[s-cars] DIY Boost control

Fri Sep 19 09:25:09 EDT 2003

It seems to me that a relief valve would solve the over pressure problem.

As for wastegate creep, I would look to software.
I build to about 25 PSI then it tapers down to 22 or so.
I can change that by winding in the WG spring, as right now my is almost all
the way out.
I thing my setting is about 2 1/2 turns in from when the bolt touches the
spring seat.

IMHO a relief valve is to harsh of a operator. With the SW operating the WG
properly it will allow some decent overboost while still protecting the
engine. Remember, it's not JUST boost we have to worry about. If the turbo
winds itself in to the wrong efficiency area, then you can also expect LOTS
of heat. And that is just about as bad as lots of overboost.

YMMV and only IMHO...

Mark S
----- Original Message -----
From: "Calvin & Diana Craig" <calvinlc at earthlink.net>
To: "Mark Strangways" <strangconst at rogers.com>; "Vincent Frégeac"
<vfregeac at sympatico.ca>; "'Aaron'" <aaront at cox-internet.com>; "'Audi -
Scars'" <s-car-list at audifans.com>
Sent: Friday, September 19, 2003 1:53 AM
Subject: RE: [s-cars] DIY Boost control

> Couldn't you just simply use the pressure relief half of this to help with
> wastegate creep, which to me, seems like all this guy was really getting
out
> of his experiment by looking at the acceleration.  This would still
maintain
> all the safety features of the electronic control but act more like an
> "ideal" spring.  I don't think the computer would even know.
> --Calvin
>
>
> -----Original Message-----
> From: s-car-list-admin at audifans.com
> [mailto:s-car-list-admin at audifans.com]On Behalf Of Mark Strangways
> Sent: Monday, September 08, 2003 7:00 PM
> To: Vincent Frégeac; 'Aaron'; 'Audi - Scars'
> Subject: Re: [s-cars] DIY Boost control
>
>
> The ECU will still cut off fuel and or ignition at a predetermined amount
of
> boost after a predetermined amount of time.
> I have battled with this with my Stage 3 software, and the solution was to
> wind out my waste gate spring.
>
> If you do get into a situation where the ecu no longer controls the WGFV
or
> it doesn't control it properly and you get this cut out, you will notice
> that you will no longer be able to pull much boost at all. You can fix
this
> my restarting the car.
> This was the good old 100 MPH reboot, as I always had to do it in 3rd at
100
> MPH. Imagine why :)
> But, what you will really need to do is reset the ecu. Since these ECU's
> adapt to engine conditions, it will remember the overboost condition and
the
> next one will occur at a lower boost level.
>
> I now have a special switch on the dash to drop all power to the ecu so I
> don't loose all the memory setting in the whole car.
>
> Ok, a bit winded of a post but WTH.
>
> Mark S
> ----- Original Message -----
> From: "Vincent Frégeac" <vfregeac at sympatico.ca>
> To: "'Aaron'" <aaront at cox-internet.com>; "'Audi - Scars'"
> <s-car-list at audifans.com>
> Sent: Monday, September 08, 2003 7:09 PM
> Subject: RE : [s-cars] DIY Boost control
>
>
> I've seen this design posted a few time. Main problems: if your car
> start pinging, you're on your own. If the altitude or rpm is too high
> and the turbo over-spin, you're on your own. In summary, no safety. It
> may cost you a turbo or an engine. No BTDT, though, but I don't think
> I'll ever BTDT.
>
>
>
> Vincent.
>
> -----Message d'origine-----
> De : s-car-list-admin at audifans.com
> [mailto:s-car-list-admin at audifans.com] De la part de Aaron
> Envoyé : 8 sept. 2003 14:11
> À : Audi - Scars
> Objet : [s-cars] DIY Boost control
>
> Hi all,
> I came upon this article on DIY boost control.  Anybody tried it?
> http://www.autospeed.com/cms/A_0670/article.html?popularArticle
> Comments? If it aint broke, why fix it.  etc.....
> Thanks
> Aaron
>
>
>
>
>
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