Injector scaling and latecy for different injectors.
FIC rates their injectors funny.
Take for instance the 1050. It is actually a 105# per minute injector. 105 x 10.5(conversion)=1102cc which matches the balance chart perfectly.
750=787
850=892
etc.
I am all about helping, but some things I cant just hand out. I will tell you though that 914 worked well for the scaling on the 1050's.
FIC1000s are 860 and it seems to work well. Latency looked something like this (again for the 1000 not 1050)
3.312
1.68
1.344
1.152
0.84
0.504
0.24
Take for instance the 1050. It is actually a 105# per minute injector. 105 x 10.5(conversion)=1102cc which matches the balance chart perfectly.
750=787
850=892
etc.
I am all about helping, but some things I cant just hand out. I will tell you though that 914 worked well for the scaling on the 1050's.
FIC1000s are 860 and it seems to work well. Latency looked something like this (again for the 1000 not 1050)
3.312
1.68
1.344
1.152
0.84
0.504
0.24
Last edited by JohnBradley; Mar 12, 2008 at 07:20 PM.
What company does AMS use? I got their 780s and wound up at 739 which works about right for the FIC?
FIC rates their injectors funny.
Take for instance the 1050. It is actually a 105# per minute injector. 105 x 10.5(conversion)=1102cc which matches the balance chart perfectly.
750=787
850=892
etc.
I am all about helping, but some things I cant just hand out. I will tell you though that 914 worked well for the scaling on the 1050's.
FIC1000s are 860 and it seems to work well. Latency looked something like this (again for the 1000 not 1050)
3.312
1.68
1.344
1.152
0.84
0.504
0.24
Take for instance the 1050. It is actually a 105# per minute injector. 105 x 10.5(conversion)=1102cc which matches the balance chart perfectly.
750=787
850=892
etc.
I am all about helping, but some things I cant just hand out. I will tell you though that 914 worked well for the scaling on the 1050's.
FIC1000s are 860 and it seems to work well. Latency looked something like this (again for the 1000 not 1050)
3.312
1.68
1.344
1.152
0.84
0.504
0.24
Most of my 780's end up in mid to high 600's. I am not sure what company they use but I believe it had been PTE (precision).
Scaling injectors is kind of like women. There are alot of them and our goal is to get the one we want. You dont always use the same tactics though even with the same woman. Throw all the different types you are bound to encounter into the mix and sooner or later you realise its the journey as much as the destination.
In otherwords, two people will not have the same scaling or latency even for the same injector. Heck I put a set of Stock 560's in a honda and in Emange I entered the size and latency as listed in ECUflash. Guess what? Like all hondas nothing you "know" helps. Ended up having to go to totally different scaling and values to get it cooperate.
Edit-I think I misunderstood the question based on Scotts response. I thought we were talking about scaling not flow rating. I have never seen a balance chart for FIC's flow less than they are rated but they almost always flow the equivalent of their lb/min rating as it had been explained to me.
Scaling injectors is kind of like women. There are alot of them and our goal is to get the one we want. You dont always use the same tactics though even with the same woman. Throw all the different types you are bound to encounter into the mix and sooner or later you realise its the journey as much as the destination.
In otherwords, two people will not have the same scaling or latency even for the same injector. Heck I put a set of Stock 560's in a honda and in Emange I entered the size and latency as listed in ECUflash. Guess what? Like all hondas nothing you "know" helps. Ended up having to go to totally different scaling and values to get it cooperate.
Edit-I think I misunderstood the question based on Scotts response. I thought we were talking about scaling not flow rating. I have never seen a balance chart for FIC's flow less than they are rated but they almost always flow the equivalent of their lb/min rating as it had been explained to me.
Last edited by JohnBradley; Mar 12, 2008 at 08:42 PM.
Most of my 780's end up in mid to high 600's. I am not sure what company they use but I believe it had been PTE (precision).
Scaling injectors is kind of like women. There are alot of them and our goal is to get the one we want. You dont always use the same tactics though even with the same woman. Throw all the different types you are bound to encounter into the mix and sooner or later you realise its the journey as much as the destination.
In otherwords, two people will not have the same scaling or latency even for the same injector. Heck I put a set of Stock 560's in a honda and in Emange I entered the size and latency as listed in ECUflash. Guess what? Like all hondas nothing you "know" helps. Ended up having to go to totally different scaling and values to get it cooperate.
Edit-I think I misunderstood the question based on Scotts response. I thought we were talking about scaling not flow rating. I have never seen a balance chart for FIC's flow less than they are rated but they almost always flow the equivalent of their lb/min rating as it had been explained to me.
Scaling injectors is kind of like women. There are alot of them and our goal is to get the one we want. You dont always use the same tactics though even with the same woman. Throw all the different types you are bound to encounter into the mix and sooner or later you realise its the journey as much as the destination.
In otherwords, two people will not have the same scaling or latency even for the same injector. Heck I put a set of Stock 560's in a honda and in Emange I entered the size and latency as listed in ECUflash. Guess what? Like all hondas nothing you "know" helps. Ended up having to go to totally different scaling and values to get it cooperate.
Edit-I think I misunderstood the question based on Scotts response. I thought we were talking about scaling not flow rating. I have never seen a balance chart for FIC's flow less than they are rated but they almost always flow the equivalent of their lb/min rating as it had been explained to me.
You guys are making injector scaling way too hard. Most injectors are rated at 43.5 psi fuel pressure. A fuel pressure regulator will allow that much pressure at 0 psi from the intake manifold. At idle, there is some vacuum which will take some fuel pressure away.
So read what your fuel pressure says at idle, let's say it's 38 psi.
38psi/43.5psi = 87.35%
Take 12.65% out of your advertised injector size and that's your injector scaling. Of course you will still have to make small changes after logging your fuel trims but this will get you much closer than guessing.
Injector latencies would have to be tested in an isolated environment, not on a car. Refer to AEM's latency tables that they have defined. The link is under "how to tune an evo" thread and it's in the stickies on this subforum.
So read what your fuel pressure says at idle, let's say it's 38 psi.
38psi/43.5psi = 87.35%
Take 12.65% out of your advertised injector size and that's your injector scaling. Of course you will still have to make small changes after logging your fuel trims but this will get you much closer than guessing.
Injector latencies would have to be tested in an isolated environment, not on a car. Refer to AEM's latency tables that they have defined. The link is under "how to tune an evo" thread and it's in the stickies on this subforum.
Last edited by bostonhatcher; Mar 13, 2008 at 11:59 AM.
You guys are making injector scaling way too hard. Most injectors are rated at 43.5 psi fuel pressure. A fuel pressure regulator will allow that much pressure at 0 psi from the intake manifold. At idle, there is some vacuum which will take some fuel pressure away.
So read what your fuel pressure says at idle, let's say it's 38 psi.
38psi/43.5psi = 87.35%
Take 12.65% out of your advertised injector size and that's your injector scaling. Of course you will still have to make small changes after logging your fuel trims but this will get you much closer than guessing.
Injector latencies would have to be tested in an isolated environment, not on a car. Refer to AEM's latency tables that they have defined. The link is under "how to tune an evo" thread and it's in the stickies on this subforum.
So read what your fuel pressure says at idle, let's say it's 38 psi.
38psi/43.5psi = 87.35%
Take 12.65% out of your advertised injector size and that's your injector scaling. Of course you will still have to make small changes after logging your fuel trims but this will get you much closer than guessing.
Injector latencies would have to be tested in an isolated environment, not on a car. Refer to AEM's latency tables that they have defined. The link is under "how to tune an evo" thread and it's in the stickies on this subforum.
You guys are making injector scaling way too hard. Most injectors are rated at 43.5 psi fuel pressure. A fuel pressure regulator will allow that much pressure at 0 psi from the intake manifold. At idle, there is some vacuum which will take some fuel pressure away.
So read what your fuel pressure says at idle, let's say it's 38 psi.
38psi/43.5psi = 87.35%
Take 12.65% out of your advertised injector size and that's your injector scaling. Of course you will still have to make small changes after logging your fuel trims but this will get you much closer than guessing.
Injector latencies would have to be tested in an isolated environment, not on a car. Refer to AEM's latency tables that they have defined. The link is under "how to tune an evo" thread and it's in the stickies on this subforum.
So read what your fuel pressure says at idle, let's say it's 38 psi.
38psi/43.5psi = 87.35%
Take 12.65% out of your advertised injector size and that's your injector scaling. Of course you will still have to make small changes after logging your fuel trims but this will get you much closer than guessing.
Injector latencies would have to be tested in an isolated environment, not on a car. Refer to AEM's latency tables that they have defined. The link is under "how to tune an evo" thread and it's in the stickies on this subforum.
-Paul
Unfortunately that doesn't really explain any of it. With vacuum in your intake manifold you still have a 43.5 psi pressure differential across the injector. The reason your fuel pressure drops is to maintain that 43.5 psi, if it did not you would have an effective fuel pressure of 48.5 psi at idle and 23.5 at 20 psi.
-Paul
-Paul
Ok so why do you disconnect your vacuum line on an adjustable fuel pressure regulator when setting your base fuel pressure? Vacuum will bring down fuel pressure at a 1:1 ratio.
Unfortunately that doesn't really explain any of it. With vacuum in your intake manifold you still have a 43.5 psi pressure differential across the injector. The reason your fuel pressure drops is to maintain that 43.5 psi, if it did not you would have an effective fuel pressure of 48.5 psi at idle and 23.5 at 20 psi.
-Paul
-Paul
Where's your theory on why every single injector that's rated for 43.5 psi has to be scaled down 10-15%? All I see is a bunch of talk about "pressure differential across the injector" LOL.
Don't post stupid theories about boost making fuel pressure go down either. In fact, don't post anything but questions because you are lost.