Fixing up an S62 before plunking it into an E34 - Page 23 - BMW M5 Forum and M6 Forums
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post #221 of 234 Old 21st September 2018, 07:48 PM Thread Starter
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Quote:
Originally Posted by terraphantm View Post
Maybe just run the one then. The dme doubles the maf value if only one signal is present.
You're kidding, right? I may just have to bash my head in if you're serious!

I had no idea, that would simplify my life a hundredfold. Which bank gets the IAT reading?
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post #222 of 234 Old 22nd September 2018, 01:13 AM
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You still need two tubes to not create high vacuum. If you have two tubes you can also run the two MAFs in a single tube so you don't have to re code the DME error from only having one.


This is sort of making me happy I spent 1200 redoing the sub frame to move the motor back an inch and down a half. It is also really pretty with its powder coat not that anyone will see that.
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post #223 of 234 Old 13th October 2018, 03:36 AM Thread Starter
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Overdue update: I've barely driven the car while I've been battling two massive leaks. One, power steering fluid, was caused by a faulty -6AN fitting.

The other is oil, looks like a combination of bad valve cover gasket (very disappointing) and also from a -10AN fitting on the oil lines I had made from the filter housing to the engine mount arm.
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post #224 of 234 Old 18th October 2018, 10:43 PM Thread Starter
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I'm struggling with a starting/possibly charging problem.

As of this morning, I've gone through 3 failed starter motors since July. I'm wondering if the fact that I use the M5's 120A alternator has something to do with this (original E34 is 140A). My lights do flicker a bit at idle, it's barely noticeable and goes away as soon as I hit 1000 rpm.

My battery is healthy, and aside from the starters failing to crank altogether, never had a hard start.
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post #225 of 234 Old 18th October 2018, 11:33 PM
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I had forgotten how fickle the E34 electrical was! I recall having to upgrade my alternator when I did the M52 swap.
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post #226 of 234 Old 19th October 2018, 05:22 PM
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Starters don't fail like that. Something is weird maybe the starter should get a postmortem to determine what is killing them. If the starter never got slow just died sounds like the electricity is flowing through wrong, is the motor got a good ground strap on it?
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post #227 of 234 Old 19th October 2018, 05:23 PM Thread Starter
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I had forgotten how fickle the E34 electrical was! I recall having to upgrade my alternator when I did the M52 swap.
Argh. I wish I had thought of that before spending all that money on an alternator rebuild.

Anyone know of a 140A+ alternator for the S62? My searching so far has proven itself fruitless.
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post #228 of 234 Old 19th October 2018, 11:00 PM
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I know I upgraded but it's been far too long to remember what I went with so don't take that as the gospel. But I "think" you are on the right track.
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post #229 of 234 Old 20th October 2018, 02:05 AM Thread Starter
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Thanks. I'm going to try to find an alternator repair place to rewind it with additional coils. Hopefully I can squeeze out a few more amps.
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post #230 of 234 Old 22nd October 2018, 03:59 AM
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Quote:
Originally Posted by TSI View Post
Argh. I wish I had thought of that before spending all that money on an alternator rebuild.

Anyone know of a 140A+ alternator for the S62? My searching so far has proven itself fruitless.
The M5 alternator apparently bolted onto this guy's 528i: https://www.bimmerfest.com/forums/sh...82&postcount=2

Which if true probably means M54 alternators could bolt onto the S62. I believe the most powerful of those is 155A model (part number 12317541696). Technically those alternators use some fancy serial interface for diagnositcs and have a different connector, but I've heard of people changing their connector and using the alternator without issue

Otherwise there's a 140A alternator from the X5 3.0i (part number 12317551253) with the same connector as the stock S62 connector
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