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Location:
Newcastle
Registered:
May 2002
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Registered:
November 2002
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Re: Increasing 3tgte Injector Size
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Mon, 22 November 2004 12:53
 
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Stock injectors are 295cc. I have run 440cc on the stock AFM and ECU with pretty good results.
I think 440's are about as big as you can go with the stock AFM. I had to retune the AFM, although top end was very good you will lose out on cold start or idle as the changes you make are across the whole rev range and the reason why I upgraded to an aftermarket system.
Unless your going to upgrade the trubo as well I would just keep the old injectors and ECU and just give it a bit more boost, say 10 or 12psi. The stock injectors have a bit left in them on a stock setup.
cheers,
Simon
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Location:
Perth
Registered:
August 2004
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Re: Increasing 3tgte Injector Size
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Mon, 22 November 2004 15:51
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I have found the 440's to be a bit of a pain with the standard ecu... Where it was running way too rich at idle in the mornings...
Do you have an aftermarket turbo???
If not i wouldnt even bother changing the injectors...
If you want a cheapish solutions many people have used the Megasquirt ECU (about $250) on the 3TGTE with great success...
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Location:
Newcastle
Registered:
May 2002
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Re: Increasing 3tgte Injector Size
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Tue, 23 November 2004 08:56
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Sorry guys I should have explained myself a bit better. 
Already have a different turbo Mitsubishi TD05, large front mount inter-cooler and a front entry manifold and it's currently running about 13psi.
So, in theory  , if the stock ones are 295cc, if I upped them to say 330cc (if there is such a size, right resistance, etc) than I may be able to run say 15-16psi without to much trouble, without causing to much problems with cold start and idle, you would think. Cold start etc is not to much of a problem as this is my toy car and only dose about 5-7000kms per year.
[Updated on: Tue, 23 November 2004 08:58]
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Location:
Perth
Registered:
August 2004
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Re: Increasing 3tgte Injector Size
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Tue, 23 November 2004 13:08
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Oh ok well in that case you could benefit from larger injectors... There are plenty of people who have put the 440's on the 3t with little trouble however this has not been my experience....
If you could find some injectors around the 330 - 350 it would be a lot easier to get idling correctly... They are just top feed injectors and and should be quite easy to get other injectors to fit..
Even still I would get a cheap air/fuel meter/guage installed as these engines have a tendancy to blow the factory pistons when it gets too lean....
Other than that your idea sound like the go.. anything beyond that I would again urge you to look at an aftermarket ecu
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Location:
Newcastle
Registered:
May 2002
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Re: Increasing 3tgte Injector Size
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Wed, 24 November 2004 07:31
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| stark wrote on Wed, 24 November 2004 00:08 |
Even still I would get a cheap air/fuel meter/guage installed as these engines have a tendancy to blow the factory pistons when it gets too lean....
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Already have a Autometer A/F ratio which dosen't read lean at the moment but that dosen't mean it not running very close to 100% duty cycle.
Another thing I hadn't mentioned was it dose already have ross racing forged pistons, gapless rings, o-ringed and a cleaned up head. I proberly should have explain this from the start, sorry .
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Location:
Perth
Registered:
August 2004
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Re: Increasing 3tgte Injector Size
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Thu, 25 November 2004 01:50
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Well if youve gone to all the trouble of doing the above modification ditch the factory ECU... It is by far your weakest link and fiddling around with the factory system with that leave of modification will achieve minimal gains for a lot of piss farting around..
If your budget doesnt stretch to a Haltech and the like as i stated above look into a Megasquirt... Cheap reliable and will run bigger injectors a lot better than the old analog ljet tronic based system in there now...
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Location:
On your mum!
Registered:
May 2002
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Re: Increasing 3tgte Injector Size
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Thu, 25 November 2004 02:13
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You KNOW what you need to do! stop wasting these good ppls time and just do it.
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Location:
Newcastle
Registered:
May 2002
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Re: Increasing 3tgte Injector Size
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Thu, 25 November 2004 07:24
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If your budget doesnt stretch to a Haltech and the like as i stated above look into a Megasquirt... Cheap reliable and will run bigger injectors a lot better than the old analog ljet tronic based system in there now...
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You KNOW what you need to do! stop wasting these good ppls time and just do it.
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Yeah, yeah I know what I have to do but the budget just doesn't stretch that far. That's why I was looking for that little bit more to satisfy me for now (sound like something your wife would say to you ). This was never intended to be a permanent solution but one to try and squeeze 15-16 psi until I can afford an aftermarket.
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