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Larger Injectors 

 

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 Post subject: Larger Injectors
Posted: Mon Aug 22, 2005 3:15 pm 
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Location: Maryborough
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I bought a set of 20lb injector for my car.These were off a 4.1efi Falcon.My problem is that although they run fine, the engine starts to vary its idle after a time just idling.You can drive it and do what you want, but idle it for a time and its starts to vary.I have found a site that says the STD injectors are only 18.15lbs and the ones I put in are 20.4lb.Lost cause???
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Posted: Mon Aug 22, 2005 3:23 pm 
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Any difference in fuel pressure on the 4.1?? Flow ratings are specified at a specific fuel pressure... standard EF I6 injectors are 19#.

Maybe try resitting the ECU... are the injectors you put on there clean/recon??

I thought 4.1 EFI was CFI...

 

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Posted: Mon Aug 22, 2005 4:25 pm 
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I don't think it is fuel pressure as I disconnect the fpr and it was about the same etc.,.It will idle ok then momently die/loose its idle then resume, idle for a while then die/loose its idle.Does not stall or anything and still very drivable.They had been cleaned and tested.They are bosch 0-280-150-215 and the ones in the car where 0-280-150-790
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Posted: Mon Aug 22, 2005 5:25 pm 
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is the iidle hunting up or down??

 

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Posted: Mon Aug 22, 2005 6:47 pm 
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Posted: Mon Aug 22, 2005 7:06 pm 
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I thought you had to change/modify/chip your ECU when you changed injectors. How does the ECU know the injectors are flowing more?

 

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Posted: Mon Aug 22, 2005 7:16 pm 
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hunting down means its rich
because you have added a set of larger injectors, the ecu still opens them for the same time. but coz there bigger, they feed more fuel in the same time.
look into a chip or somethin to make the most of them

 

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Posted: Mon Aug 22, 2005 7:29 pm 
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I just get the old ones done up and sell these when done etc., I was just hoping that they would work.i had been hoping the ecu could handle the 2lb driffance.
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Posted: Mon Aug 22, 2005 10:10 pm 
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nope, the EccIV & EccV is as tite as your lil sister

 

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Posted: Mon Aug 22, 2005 10:15 pm 
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i am also looking into it but i don't fully understand what the pros and cons are or getting larger plugs and leads??

 

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Posted: Mon Aug 22, 2005 10:37 pm 
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not much really.

get yourself a set of ngk Xr spek plugs and a good set of 8mm leads.

you wont find gains unless your runnig a wild ignitin setup or forced induction

 

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