Depends what voltage
it's??
nominal at.
Look at the Miata link, it shows actual GM dwell settings
from their ECU.
You'll see RPM vs
voltage for the dwell settings. I don't know how Tracy's
computer handles the dwell.
- Matt Boiteau
On 2019-07-08
7:17:34 PM, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net>
wrote:
So which
MS document do we take as being the good oil for the LS2
coils. Is it 4.0mS or 3.5mS ?
Steve Izett
> On 9 Jul 2019, at 6:04 am, Matt Boiteau
mattboiteau@gmail.com
wrote:
>
> That's an outdated page. I'm not sure why they even
keep them alive.
> http://www.msextra.com/doc/pdf/MS3baseV30_Hardware-1.4.pdf
> Page 93
>
> Of course that number depends what voltage is
consider at "nominal". Not sure if Tracy's changes value
based on voltage or not. And RPM vs Manifold pressure
>
>
https://www.miataturbo.net/diy-turbo-discussion-14/lsx-coil-thread-82744/page8/#post1380088
>
>
>
> - Matt Boiteau
>> On 2019-07-08 11:58:11 AM, Bobby J. Hughes bhughes@qnsi.net
wrote:
>>
>> Matt,
>>
>>
>>
>> How did you end up with 3.5ms for the
D585???s? At least one Megasquirt resource shows 4.0ms
at 14VDC. My concern is the wide range between
Tracy???s LS1 4.3ms and the 3.5ms referenced. If the
megasqiurt information is correct then Tracy was very
conservative with the LS1 settings. 4.0ms vs 5.6ms.
>>
>>
>>
>>
>>
>> http://www.megamanual.com/seq/coils.htm
>>
>>
>>
>> Bobby
>>
>>
>>
>> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
>> Sent: Friday, July 05, 2019 8:03 PM
>> To: Rotary motors in aircraft
>> Subject: [FlyRotary] Re: timing on renesis
engines
>>
>>
>>
>> For the LS2 - D585 truck coils, 3.5ms is the
recommended dwell.
>>
>>
>>
>>
>> - Matt Boiteau
>>
>> On 2019-07-05 7:37:10 PM, Stephen Izett stephen.izett@gmail.com
wrote:
>>
>> Thanks Bobby and Lyn.
>>
>> According to Tracy???s code - 2.6 mSec RX8,
3.5 mSec RX7, 4.0 mSec LS2, 4.3 mSec LS1.
>> I also wondered about the timing difference
between the various coils trigger circuit actually
firing.
>> Now I suppose that difference might be a
few uSec and insignificant, but if its 100uSec
>> then the timing difference between various
coil types might become significant.
>>
>> @ 7000 RPM
>> 1 rev takes 8.6mSec
>> So each degree of EShaft rotation is
24uSec.
>>
>> Thanks again for the help.
>>
>> Steve
>>
>>
>>
>>
>>
>>
>>
>> > On 6 Jul 2019, at 2:52 am, Bobby J.
Hughes bhughes@qnsi.net wrote:
>> >
>> > Lynn,
>> >
>> > Default is what ever Tracy set it to.
The CAS location is not adjustable so default is set
in his code.
>> >
>> > Bobby
>> >
>> > Sent from my iPhone
>> >
>> > On Jul 5, 2019, at 12:43 PM, lehanover
lehanover@aol.com
wrote:
>> >
>> >> What is the "Default" advance? Is
that checked with a timing light? Easy starting can
be up to 15 degrees of advance. For full power use
up to 27 degrees of advance is good up to 10,500
RPM. Boosted engines require less advance as boost
increases. Because the effective compression ratio
as well as charge temperature is going up. Very high
boost my have advance closer to zero. Advance is
used to allow full combustion
>> >> of the charge before the exhaust
port opens. At higher pressure and temps the flame
front speeds are increasing. So, less time is
needed. Thus less advance is needed. Lowering intake
air temps with an inter-cooler and adding water
spray can allow higher boost.
>> >>
>> >> Boosting to maintain sea level
performance would probably not shorten engine life.
Boosting for additional performance does shorten
engine life. The kids get over 600 HP with boosted
drag racing engines. This is fine if you only need
the engine for 9 seconds. You have to know what the
actual advance is to make any decision. Mark the
flex plate or flywheel teeth with paint so you can
check actual advance during any RPM.
>> >>
>> >>
>> >> It is difficult to detonate an NA
engine. It is not difficult detonate a boosted
engine.
>> >>
>> >> Lynn E. Hanover
>> >>
>> >>
>> >> In a message dated 7/5/2019
10:22:44 AM Eastern Standard Time, flyrotary@lancaironline.net
writes:
>> >>
>> >> Steve,
>> >> I???m running default timing or
maybe 1 degree advanced. Early on I experimented
with 1-2 degrees advance for many flight hours and
did not detect any noticeable change in engine
performance. I did push the engine to what I believe
was detonation during a ground tuning session. I was
tuning under boost (44??? MP) , 7000 rpm with a
wideband O2 on each runner and adjusting Mode 9 and
Mode 4. With F/A balanced between each rotor and
EGT???s under 1600F I was trying to see if
increasing timing would lower EGT???s. F/A was in
the 11???s. This was at the end of the session and
the engine and supercharger were already hot. I
think I had added 4-5 degrees advance with no
noticeable EGT decrease when I encountered a mild
bang or misfire. This condition was well above my
38??? MP limit I sometimes use for takeoff.
>> >>
>> >> I???m curious about the dwell time
setting difference between LS1 and LS2 coils. I
switched to LS2 coils sometime back with no failures
to date. I remember seeing an option setting in some
of the code you or Finn posted. Internet research
indicates LS2 coils require less dwell time than
LS1. Possibly 0.5-1 ms less.
>> >>
>> >> Bobby
>> >>
>> >> Sent from my iPad
>> >>
>> >> > On Jul 5, 2019, at 12:58 AM,
Stephen Izett stephen.izett@gmail.com
wrote:
>> >> >
>> >> > Hi there Guys
>> >> >
>> >> > Of the guys with Renesis
engines using EC2/3 can you comment on your timing
settings.
>> >> > I???ve to date left the
timing at the default setting figuring its set by
the location of the CAS.
>> >> > Not sure if the various coil
options have different trigger timing latency.
>> >> >
>> >> > Thanks
>> >> >
>> >> > Steve Izett
>> >> >
>> >> >
>> >> >
>> >> >
>> >> > --
>> >> > Homepage: http://www.flyrotary.com/
>> >> > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
>> >>
>> >> --
>> >> Homepage: http://www.flyrotary.com/
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>>
>>
>> --
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