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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 06-25-2005, 02:25 PM   #1 (permalink)
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I am getting 6 new injectors for my E30 and I was wondering what the Stock pressure rating is...e.g.(15 lbs) I found some injectors that were rated at 15 pounds and I want to know if these are suitable for my car. Thanks
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Old 06-25-2005, 06:07 PM   #2 (permalink)
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I've been doing an injector upgrade on my '90 325IC, and here's what I've come up with :

the stock injectors are rated at 14lbs per hour

The stock fuel pressure is : 3 bar

a bar of pressure is equal to 14.5 ft/lbs, so 3bar should read 43.51 ft/lbs on a fuel pressure guage if my math is correct.
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Old 06-25-2005, 06:51 PM   #3 (permalink)
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Does any one know enough about E30 fuel systems to know if 15 lb injectors would disrupt my current system, like the car running to rich or lean at certain rpm..etc... Thanks again guys
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Old 06-25-2005, 08:32 PM   #4 (permalink)
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Quote:
Originally posted by Bmw1990@Jun 25 2005, 04:51 PM
Does any one know enough about E30 fuel systems to know if 15 lb injectors would disrupt my current system, like the car running to rich or lean at certain rpm..etc... Thanks again guys
[snapback]357044[/snapback]

no it wont, maybe for a week or so but then the computer should learn them and make adjustments. but where did you get 15 lb injectors from?
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Old 06-25-2005, 09:17 PM   #5 (permalink)
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Right Here...

http://www.fiveomotorsport.com/Injector_SetsBMW.asp
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Old 06-25-2005, 09:31 PM   #6 (permalink)
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Quote:
Originally posted by Bmw1990@Jun 25 2005, 06:17 PM
Right Here...

http://www.fiveomotorsport.com/Injector_SetsBMW.asp
[snapback]357069[/snapback]
you can run up to 24# injectors on the stock ECU and it wont run overly lean. i was doing it for a while, but just backed off to 20.5# injectors 2 days ago because the ireland engineering injectors were of better quality then the 24# disc injectors i had.

just have to tune your AFM to know that there are bigger injectors there.
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Old 06-26-2005, 01:50 AM   #7 (permalink)
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just have to tune your AFM to know that there are bigger injectors there.
[snapback]357074[/snapback]
[/quote]

doesn't the computer do that for you?
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Old 06-26-2005, 10:02 AM   #8 (permalink)
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Quote:
Originally Posted by Kowalski,Jun 25 2005, 10:50 PM
just have to tune your AFM to know that there are bigger injectors there.
[snapback]357074[/snapback]
doesn't the computer do that for you?
[snapback]357117[/snapback]
[/quote]

no. it does to a point but not for big injectors.

you have to pull off the blue plug on the afm and turn it CCW to lean it out. otherwise you'll get a check engine light every time you have the throttle constantly at any position (cruise control on, idling at a stop light, etc) and you'll run overly rich.
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Old 06-27-2005, 11:16 PM   #9 (permalink)
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Quote:
Originally Posted by nukeduster,Jun 26 2005, 08:02 AM
Quote:
Originally Posted by Kowalski,Jun 25 2005, 10:50 PM
just have to tune your AFM to know that there are bigger injectors there.
[snapback]357074[/snapback]
doesn't the computer do that for you?
[snapback]357117[/snapback]
no. it does to a point but not for big injectors.

you have to pull off the blue plug on the afm and turn it CCW to lean it out. otherwise you'll get a check engine light every time you have the throttle constantly at any position (cruise control on, idling at a stop light, etc) and you'll run overly rich.
[snapback]357156[/snapback]
[/quote]


can you post up some pics of what your talking about? which blue plug? i have some 19lbers im putting in will it configure it enough for this or am i going to have to do that manualy as your speeking about. i have an M42 so my plugs on the afm are differnt its a round conector.
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