RE: 16v fuel enrichment module

[Brian Honnold <bhonnold@pac-cap.com>]

Errrr, ummm 

Thanks Brett for that enlightenment.....couldn't have said it better myself.

One minor point though....The TT module uses a resistor of 1100ohms.

thank you all for playing

Brian Honnold
'78 Rocco Ragtop
'99 Passat GLX

On Tuesday, April 13, 1999 9:45 AM, Brett P VanSprewenburg [SMTP:brettv@rocketmail.com] wrote:
> ---Pei-Chung Ting <chungsteroonie@yahoo.com> wrote:
> 
> > I heard that Mr. Brian Hannold from this fine list has in the past made
> > fuel enrichment modules for 16v sciroccos.  Can you get in touch with
> > me to explain how your setup works and compares with other ridiculously
> > over-priced TT and autotech products on the market?  I'd appreciate any
> > advise on this matter.
> > 
> > Thanks for your time,
> > 'Chung
> 
> Once more into the breech...
> 
> Anyway, there are pluses and minues to both boxes.  Autotechs box supposedly
> works with vacuum, rpm's, and full throttle while the TT box only works
> under FT.  Autotech also directly modifies the DPR current, while the TT
> box works a bit more within the system and only tries to fool the computer
> into thinking that the engine is 'cold' and requires more fuel.  Both
> approaches can work, but practically, things sometimes work a bit differently.
> 
> The TT box is very very simple to make yourself.  Here's how it works:
> 
> The coolent temperature sensor (CTS) on the side of the cylinder head works
> like a resister that varies it's value with temperature.  As the car warms
> up it changes, the computer reacts to this input (as well as others) by
> changing the current sent to the dynamic pressure regulator (DPR) on the 
> back side of the CIS-E fuel distributor.  The TT box works by substituting
> a different resistance value (one indicating a cool engine) for the CTS
> when the full throttle enrichment (FTE) swtich, on top of the throttlebody,
> is activated by the gas pedal.  The TT box does this by tapping the 'cold'
> side of the FTE switch (N/C) so that when the switch closes, 12v flowing
> through the swtich also activates the relay.  The relay is also plugged
> into the CTS, and the harness that the CTS is normally plugged into. Normal
> operation passes the CTS 'signal' to the TT box, through the relay, then
> back down to it's normal harness connector.  When the FTE is activated,
> the relay closes, and a set resistance value (around 1.9-2.2k ohms) takes
> the place of what-ever value the CTS was 'sending'.   This indicates a cold
> engine, the computer increases the DPR current, and less fuel gets sent
> down the return line, which means more fuel gets sent to the injectors.
> Everyone is happy. 
> 
> Unfortuneately, FTE can happen at any rpm and the engine doesn't always
> 'need' that extra fuel, and over-enrichment at low rpms most definitely
> causes engine bogging.  Which is why I made a box that senses rpms and
> varies the CTS resistance. :)
> 
> Is this FAQ material yet?
> 
> ==Brett
> 
> 
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