best way to go about boosting a 325e?

[nickflic3]

The only raw wiring part is adapting the fuse box plug and there's a wiring diagram for that.

[sofargone561]

In that post it said the 325e pictons wont work with this head? i thought they didand the iunternals where good for like 400whp? im confused now?

[SkywayScraper]

I am doing the same thing with my eta. Look at this <http://www.r3vlimited.com/board/showthread.php?t=100939&highlight=eta+89+head>
You should be able to pick up these parts for less than $500.
Going boost takes time to learn and research but hopefully will be worth it.

[sofargone561]

I am doing the same thing with my eta. Look at this <http://www.r3vlimited.com/board/showthread.php?t=100939&highlight=eta+89+head>
You should be able to pick up these parts for less than $500.
Going boost takes time to learn and research but hopefully will be worth it.

link doesnt work and i expect it to take time but i didnt realize i have to change out the pistons and stuff. if i gotta do all that i think i might do one of those stroker builds and boost that.

[SkywayScraper]

Try copy and past

http://www.strictlyeta.net/technical/328i_1.html

This link is what I have been missing glad nickflic3 put it up

You dont have to change the pistons just slap the i head on with all the other stuff like intake manifold pulleys thermostat throttle body etc

[sofargone561]

Try copy and past

http://www.strictlyeta.net/technical/328i_1.html

This link is what I have been missing glad nickflic3 put it up

You dont have to change the pistons just slap the i head on with all the other stuff like intake manifold pulleys thermostat throttle body etc

Ok thats whata i was told to do but for some reason the build thread posted above said i needed to grind the pistons or something and this link works i copy and pasted it before and it didnt work

EDIT: thats the same link someone just posted



2.) What parts are needed?
For a complete and detailed list, see page 2. But generally speaking, for an 84-87 325e you need the entire fuel injection system from a 325i as well as the intake manifold, throttle body, and complete cylinder head (with cam, valves, and dual valve springs. However, the stock 325e pistons will not work with the 325i head because of the different design; the 325i has a domed cylinder chamber to match the domed pistons while the eta has a flat cylinder chamber to match the flat pistons. Throw the flat 325e pistons into a 325i head and you have a mismatch that causes a lower compression ratio, and this for this procedure, lowering is a bad thing. So that leaves you with 3 choices:

#1 is to use the pistons from a 1988 528e or 325 (Super Eta), which works fine but has a less than ideal compression ratio of 8.8:1. The good thing is that they are cheap if you can find them, but then again, they are used pistons and they aren't very commonplace since they were only available for one model year.

#2 is to use the 325i pistons and shave the top. 3mm is supposed to be the accepted tolerance with stock 325i rods, though I have also heard 2mm as well. Pete McHenry of Precision Performance Services in Winston-Salem, North Carolina (333) 761-0643 is the pioneer of this conversion and would know this information firsthand, as would Jim Rowe of Metric Mechanic in Richland, Missouri (573) 765-1269. There may be other BMW tuners, technicians, and machinists in your area who know this, so ask around.

#3 is to order a set of custom made pistons from companies such as JE, Arias, Kolbenschmidt, and Wiseco. While this is probably the most expensive route, you can customize exactly what type, compression, and size of piston you want. They can be ordered through a variety of vendors, including Ireland Engineering, Top End Performance, Metric Mechanic, and Redline Racing.

See it says i need to replace them with other ones, grind them or get custom ones made? =/

[SkywayScraper]

From what I have been reading you can use eta crank, rods, and pistons basically the whole bottom end. This does lower the compression because of the flat top pistons and the domed chambers on the 885 I head. This combination will work but its been said that it has a hard start and rough idle.

For the head swap link go to the search bar in this section (M20) and search 1.3 motronic up grade. It is were I have been getting my info

[sofargone561]

From what I have been reading you can use eta crank, rods, and pistons basically the whole bottom end. This does lower the compression because of the flat top pistons and the domed chambers on the 885 I head. This combination will work but its been said that it has a hard start and rough idle.

For the head swap link go to the search bar in this section (M20) and search 1.3 motronic up grade. It is were I have been getting my info

great ill do that search. I just want to make sure i dont fuck anything up or do something wrong. =/ im starting to kinda get turned off to this build. time to do more research and see if its worth it or if i should just swap something else and boost that =(

[SkywayScraper]

Yeah I know what you mean but I picked up all my stuff for the swap at a great deal from a buddy and I am building it for boost and with the lower compression it should work out fine.
whatever you do good luck

[sofargone561]

Yeah I know what you mean but I picked up all my stuff for the swap at a great deal from a buddy and I am building it for boost and with the lower compression it should work out fine.
whatever you do good luck

well i will be building for boost as well. so maybe keeping them will be better. Theres not way for them to hit the top the bottom of the head due to the difference in size and stuff?

[The Humjet]

Sorry to off topic Op is your car a coupe or sedan?

[euro2fast4u]

i think you guys are over thinking this. ill post answers to all your questions tomorrow morning

[sofargone561]

Sorry to off topic Op is your car a coupe or sedan?

1984 325e coupe manual. not off topic its still about my car lol =) i owned a 1987 4 door in Germany 325i with an lsd and some sexy wheels i loved that thing =/

i think you guys are over thinking this. ill post answers to all your questions tomorrow morning

i think i am other thinking it. please hook me up with some knowledge lol

[euro2fast4u]

make a list of questions and ill order them and of course ill go back through the last page and check those no time tonight

[sofargone561]

make a list of questions and ill order them and of course ill go back through the last page and check those no time tonight

Okay ill try im about to crash as well i think. got work tomorrow again =(
so far a lot of my questions are on here.