BMW V8 M62B44 - questions about ignition system

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impl
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BMW V8 M62B44 - questions about ignition system

Post by impl » Thu Oct 26, 2017 11:02 am

Hi all
I have e30 with m62b44 and will try to get it running with emu. I don't have experience with german technology, only with nissans rb,sr,ca.
So few questions ;)
1. Can i use stock coils with wasted spark ? I think, no. Can somebody confirm this ?
2. Do i need to wire crank+camshaft sensor ? Or only crank sensor is neccesary for wasted spark ?

RHD
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Re: BMW V8 M62B44 - questions about ignition system

Post by RHD » Thu Oct 26, 2017 12:33 pm

you only need crank sensor and will need to run waste spark because there are only 6 ignition drivers.
The new emu-classic will have no problem running 2 passive coils from one driver, the older version can do it also but the ignition drivers will be under a lot of load so keep your dwell time as low as you can

impl
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Re: BMW V8 M62B44 - questions about ignition system

Post by impl » Thu Nov 02, 2017 1:45 pm

That is good news, thx for your answer.
And another question ;)
Crank sensor - 2 wires black + white
black to sensor gnd ?
white signal to emu ?

Karel
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Re: BMW V8 M62B44 - questions about ignition system

Post by Karel » Thu Nov 02, 2017 3:52 pm

If you connect the Crank sensor in oposite way, you can just correct it in ECU, choosing rising/falling edge. So no big deal....
If irememnber, the white was signal and black was signal ground, and the shielding goes to chassis ground

impl
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Re: BMW V8 M62B44 - questions about ignition system

Post by impl » Thu Nov 02, 2017 11:09 pm

Karel wrote:
Thu Nov 02, 2017 3:52 pm
If you connect the Crank sensor in oposite way, you can just correct it in ECU, choosing rising/falling edge. So no big deal....
very helpful, didnt know that, thank you

and next question :) maybe the last one ;)
idle control valve, there are 3 pins
is it a 3 wire PWM, as described at page 96 in emu manual ?

impl
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Re: BMW V8 M62B44 - questions about ignition system

Post by impl » Wed Nov 08, 2017 11:23 pm

Engine starded :)
now i need to set the timing 100% correct
on crank balancer there is OT sign , this is TDC ?

Karel
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Re: BMW V8 M62B44 - questions about ignition system

Post by Karel » Thu Nov 09, 2017 12:32 pm

on BMW you have always "OIT" an the "I" is the mark

impl
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Re: BMW V8 M62B44 - questions about ignition system

Post by impl » Thu Nov 09, 2017 10:17 pm

it is very hard to look from good angle at signs, because of very tight fitment in e30 engine bay :(
but i think i set it properly, or very close
first trigger 3
triger angle 52

but then something strange happens
on idle about 700 rpm, ignition timing set to 12', and when i set to 13' engine dies, everytime - maybe my trigger is wrong ?
so my question, what is the correct ign. angle at idle for this engine ?
i dont have any ign. map for this engine to compare :(

Karel
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Re: BMW V8 M62B44 - questions about ignition system

Post by Karel » Thu Nov 09, 2017 11:00 pm

Everytime you change the trigger setup, it will need to resync again, so it will take some time until it fires again. So you will better set idle higher for this. Yes the BMW is the most user unfriendly for timing lamp.... i use always mirror on BMW, and it is still super tricky to get the correct position, angle and vision.... but it is possible

impl
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Re: BMW V8 M62B44 - questions about ignition system

Post by impl » Thu Nov 09, 2017 11:21 pm

thx for your answers
now i know that this troubles are "normal" ;) in nissan engines (which i love ;) ) timing marks are very visible and accurate

btw the radiator is leaking so i have to change it
so ... with the radiator removed i will get the better view :D
do you know the stock idle ignition timing for this motor ?

Karel
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Re: BMW V8 M62B44 - questions about ignition system

Post by Karel » Fri Nov 10, 2017 8:18 am

its up to you. I am personally fan of very low idle timimng, because the engine runs smoother, but you need more air for it

impl
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Re: BMW V8 M62B44 - questions about ignition system

Post by impl » Sun Nov 12, 2017 8:27 pm

i made new marks for timing, and now i have all set 99.9% correct ;)

engine runs, car drives, but clutch gave up :D
so i have to wait with final tune
the hardest thing to tune are enrichments - when on idle i put the accelerator to the floor, still have problems with it.

pepifebles
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Re: BMW V8 M62B44 - questions about ignition system

Post by pepifebles » Sun Jan 13, 2019 11:31 pm

Finally what was the correct angle? 3/52?
The fun starts now

impl
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Re: BMW V8 M62B44 - questions about ignition system

Post by impl » Tue Jan 15, 2019 9:15 pm

finally 2/52

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