1.3 Motronic Up-Grade & 2.7i How To

[rcfanatic]

Hey guys,
I have a few questions about the list of necessary parts that Kenika65/EtaSport acquired.

1.) Did you switch out all of these parts at once, or one at a time? If you didn't do them one at a time how do you know which ones are necessary?

2.) Do you know why the 173 ecu cannot take the signal from the older (rear) crank position sensors?

3.) What is it about the i injectors that make them necessary? Are they of a different resistance?

Thanks!

[mfing fbm]

i am planning on building a 2.7 stroker with 2.7 crank, 2.5 rods and "i" head. my question is, does anyone know the best place to get pistons for this setup? or does anyone have a part number or a custom piston build number and from what piston company?
:up:

[mikegar]

Love that intake manifold. Where is that manifold from?

it looks like a 323i

[mikegar]

Is there any picture where extra 3 oil channels are drilled in eta-head ?

Is it possible to use old gearbox sensors (m 1.0 basic) with m 1.3 ?

thanks in advance

by gearbox sensors im assuming you mean the sensors on the bellhousing. the i (mototronic 1.3) doesnt use the sensors on the bellhousing for crank position. they have their crank position sensor on the on the front. so to answer your question, no. as far as pictures i dont have any. hope that helps.

[spirit_of_mind]

Is there any picture where extra 3 oil channels are drilled in eta-head ?

Is it possible to use old gearbox sensors (m 1.0 basic) with m 1.3 ?

thanks in advance

[euromk2]

Love that intake manifold. Where is that manifold from?

[Holland]

Correct me if I'm wrong, But can't you use a M52 crank to make it a 2.8?

[morerevsm3]

just completed 327is conversion on my 86 325e, only problem is tacho doesn't work.
I used 731 head and cam, plus all the conversion parts from classifed section here on REVS (http://www.r3vlimited.com/board/showthread.php?t=126308), 02 sensor doesn't work either, runs like a pig when warm, so disconnected it, racing the car next weekend, will be interesting to see how it compares to the 325i race cars

[Mike]

Anybody know if the front balancers have different trigger marks, for super e, and I's? I am hearing that the pulley size is different, but how about the crank referencing? My 2.8 seems like the ignition is off, but am not really sure. I am running an I balancer on it with a new reference sensor. Realoem confirms they are indeed different part numbers.

[GOOBER]

Yeah I've actually sourced all the parts for like 400 bucks! It's gonna have the "i" intake, head, throttle body, afm, and the 173ecu with a mark d chip - which I'm getting from a friend (got 17lb injectors too). Should haul eta ass when I'm done.

Kind of in pieces at the moment because I'm doing a full suspension overhaul as well as a bumper swap but here's what it looked like over the summer when I first got it.

[kenika65]

Goober just throw the 173ecu.

Then find and build up an i head, port and polish and throw it and an i intake on there and your good to go.

But you can put the 173ecu in and be done if you want just remember you only have single valve springs so dont cry when you break one holding rpms over 6k.

any pics of your seta?

[Ruffian]

I don't think I've seen this thread before...good contributions all around.

My 327i is a high compression eta euro block with the 731 head and a port matched eta intake. I've toyed with the idea of upgrading the motronic, but i'm leaning toward the "not broke, don't fix it" school, and I run a mechanical distributor with vacuum advanced timing. It would be fun to get it on a dyno, then swap in the motronic upgrade and "i" intake, fuel delivery and spark management to see if there's any change worth noting.

[GOOBER]

I was gonna look for a later ecu the 173, I found an '88 "i" car though with pretty much everything I would need.

[nando]

there is no '85 i motor.

you can use any head/intake etc off an M20B25. I would be looking for parts off an 89 or later though, the earlier cars came with 153 ecus which aren't very reliable and lack any aftermarket. I believe you can use your existing harness and sensors, but you will need the AFM off an i motor.

[GOOBER]

Awesome thread! I've got an '88 seta and was looking for some cheap performance gains! Currently the car is running like shit but I think it has to do with a bad ecu. Question: If I get all the "i" parts does it matter what year it's off of? Can I use and early head off an '85 or does it have to be later?