Performance tip for throttle body?

[Larry C Leung]

Your 16V Jetta already had the bigger bore TB.

LL - NY

On Tue, 18 Dec 2001 21:47:32 -0500 "Rave Racer" <Ravewar at rogers.com>
writes:
>
>    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"
>>   >>
>>
>
>