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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 05-23-2006, 11:14 AM   #1 (permalink)
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What Would Happen?

What would happen if i was to bolt on an "I" intake manifold and injectors to my 325es? Would that help performance at all?
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Old 05-23-2006, 05:31 PM   #2 (permalink)
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dunno.used: although, starmavin posted something a while back about putting mustang injectors into our cars, supposed to get better gas mileage, atomization (sp) and stuff like that.
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Old 05-25-2006, 02:09 PM   #3 (permalink)
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It would not work!

E injectors are low impedence 19lb/hr, I injectors are High impedence 14lb/hr.

The engine managment would also have to be changed to account for the low impedance to high impedence swap.

You may be able to swap to an "i" manifold with "e" injectors and see a minimal gain as the "i" manifold is supposed to flow a little better.
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Old 05-25-2006, 09:27 PM   #4 (permalink)
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Yea thats what i heard... I'm thinkin about gettin just the I manifold and an M30 AFM, but I've heard mixed stories about swapping the internals of the AFM.
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Old 05-25-2006, 10:46 PM   #5 (permalink)
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http://www.bmwe30.net/cgi-bin/datacg...001&Section=03

^^^ i would just do that mod if i were you... save up for it...
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Old 05-25-2006, 11:16 PM   #6 (permalink)
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O yea i considered that a while back, im too lazy to do that, lol. I would like to eventually though. Would i have to get a custom chip so i can increase the revs past 5300?
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Old 05-25-2006, 11:20 PM   #7 (permalink)
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i believe so... but a custom chip would also turn out in even higher increases in power...
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Old 05-25-2006, 11:24 PM   #8 (permalink)
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Thats true, i really want to get an i manifold and m30 afm. and if i can gather enough energy and money i will do a cam swap
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Old 05-25-2006, 11:34 PM   #9 (permalink)
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yeah gopher it... ethier that or just swap in a 6...
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Old 05-26-2006, 08:52 AM   #10 (permalink)
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^^It IS an I6, weirdo.
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Old 05-26-2006, 09:02 AM   #11 (permalink)
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Wouldn't do much, with out the larger head ports the flow would actually slow down, think of it like having a 2 1/4" exhaust going into a 1 1/2" muffler. Plus the injectors would be spraying right on the edge of the intake port and not into the port itself, and to make matters worse you'll have a little pocket at the head where the bottom of the intake runner is larger than the port where fuel and/or oil can collect causing the motor to desiel (the car sputtering after you shut the car off).
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Old 05-26-2006, 09:27 AM   #12 (permalink)
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Well that bursted my bubble.. thanks for the info though. What about just the m30 afm?
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Old 05-26-2006, 10:21 AM   #13 (permalink)
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So long as the last 3 digits of the M30 AFM are 027 it should work just fine in the 325e/es, however an adjustable fuel pressure reg is needed as the larger M30 AFM will make your motor run a tad lean.

To use the M30 AFM correctly in the 325I motors you'll need to transfer all the M20 guts to it. Not very hard but a delicate pain in the ass, pluss the screws don't want to come out (BMW screw glue really works).

All in all, the larger M30 AFM will give you about 5hp.
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Old 05-26-2006, 02:40 PM   #14 (permalink)
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Quote:
Originally Posted by JoeMadoo
O yea i considered that a while back, im too lazy to do that, lol. I would like to eventually though. Would i have to get a custom chip so i can increase the revs past 5300?
To rev past 5300 in an eta is not a good idea with the single valve spirng design I can alsmost gaurantee you would float the valves at that kind of rpm.
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Old 05-26-2006, 02:50 PM   #15 (permalink)
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Well the dual valve springs were a givin with the cam swap.
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