NS Dev
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| posted on 14/4/11 at 08:48 AM |
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running coil on plugs in "wasted spark mode"
Using another trusty old MBE 956 ecu on a vauxhall XE, would like to use coil on plugs for neatness, can I just fire them in pairs off the wasted
spark setup, using the internal amps in the ecu? My concern is overloading the amps, but I don't know if two small pencil coils will be any more
demanding than 1 bigger coil in the normal coil pack......any ideas?
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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lsdweb
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| posted on 14/4/11 at 09:15 AM |
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Are the coils designed to run as wasted spark? i.e. are they able to 'recover' quickly as they may be firing twice as often as
'normal'.
I ask because we always had suspicions that my coils on the R1 were struggling at high revs as I was running wasted spark off the Emerlad ECU - in the
end I sent the ECU off to Emerald for an upgrade. That was over two years ago and I've not had it back yet....!
Wyn
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NS Dev
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| posted on 14/4/11 at 09:23 AM |
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hmmmm, I suspect that I may be opening a coil shaped can of worms!!
Am waiting to spk to Steve Broughton as apparently he's done one like this on an XE, but one of the other guys at SBD said that is does depend
on the type of stick coil used!
I will only be using 8000rpm though
[Edited on 14/4/11 by NS Dev]
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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lsdweb
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| posted on 14/4/11 at 09:33 AM |
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I'm no expert! But it is something I'd be concerned about and a really tricky one to deal with - my coils were getting really hot - I
never had trouble on the track but on the rollers it may have been a problem....
quote:
I will only be using 8000rpm though
Only :-) I guess if the coils are only designed for sequential, then firing them twice as often at 8000 rpm may not be good!
Steve Broughton is your man!
Regards
Wyn
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britishtrident
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| posted on 14/4/11 at 09:39 AM |
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You can get plug top coils that fire 2 cylinders ---- the 2nd cylinder connected via a short plug lead, not as neat as 1 coil per cylinder.
Or you could use 2 double ended coils as used on a lot of motor cycles and the Rover MG TF VVC which had them mounted on the bellhousing end of the
cylinder head.
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britishtrident
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| posted on 14/4/11 at 09:42 AM |
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See ebay Item number: 180640698781
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― From BBC TV/Amazon's Ripper Street.
[/I]
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matt_gsxr
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| posted on 14/4/11 at 11:37 AM |
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why not use COP from a bike engine that revs to 16000rpm, at 8kRPM it won't know any different (some R1 rev to 13750 from memory, which
isn't far off).
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zilspeed
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| posted on 14/4/11 at 11:41 AM |
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quote:
Originally posted by lsdweb
Are the coils designed to run as wasted spark? i.e. are they able to 'recover' quickly as they may be firing twice as often as
'normal'.
Wyn
That's something I read about very recently.
The recovery time of the COP is incompatible with wasted spark due to the very nature of it firing twice as much as is actually required.
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