TurboBerserker

iTrader: (1)

Mine is an 03 They must have done some returnless, and some return. Weird, but SOP for GM

TURBHOE

iTrader: (4)

this is true. i could be wrong but i could've sworn that he said it was. thats why he got the two big intank pumps instead of the inline. i think we've discussed this before becouse some 03's had it and some didn't

02sierraz71_5.3

iTrader: (2)

the stock values where not scaled they were the same plus there is a vaccume reference line attached to one of the rails. So I set the ifr table to 31 across the board.

Are the 8.1 truck injectors exactly 31 lb/hr?

Some say 30 some say over 31.x