Intakes/ECU's/Ignition - was Passat TB

["Brian Haygood" <Scirious@hotmail.com>]

Just remembered something I was figuring out a few months ago concerning
this.  If you want a more accurate way to measure air coming in to the
engine, use a hot wire air mass sensor like any decent modern car does.  It
has a variable voltage output just like a TPS, and all of the fancy
controlling and stuff is done inside the sensor's own unit.  So you just
give it power and ground and read the signal, just like a TPS.  I don't know
the voltage range, so you might have to scale it or something, but it should
work better than a TPS, right?

The part I didn't figure out was how this would mess with the correction
factors in an ECU that thinks it's reading TPS.  The temperature
compensation map can be flat-lined because the Mass-air accounts for that.
Only thing I know of that it doesn't account for within the sensor is
humidity, but no other system does either, right?

So I'd review my thermodynamics before I attempted it, but it sounds like a
much more reliable and accurate fuel metering solution (which is why new
VW's use it, huh).

So that leaves me with a corvette dual throttle body split to twin mass air
sensors, right?  Anyone keeping track of how much these dreams are costing
me?

-BH

----- Original Message -----
From: Cory Langford <cory.langford@icbc.com>
To: Scirocco Listserv <scirocco-l@scirocco.org>; <jdbubb@ix.netcom.com>
Sent: Thursday, November 08, 2001 10:38 AM
Subject: SDS/Haltech - Was: Passat 16v throttlebody on Scirocco?


>
>
>  Any furhter info would be greatly appreciated.  I know I am currently
> looking around at systems.  Any info on Distributorless (4 individual
> coils) would be nice, as that is what I am looking at.  Already have the
> G60 fuel rail for electronic controled injectors.
>
> Thanks,
>
> --
> Cory Langford
> '86 2L Oettinger Turbo Project
> '82 beater driver
>
>
>
> -----Original Message-----
> From: Dan Bubb
> Sent: November 8, 2001 4:28 AM
> To: Jonathan Pack
> Cc: Brian Haygood; Scirocco-l; Dave Ewing
> Subject: Re: Passat 16v throttlebody on Scirocco?
>
>
> An SDS configured to drive distributor ignition for a 4 cylinder costs
> $970. A TPS (that the Haltech comes with) cost an extra $63 from SDS.
> So, that's $1033 to get it to a level to compare to the Haltech kit.
> E6k Haltech is $1145 and it doesn't need options for fuel pump relay,
> fast idle, turbo boost control, etc...
> That sounds more like 90% of the cost of the Haltech. Not the hopelessly
> exaggerated 1/3! Not to mention when you get done adding all the other
> stuff needed to convert a CIS VW you've tacked on an additional $500
> minimum for either system. So the cost difference is $110 and there's a
> ton of shit the SDS won't do that the Haltech will.
> Don't get me wrong; I considered SDS and TEC II (and a bunch of others
> that were either relatively pathetic or much more expensive) before I
> bought the Haltech. It's the basic control approach of the Haltech (and
> most of the high end systems) that is the reason I bought it.
> I'll be glad to elaborate (at length) on the basic control approach of
> SDS vs. Haltech when I have a little more time.
> Dan
>
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