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Author Topic: DIY Full OBC Retrofit  (Read 45638 times)

Zoso

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DIY Full OBC Retrofit
« Reply #15 on: April 17, 2006, 08:14:48 PM »
Glad to hear you put my writeup to use!  The retrofit really isn't that tough, is it?

The speed limit and the MPG have been right on for me.

Interesting about the speed limit.  I have heard that BMW speedos can be off by a few percentages.  The speed limit on my M3 is 140MPH, but it always kicks in at 136 or 137 :)

Regarding the MPG feature, try this.  Get on a long flat road or highway and get it to 25MPG exactly on the dash then reset the computer and see how it matches.   I'm curious if that'll match.

Do you have the stock cluster and the stock rear diff?
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m42 fan

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DIY Full OBC Retrofit
« Reply #16 on: April 17, 2006, 09:00:41 PM »
Yep, cluster stock, diff stock 4.10 posi.

I'm leaning toward the cluster being off.  A few months ago as a test I reset the odometer as I passed a milepost on the highway.  It wound up being off by 1/2-3/4 of a tenth every mile.  I don't remember if it was reading high or low though.

I'm going to try the fuel economy test like you said, might be a couple of weeks though, since I'm riding my bike to school now that the weather has warmed up.

Brian
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Vladi

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DIY Full OBC Retrofit
« Reply #17 on: April 19, 2006, 07:53:44 AM »
The speed @ wich the OBC beeps is your real speed. The speedometer has a 10% error. (eg. @ 200km/h is actually 180km/h, 200 x 10/100=20km/h wich is you speedo error@200km/h)
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silverblades181

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DIY Full OBC Retrofit
« Reply #18 on: May 01, 2006, 05:44:23 PM »
Quote from: Vladi
The speed @ wich the OBC beeps is your real speed. The speedometer has a 10% error. (eg. @ 200km/h is actually 180km/h, 200 x 10/100=20km/h wich is you speedo error@200km/h)


I'd heard that BMW speedos were a bit optimistic but I always tought it wasn't more then 5 km/h...btw my car came with the 13 button OBC and I love it. L/100km is very useful, so is average speed and the speed limit for long trips.
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Vladi

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DIY Full OBC Retrofit
« Reply #19 on: May 16, 2006, 03:40:57 AM »
The optimism of the speedo depends on your tire size. ;)
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dude8383

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« Reply #20 on: July 06, 2006, 02:50:36 PM »
Quote from: Zoso
Part number is 65 81 1 394 111.  Bavarian Autosport got it for me for... I can't remember exactly, but it was either $23 or $32.


ey mike, i finally got around to ordering the coding plug. BavAuto has em for $60 plus shipping..

Sooo i ordered from BMA. Cost me $52 shipped. Patrick is the man...
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Vladi

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DIY Full OBC Retrofit
« Reply #21 on: July 08, 2006, 06:02:02 PM »
In about two weeks i'm going to attempt to retrofit a full E36 OBC.(except the checkcontrol part which is a pain) :D
I've bought an E36 '94 M42 engine a month ago (to upgrade from my 316i) so i've practicly got the E36 electrics, ECU and everything. I'm 75% positive it will work. :D
I'll come back with detalis when it's done. ;)
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dude8383

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« Reply #22 on: July 08, 2006, 07:48:09 PM »
Quote from: Vladi
In about two weeks i'm going to attempt to retrofit a full E36 OBC.(except the checkcontrol part which is a pain) :D
I've bought an E36 '94 M42 engine a month ago (to upgrade from my 316i) so i've practicly got the E36 electrics, ECU and everything. I'm 75% positive it will work. :D
I'll come back with detalis when it's done. ;)


NICE! Come back soon lol...i was thinking about the compatibility issues but lets see how you manage!
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doigal

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« Reply #23 on: July 08, 2006, 10:46:21 PM »
Quote from: Vladi
In about two weeks i'm going to attempt to retrofit a full E36 OBC.(except the checkcontrol part which is a pain) :D
I've bought an E36 '94 M42 engine a month ago (to upgrade from my 316i) so i've practicly got the E36 electrics, ECU and everything. I'm 75% positive it will work. :D
I'll come back with detalis when it's done. ;)


About to do a simular engine swap in a couple of months time. Whats the advantage of the e36 obc?
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dude8383

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« Reply #24 on: July 09, 2006, 03:31:09 AM »
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Vladi

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DIY Full OBC Retrofit
« Reply #25 on: July 10, 2006, 01:11:44 PM »
Quote from: dude8383
NICE! Come back soon lol...i was thinking about the compatibility issues but lets see how you manage!


Please do share your thoughts! Any comment/feedback is welcome. :)
Right now i'm thinking to replace my E30 instrument cluster with the E36 one. :D
The electrics isn't a problem, the physical part is the problem. I'm thniking of some sort of way to mould the E36 instrument cluster in the E30 dashboard.
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doigal

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« Reply #26 on: July 10, 2006, 08:53:45 PM »
Just a though - take the innards of the e36 and put them in the e30 case... might work!
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Vladi

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DIY Full OBC Retrofit
« Reply #27 on: July 24, 2006, 08:41:05 AM »
Ok, gave up on the E36 instrument cluster. :D
Anyway, i installed my E36 OBC in my E30 yesterday...YES, with my M40 engine and it all works accuretly! :D Wohooo!
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dude8383

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DIY Full OBC Retrofit
« Reply #28 on: July 24, 2006, 03:06:04 PM »
Quote from: Vladi
Ok, gave up on the E36 instrument cluster. :D
Anyway, i installed my E36 OBC in my E30 yesterday...YES, with my M40 engine and it all works accuretly! :D Wohooo!


PICS!!!
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Febi Guibo

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DIY Full OBC Retrofit
« Reply #29 on: July 24, 2006, 03:17:16 PM »
we need pics...

also, I think E46 gauges are the same diameter as ours, if that helps any (prolly doesn't, haha)
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