[s-cars] GT2871 is in!

[Theodore Chen]

gabriel,

i have MTM stage II+ right now.  that includes an RS2 exhaust manifold,
chips, and 3 bar pressure transducer.  i had that on the car already.
you're right about the scaling.

with the stock turbo, i normally saw a peak reading of 2.1 bar, 
occasionally 2.2.  now i'm seeing 1.9 bar, very rarely 2.0, and sometimes 
1.6 or 1.7 bar.  multiply all numbers by 1.2 to get the true numbers.

i'm tempted to disconnect the wastegate and see what kind of boost i
get, but i'm rather afraid of blowing up the engine.  we get 91 octane
here in california.

-teddy

--- Gabriel Caldwell <gabriel at ts.bc.ca> wrote:

> The Audi S4 ECU comes stock with the 2.5 bar pressure sensor, and can be
> upgraded to the 3.0 bar unit (as you probably did along with the
> software). In this case, you have the 1992 Audi S4 with the digital
> boost gauge in the instrument panel, you now must multiply the stock
> boost gauge reading by 1.2 when you upgrade to the 3.0 bar pressure
> sensor.
> 
> Gabriel Caldwell
> 
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Theodore Chen
> Sent: October 19, 2006 12:31 PM
> To: s-car-list at audifans.com
> Subject: [s-cars] GT2871 is in!
> 
> last week, i completed the installation of the GT2871 hybrid turbo that
> i 
> got from 034motorsport.  i've been driving the car for about a week now,
> waiting to see if anything would break.  so far, nothing has, so i think
> it's safe to assume it works.  i was surprised when i fired up the car
> and nothing exploded or leaked.  usually there's some niggling issues.
> 
> it was much more work than i expected, primarily because of the oil and
> coolant lines.  clearance is pretty tight and there isn't a lot of room
> to route the lines.  almost every step of the process presented issues.
> definitely not a drop-in, but i should know that by now.  it would have
> helped a lot to have written instructions for the install, but i didn't
> get any with the kit.  if anybody wants, i can run through some of the
> issues i ran into during the installation.  i could do it much faster
> next time around.
> 
> special thanks to dave dawson, who patiently answered my many questions
> and offered advice and encouragement when i was ready to give up and
> throw
> a grenade in the car.
> 
> the difference is noticeable at 5000+ rpm, where the stock turbo used 
> to fall off quickly.  the GT2871 keeps pulling well past that.  it seems
> to be falling slightly at 6500 rpm.  it may be my imagination, but the 
> car seems to be faster than before at the same boost level as stock.  
> more efficient turbo = less heat in intake charge = more timing advance?
> 
> there's one problem, though.  the digital boost gauge (I have a '92)
> isn't going as high as it used to.  peak boost seems to be lower than
> with the stock turbo, and i haven't figured out why yet.
> 
> the 2bennett hose places the nipple for the WGFV on the front instead
> of on the side like the stock hose did.  however, this means if i try
> to plug the WGFV into the nipple, it interferes with the plastic intake
> snorkel.  right now, i have a 90 degree plastic nipple and a piece of
> hose to connect to the WGFV.  the WGFV is sitting below the intake hose
> and held in place with a zip-tie to the hose.  i wonder if this 
> configuration is the cause of my low boost.
> 
> what do people do about installing the WGFV with the 2bennett hose if 
> they still have the intake snorkel?
> 
> -teddy
> 
> 
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