how to choose the right fuel pump for your S2000
03-08-2011, 02:53 PM
#1
Former Sponsor
Thread Starter
how to choose the right fuel pump for your S2000
Choosing the right fuel pump for your S2000 is as important as choosing the correct injector.
Here is some very basic information about choosing the right fuel pump for your S2000.
Most injectors are designed to operate most efficiently at 3 BAR (43.5 PSI). The factory base fuel pressure is 43.5 PSI. A fuel system with a 1:1 fuel pressure regulator will increase the fuel pressure by 1 PSI for every 1 PSI of manifold (boost) pressure to maintain a equalized pressure in the injector. 10 psi of manifold pressure will increase the fuel rail pressure to 53.5 PSI, which will maintain 43.5 PSI in the injector when open (53.5 - 10 = 43.5 PSI). The more manifold pressure, the harder your fuel pump needs to work to maintain 3 BAR of pressure in the injector when open.
Knowing your horsepower goal, and the approximate manifold pressure you need to achieve this goal will help you in choosing your fuel pump and fuel injectors. To determine the fuel flow rate required, a calculator like this from RC Engineering will help. This will tell you what capacity injectors and fuel pump is required. Remember to calculate horsepower by crankshaft horsepower and to factor the correct fuel rail pressure as described above.
example:
We will use a turbocharged 500 bhp 4 cylinder S2000 running 15 PSI of manifold pressure for this example:
actual crankshaft horsepower = 500 bhp
number of injectors = 4
BSFC = .6
maximum duty cycle = .8 (80%)
system fuel pressure = 58.5 (43.5 + 15)
= 853 cc/min or 3,412 cc/min for the entire 4 cylinder engine
Thus, we know that our engine at 80% duty cycle, will require a flow rate of 3,412 cc/min. To convert cc/min to lph, multiply by .06 (205 lph). We suggest multiplying this result by 20% as a safety factor (and the factor that the pump will rarely see 13.5 V). 205 * 1.2 = 246 lph. Looking at our chart, we find that at 58.5 PSI and 246 lph, the Aeromotive 340 HP pump would be the best choice. If another pump, like the Walbro 255 HP pump would be used, either more duty cycle on the injector, a larger injector, or less safety margin would be required.
Choosing the right fuel pump for your S2000 is as important as choosing the correct injector.
Here is some very basic information about choosing the right fuel pump for your S2000.
Most injectors are designed to operate most efficiently at 3 BAR (43.5 PSI). The factory base fuel pressure is 43.5 PSI. A fuel system with a 1:1 fuel pressure regulator will increase the fuel pressure by 1 PSI for every 1 PSI of manifold (boost) pressure to maintain a equalized pressure in the injector. 10 psi of manifold pressure will increase the fuel rail pressure to 53.5 PSI, which will maintain 43.5 PSI in the injector when open (53.5 - 10 = 43.5 PSI). The more manifold pressure, the harder your fuel pump needs to work to maintain 3 BAR of pressure in the injector when open.
Knowing your horsepower goal, and the approximate manifold pressure you need to achieve this goal will help you in choosing your fuel pump and fuel injectors. To determine the fuel flow rate required, a calculator like this from RC Engineering will help. This will tell you what capacity injectors and fuel pump is required. Remember to calculate horsepower by crankshaft horsepower and to factor the correct fuel rail pressure as described above.
example:
We will use a turbocharged 500 bhp 4 cylinder S2000 running 15 PSI of manifold pressure for this example:
actual crankshaft horsepower = 500 bhp
number of injectors = 4
BSFC = .6
maximum duty cycle = .8 (80%)
system fuel pressure = 58.5 (43.5 + 15)
= 853 cc/min or 3,412 cc/min for the entire 4 cylinder engine
Thus, we know that our engine at 80% duty cycle, will require a flow rate of 3,412 cc/min. To convert cc/min to lph, multiply by .06 (205 lph). We suggest multiplying this result by 20% as a safety factor (and the factor that the pump will rarely see 13.5 V). 205 * 1.2 = 246 lph. Looking at our chart, we find that at 58.5 PSI and 246 lph, the Aeromotive 340 HP pump would be the best choice.
There are many assumptions in these calculations, however, they supply enough safety margin to be reliable for safety but accurate enough to insure that you avoid an oversupply situation.
ScienceofSpeed offers these fuel components on our website here:
http://www.scienceofspeed.com/produc...ine_tuning.asp
regards,
-- Chris
Here is some very basic information about choosing the right fuel pump for your S2000.
Most injectors are designed to operate most efficiently at 3 BAR (43.5 PSI). The factory base fuel pressure is 43.5 PSI. A fuel system with a 1:1 fuel pressure regulator will increase the fuel pressure by 1 PSI for every 1 PSI of manifold (boost) pressure to maintain a equalized pressure in the injector. 10 psi of manifold pressure will increase the fuel rail pressure to 53.5 PSI, which will maintain 43.5 PSI in the injector when open (53.5 - 10 = 43.5 PSI). The more manifold pressure, the harder your fuel pump needs to work to maintain 3 BAR of pressure in the injector when open.
Knowing your horsepower goal, and the approximate manifold pressure you need to achieve this goal will help you in choosing your fuel pump and fuel injectors. To determine the fuel flow rate required, a calculator like this from RC Engineering will help. This will tell you what capacity injectors and fuel pump is required. Remember to calculate horsepower by crankshaft horsepower and to factor the correct fuel rail pressure as described above.
example:
We will use a turbocharged 500 bhp 4 cylinder S2000 running 15 PSI of manifold pressure for this example:
actual crankshaft horsepower = 500 bhp
number of injectors = 4
BSFC = .6
maximum duty cycle = .8 (80%)
system fuel pressure = 58.5 (43.5 + 15)
= 853 cc/min or 3,412 cc/min for the entire 4 cylinder engine
Thus, we know that our engine at 80% duty cycle, will require a flow rate of 3,412 cc/min. To convert cc/min to lph, multiply by .06 (205 lph). We suggest multiplying this result by 20% as a safety factor (and the factor that the pump will rarely see 13.5 V). 205 * 1.2 = 246 lph. Looking at our chart, we find that at 58.5 PSI and 246 lph, the Aeromotive 340 HP pump would be the best choice. If another pump, like the Walbro 255 HP pump would be used, either more duty cycle on the injector, a larger injector, or less safety margin would be required.
Choosing the right fuel pump for your S2000 is as important as choosing the correct injector.
Here is some very basic information about choosing the right fuel pump for your S2000.
Most injectors are designed to operate most efficiently at 3 BAR (43.5 PSI). The factory base fuel pressure is 43.5 PSI. A fuel system with a 1:1 fuel pressure regulator will increase the fuel pressure by 1 PSI for every 1 PSI of manifold (boost) pressure to maintain a equalized pressure in the injector. 10 psi of manifold pressure will increase the fuel rail pressure to 53.5 PSI, which will maintain 43.5 PSI in the injector when open (53.5 - 10 = 43.5 PSI). The more manifold pressure, the harder your fuel pump needs to work to maintain 3 BAR of pressure in the injector when open.
Knowing your horsepower goal, and the approximate manifold pressure you need to achieve this goal will help you in choosing your fuel pump and fuel injectors. To determine the fuel flow rate required, a calculator like this from RC Engineering will help. This will tell you what capacity injectors and fuel pump is required. Remember to calculate horsepower by crankshaft horsepower and to factor the correct fuel rail pressure as described above.
example:
We will use a turbocharged 500 bhp 4 cylinder S2000 running 15 PSI of manifold pressure for this example:
actual crankshaft horsepower = 500 bhp
number of injectors = 4
BSFC = .6
maximum duty cycle = .8 (80%)
system fuel pressure = 58.5 (43.5 + 15)
= 853 cc/min or 3,412 cc/min for the entire 4 cylinder engine
Thus, we know that our engine at 80% duty cycle, will require a flow rate of 3,412 cc/min. To convert cc/min to lph, multiply by .06 (205 lph). We suggest multiplying this result by 20% as a safety factor (and the factor that the pump will rarely see 13.5 V). 205 * 1.2 = 246 lph. Looking at our chart, we find that at 58.5 PSI and 246 lph, the Aeromotive 340 HP pump would be the best choice.
There are many assumptions in these calculations, however, they supply enough safety margin to be reliable for safety but accurate enough to insure that you avoid an oversupply situation.
ScienceofSpeed offers these fuel components on our website here:
http://www.scienceofspeed.com/produc...ine_tuning.asp
regards,
-- Chris
03-08-2011, 05:13 PM
#2
good info. what if youre running a high and low boost setting? say for example your high is running at 450hp at 18psi and your low is running at 350 at 10psi. can you still use same fuel pump (for the sake of the argument lets just say the 350aeromotive pump)?
03-08-2011, 05:18 PM
#3
just sold me on the aeromotive pump over the walbro. also, i have ID 1000 injectors for my 08 s2000. can i use my stock fuel rail?
and you guys sell fuel feed/return lines? please PM me, i need some advice on what i need to buy
and you guys sell fuel feed/return lines? please PM me, i need some advice on what i need to buy
03-09-2011, 06:39 AM
#4
Do you mind sharing the details of your PM with us? or maybe Chris can answer for us 06+ dbw guys who need more fuel.........and power haha.
03-09-2011, 10:28 AM
#5
Former Sponsor
Thread Starter
The higher capacity fuel pump won't have any benefit for a returnless car.
We are working on a return fuel system for the 06-09. We expect this to be on the market within 1-2 months. It sounds like this would be the ideal setup for you.
regards,
-- Chris
We are working on a return fuel system for the 06-09. We expect this to be on the market within 1-2 months. It sounds like this would be the ideal setup for you.
regards,
-- Chris
03-09-2011, 10:54 AM
#7
Great news...keep us updated.
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03-09-2011, 12:44 PM
#8
Thanks for the good info Chris!
InlinePro has a return fuel system conversion for '06+.
http://www.inlinepro.com/s1/p-96-06-...el-system.aspx
It would be nice to see what SOS can come up with as well.
MASE says they've tested '06+ with around 425 hp with stock fuel pump and ID 1000's and 500 hp with a Walbro.
Inferring from these formulas:
[note: boost would be 43.5 (3bar) ideal + 10 psi (most common FI) = 53.5 psi]
ID 725's @ 80% duty = 368 hp max | 209 lph @ 100%, 167 lph @ 80% needed
ID 1000's @ 80% duty = 507 hp max | 288 lph @100%, 230 lph @ 80% needed
I think the OEM fuel pump is 190 lph (Denso or Kyosan) so the 1000's are maxed out if skipping the 1.2 safety buffer.
Clearly you do not need a fuel pump upgrade if running 10 psi.
(correct me if my maths are teh wrong)
InlinePro has a return fuel system conversion for '06+.
http://www.inlinepro.com/s1/p-96-06-...el-system.aspx
It would be nice to see what SOS can come up with as well.
MASE says they've tested '06+ with around 425 hp with stock fuel pump and ID 1000's and 500 hp with a Walbro.
Inferring from these formulas:
[note: boost would be 43.5 (3bar) ideal + 10 psi (most common FI) = 53.5 psi]
ID 725's @ 80% duty = 368 hp max | 209 lph @ 100%, 167 lph @ 80% needed
ID 1000's @ 80% duty = 507 hp max | 288 lph @100%, 230 lph @ 80% needed
I think the OEM fuel pump is 190 lph (Denso or Kyosan) so the 1000's are maxed out if skipping the 1.2 safety buffer.
Clearly you do not need a fuel pump upgrade if running 10 psi.
(correct me if my maths are teh wrong)
03-09-2011, 01:33 PM
#9
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03-09-2011, 07:00 PM
#10
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Wow. just got back from my tuner and was told that my 550s are out of fuel on my GReddy at 9psi. Good to know that just a bump to bigger injectors should do the trick without having to spring for a new pump on my 06... unless my pump went bad!
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