Injector size?
Joined: Mar 2010
Posts: 229
Likes: 0
From: Rochester Hills, MI, 48309
Re: Injector size?
Injector sizing is very precise. You don't want to max out the duty cycle and on the other end of the spectrum you don't want to go with injectors that are too big. In both cases you are not getting the optimum amount of performance out of the injectors.
But yes, we do need to know atleast what your power goals are and what engine management you'll be using.
Honda-Tech Member
Joined: May 2002
Posts: 15,814
Likes: 8
From: Dallas, TX, USA
Re: Injector size?
Check out www.injectordynamics.com
The ID725 is perfect for your goals, and is high impedance so it will work properly with any ecu. On an H22 they'll be good for 375-425whp, so you'll have plenty of headroom.
The ID725 is perfect for your goals, and is high impedance so it will work properly with any ecu. On an H22 they'll be good for 375-425whp, so you'll have plenty of headroom.
Honda-Tech Member
Joined: May 2002
Posts: 15,814
Likes: 8
From: Dallas, TX, USA
Re: Injector size?
When an injector is 'too big', you suffer from poor atomization and operating in the non linear range of the fuel injector.
As you can see in this graph, the linear flow of the ID725 at 40psi fuel pressure goes down to almost nothing. A typical Honda uses around 70-90cc/min at idle, which as you can see is well within the linear operating range.
I can guarantee you the ID725 has better atomization than any of the other injectors you're considering. Something else to consider, Noble is using the ID725's in their new production car, the M600. The M600 is a V8 that makes 650bhp, which would be the same as a 4 cylinder making 325bhp, pretty similar to your goals, no? Also keep in mind that production road vehicles like the M600 have very strict emissions guidelines that must be met, something that is not possible without good injectors.
http://www.noblecars.com/m600/m600.html
When comparing injectors, you should be looking at the details about the injectors themselves, not only the flow rating. There is a HUGE range of performance/quality in fuel injectors, static flow rating being the only thing standard to be compared from one injector to the next.
Everything you could ever want to know about the ID725 is on that page. Ask for similar information from the other manufacturers and see how things compare.
As you can see in this graph, the linear flow of the ID725 at 40psi fuel pressure goes down to almost nothing. A typical Honda uses around 70-90cc/min at idle, which as you can see is well within the linear operating range.
I can guarantee you the ID725 has better atomization than any of the other injectors you're considering. Something else to consider, Noble is using the ID725's in their new production car, the M600. The M600 is a V8 that makes 650bhp, which would be the same as a 4 cylinder making 325bhp, pretty similar to your goals, no? Also keep in mind that production road vehicles like the M600 have very strict emissions guidelines that must be met, something that is not possible without good injectors.
http://www.noblecars.com/m600/m600.html
When comparing injectors, you should be looking at the details about the injectors themselves, not only the flow rating. There is a HUGE range of performance/quality in fuel injectors, static flow rating being the only thing standard to be compared from one injector to the next.
Everything you could ever want to know about the ID725 is on that page. Ask for similar information from the other manufacturers and see how things compare.
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Joined: Mar 2010
Posts: 229
Likes: 0
From: Rochester Hills, MI, 48309
Re: Injector size?
725cc isn't exactly overkill. 1000cc's would be overkill. It's still within the efficiency range of the injector, you're just a little on the lower side. Which is why he stated that you'll still have a bit of headroom.
But, to answer your question, yes the 660cc's will be at your "optimum" range of efficiency, but if you plan on upping the power in the near future, then you'll not have to worry about maxxing out your duty cycle if you go with the 725cc's.
Remember, it's always smart to be a little on the rich side.
But, to answer your question, yes the 660cc's will be at your "optimum" range of efficiency, but if you plan on upping the power in the near future, then you'll not have to worry about maxxing out your duty cycle if you go with the 725cc's.
Remember, it's always smart to be a little on the rich side.
Last edited by AddictsRacing; Jun 16, 2010 at 08:15 AM.
Joined: Mar 2010
Posts: 229
Likes: 0
From: Rochester Hills, MI, 48309
Re: Injector size?
When an injector is 'too big', you suffer from poor atomization and operating in the non linear range of the fuel injector.
As you can see in this graph, the linear flow of the ID725 at 40psi fuel pressure goes down to almost nothing. A typical Honda uses around 70-90cc/min at idle, which as you can see is well within the linear operating range.
I can guarantee you the ID725 has better atomization than any of the other injectors you're considering. Something else to consider, Noble is using the ID725's in their new production car, the M600. The M600 is a V8 that makes 650bhp, which would be the same as a 4 cylinder making 325bhp, pretty similar to your goals, no? Also keep in mind that production road vehicles like the M600 have very strict emissions guidelines that must be met, something that is not possible without good injectors.
http://www.noblecars.com/m600/m600.html
When comparing injectors, you should be looking at the details about the injectors themselves, not only the flow rating. There is a HUGE range of performance/quality in fuel injectors, static flow rating being the only thing standard to be compared from one injector to the next.
Everything you could ever want to know about the ID725 is on that page. Ask for similar information from the other manufacturers and see how things compare.
As you can see in this graph, the linear flow of the ID725 at 40psi fuel pressure goes down to almost nothing. A typical Honda uses around 70-90cc/min at idle, which as you can see is well within the linear operating range.
I can guarantee you the ID725 has better atomization than any of the other injectors you're considering. Something else to consider, Noble is using the ID725's in their new production car, the M600. The M600 is a V8 that makes 650bhp, which would be the same as a 4 cylinder making 325bhp, pretty similar to your goals, no? Also keep in mind that production road vehicles like the M600 have very strict emissions guidelines that must be met, something that is not possible without good injectors.
http://www.noblecars.com/m600/m600.html
When comparing injectors, you should be looking at the details about the injectors themselves, not only the flow rating. There is a HUGE range of performance/quality in fuel injectors, static flow rating being the only thing standard to be compared from one injector to the next.
Everything you could ever want to know about the ID725 is on that page. Ask for similar information from the other manufacturers and see how things compare.
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