Megaspark, KS and Re: turboing an 8v

[jdbubb at ix.netcom.com (Dan Bubb)]

Shawn:
I was talking with a friend last night. He had just fired up his 2.0 8V now
with ITB's and Megasquirt for the first time. That by itself was pretty
awesome! (He mimmiced the Porsche Cayenne turbo commercial with the phone by
the exhaust!)
Anyway we got to talking about using KS ignition. For an NA engine the
ignition curve is pretty optimum and it provides good protection from
pinging. But, like I said, for a turbo engine it doesn't respond under boost
by retarding the ignition. Then I got to thinking that all Megaspark (or
Megasquirtnspark) does is intercept the signal from the Hall sender, wait
the appropriate amount of time based on the programmed inputs, then send the
signal to the ignition module which fires the coil. In this instance the
Megaspark is programmed for the basic advance curve with advance or retard
overlaid on that based on manifold vacuum or pressure.
So, what if the Megaspark gets the Hall signal, then sends the output to the
KS ignition which then triggers the ignition module? In this case the
programmed values in Megaspark would be corrections to the ignition map in
the KS ignition! So, the basic advance curve would all be zeros (no
correction needed) and the vacuum advance would be zero (again relying on
the KS fuel map), but the pressure retard would be how much timing you want
to pull out. So, you just "correct" the KS curve to retard under boost AND
you still have protection of the knock sensor ignition! Right off hand I
think it will work.

Check here:
http://autos.groups.yahoo.com/group/megaspark/   and here:
http://autos.groups.yahoo.com/group/megasquirtnspark/
for more info on the Mega-derivatives.

What cha think?
Dan



----- Original Message -----
From: "shawn f" <falzsf@mts.net>
To: "Dan Bubb" <jdbubb@ix.netcom.com>
Cc: "scirocco list" <scirocco-l@scirocco.org>
Sent: Wednesday, October 22, 2003 5:54 PM
Subject: Re: turboing an 8v


> very interesting you just asked alot of questions, i have been trying to
> find out. Awesome. Ok i cant wait for ultr megasquirt, but would like to
get
> started. Howver i need to find some other parts so i guess i can wait for
a
> bit.......Not to familar with mega spark. I can use it without mega
squirt?
> So right now i could make it and threw it on my 1.8 CIS JH? I will have to
> look into this.....
>
> Shawn F
> ----- Original Message -----
> From: "Dan Bubb" <jdbubb@ix.netcom.com>
> To: "shawn f" <falzsf@mts.net>; "Dan Smith" <sad_rocc@yahoo.com>
> Cc: "scirocco list" <scirocco-l@scirocco.org>
> Sent: Wednesday, October 22, 2003 7:40 AM
> Subject: Re: turboing an 8v
>
>
> > Shawn:
> > Do NOT use a knock sensor ignition on a turbo! (OK, just my opinion)
> > Maybe in conjuction with some ignition module that retards timing under
> > boost, but not by itself.
> > The reason is, there is no retard under boost. So, as soon as your
engine
> > pings, and it will because there is no retard under boost,  the KS will
> pull
> > out alot of timing (too much) then slowly try to put it back in. Because
> it
> > pulls it out fast and puts it in slow (this is not sex here! Pay
> attention!)
> > the timing is too retarded for optimum power.
> > The KS ignition is a protection device, not a device to optimize timing.
> > There are several Megaquirt derivatives (or UltraMegasquirt coming in a
> few
> > months) that let you program your timing so it'll retard under boost.
I'm
> > installing Megaspark on my nephew's turbo Rocco in the next week or so
to
> > work with CIS. I'm sure at some point I'll post any data I get from
this.
> > Dan
> > Keep on dreaming! Even 4 psi is alot of fun!
> >
> > ----- Original Message -----
> > From: "shawn f" <falzsf@mts.net>
> > To: "Dan Smith" <sad_rocc@yahoo.com>
> > Cc: "scirocco list" <scirocco-l@scirocco.org>
> > Sent: Tuesday, October 21, 2003 9:45 PM
> > Subject: Re: turboing an 8v
> >
> >
> > > Well i plan on turboing my 8v. First a just rebuild my engine.
Actually
> i
> > am
> > > still putting i together. Than the next step is finding a knock sensor
> > > igntion. Then megasquirt than turbo. It will take some time no doubt.
> But
> > i
> > > can dream cant i?
> > > ----- Original Message -----
> > > From: "Dan Smith" <sad_rocc@yahoo.com>
> > > To: <scirocco-l@scirocco.org>
> > > Sent: Tuesday, October 21, 2003 4:24 PM
> > > Subject: turboing an 8v
> > >
> > >
> > > > I've always wanted a turbo car, enough so so I got that p.o.s. Saab
> > mainly
> > > because it had a turbo in it. But turbos always seem out of my league.
> > > However, I know a bunch of you have turbo'd 8v's and I was wondering
> just
> > > what is the cost. What parts can come from yards, what has to be
bought,
> > how
> > > hard is it to find yard parts and what kind of work does it take? I've
> > > looked at the 'kits' people have put together on vortex and they all
> seem
> > > $1000 or more. The more detailed you are the better. Like if you put:
4
> > > mandrel u bends, 2 18" pieces of aluminum pipe - $75 that would be way
> > > helpful. Even better, anyone have a tech writeup on it? Just give me
the
> > > low-down on what it takes to turbo an 8v.
> > > >
> > > > TIA,
> > > > Dan
> > > > Always researching
> > > >
> > > >
> > > > ---------------------------------
> > > > Do you Yahoo!?
> > > > The New Yahoo! Shopping - with improved product search
> > > > _______________________________________________
> > > > Scirocco-l mailing list
> > > > Scirocco-l@scirocco.org
> > > > http://neubayern.net/mailman/listinfo/scirocco-l
> > > >
> > >
> > >
> > >
> > > _______________________________________________
> > > Scirocco-l mailing list
> > > Scirocco-l@scirocco.org
> > > http://neubayern.net/mailman/listinfo/scirocco-l
> >
> >
> >
>
>
>
> _______________________________________________
> Scirocco-l mailing list
> Scirocco-l@scirocco.org
> http://neubayern.net/mailman/listinfo/scirocco-l