So If I Have A Full Super ETA Engine...

[Ben Carufel]

What parts do I need to make a stroker? I've heard stuff for years about putting some super ETA parts with "i" parts and coming up with an oem-parts stroker, but I've never researched it at all.

[digger]

to stroke a 2.7 you need a bigger crank but thats just a technicality.

i believe double valve springs are one part thats recomended

[pdx 528e]

You need some parts from a 325i:
at minimum:
cylinder head, ECU
recommended:
intake manifold, injectors, FPR, AFM, throttle body, exhaust system

This only works for super eta engines, not standard etas.

[nando]

you don't need a new cylinder head, the super ETA has the same head casting as the 325i. all you need are dual valve springs, an i cam, and drill the oil journals for the 7 bearing i cam. best replace your rocker arms and eccentrics while you are at it, plus probably new valve guides and a good valve job.

[erik325i]

What parts do I need to make a stroker?

you don't need a new cylinder head, the super ETA has the same head casting as the 325i. all you need are dual valve springs, an i cam, and drill the oil journals for the 7 bearing i cam. best replace your rocker arms and eccentrics while you are at it, plus probably new valve guides and a good valve job.

How is this a stroker? He is still using the stock crank, therefore his stroke is the same. The displacement is staying at the stock 2.7L...

He is simply changing a cam and valve springs, not building a stroker.

-Erik

[pdx 528e]

Yes, referring to this setup as a stroker is a misnomer but its the same end result as those with 325i's who actually do stroke their motor with an eta crank. I wasn't going to split the hair.

I would think its less labor intensive to slap on a good 885 head than actually have the head drilled for the extra cam journals, etc. The head already has to come off to drill and change cams, just work with a 325i head for less downtime.

[SpecM]

-The exhaust sytem and DME systems are the same. You just need a stock 325i chip... or just get and aftermarket one. And go ahead and go for 19# injectors and a m30 AFM.

[pdx 528e]

-The exhaust sytem and DME systems are the same. You just need a stock 325i chip... or just get and aftermarket one. And go ahead and go for 19# injectors and a m30 AFM.

This is great news regarding the ECU. Is there a resource that mentions this? One less part I need to buy.

[C ///M]

you don't need a new cylinder head, the super ETA has the same head casting as the 325i. all you need are dual valve springs, an i cam, and drill the oil journals for the 7 bearing i cam. best replace your rocker arms and eccentrics while you are at it, plus probably new valve guides and a good valve job.

To help clarify, this is exactly what you need to do. This will yield a "2.7l i stroker".

In addition, you'd simply need an "i" chip. I'm pretty sure that '88's and up used motronic 1.3, so you should just pick up a 173 "i" chip and call it good.

**Did a quick search, not sure if super eta's used motronic 1.1 or 1.3. If I had to do it, I'd just pick up a complete 173 325i DME and throw in a conforti chip**

[Jand3rson]

To help clarify, this is exactly what you need to do. This will yield a "2.7l i stroker".

In addition, you'd simply need an "i" chip. I'm pretty sure that '88's and up used motronic 1.3, so you should just pick up a 173 "i" chip and call it good.

If I'm not mistaken, you'd also need a 325i intake manifold and throttle body, correct?

Did a quick search, not sure if super eta's used motronic 1.1 or 1.3. If I had to do it, I'd just pick up a complete 173 325i DME and throw in a conforti chip

Chris is correct here. I'm not sure of the Motronic system that the s-eta used, but i know that they used an ECU ending in 154, which Conforti did not make a chip for. In order to get the best (OEM) engine management, you would need the ECU from a 1.3 car, with a 173 ECU.

[PУCCKAЯ_e30ka]

ok... i think these are essential!
t-body
intake mani
i-head (without the mastrubation of supere head drilling blah blah...)
ecu
injectors

following would be plus+
exhaust
afm
headers
afpr
chip

even better plus+
rebuild head with little higher comp and smoothed/worked

[C ///M]

Josh is right, you need the intake manifold and throttle body as well.

The super eta, as already mentioned, already comes with an "i" head. It simply uses an eta cam with single valve springs. You need to pick up an "i" cam and dual valve springs and have the additional oil journals drilled.

Summary to convert super eta into 2.7liter "i" motor:
-"i" cam and dual valve springs with additional oil journals drilled
-"i" intake manifold and throttle body
-"i" center section (dual pipe after cats) and muffler (the exhaust manifolds are the same)
-"i" 173 ecu and chip

With the switch to the 173 ecu, I'm not sure what goes on with the fuel injectors. I know "i" injectors and "eta" injectors were different. (low impedance vs. high impedance.)

[Jand3rson]

With the switch to the 173 ecu, I'm not sure what goes on with the fuel injectors. I know "i" injectors and "eta" injectors were different. (low impedance vs. high impedance.)

You would need the 325i fuel injectors.

[nando]

How is this a stroker? He is still using the stock crank, therefore his stroke is the same. The displacement is staying at the stock 2.7L...

He is simply changing a cam and valve springs, not building a stroker.

-Erik

I never said anything about a stroker in my post ;)

[SchnellerVert]

I never said anything about a stroker in my post ;)

Ben did thou.