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Old 04-18-2004, 04:33 PM   #1
burnhard22
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Lightbulb M3 1995 Injectors

Will '95 M3 injectors work in a 325is m20?
Let me know ?
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Old 04-18-2004, 04:49 PM   #2
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Yes, they will. You should also run a AFPR with them.
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Old 04-18-2004, 05:08 PM   #3
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pls explain?
right now I'm running lean around 4000rpm while in boost.
I have people saying to upgrade injectors which I have but someone also mentioned to get my programn'g (ecu) done 1st or injectors may cause more probs then I already have?
need a hand?
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Old 04-18-2004, 06:37 PM   #4
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Are you running a turbo setup with stock fuel pressure? You need to bump up the fuel pressure when you give the engine boost.

95 M3 injectors are a direct swap for the stock m20 ones. That is easy, but you will have to up the fuel pressure.

Buy a good Adjustable Fuel Pressure Regulator.
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Old 04-19-2004, 10:55 PM   #5
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Hey, I've got a question....what is the effect if you bump up the size of the injectors on an m20 and then dial down the fuel pressure slightly?


The reason I ask is because I put in larger injectors 19lb/hr, and its running too rich now at lower rpms....so I was planning on backing off the fuel pressure slightly to maybe 2.5bar
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Old 04-19-2004, 11:45 PM   #6
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Quote:
Originally posted by chromius_e30
Hey, I've got a question....what is the effect if you bump up the size of the injectors on an m20 and then dial down the fuel pressure slightly?


The reason I ask is because I put in larger injectors 19lb/hr, and its running too rich now at lower rpms....so I was planning on backing off the fuel pressure slightly to maybe 2.5bar
You upgraded the injectors in your 325e? Did you use the right impedence injectors? Why on earth would you upgrade them in the first place, they provide more then enough fuel to feed the HP output of a 325e.

Also, replacing the stock 325e injectors with the incorrect impedence ones (say ones from a 325i, or a m50 family motor) will burn up your ECU.
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Old 04-20-2004, 08:42 PM   #7
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Quote:
Originally posted by Jordan
You upgraded the injectors in your 325e? Did you use the right impedence injectors? Why on earth would you upgrade them in the first place, they provide more then enough fuel to feed the HP output of a 325e.

Also, replacing the stock 325e injectors with the incorrect impedence ones (say ones from a 325i, or a m50 family motor) will burn up your ECU.
Impedance is not the problem, I have the right impedance....low res...2-3ohm....the reason they were upgraded is because the stock ones were leaning out at high rpm....and now the high rpm is fine, but its running too rich at low RPM ie(idle)
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Old 04-20-2004, 11:38 PM   #8
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What are you talking about "high rpm" in reference to a 325e lol.

You can try putting a 325i FPR on, but that will most likely restore your previous problem.

If the 3.0FPR and the injectors are all working properly, there is no reason for a 325e to be running lean at 5k rpms.
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Old 04-21-2004, 03:11 PM   #9
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it leans about 4500-5700 RPM and the stock FPR is fine, I checked the pressure.
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Old 04-22-2004, 10:45 PM   #10
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thanx

Thanx for the info and I may need abit more.
I am running a turbo and have upgraded the fuel press regulator and am pushing more fule in to the STOCK injectors. I have people telling me it's a programming issue and some saying it could be the injectors or both. I am currently working on the programing issue with a freind and have not changed to the M3 '95 injectors as I was told it may be more headaches until the programming is complete. The problem I'm having is running lean at 4000rpm while in boost. It is fine if you are easy on the throttle-she will go all the way thru but the problem/lean comes when you hammer down..always at 4000-4200rpm and no where else?
Help and thoughts?
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Old 04-23-2004, 02:19 AM   #11
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Stock 325i injectors running at 100% Duty Cycle can flow enough fuel to feed a m20 developing 175hp or so. The stock injectors are proper for a stock or mildly modded engine (CIA, chip, exhaust etc) Any more mods then that... its time to upgrade the injectors.

Incase that was too much for you let me make it simple.

If engine potential power output > 175hp = UPGRADE YOUR INJECTORS.
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Old 04-23-2004, 03:00 AM   #12
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95 M3 injectors are good upgrades: 17#

But I got 19# injectors if you need them, PM me. I was going to use them, but I decided to keep my B25 stock.
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