<VV> RE: Re: turbo distrubutor

[Jim Burkhard]

Yep, I am familiar with this collaboration kit, but haven't bought it yet
since I still have a Megasquirt and a Wide Band kit to put together.  It's a
good idea and anything that gets you past the limitation of the stock turbo
distributor should be considered.

Jim Burkhard

> -----Original Message-----
> From: virtualvairs-admin@corvair.org 
> [mailto:virtualvairs-admin@corvair.org] On Behalf Of John
> Sent: Saturday, April 24, 2004 8:17 AM
> To: virtualvairs@corvair.org; burkhard@rochester.rr.com
> Subject: <VV> Re: turbo distrubutor
> 
> 
> You turbo guys need to solve the turbo distributor advance 
> problem with modern electonics.  You need "Megajolt Lite, 
> Jr"!  MJLJ uses a RPM x MAP (Manifold Pressure) table to 
> configure the ignition advance, commanding a Ford EDIS module 
> to adjust the ignition advance based on the engine's current 
> runtime condition.  You can configure the distributor curve 
> to anything you want.  Take a look at:
> 
> <http://picasso.org/mjlj/>
> 
> Cost less than $100 bucks if you use junk yard parts.  No 
> Ford jokes please!  Ford sparks are as good as GM sparks.
> 
> John
> 
> > From: "Jim Burkhard" <burkhard@rochester.rr.com>
> > To: <UltraMonzaWest@aol.com>, <VirtualVairs@corvair.org>
> > Date: Fri, 23 Apr 2004 21:23:55 -0400
> > Subject: <VV> turbo distrubutor
> > 
> > Bah!  You can't "eliminate" the need for vaccum advance 
> UNLESS you are 
> > doing ALL full-throttle driving. Mechanical advance only is 
> fine for a 
> > race car, but on anything that is driven anytime part throttle 
> > (including all streeted cars), you will be underadvanced and the 
> > throttle response & fuel economy will suck.  All spark 
> ignited engines 
> > need to increase the spark advance at part throttle loads. 
> There's no 
> > way around it. If you crank up the static or centrifal advance to 
> > (ahem) "compensate" for the lack of a vacuum advance, you 
> will then be 
> > over-advanced at full load (prone to knock and/or losing 
> torque from 
> > the optimal timing).
> > 
> > The fact that GM didn't have a V.A. on the turbo 
> distributors was only 
> > because they were trying to keep the whole deal simple and 
> having BOTH 
> > a pressure retard and vacuum advance would have made things more 
> > expensive. But one level of spark advance (reardless of 
> load!) at all 
> > engine speeds up to 4,000 rpm (or is it 4400, I forget...) 
> is no way 
> > to run an engine, though. No modern car dispenses with load-varied 
> > spark advance. Sure, it's all done electronically (no distributor), 
> > but the optimum spark advance ALWAYS varies a lot with load. No way 
> > around it whether a turbo engine or not...  To not do so means you 
> > lose part throttle torque (feels unresponsive and you have to go 
> > deeper into the throttle to make the car move) and also 
> fuel economy 
> > (on account of a drop in indicated thermal efficiency from the 
> > mistimed combustion).
> > 
> > Jim Burkhard
> > Air, Fuel, and that other one... Now what was it...?
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