Twin charger project?

[mr.utility at highstream.net (David Utley)]

If memory serves, Turbo magazine did an MR2, the late body, with add-on  SC 
and Turbo, you might see if you could source that to get some more ideas...

Also, a programmable FI will make your life a lot easier, in my opinion...  I 
have no idea what kind of a tab you are expecting to run up on this project, 
but I myself will eventually get the megasquirt kit for the G60 I will be 
turboing later on.  It may be a headache at first, wiring the thing up, 
trouble shooing, etc., but when you get the thing to run, I think you will 
have a much greater likelihood to not detonate with that type of setup...  A 
wideband 02 also seems very necessary, as well as a device to monitor your 
mixture...

If I were you, I would also read Corky Bell's two books, Turbo, and 
Supercharged, or whatever they are...  I am sure that there will be all sorts 
of info that is duplicated, but the bits that are not.....  Vewy, vewy 
impotent...  :-)

HTH
-- 
Regards,
David Utley
-----------
Cable Volkswagen
405-470-3129
1-800-522-6793


Quoting Cory Langford <corylang@dccnet.com>:

> 
> 
> Okay,  
> 
> This is a currently a theoretical question for those who have been dabbling
> in the boosted engine area.  I know there are more than a few of you out
> there :)
> 
> I have a wild idea for my next project.
> 
> I have sitting in my garage right now a mk1 roc with a g60 conversion that
> I am finishing cleaning up the install and correcting some of the issues
> from previous owners.  I have a mk2 turbo 8V and a spare 8V engine already
> turbo'd (it was going to be the engine I transplanted into the mk1 body I
> found, but I lucked out and found one with a g60 already installed)
> 
> So, the wild idea came to me last night:  Why not a twin charged roc.
> 
> Take the supercharged g60 engine and ADD a turbo system to it (instead of
> replace the charger with a turbo as most people do).
> 
> I know for a fact that the early supercharged MR2's had a turbo kit that
> supplemented their charger turning them into a twin charged car.
> 
> I figure engine management should not be that much different as boost is
> boost as far as an engine is concerned.  
> 
> What do you think?
> 
> My first real thoughts on this is which way to route the boost.  Do you go
> turbo first and from the turbo to the Super Charger and then to the intake
> (inter coolers in there somewhere of course)
> 
> Or do you go Super Charger then turbo then intake?
> 
> First intake is Super Charger in front of turbo, as the SC is directly
> connected to the engine, where as the turbo is basically free wheeling.  If
> the charger pressure at the intake is greater than the turbines are
> spinning I figure you just get a backwards effect on the turbo (the intake
> spins the exhaust side faster and sucks out the exhaust gasses) until the
> turbo spools up and supplies more boost.
> 
> If it was the otherway around I figure the SC would get boost pressure and
> need to squeeze it through the G60 and that would cause allot of stress as
> it is only able to spin at the rate based on the crank connection.
> 
> Like I said.  Just musing, but any opinions would make research a little
> more fun :)
> 
> 
> Cory Langford
> '79 Cheap Ass turbo daily driver - RIP
> '86 turbo project - The Next daily driver?
> '65 Ghia - The next project in the garage
> 
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