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[turbobike] ZX-11 turbocharged! - bigger turbo?

Dave Morrill (david.p.morrill@fairchildsemi.com)
Wed, 14 Apr 1999 13:45:49 -0400

Hello Diego,
    Sounds like a good project.   I'm not sure, but I think that your GPz 750
turbo may be a little small.  If it is, you will probably be disappointed.
When swapping out a turbo from salvage and I can't get the compressor map, I
usually do a rough cfm calc based on boost, disp, and redline from both engines
and see if they are close.  If the turbo is too small you'll be way off on the
efficiency and have problems with surging, and probably detonation from the
extra air heating, and just plain poor performance.

I don't know the specs on your bike, if you send them to me I'll calculate the
numbers for you.  Need displacement, boost that your GPz ran, and redline on
both bikes.

You may be better off finding a junkyard turbo from a 1.5-2.0 liter car, clean
it up and try that.  I've gotten them in good shape for under $100.

Good luck!


Astorga, Diego Marcelo wrote:

> Hi again!!!!:
> Hi Bill, as you say, I'm not lookin' for an astronomical boost and an
> astronomical waste of money for my pockets, understand?, currently I have
> not got this number ($3000-$4000)... I'm lookin' for experience in this kind
> of works, Do ya know what I mean?...
> It's not a matter if I can not gain 200-250...500 HP in the rear wheel...To
> begin, 150 HP or lil' less, it's Ok for me, The biggest satisfaction for me
> will be plain, do, and ride my project. With the shortest investment of
> money... recyclin' what I've got..., Understand?
> Well, I hope you can understand my english...and understand what I wanna
> do... and to finish my 1st. big project in this kind of work, I will need
> all the help that everyone of you can give me.
> I think that's all....
> Read ya later, Dudes...
> Diego!
> > -----Original Message-----
> > From: Bill Charette [SMTP:five0@skypoint.com]
> > Sent: Tuesday, April 13, 1999 1:36 AM
> > To:   Astorga, Diego Marcelo
> > Cc:   'turbobike@natvideo.com'
> > Subject:      Re: [turbobike] ZX-11 turbocharged!
> >
> > Diego.
> >
> > I think everyone on the list will tell you to save yourself the hassle and
> > just get a Mr Turbo kit.  They come engineered with everything you need to
> > get it running right, as long as you're not looking for astronomical
> > levels of boost.  Figure $3000-4000 american.
> >
> > -------------------------------------------------------------------------
> >
> > Bill Charette
> > Five0@skypoint.com | http://www.skypoint.com/~five0             DoD:#1915
> > 1985 Yamaha FJ1100                                               NRA:Life
> > Newton's 17th law of Life in America:  For every action there is an
> > unequal and moronic overreaction. --R&T, 4/98
> > -------------------------------------------------------------------------
> >