gtodoug

iTrader: (1)

I was trying to find out a little more info on my recently purchased injector. They are the standard injector supplied by ATI in it's base procharger kit for the GTO. ATI says they are 38lb injectors. They are supposedly the injectors that come stock in the GTP's. They are whiteish grey in color.
I googled them and they came up with a Bosch part #. I did some searching on Bosch and found them listed in a European Bosch motorsport catalog. Here is the link to the page:

http://apps.bosch.com.au/motorsport/...linjectors.pdf

It rates them at 261grams per minute at 3.5 bar. So if my math is right I can take the 261g/min /3.5bar=74.571428. Then 74.571428x4(58psi stock rail pressure)=298.28571g/min. HP tuners has g/sec to lb/hr. calculator so then I can take the 298.28571/60sec=4.9714285g/sec. Plug the 4.9714285g/sec into the conversion calculator in HP tuners and I come up with 39.46lb/hr injectors.

I hope I did all that right. What do you guys think. Bink said in a previous thread...

"Okay, I did a little investigating.........
The GTPs are 38 lb/hr at the GTP fuel pressure of 52 psi. This makes them 40 lb/hr at our 58 psi rail pressure. I then checked this against GM's 2000 ASA tune, Injector Flow Rate table, and the values between 100 kPa and 20 kPa are nearly identical.

I was told previously that these injectors are made by Bosch for AC Delco.

Mine are white body injectors."

So if I came up with 39.46lb per hour vs. his 40lb per hour that's pretty darn close. Just trying to come up with the multiplier for my IFR table.

Bink

Enter New Injector Size Information Below: Legend:
Tested Injector Flow Rate (lbs/hr) 34.507 = Input Cell = Calculated Cell
Tested Injector Duty Cycle (%) 100% 510 * Crank HP (8 Injectors, 80% DC, .50 B.S.F.C) Naturally Aspirated
Injector Test Pressure (PSI) 43.51 425 * Crank HP (8 Injectors, 80% DC, .60 B.S.F.C) Turbo, Blown
New Fuel Pressure to be used (PSI) 58.03 638 Crank HP (8 Injectors, 100% DC, .50 B.S.F.C) Naturally Aspirated
Desired Max Injector Duty Cycle (%) 80% 531 Crank HP (8 Injectors, 100% DC, .60 B.S.F.C) Turbo, Blown
Test Injector LS1 98' F-body * Please Note - Most injectors work best to 80% duty cycle and this is the accepted industry standard

Results:
Injector flows: 34.5070000000 34.51 lb/hr @ 43.51 PSI 100% Duty Cycle
362.6685700000 363 cc/min @ 43.51 PSI 100% Duty Cycle
27.6056000000 27.61 lb/hr @ 43.51 PSI 80% Duty Cycle
290.1348560000 290 cc/min @ 43.51 PSI 80% Duty Cycle
Injector flows: 4.3478820000 4.35 g/sec @ 43.51 PSI 100% Duty Cycle
3.4783056000 3.48 g/sec @ 43.51 PSI 80% Duty Cycle
Injector flows: 39.8509746435 39.85 lb/hr @ 58.03 PSI 100% Duty Cycle
418.8337435034 419 cc/min @ 58.03 PSI 100% Duty Cycle
31.8807797148 31.88 lb/hr @ 58.03 PSI 80% Duty Cycle
335.0669948027 335 cc/min @ 58.03 PSI 80% Duty Cycle
Injector flows: 5.0212228051 5.02 g/sec @ 58.03 PSI 100% Duty Cycle
4.0169782441 4.02 g/sec @ 58.03 PSI 80% Duty Cycle

Enter Your Current Stock LS1Edit Injector Table Below 100% Duty Cycle Reference Sample 98' 28lb F-Body LS1 PCM
KPA 0 5 10 15 20 25 30
3.62 3.64 3.66 3.69 3.71 3.73 3.75
KPA 35 40 45 50 55 60 65
3.77 3.80 3.81 3.84 3.86 3.88 3.90
KPA 70 75 80
3.92 3.95 3.96

New Injector Size Results- Enter into LS1Edit Injector Table 100% Duty Cycle
KPA 0 5 10 15 20 25 30
5.021222805 5.048964368 5.07670593 5.118318274 5.146059836 5.173801399 5.201542961
5.02 5.05 5.08 5.12 5.15 5.17 5.20
KPA 35 40 45 50 55 60 65
5.229284524 5.270896867 5.284767648 5.326379992 5.354121555 5.381863117 5.40960468
5.23 5.27 5.28 5.33 5.35 5.38 5.41
KPA 70 75 80
5.437346242 5.478958586 5.492829367
5.44 5.48 5.49



* ALL results are calculated based on input and may require fine tuning for any specific application.

FWIW.

gtodoug

iTrader: (1)

You da man Bink