[BiturboS4] Defi Heads-Up display boost gauge and TT

Walter J Green Jr vr6pilot at hotmail.com
Tue Jul 23 09:38:46 EDT 2002

nice informative post. thanks.

I have had a mech boost gauge (Omori), for about 10 months now. still not
installed.  <sigh>


>From: "Edwards, Dave" <Dave_Edwards at iOra.com>
>To: "'biturbos4 at audifans.com'" <biturbos4 at audifans.com>
>Subject: [BiturboS4] Defi Heads-Up display boost gauge and TT
>Date: Mon, 22 Jul 2002 17:46:24 +0100
>Installed mine at the weekend. Many thanks to Keman (who used to post
>the articles on AudiWorld and the info on MachV's site. Most of all Keman
>since he did the R&D work for controlling the coolant afterrun pump from
>TT. For those who don't know it means that my TT does NOT keep the engine
>running, instead it keeps the coolant flowing through the turbos and keeps
>the radiator fan going for the controlled time after I switch off.
>To be honest I wasn't too bothered about having a HUD boost gauge: I wanted
>a boost gauge and a turbo timer so it made sense to use a combined unit. I
>only know of one other combined type (the Blitz), but of course I'd have
>difficulty of deciding where to mount the display. The Defi HUD is so
>simple: Just stick the box on the top of the dash and it's reflected in the
>windscreen. It's also great that it has both a digital and analogue
>If anyone wants to do Keman's install then I have several tips:
>1) You only need two relays if one has a change-over contact.
>2) You can access all the wiring you need from the terminals under the dash
>and the wiring at the back of the fuse-box. There is no need to hack into
>steering column wiring as others (including Keman) have written. The wiring
>at the back of the fuse box is much more accessible.
>3) The only tricky part is splicing into the wires to the coolant
>temperature sensor. Don't bother as it's too tricky mainly because the
>are quite solder-resistant. After failing to do this I ended up cutting the
>wires and patching in a new set.
>I had a quick test of the boost gauge and got 1.26 bar peak reading. The
>turbos are working great then!
>BiturboS4 mailing list
>BiturboS4 at audifans.com

'01 S4

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