RE: programmable engine management

["Scott F. Williams" <sfwilliams@home.com>]

Why do you advise not using a vacuum canister for MAP in the throttlebody
situation? As you acknowledged, the point of using the canister is to dampen
the pulses. So, why avoid it?
--
Scott F. Williams
NJ Scirocco nut
Golf GTI 16v rallycar
Mazda 323 GTX turbo assault vehicle

Check out our rally team's website!
http://www.usrallyteam.com

> -----Original Message-----
> From: owner-scirocco-l@scirocco.org
> [mailto:owner-scirocco-l@scirocco.org]On Behalf Of Brian Haygood
> Sent: Monday, September 17, 2001 11:13 PM
> To: lauri.pettai@netexpress.ee; sixteen.volt@verizon.net;
> sfwilliams@home.com; rapieper@yahoo.com; scirocco-l@scirocco.org
> Subject: Re: programmable engine management
>
>
>
> I haven't read EVERY post on this topic, but a few of the last ones.
>
> My experience:
>   Using TB mapping on a Haltech F9 or F9a on restricted bike engines.
> My $0.02:
>   Haltech requires that you hook up the MAP sensor even if you
> are doing TB
> mapping.  I can't recall exactly, but it uses the map pressure to correct
> for something or other.  Don't know about TEC, but it may require
> installation of the MAP even if it isn't used for MAP mapping.
>
>   Someone asked how TB mapping allows correction for temp, humidity and
> altitude.  Altitude is corrected by measuring air pressure (I
> think this is
> where the MAP comes in).  Temp is corrected by an ambient temp
> sensor, and
> on Haltech's, the temp correction is tuneable.  Humidity itself is not
> corrected for, I believe, and is part of the O2 sensor's job.
>
>   My other 0.02 is that, in my experience, TB mapping works
> better than MAP
> mapping, though I have heard some people say that is a problem with
> Haltech's.  For the Badger5 setup, I would imagine that TB is much more
> reliable just because the pressure waves are going to be so
> nutty, and even
> if you route the 4 lines to a common canister to dampen the
> pulsations, it
> seems like this is not going to be as accurate a reading as you
> would want
> for primary fuel mapping.
>
> My suggestion:
> Use TB mapping, with the MAP hooked up to all 4 inlets without any extra
> provision (i.e. canister) to dampen waves.  A small reservoir
> wouldn't be a
> bad idea, but I'd probably try it without.
>
> Sincerely;
> Brian Haygood
>
> >From: "Lauri Pettai" <lauri.pettai@netexpress.ee>
> >To: "Neal Tovsen" <sixteen.volt@verizon.net>,   "Scott F. Williams"
> ><sfwilliams@home.com>,   "Cheapass Ron" <rapieper@yahoo.com>,
> "Scirocco-L"
> ><scirocco-l@scirocco.org>
> >Subject: Re: programmable engine management
> >Date: Sun, 16 Sep 2001 20:03:09 +0200
> >
> > > > > So where does the airflow meter
> > > > > go????   Where am I stupid here?  What is my wrong assumption???
> > > >
> > > > Yo, Cheapass! Your amusing incorrect assumption is that the
> state of
> >the
> > > > fuel injection art is still stuck in an eighties timewarp! :^) We
> > > > don't need
> > > > no steenking airflow meters anymore! Consider that the load on the
> >engine
> > > > must be measured somehow. There are two ways of doing this: either
> >measure
> > > > the amount of the air flowing in (our scenario), or measure the
> >manifold
> > > > pressure plus other related functions.
> > >
> > > I don't think Ron's stuck in the 80's, though he /is/ an old
> chap! I was
> > > wondering the same thing too. And I'm not looking for a floating
> >mechanical
> > > plate, either!
> > >
> > > I think we were both just wondering if there was a place to
> mount a MAP
> >or
> > > MAF sensor. On any car I've known, the MAP or MAF is mounted to the
> >intake
> > > before the individual cylinder runners split, but on a separate TB
> >system,
> > > there is no such place. I suppose it could be only mounted on one TB
> >with
> > > calculations to account for four cylinders, but at a glance,
> it doesn't
> >even
> > > look like there's room for any such sensor below the air horns. Where
> >does
> > > it go?
> >
> >Hmm... Scott is probably stuck in nineties. :) We do not even need a MAP
> >sensor
> >for TB conversion. The engine load is only measured by TB
> sensor. TB sensor
> >is
> >usually used for acceleration enrichment, but when doing a TB
> conversion it
> >has
> >to be used for both. As you said that there's no place to connect a MAP
> >sensor
> >and even if you run a separate vacuum wire from each runner then
> you get a
> >MAP
> >pressure that is so jumpy that you can't map nothing with it so
> TB sensing
> >is the
> >only way to do it right. At least my system is set up like that and it
> >works.
> >
> >Lauri!
> >'84 2.0 16v Scirocco GTX Kamei X1 Bodykit (VIN025736)
> >http://www.eabc.edu.ee/~laurts/scirocco
> >I finally added something new to my site!
> >
> >
> >
> >--
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> >
>
>
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