brianfromhawaii

iTrader: (3)

i bought 36lb/hr injectors but i dont know what they are at 58 psi? any ideas?

Old Geezer

iTrader: (3)

If they are 36# @ 3 bars, then:
Divide the old op pressure into the new pressure, take the sq root of that, times the old flow rate.
IE: 58/43.5 = 1.333. Sq rt = 1.1547.
1.1547 x 36 = 41.5692 #/hr..

brianfromhawaii

iTrader: (3)

thanks so much!

ZL1Killa

iTrader: (17)

please guys... does no one look at the stickies:

https://ls1tech.com/forums/fueling-injection/293742-fuel-injector-size-calculator-fuel-pump-chart.html


injector lb/hr RATING * (SQRT ( YOUR FUEL PRESSURE / RATED FUEL PRESSURE) )

For EXAMPLE:

an injector is rated 32 lb/hr @43.5psi

your fuel pressure is 60psi

To find out the new lb/hr flow rate the formula is:

32* (SQRT (60 / 43.5) ) = 37.58 lb / hr

odd boy

u need to see what pressure they are rated @, I made some assumptions for u. I hope it won't go out of them:

36 lb/hr at Rated pressure (psi)--------flow (lb/hr) at 58 psi
39.5----------------------------------43.62324314
43.5----------------------------------41.56921938
45.0----------------------------------40.87052728

ZL1Killa

iTrader: (17)

you seriously need to look up and find out what those injectors are rated at, USUALLY they are rated at 3bar (43.5psi)

BadLtBlu99TA

iTrader: (9)

I have a 99 Trans am thou , but is it true that if you start going so high on A fuel injector , does it start to loose voltage , and you need to get a MSD voltage booster , where is the cutoff point , if i got a 42lb injector will i need to get a MSD box ??

405HP_Z06

iTrader: (11)

Please post manufacturer and part number of the injectors on question.

405HP_Z06

iTrader: (11)

If your going to run naturally aspirated you don't need an MSD BAP. Assuming the 42 lb'ers your referencing are high impedance, the factory PCM will support them.

BadLtBlu99TA

iTrader: (9)

F.A.S.T. 36 lb. Fuel Injectors, Emissions-Legal
F.A.S.T. 36 lb. Fuel Injectors, Emissions-Legal, LS1/LS6, Rated at 43 psi Fuel Pressure part # 111-303608

but with the fast i will need the Katech injector spacers since im using LS2 fuel rails and LS2 intake for the mean while

or the

F.A.S.T. 46 lb. Fuel Injectors, For LS2
F.A.S.T. 46 lb. Fuel Injectors, For LS2 Fuel Rail & Harness, Rated at 58 psi Fuel Pressure
More Detail part # 111-30462-8

What do you think ? for my 402cid ??? i dont need the MSD ? i got some 33/lbhr Fast , but there going to be too small i guess so what you think ?

405HP_Z06

iTrader: (11)

As I posted in one of your other threads (https://ls1tech.com/forums/showpost....5&postcount=11), you need 36 or 42 lb/hr injectors for your application. With that said, if you have all LS2 hardware than you are better off with the FAST 46 lb/hr (30462-8). These have the correct connectors and physical dimensions without doing a bunch of conversion.