View Full Version : injector problems
i have just turboed my 1995 1.8 BP astina, I would like to know the injector sizes on the non turbo BP and the turbo and also the colour codings of the injectors if possible. I am still using the factory ecu with the non turbo injectors the engine runs too lean, but with the turbo injectors it runs too rich but goes like a rocket. can sombody tell me what cc injectors I need so it is not too lean or rich. or has anyone got other sugestions.
factory mgmt being the BP ecu or the BPT ecu?
If BP, anything above 0psi you have no fuel maps for.
BigMal
22-08-2004, 09:46 PM
Running a BPT with a BP ECU is an accident waiting to happen regardless of
what injectors you use. Obviously the BPT injectors are the right ones go get
yourself a GTX ecu and have it wired in. You will need the GTX AFM as well.
I am still running the factory computer and afm (non-flap type) i am just experimenting as the car goes so well, apart from it running rich. and everybody has said the car would not even run and so far I have proved them wrong. does any one know the standard injertor flow rate is and does any one know the bp GTX injertor flow rate is.
N.B the vehicle is a 1995 BA astina 1.8
N.B don't the factory computers re-map themselves
The car will run sure enough but as you go past 0psi, the computer attempts to scale based on its last known map and in most cases you will run lean. Waking in a bigger injector wont work unless you can retune the maps. You may be able to compensate the richness by lowering the rail pressure but not an ideal solution. The ignition maps are also very different between an NA and Turbo car so you will probably run into detonation or pinging at some point in time running on the NA ecu.
Your best bet is to invest in a Fuel/Ignition computer and run it over the top of your factory management (or instead of). Somthing like a Haltech or Microtech would do the job fine.
An Apexi AFC may also give you enough play to increase the fueling for your applications but I personally dont like the idea of altering signals and would rather get somthing which can work with a base signal.
"N.B don't the factory computers re-map themselves"
The closed loop system will compensate for +-5% generally which is nowhere near enough for turbo purposes.
ROB-80E
24-08-2004, 09:08 AM
The GTX injectors are 420cc. But yeah, your best bet is to get some sort of fuel management as Jynx said. The last thing you want to do is blow up your engine because you were too stingy to do it right the first time.
You've managed to turbo the NA motor, congrats, but don't stuff it by not running propper fuel maps for boost.
Dont know what the NA injector size is sorry dude.
I have done some reading and have found 2 conflicting stories about injectors rob-80e says the gtx injectors are 420cc and some one else in the forums (I can't remember where) states they are 330cc for the GTX and 380cc for the GTR which is correct??? :?
BigMal
25-08-2004, 02:47 AM
330cc min to 420cc max. In the Manual it refers to both these readings the 330cc
being the lowest reading to be acceptable for use. As cleaned/New will be at the
top reading then thats why they have been called 420cc as thats what they will
flow at standard pressure in that condition. Same applies to the GTR injectors
the 380cc being the min acceptable reading.
dfvadr
25-08-2004, 05:20 PM
i can see a motor going bang here :shock:
^^^^ true that ... but give us some pics details etc ... will be interesting to see your set up!!
Cosmo Dude
25-08-2004, 09:14 PM
I'd be looking at your ignition.
When you get vacuum in an NA application the ignition should advance and with a turbo boost should retard the ignition.
The factory BA ECU is programmed to map ignition based only on the expected vacuum. This could lead to an incomplete fuel burn and therefore unburnt fuel being expelled from the engine (rich).
The good folk at www.flyinmiata.com have a module that will read the vacuum or boost and wired into the factory ECU changes the ignition timing to suit, they use it on their 8PSI turbo kit.
For a low boost setup this would be much cheaper than an aftermarket ECU and tuning
BigMal
25-08-2004, 11:10 PM
Yeah its a MSD retard unit you are still better off with a GTX ECU for around
$100-$200 plus wiring.
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