Gh0st

iTrader: (3)

I'm going to put some FAST 36lb hr injectors in, the website says they are rated at 45psi and I understand the LS1 injectors flow at 58psi.

5.149686
5.181781
5.213678
5.245381
5.276893
5.308218
5.339360
5.370321
5.401104
5.431713
5.462151
5.492420
5.522523
5.552463
5.582242
5.611863
5.641329

The reason I ask is because the stock values are all different numbers and these ones are constantly at 5. I used the stickied injector calculator

405HP_Z06

iTrader: (11)

According to Bosch, these injectors flow 35.746 lb/hr @ 3 Bar.
Bosch Flow Data:




Here's the calculation:

Flow rate with Hepatane: 261.1 g/m
Conversion from Hepatane to petrol: 3.5%
Flow rate with petrol (g/m x 1.035): 261.1 x 1.035 = 270.238500 g/m
Convert to g/s (g/m / 60): 270.238500 / 60 = 4.503975 g/s
Convert g/s to lb/hr (g/s * 7.9366479): 4.503975 * 7.9366479 = 35.746463 lb/hr @ 3 Bar

Are you using a referenced or unreferenced fuel pressure regulator? Which tuning software are you using?

Here is the IFR table for EFILive with an unreferenced fuel system:
Assumption: 58 psi (4 Bar) pressure at the fuel rail

odd boy

Gh0st,

your calculation is correct if the rail pressure is 58. FAST website says that they are rated at 45 psi, it is better if you check the rail pressure.

ZL1Killa

iTrader: (17)

whats up with the pressure rating increase they went from 43.5psi to 45psi?? or has it always been like this

405HP_Z06

iTrader: (11)

What at 45 psi?

odd boy

Guys,

look at below link

http://www.fuelairspark.com/Products...ection_468.asp

405HP_Z06

iTrader: (11)

This incorrect! They do NOT flow 36 lb/hr at 45 psi.

Use this to calculate your IFR table on a perfectly tuned engine, swap injectors, log, and then come back and tell me this is correct.

More information concerning the pressure rating for FAST injectors: