8 injector help!
08-05-2007, 08:31 PM
#1
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8 injector help!
hi there, im just wandering why people stil need to use 8 injectors when 1000cc are available etc can you get morw accuracy or something? ive got 550 high imp at the mo and am just wandering which route is better for more power and out of curiosity!! 
08-05-2007, 10:34 PM
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second injector rail mostly is installed farther then primary
fuel have longer way to the cylinder and it can vapourise better, and it have more time to
take away some heat from air and improve charge density
using only one rail far inlet valves isnt good for low revs
fuel have longer way to the cylinder and it can vapourise better, and it have more time to
take away some heat from air and improve charge density
using only one rail far inlet valves isnt good for low revs
09-05-2007, 05:34 AM
#3
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It is nothing to do with the amount of injector rails this merely supplies the injectors.
It is the siting of the injectors, with 8 you can optimise for low speed torque, where they will fire at the back of the valve to futher away STRAIGHT down throat where they will have longer to mix being combustion, as said it also helps with latent heat absorbtion.
Advances since 8 injecotr days in the area of ECU makes this(almost) redundant now, as you can get ace fuelling across the board with large injectors as better maps are available.
tabetha
It is the siting of the injectors, with 8 you can optimise for low speed torque, where they will fire at the back of the valve to futher away STRAIGHT down throat where they will have longer to mix being combustion, as said it also helps with latent heat absorbtion.
Advances since 8 injecotr days in the area of ECU makes this(almost) redundant now, as you can get ace fuelling across the board with large injectors as better maps are available.
tabetha
25-11-2007, 09:52 PM
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Originally Posted by mappindude
4 large injectors usually make for poor emissions @ idle
26-11-2007, 06:02 AM
#7
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Originally Posted by Flux Capacitor
Originally Posted by mappindude
4 large injectors usually make for poor emissions @ idle
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26-11-2007, 08:23 AM
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like me who has got some cars to pass cat test (without a cat)
and some carbed cars for that matter.
I Speak from experience.
(not cyber experience)
The bigger the injector generally the worst the emissions will be .
I try to help people on this forum and give another opinion.
and some carbed cars for that matter.
I Speak from experience.
(not cyber experience)
The bigger the injector generally the worst the emissions will be .
I try to help people on this forum and give another opinion.
26-11-2007, 11:29 AM
#9
Too many posts.. I need a life!!
There are two elements that affect the ability of an ecu to control large injectors at small pulsewidths;
i) The resolution in the software to command the small pulsewidths required at idle. i.e. not all ecu's have the ability to do this.
ii) The ability of the hardware to drive the injectors open fast enough and for them to close quickly enough to produce repeatable small pulsewidths. Again, this depends on the ecu and injectors.
So, it it is not as simple as saying whether 8 smaller or 4 larger injectors is better and you need to know about the system controlling them.
i) The resolution in the software to command the small pulsewidths required at idle. i.e. not all ecu's have the ability to do this.
ii) The ability of the hardware to drive the injectors open fast enough and for them to close quickly enough to produce repeatable small pulsewidths. Again, this depends on the ecu and injectors.
So, it it is not as simple as saying whether 8 smaller or 4 larger injectors is better and you need to know about the system controlling them.
26-11-2007, 11:31 AM
#10
Originally Posted by sailorbob
There are two elements that affect the ability of an ecu to control large injectors at small pulsewidths;
i) The resolution in the software to command the small pulsewidths required at idle. i.e. not all ecu's have the ability to do this.
ii) The ability of the hardware to drive the injectors open fast enough and for them to close quickly enough to produce repeatable small pulsewidths. Again, this depends on the ecu and injectors.
So, it it is not as simple as saying whether 8 smaller or 4 larger injectors is better and you need to know about the system controlling them.
i) The resolution in the software to command the small pulsewidths required at idle. i.e. not all ecu's have the ability to do this.
ii) The ability of the hardware to drive the injectors open fast enough and for them to close quickly enough to produce repeatable small pulsewidths. Again, this depends on the ecu and injectors.
So, it it is not as simple as saying whether 8 smaller or 4 larger injectors is better and you need to know about the system controlling them.
26-11-2007, 04:43 PM
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Originally Posted by Flux Capacitor
Originally Posted by mappindude
4 large injectors usually make for poor emissions @ idle
15-12-2007, 09:20 AM
#14
Originally Posted by sailorbob
There are two elements that affect the ability of an ecu to control large injectors at small pulsewidths;
i) The resolution in the software to command the small pulsewidths required at idle. i.e. not all ecu's have the ability to do this.
ii) The ability of the hardware to drive the injectors open fast enough and for them to close quickly enough to produce repeatable small pulsewidths. Again, this depends on the ecu and injectors.
So, it it is not as simple as saying whether 8 smaller or 4 larger injectors is better and you need to know about the system controlling them.
i) The resolution in the software to command the small pulsewidths required at idle. i.e. not all ecu's have the ability to do this.
ii) The ability of the hardware to drive the injectors open fast enough and for them to close quickly enough to produce repeatable small pulsewidths. Again, this depends on the ecu and injectors.
So, it it is not as simple as saying whether 8 smaller or 4 larger injectors is better and you need to know about the system controlling them.
Makes sense to me though
19-12-2007, 07:27 PM
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They were greys .
On a chipped Iaw ecu. saw a few ,all had crap emissions.
but wow,this forum has some serious flamers in here dont it?.you really welcome new people dont you.
takes all sorts i guess.
On a chipped Iaw ecu. saw a few ,all had crap emissions.
but wow,this forum has some serious flamers in here dont it?.you really welcome new people dont you.
takes all sorts i guess.
19-12-2007, 07:36 PM
#21
Originally Posted by mappindude
They were greys .
On a chipped Iaw ecu. saw a few ,all had crap emissions.
but wow,this forum has some serious flamers in here dont it?.you really welcome new people dont you.
takes all sorts i guess.
On a chipped Iaw ecu. saw a few ,all had crap emissions.
but wow,this forum has some serious flamers in here dont it?.you really welcome new people dont you.
takes all sorts i guess.
19-12-2007, 08:48 PM
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Originally Posted by mappindude
The greys had nothing to do with the poor emissions i assure you. It was just bad mapping.
My Dad's car runs at lambda 1 on 890cc injectors and returns 30 mpg on Marelli.
20-12-2007, 08:48 PM
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Having recently had my engine re-built, I went for the WRC 8 injector route purly for emmisions. There are more and more Police carring emmision testers in their cars and because of the "Greenies" pressure fines are now quite high.
As you can argue that the car can only be tested to the same as MOT standard (on tickover) 8 injectors gives you the best chance of passing with a tuned engine.
Maybe I wasted my cash, but at least I feel safe if pulled over.
As you can argue that the car can only be tested to the same as MOT standard (on tickover) 8 injectors gives you the best chance of passing with a tuned engine.
Maybe I wasted my cash, but at least I feel safe if pulled over.
21-12-2007, 11:51 PM
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Originally Posted by FROMFIFE
Having recently had my engine re-built, I went for the WRC 8 injector route purly for emmisions. There are more and more Police carring emmision testers in their cars and because of the "Greenies" pressure fines are now quite high.
As you can argue that the car can only be tested to the same as MOT standard (on tickover) 8 injectors gives you the best chance of passing with a tuned engine.
Maybe I wasted my cash, but at least I feel safe if pulled over.
As you can argue that the car can only be tested to the same as MOT standard (on tickover) 8 injectors gives you the best chance of passing with a tuned engine.
Maybe I wasted my cash, but at least I feel safe if pulled over.
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