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1.3 Motronic Up-Grade & 2.7i How To

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  • Andy.B
    replied
    -How many miles on your bottom end (assuming untouched)?
    225k before the swap.

    -Did you upgrade the cam, i.e..274, etc. ?
    I bought my 885 head from BimmerHeads with a regrind 272 cam

    -Does an upgraded cam require hd rockers?
    BimmerHeads head came with HD rockers. I don't think they are strictly necessary with a stock cam.

    -What rpm does power drop off after the swap?
    My power bands sweet spot is 3.2k to 6k. It feels stock in the lower rpm's, pulls like a monster, then starts to drop off after 6k.

    -Does the motor feel right in upper RPMs?
    It feels awesome. Better than stock 2.5, but I'm sure that's more to do with the cam than the displacement.

    Leave a comment:


  • jayuuey
    replied
    For the folks that completed the swap,
    -How many miles on your bottom end (assuming untouched)?
    -Did you upgrade the cam, i.e..274, etc. ?
    -Does an upgraded cam require hd rockers?
    -What rpm does power drop off after the swap?
    -Does the motor feel right in upper RPMs?

    Thanks!

    Leave a comment:


  • Swanny
    replied
    Originally posted by StereoInstaller1 View Post
    Thanks... Sometimes it takes longer for me to find stuff I wrote than anyone else, I swear

    Hope it helps!

    Found it!






    And here are other related threads for tach wiring and the c104 connector






    One of the better pinout references i've seen

    Leave a comment:


  • StereoInstaller1
    replied
    Thanks... Sometimes it takes longer for me to find stuff I wrote than anyone else, I swear

    Hope it helps!

    Leave a comment:


  • Swanny
    replied
    Originally posted by Panda_kRz View Post
    Hey guys, sorry didn't want to go through the whole thread looking for a simple answer, but if a 1987 325(e) comes with a 15 pin connector up front, it is a 1.0 motronic, correct? Also is there a DIY/guide for swapping the 1.0 to 1.1/1.3? The first page didn't really specific on how to do so, thanks.

    Here you go http://www.r3vlimited.com/board/showthread.php?t=100939

    Leave a comment:


  • Panda_kRz
    replied
    Hey guys, sorry didn't want to go through the whole thread looking for a simple answer, but if a 1987 325(e) comes with a 15 pin connector up front, it is a 1.0 motronic, correct? Also is there a DIY/guide for swapping the 1.0 to 1.1/1.3? The first page didn't really specific on how to do so, thanks.

    Leave a comment:


  • Swanny
    replied
    Originally posted by StereoInstaller1 View Post
    I did a write up on how to fix that, been a couple years tho, so it's buried.

    Yeah i saw it when doing research on the swap. Will dig around and repost.

    Leave a comment:


  • StereoInstaller1
    replied
    Originally posted by Swanny View Post
    You'd know right away if you had a late model harness since there'd be a removable connector for the injector harness. The 87 had a goofy 3 plug wire that i believe went to the tack and obc that was on the glove box side of things. I'm trying to hunt down the differences between the harnesses myself since my body harness is an 87 and the engine harness is an 89.
    I did a write up on how to fix that, been a couple years tho, so it's buried.

    Leave a comment:


  • Maad325
    replied
    Originally posted by EtaSport View Post
    well most of the wires are color coded. you only really need to hook up the yellow/black start input wire, the green ignition wire and the black/green unloader to get it to start. what you need is the bmw etm wiring diagrams to find out which pins are which. you should be able to find them in the forums though.. search c101
    Where did you hook up these wires? I just finished my swap and it's currently getting no spark.

    Sent from my SM-N900V using Tapatalk

    Leave a comment:


  • Swanny
    replied
    You'd know right away if you had a late model harness since there'd be a removable connector for the injector harness. The 87 had a goofy 3 plug wire that i believe went to the tack and obc that was on the glove box side of things. I'm trying to hunt down the differences between the harnesses myself since my body harness is an 87 and the engine harness is an 89.

    Leave a comment:


  • jayuuey
    replied
    Thanks for the last two posts.

    Andy,
    do you have a picture of your engine harness on the ecu plug end? Im wondering if i actually have an 87i harness or not. Mine has a 3 wire plug (2 wires in one section and 1 wire in another. Does that sound right?



    Originally posted by Andy.B View Post
    I just did this swap, and also used an 87 I harness in my 87 e. It is the easiest possible combination, because you shouldn't have to cut and splice anything. Your current oil level sensor will plug into the 87 i harness. You need a new o2 sensor anyway, so just buy the right one (the small 4 wire plug, not the larger screw type plug). And for the oil pressure sensor, they are cheap enough to just buy a new one ( about $10).

    And since you are using the same year harness, you don't even have to splice anything under the dashboard. Just plug in the 3 wire c104 from the motronic harness to the body harness and you're all set.
    (This only applies to the 87 325i harness in an eta AFAIk).

    Leave a comment:


  • Andy.B
    replied
    Originally posted by jayuuey View Post
    I read through the thread but didnt really find what i was looking for. Can someone please break down how to splice in the oil level sensor, oil pressure, o2 sensor? Pics, wire colors, etc would help a lot.

    I have an 87e and harness from 87i.

    Thanks in advance.
    I just did this swap, and also used an 87 I harness in my 87 e. It is the easiest possible combination, because you shouldn't have to cut and splice anything. Your current oil level sensor will plug into the 87 i harness. You need a new o2 sensor anyway, so just buy the right one (the small 4 wire plug, not the larger screw type plug). And for the oil pressure sensor, they are cheap enough to just buy a new one ( about $10).

    And since you are using the same year harness, you don't even have to splice anything under the dashboard. Just plug in the 3 wire c104 from the motronic harness to the body harness and you're all set.
    (This only applies to the 87 325i harness in an eta AFAIk).

    Leave a comment:


  • Regnar75
    replied
    ^ i wish i could be help when it comes to the oil level sensor, and oil pressure, but i just used the 325i oil pressure sensor that matched my harness, and didnt hook up oil level. the O2 sensor on the other hand i can help a bit. theres two types of o2 sensors, theres a 3 wire and a 4 wire....instead of typing im just going to paste what i already put in this thread.
    -O2 sensor, I used the 3 wire one that I had stock spliced it into a 1.3 female connector I grabbed from junkyard. Using e exhaust the I connector/o2 sensor will not reach without extending anyway. Look inside connector and find #1 mate that with #2 on the female connector. #2 with #3 and #3 with #4 respectively. Connector #1 on female end (grey wire) I didn't hook up, no issues yet.

    i put a bunch of notes on little issues i had on that one post, its on page 22 here. post #324.

    but if your going to use the I exhaust, just get a new O2 sensor, its a wear item anyway and you wont need to splice anything to get it to fit, but the I sensor is too short to reach the o2 location on the e exhaust so if your sticking with the e exhaust, grab an I o2 sensor from junkyard and cut the plug off (the one that plugs into your harness) splice o2 sensor (NOT HARNESS) to match the connector (stated in my post) and use that. or buy an I o2 sensor and just extend the wires to reach the o2 bung
    Last edited by Regnar75; 09-20-2014, 11:19 AM.

    Leave a comment:


  • jayuuey
    replied
    I read through the thread but didnt really find what i was looking for. Can someone please break down how to splice in the oil level sensor, oil pressure, o2 sensor? Pics, wire colors, etc would help a lot.

    I have an 87e and harness from 87i.

    Thanks in advance.

    Leave a comment:


  • Regnar75
    replied
    ^ actually in this sticky there are mentioned a few differences in the blocks



    but i dont think its anything to really concern yourself with. just for the knowledge

    Leave a comment:

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