Performance tip for throttle body?

[Rave Racer]

    When I had my 16V Jetta the rumor was the TB from a 5000 would fit and
was had  bigger bore.  I never tried it but I drove one that was rumored to
have it.  Unfortunately I couldn't verify it, but I did find that it had
quicker pickup in the lower revs.  I would guess that it just moved the
functional power to a different part of the rev range.

       Rave Racer
'89 Jetta 1.8L 16V GTX
 http://www.vwot.org/members/Pete.html
'87 Audi 4000 Quattro Sedan
 http://www.audifans.com/registry/view.php?action=viewCar&carid=110
'72 Triumph GT6
 http://motorcities.com/contents/01I3H011116682.html
'83 Toyota Tercel (yoda)     Possible future Sandrail donor...  Maybe

----- Original Message -----
From: Iain Mannix <mannix at rmsolo.org>
To: <JShadzi at aol.com>
Cc: <ricematthews at msn.com>; <quattro at audifans.com>
Sent: Tuesday, December 18, 2001 11:10 AM
Subject: Re: Performance tip for throttle body?


Exactly.  And, from what he's saying, it sounds like he's doing
this to a non-turbo, Golf-esque TB - if you put that screw in like
he's talking about, the secondary will not open fully unless you
grind away the aluminium stop on the tb casting.

I've played with this, and it does _feel_ better, in some ways, but
it does not increase airflow into the engine - and without grinding
the stop/allowing the secondary to open fully, it probably loses(kinda
has to) some high end power.

100hp?  Not a chance.  -3hp?  Probably.


Iain Mannix(kinda like the old Weber Big Throat for VWs - they
feel monstrous on tip-in, but in reality, they're no faster, just
harder to modulate...)

On Tue, 18 Dec 2001 JShadzi at aol.com wrote:

> Ok, this guy is really confused, 100hp by opening the same throttle body a
> little sooner???  Its not like airflow into the motor is increasing, the
> final WOT condition is exactly the same.  What he is doing is basically
> re-calibrating the throttle cam on the throttle body to open the TB more,
> sooner, but not actually open it more overall.  He is feeling that what
used
> to be 1/2 distance travel with the "gas pedal" is now at 1/4 travel.
>
> If you do this, you will make the on-off throttle transition more sharp,
and
> inevitably, more jerky.  Everytime you get back on the gas the car will
lurch
> and the motor will snap back and forth on its mounts, not very pleasant
IMO.
>
> Anyway, you can try it, but its not worth even 1hp.
>
> Javad
> 80tq.com
>
> In a message dated 12/18/2001 12:24:58 AM Pacific Standard Time,
> ricematthews at msn.com writes:
>
> << Has anyone out there heard of the below described performance tip?  I
saw
>  this on the site www.grandtouring.com and wondered if this had any merit.
>  Thanks,
>  Mark
>
>  "I WOULD LIKE TO SHARE A TIP WITH AUDI ENTHUSIASTS WHO LOVE THE EXTRA
POWER
>  WHEN THE SECOND LARGER THROTTLE KICKS IN. PICK UP A SCREW AT THE HARDWARE
>  STORE FOR 5 CENTS THAT HAS A 5/16" OR 3/8" WIDE CAP WITH A SCREW LENGTH
OF
>  ABOUT 1/2" AND DROP IT INTO THE SLOT ON TOP OF THE THROTTLE LINKAGE WHERE
A
>  SMALL PIECE OF METAL HAS TO TRAVEL ABOUT 3/8" BEFORE IT HITS THE SECOND
>  THROTTLE ARM. BY BRIDGING THIS GAP WITH THIS SCREW THE LARGE AND SMALL
>  THROTTLE S OPEN IMMEDIATELY WHEN YOU GIVE IT GAS AND FEELS LIKE ABOUT 200
>  HP. I DONT FIND CHANGE IN GAS MILEAGE BUT THE CRUISE CONTROL IS NOT AS
>  SMOOTH AS IT SURGES SLIGHTLY AND ON LONG TRIPS I JUST POP THE HOOD AND
PULL
>  IT OUT AND PUT IT BACK IN THE CITY. WITH THE SMALLER 5/16" SCREW I DO NOT
>  FIND IT A PROBLEM ONLY WITH THE 3/8" WIDE CAP SCREW. THE DIFFERENCE IS
>  UNBELIEVABLE 100 HORSEPOWER FOR 5 CENTS.DOESNOT WORK FOR SOME TURBO AUDI
>  MODELS WHICH HAVE NO GAP TO PUT THE SCREW AS IT HAVES DIFFERENT LINKAGE"
>   >>
>