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Topic: Engine cuts out on clutch (Read 5921 times) |
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Mike H
Senior Member
Renault Clio
  
Posts: 2594
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Re: Engine cuts out on clutch
« Reply #20 on: Aug 18th, 2011, 1:23pm » |
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This topic made me go and Google search for "frequency sensitive switches" 
Where does the RPM switch get its input signal from? And how many pulses per minute @ 3,000 rpm?
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Mike H
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Dave2302
Senior Member
2006 Mercedes S55 AMG, Retired Barefoot Waterskier
Posts: 1119
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Re: Engine cuts out on clutch
« Reply #21 on: Aug 19th, 2011, 7:14am » |
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RPM is sensed by the Crank Position Sensor on the front pulley, one missing tooth gives the raw signal, so @ 3000rpm = 3000 pulses to ECU 
However, the MSD RPM Window Switch takes its input from EDIS coil pack, so @ 3000rpm = 1000 pulses on wasted spark like EDIS
It is programmable for different ignition systems
Cheers Dave
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Dave "The 'ol Bear" ex Footer !
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Engine cuts out on clutch
« Reply #22 on: Aug 19th, 2011, 1:53pm » |
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Fairy nuff! I was just idly thinking about doing a LTspice simulation for an analogue version, see if it can be made to work
NB: 1,000 r.p.m. corresponds to 16.66 cycles (pulses) per second. The pulse time will be very short as well won't it? I'm guessing
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Mike H
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Dave2302
Senior Member
2006 Mercedes S55 AMG, Retired Barefoot Waterskier
Posts: 1119
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Re: Engine cuts out on clutch
« Reply #23 on: Aug 20th, 2011, 1:02pm » |
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on Aug 19th, 2011, 1:53pm, Mike H wrote:
NB: 1,000 r.p.m. corresponds to 16.66 cycles (pulses) per second. The pulse time will be very short as well won't it? I'm guessing
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Hi Mike,
I'm not "brain fresh" atm, been working ghosters lol, but.................
If we is talking EDIS here, on a 6 cylinder, at 1000 rpm, one pair of coils will fire 333.3 rec times per minute, divided by 60 (seconds) = 5.55 pulses per second, so at 3000 rpm = 16.6 rec pulses per second, I guess that is what you are saying .................
I think the pulses wll be m/sec and depend on the "collapse" time of the EDIS ignition coil pack
Having found the MSD unit very user friendly, so although emulation can be done, I think I'd stick to buying the unit.
Also you can adjust the exact VIS opening and closing point, I beleive as standard it is exactly 3000 rpm, but we have found better results setting it to open at 3250 rpm, this seems to eliminate that slight flat spot the BOB has at 3000 rpm
Cheers Dave
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Dave "The 'ol Bear" ex Footer !
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Engine cuts out on clutch
« Reply #24 on: Aug 21st, 2011, 6:12pm » |
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on Aug 20th, 2011, 1:02pm, Dave2302 wrote:
I think the pulses wll be m/sec and depend on the "collapse" time of the EDIS ignition coil pack
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Yes problee a couple of milliseconds then
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Mike H
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