Re: Callaway Turbo Kit

["Gary G. Erickson" <erickson@teleport.com>]

Linus Toy wrote:

> hmmm...let's compare.  the 4kcsq is 8.5:1 CR, 2.2L I5.  the somewhat
> pedestrian B230FT (2.3L I4 SOHC turbo) in my wife's Volvo 940 wagon has an
> 8.7:1 CR.  This is NOT a sophistocated turbo folks--yes, it has

OK, but you _did_ say that there is a knock sensor involved, and as I
recall, moving to the LH-Jetronic means pulsed fuel delivery rather than
CIS, which (Disclaimer!!) I've been _told_ is better suited to fueling a
forced induction engine.

> LH-Jetronic, and a knock-sensor ignition (basically a bolt-on--NOT
> integrated with FI computer).  But--wastegate control is simply an analog
> signal (compressor boost) to the wastegate actuator--that's right folks, NO
> COMPUTER CONTROL OF THE WASTEGATE!  For this, you get 162 hp at 4800 rpm
> and 195 ft-lb torque at 3450 rpm.  (Earlier versions of this same engine
> used K-Jetronic, with much the same boost control systems).

And you could expand on this system a bit (or introduce it to a
home-brew) by incorporating the APC system that Saab used in their
mid-80's turbos (this system was discussed on the Q-list back in
October; more info can be found at
http://www.teleport.com/~bertram/volvoapc/ )  This system utilized a
knock sensor and WG freq valve to monitor for detonation and pulls the
boost down if pinging is detected.

> true...just thought i'd offer some more food for thought--I'd guess a
> home-brew turbo conversion on the stock 4kcsq engine is doable for the
> slightly ambitious.

But considering the amount of R&D and potentially costly testing work,
why would you want to?  There's an awful lot of custom plumbing
involved, and I think the effort involved would pretty quickly overrun
whatever it would take to install a full MC engine and computer.

We know somebody whose done it, but even he's admitted that it has it's
problems.  The big one being the control of detonation under boost
conditions.

I'm not saying it can't be done, but I am saying that I'm too chicken to
undertake myself.  I would love to be able to have done it (and I _have_
thought about it) and tell people that you just need "this thing, that
thing, and the other" and how to bolt them on.  But when MC engines are
reasonably available, and not overly expensive, I'd have to say I would
take the factory approach to this one.

My $0.02 corrected for inflation and tax season,

Gary

-- 
Gary G. Erickson         Secretary -- NW Quattro Club
 503-702-5789           mailto:erickson@teleport.com
   http://www.teleport.com/~erickson/pnwaudi.htm