boost guage and zener diode questions...

[Ben Swann]

Which vehicle are we referring to?

 

Why do a Z/R mod when the chips are offered at reasonable price.

 

The Z/R mod will definitely skew the digital boost readout and not reflect
actual pressure.  Resistor will skew the readout to display less than actual.
Zener will clamp the output of the PT so the readout will max out to a
particular value regardless of peak.

 

Also  the digital readout is not necessarily accurate even in an un-modded
setup.  Each .1 bar is about 3 PSI and the readout can lag as boost changes.
It is for a ballpark measure only.

 

Ben

 

[Date: Tue, 11 Jul 2006 15:47:47 -0700 (PDT)

From: tmb <the_questionist at yahoo.com>

Subject: boost guage and zener diode questions...

To: quattro at audifans.com

Message-ID: <20060711224747.62076.qmail at web60315.mail.yahoo.com>

Content-Type: text/plain; charset=iso-8859-1

 

 

i ask cuz i finally got around to hooking up my aftermarket boost guage, and
the numbers

certainly are not jiving.

 

in fact, they're not even consistently not jiving.  sometimes the digital
guage will show

1.2BAR, and the new guage shows 3psi, while other times it may show 6psi.

 

weird.

 

oh yeah, zeners.  i'm not having much luck locating one.  i've got the 470Ohm
resistor, now

i need the 4.3V zener diode so i can do the robert myers ECU mod.  anyone?
i'm in canada, so

US locations probably won't help me too much.

 

maybe it's used in some cars somewhere?  something i can yank out of old an
ECU something?

 

lastly, when doing the resistor mod, is there a positive and negative to the
diodes that has to

be followed?  as in, does the positive side need to be soldered to the
motherboard, and the

negative to the daughterboard?  or vice versa?

 

thanks, everyone!!

 

jason

tmb]