best aftermarket boost gauge

Taka Mizutani t44tqtro at
Wed Sep 17 16:43:54 PDT 2008

There is no overboost function in a 3B ECU, you need an AAN, ADU or similar
ECU for that function.

I think you're correct in the 21.5psi (gauge reading, not absolute).

Since your subject line asks for the best boost gauge, I'd submit that the
Defi BF series are the best, with STRI, Omori, Greddy and the like as close

Most of the gauges that are electric rather than mechanical, that use a
stepper motor system are very accurate and reliable. The nice thing about
most of these is that there are also peak warning, hold and replay functions
that can be useful for diagnostic purposes.


On Wed, Sep 17, 2008 at 4:31 PM, robert weinberg <centaurus3200 at>wrote:

> i'm ready to install a decent boost gauge in my car being the digital one
> is dead. and being it's not all that reliable and only reads to 2 bar - it
> makes for sense to install a good aftermarket one.
> i was thinking the autometer 3303. it reads up to 30 psi. i'm running an
> IA3+. i think it's 2.5 bar - but you deduct 1 bar (14.5 psi) for
> atmostphereic pressure - being it's NOT manifold (boost)  presure. so, the
> IA3+ is 21.5 psi, correct?
> so, will a 30 psi boost gauge be fine or will the boost gauge also read
> atmospheric pressure on top of the manifold pressure?
> what i want is to accurately read manifold pressure and have "more gauge"
> available to keep an eye on overboost.
> lastly, some say the IA3+ overboosts to 3 bar (29 psi manifold pressure) -
> but i've also read it reduces boost at redline to save the turbo.
> thanks,
> Robby
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