<VV> VirtualVairs Digest, Vol 182, Issue 21

[Hugo Miller]

That makes sense - I believe low ratio is about 1.82:1, & that's a heck 
of a step up to direct top. If you're really cunning, you could make it 
a semi-auto with manual gear selection, then lift off the throttle just 
before the upshift. Bt the obvious question, of course - is it worth it?
Or of course fit a supercharger in place of the turbo. They are not so 
sensitive to revs.


On 2020-03-15 12:37, Dan Timberlake via VirtualVairs wrote:
> FWIW Robert P. Benzinger had this to say to the Corsa National 
> Convention
> Seattle, Washington, July 26, 1975.
>
>
>
> We wanted rather desperately to match up a turbocharger with an
> automatic transmission. It has some pretty attractive aspects about
> it. But we just could never make it go. The thing that you run into -
> and maybe some of you have even experimented yourself with this
> combination - is that when you wind up the engine in low gear, get 
> the
> turbine wound up to full boost and then make the upshift, it suddenly
> pulls the engine RPM down with the boost still up where it belongs 
> for
> a couple of thousand RPM higher. With the low engine speed and the
> blower still wound up, it gets
> into combustion difficulties that makes wild detonation look pale.
> There was just nothing we could do to get the engine thru this rough
> spot. Once the malcombustion starts, you can't just shut it off 
> again.
> Perhaps the availability of a three speed automatic or maybe a four
> speed would have done it by getting the gear steps tighter. But with
> Powerglide being a two speed set up we could never find anyway around
> it.
>
> http://www.vv.corvair.org/Library/benzinger.htm
>
> ==================
>> Message: 1
>> Date: Fri, 06 Mar 2020 13:43:55 -0500
>> From: Hugo Miller <hugo at aruncoaches.co.uk>
>> To: <virtualvairs at corvair.org>
>> Subject: <VV> Turbo PG's?
>> Message-ID: <3c462aa719436dcf7bd341293f698739 at aruncoaches.co.uk>
>> Content-Type: text/plain; charset=UTF-8; format=flowed
>>
>> I gather that Spyder engines and Powerglides are not a good mix? I 
>> had
>> always understood that the torque output from the Turbo engine was
>> actually lower than the non-turbo at low revs. But I've just seen 
>> some
>> graphs which suggest the opposite?
>> I am on the point of rebuilding a 164 140 to go in my PG, but a good
>> Spyder engine has just come on the market, which would save me the 
>> job
>> of rebuilding the 140.
>> Any observations?
>>
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