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

Edwards, Dave Dave_Edwards at iOra.com
Tue Jul 23 10:03:26 EDT 2002

1) I don't wear sunglasses (we don't get any sun in the UK :-( ) so it's not
a problem for me.
2) Nor have I as I wanted to experiment with positions before permanently
fixing it. I think I'll put it right in the mid position, i.e. in line with
the steering column. Where have you put yours?
3) No, the boost measurement is kg per cm2 which is 1.02 times bar, so it's
pretty close. The vacuum measurement is in another scale (mmHg I think), but
who cares!

I'll be honest that the boost gauge is mostly novelty for me. When I had my
WRX I found a boost gauge essential so that while I was waiting for a break
in the traffic to overtake, I could hold the car on partial boost to avoid
lag. However our S4 doesn't suffer from much lag so it's not much of an
issue (however it is the the RS4!). Nevertheless I still consider the boost
gauge invaluable for checking the engine is OK - if there's a leak or other
boost problem then I'll be able to see almost instantly.

No, my real need is the TT. My friends and colleagues had been ridiculing me
for sitting in my car for a few minutes with the engine running at the end
of a journey. Now I don't even get "why have you walked away from your car
with the engine running?" ;-)

-----Original Message-----
From: Philip Pace [mailto:pjpace at yahoo.com]
Sent: 22 July 2002 20:43
To: Edwards, Dave
Subject: Re: [BiturboS4] Defi Heads-Up display boost gauge and TT

Cool. I have the boost gauge part done, and am waiting till I have a while
to work on the turbo timer. A couple of comments: I can't see the display
with my polarized sun glasses, can you (if you have polarized lenses). I
haven't put on the sticky reflective thing, so I'm hoping that does it (but
I'm doubtful). 2. It's not bar it's measuring, it's something else that is
less than bar. FYI. Thanks for posting these additional tips - I really need
that TT part done.
     -Phil P.

--- "Edwards, Dave" <Dave_Edwards at iOra.com> wrote:
> Installed mine at the weekend. Many thanks to Keman (who used to post
> here), 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 the 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 the 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
> 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
> 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!
> Cheers,
> Dave

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