Tip:Calculate new injector flow based on pressure increase

dudemaaan · 08-26-2009, 11:18 PM

So you know an injector flows 550cc at 40 psi, now you want to know how much it flows at 50 or 60 psi. This simple formula will allow you to calculate it quickly. Works for aux injection systems, fuel injection systems, hell it will even work on your sewer system if you really cared to know.

SQRT(New Pressure / Old Pressure) X Old Flow Rate= New Flow

We'll use the above 550cc @ 40psi base pressure as an example.
example: New pressure = 50psi, old pressure = 40 psi, old flow rate = 550cc

So hit square root on your calculator, enter 50 divided by 40, then multiply times 550= 687cc <---- this is your new flow

Garfinkles Motor Works · 08-28-2009, 09:55 PM

Good info ,thanks

Garfinkles Motor Works · 09-06-2009, 10:55 AM

I need to see a fuel calculator ,what size injector ,injectors, for x amount of power .Do you have one ?

dudemaaan · 09-06-2009, 01:09 PM

yeah this is the one I like to use.

http://www.maxcooper.com/rx7/how-to/...tem/calcs.html

Garfinkles Motor Works · 09-06-2009, 09:10 PM

Thank you for your time .

prrex4ever · 09-07-2009, 05:39 PM

Great info, thanks. I will keep this for future use.

dudemaaan · 09-08-2009, 02:42 PM

No problem. I use the formula all the time
Here is another great link, shows flow graphs for a lot of popular pumps both stock and after-market.

http://www.stealth316.com/2-fuelpumpguide.htm

Here is one of many graphs as an example.

05rex8 · 09-08-2009, 07:11 PM

found this site to be really helpful

http://kgparts.com/index.php?page=fuel-calc

TimeMachine · 09-14-2009, 01:00 PM

I occasionally use this one as well:

http://www.rceng.com/technical.aspx#WORKSHEET

08-26-2009, 11:18 PM	#1
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX Posts: 335 Rep Power: 18	Tip:Calculate new injector flow based on pressure increase So you know an injector flows 550cc at 40 psi, now you want to know how much it flows at 50 or 60 psi. This simple formula will allow you to calculate it quickly. Works for aux injection systems, fuel injection systems, hell it will even work on your sewer system if you really cared to know. SQRT(New Pressure / Old Pressure) X Old Flow Rate= New Flow We'll use the above 550cc @ 40psi base pressure as an example. example: New pressure = 50psi, old pressure = 40 psi, old flow rate = 550cc So hit square root on your calculator, enter 50 divided by 40, then multiply times 550= 687cc <---- this is your new flow __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap!

09-06-2009, 01:09 PM	#4
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX Posts: 335 Rep Power: 18	yeah this is the one I like to use. http://www.maxcooper.com/rx7/how-to/...tem/calcs.html __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap!

09-08-2009, 02:42 PM	#7
dudemaaan Rotary Fanatic Join Date: Mar 2008 Location: Brenham, TX Posts: 335 Rep Power: 18	No problem. I use the formula all the time Here is another great link, shows flow graphs for a lot of popular pumps both stock and after-market. http://www.stealth316.com/2-fuelpumpguide.htm Here is one of many graphs as an example. __________________ 500+ HP thanks to: Fast reacting IAT sensor thread! Mechanical Pre-turbo Water Injection Thread Dual Stock fuel pumps Thread T2 differential swap! Last edited by dudemaaan; 09-08-2009 at 02:53 PM.

09-08-2009, 07:11 PM	#8
05rex8 Turbo 8 Join Date: Oct 2008 Posts: 131 Rep Power: 18	found this site to be really helpful http://kgparts.com/index.php?page=fuel-calc __________________

09-14-2009, 01:00 PM	#9
TimeMachine The Newbie Join Date: Sep 2009 Posts: 7 Rep Power: 0	I occasionally use this one as well: http://www.rceng.com/technical.aspx#WORKSHEET __________________ 1995 Mazda RX-7 2006 Infiniti FX35

08-28-2009, 09:55 PM	#2
Garfinkles Motor Works RCC Contributor Join Date: Mar 2008 Posts: 535 Rep Power: 18	Good info ,thanks

09-06-2009, 10:55 AM	#3
Garfinkles Motor Works RCC Contributor Join Date: Mar 2008 Posts: 535 Rep Power: 18	I need to see a fuel calculator ,what size injector ,injectors, for x amount of power .Do you have one ?

09-06-2009, 09:10 PM	#5
Garfinkles Motor Works RCC Contributor Join Date: Mar 2008 Posts: 535 Rep Power: 18	Thank you for your time .

09-07-2009, 05:39 PM	#6
prrex4ever Rotary Fanatic Join Date: Oct 2008 Posts: 274 Rep Power: 18	Great info, thanks. I will keep this for future use.