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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 11-25-2003, 05:49 PM   #1 (permalink)
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Hey guys been a while, but .. im pretty sure i made an account here but for some reason i couldn't log on. Oh well but hi well i just resurfaced my Heads on my '84 325e and port polished them mostly done at home, but i know as much as . hmmm what i read and see. I'm new to being mechanic and all but willing to learn, what i read was to actually get power for the 325e was to replace the headers with 325i headers but keep the 325e bottom crank, which sounds expensive maybe you guys can give me some opinions?. What i'm planning to do is get a cone filter and build a heat shield research an ECU and maybe even an exhaust system. Please i'm open for opinion, i'm a full time student with an avg budget but plenty of time so.....please all suggestions welcome
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Old 11-26-2003, 10:18 AM   #2 (permalink)
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Two things will wake that car up.

Get a chip for the ECU, they are around $50 on E-Bay.

Get a gear ratio change for the differential.

You can use any of the following with a better ratio.

The ratio is on a tag on the aft face of the differential.

The OE 1984 eta was a 2.79 to 1.

I recommend 3.25 to 3.73 to 1.

You can use a differential from any of the following cars
e30-6, e28, e24, z3

Here is a link for reference as to the possibles.

http://www.bmwe30.net/cgi-bin/datacgi/data...0025&Section=03

Later,
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Old 11-27-2003, 06:51 PM   #3 (permalink)
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what about the cylinder head .... replacement ? with the 325i
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Old 11-27-2003, 07:04 PM   #4 (permalink)
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whoops not ...cylinder head.. the head just head replacement from Eta to I
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Old 11-28-2003, 02:54 AM   #5 (permalink)
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carter's right... but i don't agree 100%...

first off, get a chip from turner motorsport, not an ebay chip... bunch of little reasons why i'd rather go to turner, bav auto, or some other tuner than ebay

second, i wouldn't go any higher than a 3.45lsd in the rear. any higher than that & you're really hurtin your gas milage more than you probably want for a street car.

third... yes... you can do a 325i head swap. it's not a direct bolt on though & works better w/ a 325i intake manifold, TB etc. my plans involve picking up a beat 325i & rebuilding the engine w/ an eta crankshaft, eta connecting rods & either euro eta (1st choice) or super eta pistons. that'll HOPFULLY put me somewhere around 185-190hp & 210 or so ft/lbs if i do it right

although, since we're both pretty much in the same boat right now as far as mods (all i have is a bav auto chip, which i'm plenty happy w/), i suggest doing suspension work first, then going to more serious engine mods
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Old 11-28-2003, 11:01 PM   #6 (permalink)
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well put it this way if u go to e30 networks they have the instructions ... and i'm done with the tear down part because i got my heads resurfaced and replacing my headgasket unit whole kit ..so its "naked" right now email me with some tips plz oreo pogiboy9@hotmail.com thnx if u have "AIM" it'd be helpful too
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Old 12-01-2003, 04:57 PM   #7 (permalink)
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Quote:
Originally posted by pogiboy9@Nov 29 2003, 02:41 AM
well put it this way if u go to e30 networks they have the instructions ... and i'm done with the tear down part because i got my heads resurfaced and replacing my headgasket unit whole kit ..so its "naked" right now email me with some tips plz oreo pogiboy9@hotmail.com thnx if u have "AIM" it'd be helpful too
.... yeah i have AIM... see the little button below my sig? looks like this "" ... click it
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Old 12-04-2003, 01:16 PM   #8 (permalink)
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Thanks Oreo for the site link, i just remembered thats the site i got the idea from in the first place hahah forgot it .. lol
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Old 04-26-2004, 03:38 PM   #9 (permalink)
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Do you have ag uide for repairng the headgasket?
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Old 04-26-2004, 05:12 PM   #10 (permalink)
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Putting the i head on an e block will decrease power, you will need pistons and other stuff to, a chip is good, and shave the head for more compression. i shaved mine about 30 thou and am at 9.5:1 Compression. Look for mid range power, don't try and make it have top end, the motor is not designed for that. with a little work a eta can be pretty quick. Mine does 0-60 in about 7.5 sec. i still want headers and an different diff, with a cool air intake as well.

There used to be a really good article on the e30 zone about the head swap. It doesn't seem to be there anymore. Maybe someone else has it and can post it. It basicly says that the e block has flat topped pistons, and therefore flat chambers in the head, the i block has domed pistons, and therefore the head chambers are domed. So just adding the head with signifiganly drop comression, do to the extra space in the chamber for the domed shape. I'm pretty sure thats the story, maybe someone else can confirm it.
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Old 04-26-2004, 07:04 PM   #11 (permalink)
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is 325e a 2.7l
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Old 04-26-2004, 07:27 PM   #12 (permalink)
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Quote:
Originally posted by CiscoKid@Apr 26 2004, 07:44 PM
is 325e a 2.7l
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Old 05-03-2004, 09:32 PM   #13 (permalink)
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Hey, not too sure if I am using this right, but hey... I have a '87 325e..and recently aquired a '91 wrecked 325i ...the engine is pretty much distroyedwith the exception of the head and intake..everyone tells me that the head will NOT change over to my "E" because of lowering my compression to 7.1.. but will I get anywhere with changing the cam and double valve springs? I have ordered a chip(EBAY) sorry!, I guess that might not be a smart move after loking on this site.

Thanks
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Old 05-03-2004, 10:26 PM   #14 (permalink)
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Quote:
Originally posted by Lexluthor@May 3 2004, 10:12 PM
Hey, not too sure if I am using this right, but hey... I have a '87 325e..and recently aquired a '91 wrecked 325i ...the engine is pretty much distroyedwith the exception of the head and intake..everyone tells me that the head will NOT change over to my "E" because of lowering my compression to 7.1.. but will I get anywhere with changing the cam and double valve springs? I have ordered a chip(EBAY) sorry!, I guess that might not be a smart move after loking on this site.

Thanks
Rick
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i got a cheap chip from ebay for my eta made a big difference
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Old 05-03-2004, 10:48 PM   #15 (permalink)
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From what I am seeing there is a difference between a 325 and a 325e.. apparently a 325 has 127hp...and a 325e has 121hp...is this right? I have a '87 o ethe deck lid it says 325...does this mean I have the big 127?

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