[Diy_efi] This turbo assist stuff, suggestions

[Matt Porritt]

Until recently I've just taken a memory of better/worse from them.
The last couple of GTs I've done (both GT25s) I've actually recorded the
0,7,15psi vs RPM more for interest to potential customers as far lag goes
for these bigger units.

I think that the absence of a thrust plate in BB turbos accounts for the
increased response more than opposed to the actual implementation of the
bearings.

1 thing I know 100% is that BB turbos are A LOT SLOWER than PB cores when
there is no restrictor on the oil inlet ;)
-- 
Matt Porritt
RC Race Cars and Supplies
ICQ #22776813


On 1/1/03 6:17 PM efi student wrote

> Got data?  I can get all the anecdotal evidence I want from lots of
> testimonies, but I can get the same thing for Prolong or Slick 50.
> 
> If you think ball bearings have less friction than a properly oiled plain
> bearing, you're kidding yourself.  Plain bearings have some pretty
> significant advantages over ball bearings.  And you're right, I've never
> seen a plain bearing turbo spin for 40 seconds after losing oil pressure,
> but it really doesn't mean that it has lower friction in service.  There are
> lots of reasons why ball bearings are better for some things, but it's hard
> to believe that they improve spool.  As a for instance, ball bearings first
> showed up in turbos in the 30's.  What makes them new and better now?
> Ceramics?  The marketing guys are all over this, but the engineers don't
> support the marketing claims.  If you have proof positive (data, charts from
> data you have collected, etc,) I know a LOT of people who would be
> interested in seeing your results.


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