max psi for 20vt?

Justin Olson project20vt at
Tue May 21 23:42:24 EDT 2002

--- Ken <auditude at> wrote:
> Hello 20vt-er's,
> What is the max boost people are running on their
> 20vt's?  Including those nuts in Sweden. :-)

Dahlback is running upwards of 35+ psi threw that
900hp monster. For a street car this is very
unrealalistic. On pump gas 21+ is pushing it w/ our
stock compression ratio. If you lowered the
compression down to 8.5:1 you could get away with
more. If you want to get a good turbo kit, Matrix
Engineering (, is developing
a kit for the 3b and AAn. It will have custom GIAC
software to make big power. It will use a very nice
manifold and a big Garrett turbo. Hp goal on pump gas
is over 350.

> I'm buying a boost gauge, and have to choose between
> a 20psi or a 30psi range.  While I don't imagine
> I'll ever be running 30psi, but possibly more than
> 20psi.  This would be for a 20vt with a big turbo
> and all the fixin's, potentially.
> Eventually, I plan to use programmable fuel
> injection with speed density type fueling, so I
> don't have to worry about MAF's or on-board 3B
> pressure transducers.
> For purposes of the question, imagine a SQ EM,
> K26/T-04E, RS2 cam, big injectors and FPR, and a
> nice single pass IC.  Say 9.0-9.3:1 compression
> ratio, unless a lower c/r makes sense.  (does it?)
> As for the question, "Why not just get the 30psi one
> if you're not sure?"
> It has a less desirable (to me) appearance
> (Autometer) than the 20psi one, so I don't want to
> get it if I won't use the extra range.
> I want to decide so I can add to an order from
>, and they charge for
> shipping on a "per order" basis.
> Thanks,
> Ken
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