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 That's an outdated page.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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