Air Injectors. What are they and how do they work?
21-03-2006, 03:28 PM
#41
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Interesting read..
I opted for a Blitz boost controller (SBCi Color) which utilises the Dual Solenoid type, rather than Air Injectors.
This works exceptionally well, but completely independent of the ECU - The controller does all the work. As such, the Amal Valve was unceremoniously dumped.
Assuming that I have set the boost accordingly to the chip being run (and not just cranked the boost too high!), are there any warnings that I should consider having done it this way (ie removing the ECU from the boost control)?
PS - You are all clever bast**ds!!
JJ
I opted for a Blitz boost controller (SBCi Color) which utilises the Dual Solenoid type, rather than Air Injectors.
This works exceptionally well, but completely independent of the ECU - The controller does all the work. As such, the Amal Valve was unceremoniously dumped.
Assuming that I have set the boost accordingly to the chip being run (and not just cranked the boost too high!), are there any warnings that I should consider having done it this way (ie removing the ECU from the boost control)?
PS - You are all clever bast**ds!!
JJ
22-03-2006, 06:32 AM
#42
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Well the most obvious one to me is the ACT's, since the Ecu pulses the Amal in normal operation when the ACT's get too high to reduce the risk of Det.
With no ECU control (I dont know if your controller can make the necessary adjustments) you could run into problems if your IC setup is not optimal and on perhaps a very hot day in the summer.....
With no ECU control (I dont know if your controller can make the necessary adjustments) you could run into problems if your IC setup is not optimal and on perhaps a very hot day in the summer.....
22-03-2006, 08:31 AM
#43
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Hmm. Without wishing to sound dumb, ACT? Also, perhaps you could explain to me how it could cause detonation. Sorry, my basic understanding is not up to it!
I am guessing that it is Air Control Temperature (a bit like ECT). If so, point made. The Boost controller works to target boost (ie I say I want 1.5Bar, and it delivers 1.5Bar).
However, I stripped the head off the engine recently, and there was no evidence of detonation at all, and this was following a trip around the nurgburgrin in summer. (Phew).
I am guessing that it is Air Control Temperature (a bit like ECT). If so, point made. The Boost controller works to target boost (ie I say I want 1.5Bar, and it delivers 1.5Bar).
However, I stripped the head off the engine recently, and there was no evidence of detonation at all, and this was following a trip around the nurgburgrin in summer. (Phew).
22-03-2006, 08:38 AM
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ACT = Air Charge Temperature, so you're basically right.
If you've given the engine hard track running in hot temperatures at that boost level and have no signs of det, then you might be ok.
If you've given the engine hard track running in hot temperatures at that boost level and have no signs of det, then you might be ok.
22-03-2006, 08:42 AM
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Thanks for the input. I will check into this with my colleague that helps me with the engine works to see if he has a view on this.
I am aiming to replace the ECU complete soon with aftermarket (prob Omex). At this point, I will look into interfacing the Boost Controller with the new ECU, as the controller has the facility to take a map from an ECU.
In the meantime, I need to investigate as to why my engine smokes like a 50 a day grandmother...
I am aiming to replace the ECU complete soon with aftermarket (prob Omex). At this point, I will look into interfacing the Boost Controller with the new ECU, as the controller has the facility to take a map from an ECU.
In the meantime, I need to investigate as to why my engine smokes like a 50 a day grandmother...
25-03-2006, 08:06 PM
#46
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Right
I have been thinking about the last post, and want to clarify something.
The ECU knows the temperature of the air within the inlet via the ACT.
The boost controller doesnt
The ECU also knows what the boost is via the map sensor. And as such, it makes adjustments to the fuelling according to the information given.
Given that the ECU knows the Air temperature and boost level, then I dont actually see why the Boost controller needs to know, providing that the ECU has enough tolerance in fuelling etc. to make adjustments in relation to the air density.
Forgive me for asking the above if it is obvious the rest of you.
JJ
I have been thinking about the last post, and want to clarify something.
The ECU knows the temperature of the air within the inlet via the ACT.
The boost controller doesnt
The ECU also knows what the boost is via the map sensor. And as such, it makes adjustments to the fuelling according to the information given.
Given that the ECU knows the Air temperature and boost level, then I dont actually see why the Boost controller needs to know, providing that the ECU has enough tolerance in fuelling etc. to make adjustments in relation to the air density.
Forgive me for asking the above if it is obvious the rest of you.
JJ
17-04-2007, 04:20 PM
#55
The 909s dont exist anymore, only copies of them as they are now 10+ years old, but of course there are good and bad, and yes, there are really really bad ones using FUEL injectors that burn out in no time at all!! 
We do a single version, far more modern in design and works just the same as the old 909 twins but uses one injector that flows twice as much as the old ones that needed two.
http://cgi.ebay.co.uk/ws/eBayISAPI.d...8411&rd=1&rd=1
We do a single version, far more modern in design and works just the same as the old 909 twins but uses one injector that flows twice as much as the old ones that needed two.
http://cgi.ebay.co.uk/ws/eBayISAPI.d...8411&rd=1&rd=1
21-12-2008, 08:50 PM
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that matters on wot / or who set the air injectors up.
as some i've seen have 0.8 or 1.2mm jets on the lower body of the air inj's, so any positive boost can escape duein gear changes, and also changes the amount of boost at same air inj duty in the map.
on mine i have no jet now, but the bottom alloy bolt on the air injectors bodie has a slight groove in the thread, so it still releases the positive boost when the air injectors are shut.
Mine are ford motorsport ones. dont know if newer ones differ.
if your cars runnin over 29.5 psi and mapped for this, and then the air injectors fail, your need a 5 bar map sensor to relieze this. as 3 bar map sensor only reads to 29 - 31 psi (matters on sensor)
as some i've seen have 0.8 or 1.2mm jets on the lower body of the air inj's, so any positive boost can escape duein gear changes, and also changes the amount of boost at same air inj duty in the map.
on mine i have no jet now, but the bottom alloy bolt on the air injectors bodie has a slight groove in the thread, so it still releases the positive boost when the air injectors are shut.
Mine are ford motorsport ones. dont know if newer ones differ.
if your cars runnin over 29.5 psi and mapped for this, and then the air injectors fail, your need a 5 bar map sensor to relieze this. as 3 bar map sensor only reads to 29 - 31 psi (matters on sensor)
I have the 909 style injector bodys but dont have the end fittings yet - I think they are 7/16" unf ?
I know Stu mentioned the bleed hole in the FF article but is there a set place it has to be ?
I was wondering if someone could tell me the correct size hole and if I could simply drill the blanking plug on the actuator side body ?
Cheers for any help / input / links etc
WD
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