Re: [DML] Legend Turbo question

["therealdmcvegas" <dmcvegas@xxxxxxx>]

I'm not an engineer on the Legend motor, so I have no idea what makes
it so special. However, when reading up on turbo charging, I came
across a small article talking about Fred Dellis, and some earlier
work he did with Porsches.

I won't bother going into the aspects of turbo charging, but basicly
Dellis seems to have found a really unique, and economical way to take
a regular turbo charger, and incorporate Variable geometry into it.
Sequencial chargers are expensive, and add to the weight of the car.
Traditional VGTs have a high failure rate because the vanes can coke
up too easily, and get stuck. Garret (I beleieve) now has a new
charger out that uses sliding vanes, rather than rotating. This way
they clean themselves automaticly.

Fred Dellis had a design called "Bias Control". How the feedback
system on the car works, I don't have any information on (it somehow
measures both exhaust pressure, and intank vacuum). But basicly, he
incorporated the wastegate as a functional part of the turbo, rather
than just being a safety device. From idle, the the wastegate is wide
open. This lets the exhaust gases flow out, with as litttle resistance
as possible, allowing the car to take off with quickly, with no lag.
Some of the exhaust gasses are routed thru turbine, and begin to spool
it up. As the turbine speeds up, the wastegate begins to close. Boost
is acheived in the same amount of time, but the lag is eliminated. I'm
pretty sure that this also has some sort of control over ingition as
well, and requires a few custom components such as manifolds, fuel
distributors, etc. From what I can tell, this was all a mechanical
based feedback system, rather than electronic. I've only run across
this artice once, and only a small mention of someone finding an old
924 with this system installed.

Like I say, I've no idea if this is the same system that was installed
on the DeLorean prototypes, but it is definetly a start, and the only
thing that I ever seen simular. Same case, Dellis was pretty quiet
about exactly how the Bias Control worked. I'll see if I can find the
website which featured the article. If not, I'm sure it's listed on
the InfoTrac database.

-Robert
vin 6585 "X"

--- In dmcnews@xxxxxxxxxxxxxxx, Marc Levy <malevy_nj@xxxx> wrote:
> His name was Fred Dellis.  
> 
> The Twin Turbo project was well along when DMC went
> out of business, taking Legend with them (DMC owed
> Legend lots of money).
> 
> As you could tell from Fred's talk, this was NOT a
> bolt on kit.  Many of the engine internals were
> replaced with custom parts.  To rebuild a DeLorean
> engine with standard parts is an expensive
> undertaking, now add in the cost of the custom parts,
> turbos, new intake, intercoolers, ect..  The cost
> would limit the number of customers to the point where
> it would not be profitable.
> 
> As far as recreating it "from the specs", I have found
> that Fred keeps this information very close and has
> been careful to limit what information becomes public.
>  Having also spoken to someone else who worked for
> Fred @ Legend Industries, they had the same
> reservations.  I am not exactly sure why 20 years
> later they are still protecting the "company secrets",
> but have to respect their wishes.
> 
> I am confident that someone could build a "Legend
> Copy" engine, but the cost would make it impractical. 
> With money, you can do just about anything.  But if
> you have that kind of money, just make me an offer and
> buy the real thing!
> 
> Why did you not ask this question @ the show?  There
> was plenty of opportunity to ask questions.
> 
> --- bluemax86 <massimot@xxxx> wrote:
> <SNIP>
> > The question is, why was it never offered as an
> > aftermarket kit if it
> > was so good and also after all that money and
> > research that went into
> > it. Could someone recreate one today from the
> > original specs?
> > 
> > Max
> > 
> 
> 
> 
> 	
> 		
> __________________________________
> Do you Yahoo!?
> New and Improved Yahoo! Mail - 100MB free storage!
> http://promotions.yahoo.com/new_mail




To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/dmcnews/

<*> To unsubscribe from this group, send an email to:
     dmcnews-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/