Late model IS getrag 260 swap into early model eta

[Gaarath378]

Motherfucker, I cannot get this car to run. Ive got almost everything i would need for a motronic swap anyway, so i might as well try that next. Im pretty sure im running a 074 ecu rn because its a prod date 10/86 325 (e), best ecu for motronic 1.1 would be a 154 orange ecu right? Already have a wiring harness and some other doodads, I would just need to buy the cps pin stuff for the front end. Shame I just had that all apart. 1 step closer to parting this peice of shit out.

[Gaarath378]

Its possible that the cps sensors need work too, but at this point im more invested in the timing. Replaced the belt in 2020 so its about time to replace anyway, pulled everything in prep to check timing and its off by a tooth. More concerning, the belt has worn a track in the timing cover and the cover between where the distributor mounts to the toothed wheel has a mirror finish. The belt is currently tensioned and very taught, when I get home today im going to take off the belt (saw the wear and went inside, called it a night) and inspect for play in the gears and then also replace the tensioner just in case. Yes, I know how grimey my engine is, its getting a new thermostat and all new crank seals and valve cover.

[e30davie]

if you cant get it to work you could update it to the latest motronic with the 60-2 wheel on the front of the crank. that way you remove all flywheel sensors. bit of a shamozzle but well worth it. Just a single sensor then.

[reelizmpro]

Did you connect them to the correct harness connectors? They must connect to their respective connectors.

[Gaarath378]

The sensor holes you drilled in the transmission, are they in the same physical spot as the original trans?

Can you post some pictures?

yeah, ill post tonight - the tran had circles for where the sensors would go, as well as being thicker in that specific spot. Location shouldnt have changed, though who knows at this point.

[Panici]

The sensor holes you drilled in the transmission, are they in the same physical spot as the original trans?

Can you post some pictures?

[Gaarath378]

Ah, when I said "fighting against the starter", I meant that the engine is not firing at the correct time.
You can hear one of the cylinders fire off and the starter slows down.

You would expect a cyl firing to increase engine speed, not decrease. That is assuming it is firing at the right time, which is why I suggested that you have a timing issue.

Gotcha, thank you. My brain is so fried e30 wise. Ill check next time I get a chance, what could I have done wrong to mess with the timing? Only things I can think of would be flywheel misalignment or maybe spinning the engine the wrong way, both of which I dont think happened.

[Panici]

I agree, it does sound like its starter related.

Ah, when I said "fighting against the starter", I meant that the engine is not firing at the correct time.
You can hear one of the cylinders fire off and the starter slows down.

You would expect a cyl firing to increase engine speed, not decrease. That is assuming it is firing at the right time, which is why I suggested that you have a timing issue.

[Gaarath378]

Fighting against the starter at one point in your video

Been doing a lot of forum browsing at work today , I was initially going off of the RTS Auto swap guide. Looks like there may be some wiring alteration needed for the starter interlock not mentioned there. I agree, it does sound like its starter related. One of the techs here at work mentioned I could have displaced the metal sheet behind the flywheel, but I think thats unlikely. (not that I wouldnt fuck that up, more that I dont think the symptoms match well enough.)

[Panici]

Feels like timing related to me.

Fighting against the starter at one point in your video, and then suddenly stopping while running.

[Gaarath378]

Okay! Finally got the trans installed, lot of dilly dallying and pretending that I don't own an e30. The car runs like shit! Currently have it in the air, no driveshaft or exhaust installed besides headers. Car runs perfectly fine idling, but if i give it any juice at all it sputters and clanks and will stall if I accelerate too much. Its got a dual mass clutch, the CPS sensors are probably? not the issue, had to drill holes in the trans for them but they line up great and I don't think it would start if they weren't working. Not really sure whats wrong :( Hopefully I missed something obvious but I cant think of anything.

https://www.youtube.com/watch?v=A5heD5lxS8k

[82eye]

probably cheaper to find a stock single mass eta flywheel but that's the same idea.

[Gaarath378]

no difference in diameter but it does not have the reference pin needed for the cps and reference sensors the eta uses. there is/was a single mass eta alternative fw, iirc they were on 325 only or non badged cars, and/or the seta. pretty sure that's the route most took for this as the depth of the bellhousing should match up.

Okay, so I need to either drill and tap sensor holes, get the sensors needed and track down a seta flywheel, or sell my current g260 and find an early model eta trans. Something like this wouldnt work? Says that it has been tested on both eta and is models AND has the reference pins for the eta. Seems like a viable option https://www.turnermotorsport.com/p-2...wheel-kit-eta/

[82eye]

currently the one that came with my trans (probably an is flywheel) - i know that there is a difference in width between some of the flywheels, but is there a difference in diameter?

no difference in diameter but it does not have the reference pin needed for the cps and reference sensors the eta uses. there is/was a single mass eta alternative fw, iirc they were on 325 only or non badged cars, and/or the seta. pretty sure that's the route most took for this as the depth of the bellhousing should match up.

[Gaarath378]

What flywheel are you running? I do not think that a late 260 will fit over an eta flywheel.

currently the one that came with my trans (probably an is flywheel) - i know that there is a difference in width between some of the flywheels, but is there a difference in diameter?