> > As for the ignition, it is doing fine, now that I
figured
> out
> > what was
> > causing my misfiring condition at high rpm (6500 &
up).
> >
> > snips.......................
> >
> > Other than that, it flies great!
> >
> > Mark S.
> >
> > snips....
> >
> >
> > Mark,
> >
> > Sorry, I must have missed the info on your ignition
> problem. What
> > was the cause and solution to your high speed missing
> condition.
> >
> > thanks, Joel
> >
> >
> >
> > Joel,
> > A little history on my ignition problem. Originally, it was
> using the
> > old style CAS, the one that resembles a distributor. I
had the
> idea of
> > changing over to the new Renesis style (fewer moving
parts, 2 lbs
> > lighter). So, I purchased the necessary parts and did the
> conversion.
> > I had to send the EC-2 back for upgrades anyway, so it
seemed like
> a
> > good time to have Tracy change it over. The mods included the
> snubber
> > upgrade to solve the injector dribble problem.
> >
> > Well, when I got it back, it ran beautifully in the lower rpm
> range, but
> > wouldn't run in the upper ranges. We ended up installing
a zener
> diode
> > circuit and played around with resistor values until we got it
> running
> > much better. This is what another Renesis builder did and it
> fixed his
> > problem. Anyway, I thought we had it handled, until I started
> doing
> > fast taxis and I got into the 7000+ rpm range. The
misfire was
> back.
> > Many phone calls to Tracy, and after trying many, many things,
> none of
> > which helped, I was ready to change it back to the old CAS.
> >
> > The last thing on my list of things to try was the CAS
> bracket. Why the
> > bracket? Well, I remembered reading in the Renesis manual
on CAS
> > information and they mentioned to beware of metal
filings/powder
> on the
> > CAS. I got to thinking that if it was that sensitive,
maybe my
> 4130
> > bracket might be causing the problem. So, I fabbed up a
bracket
> out of
> > aluminum and tried it. Would you believe it, that was the
> problem. It
> > runs great now and I couldn't be happier. So, if you
decide to
> convert
> > to the Reneisis CAS, make the bracket out of aluminum, not
steel.
> >
> > So, now you know "the rest of the story".
> >
> > snips... info later
> >
> > Thanks,
> > Mark
> >
> > Thanks Mark on the CAS steel bracket bit. Amazing. Who
would have
> thunk?
> > :)
> >
> > Paul Lamar ...No rotor no motor.
>
> Mark I am suffering a similar problem. No ignition on an RX8 with
> the the
> standard CAS and RWS system. Would you please explain in laymens
> terms about
> the Zenior diode and resistor, actual values and a diagram would
> help. What
> is the internal resistance of your CAS? What is the output
voltage
> of your
> CAS at cranking speed? As you know my CAS bracket is aluminum of
> course, it
> came with the engine. No filings on the CAS sensor, cranking
voltage
> not
> less than 12V, battery ground lead does not pass even close
to the
> CAS, etc.
> Who was the other Renises builder and his e-mail address please?
> Thanks, Milo
>
> Where do you live Milo? Perhaps we can find somebody with a
scope to
> help you
> out.
>
> Paul Lamar
>
>
>
> Milo,
> According to Tracy, the zener circuit is now built into the EC-2,
so I
> doubt that is the problem. Besides, it only addressed the issue of
> overdriving the trigger circuit at higher rpm. Have you checked your
> wiring to make sure that everything is wired correctly? Have you
> verified that the CAS is not wired backwards (I made that mistake
> initially). Have you checked the CAS signal with a oscilloscope (you
> may have a bad CAS)? Have you verified that the CAS connector is
making
> connection with the CAS pins? What is your gap between the trigger
> wheel and the CAS? The gap on my CAS is .020". Too big a gap will
> prevent it from starting (don't ask). Do you have 12v to the coils?
> Have you tested the injectors and coils in the simulation
mode? Are all
> of the ground leads connected to the EC-2 and to ground (Yes, I made
> that mistake once too)? Is the d-sub connector making good
> connection... any bent pins? Do you have fuel pressure to the
> injectors? Finally, have you spoken with Tracy (he's back from
> Colorado)? I would make a list, verify everything on the list,
then if
> it still doesn't start, call Tracy.
>
> There has to be a reason why it won't start. You just need to
find the
> needle in the haystack.
>
> Mark S.
Mark,
It would appear to be wired correctly.
Tracy said even if the CAS was wired backwords
it would still fire. It appears to be wired correctly.
Have not checked the CAS with a scope. The CAS
has 105 ohm resistance, what is the resistance of you CAS?
Have not verified the CAS pins.
Trigger gap is .032.
A full 12v is available at the coils.
The injectors and ignition check bright in simulation mode.
As best as I can tell all grounds are at the same level.
Have not checked the d-sub connector.
Fuel pressure is to the injectors.
Will continue with your suggestions, thanks a million.
Milo
Milo,
Sorry, but I can't check the resistance of my CAS as it is hard wired
into the harness and then potted. I didn't want the big fan in front to
stop turning because a connector came off. However, I do have a friend
that has one that he can check the resistance. I'll ask him next time
we talk. That should be this weekend.
BTW, the Renesis CAS is also used on the Mazda Protoge. The Protoge has
two engine options, and the CAS's are different on each. Sorry, I don't
remember which engine matches with the Renesis' CAS. I mention this
because you may want to check the wrecking yards for an
inexpensive spare to plug in and try.
If you have access to an oscilloscope you can easily verify if the
CAS is putting out a good signal. This would be a sure-fire way
to verify the CAS.
Thanks,
Mark
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