[s-cars] GT2871 is in!

[Theodore Chen]

--- Marc Swanson <mswanson at sonitrol.net> wrote:

> On Thu, 2006-10-19 at 12:30 -0700, Theodore Chen wrote:
> > 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.
> 
> cool, good work!
> 
> I installed the 3071 in my car as you know, we exchanged a few emails on
> your install I think.

we did, and thanks for the advice and support.  as a matter of fact, i'm
sure i missed other people, so thanks, everybody.  this list is a great
resource.

> > 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.

i forgot to mention that turbo lag doesn't seem any worse than stock,
which was important to me because i still want to win stoplight races.

> > 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?
> 
> absolutely, you should most definitely notice more power at lower boost
> levels, the reason is simple, MORE AIR.  because the charge air is
> cooler at these pressure levels than the stock turbo or even rs2 means
> more air volume (CFM) at a given pressure level.

cool!

> > 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.
> 
> see below
> 
> > 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.
> 
> yep.  BTDT.  I was running the same setup, stock intake snorkel and the
> 2B hose so I used a small plastic tube to put the WGFV where it fit
> better.  This causes the valve to back feed pressure through itself,
> causing lower than normal peak boost.  On my car I'm not running the
> stock intake snorkel anymore, nor the airbox for that matter.

i have about 6"-8" of hose coupling the WGFV to the 90 degree nipple.
maybe i can move the WGFV closer, and make the hose a lot shorter to
reduce backpressure.  but that 90 degree nipple is likely a restriction,
too.

i have no idea why 2bennett thought it'd be a good idea to put the nipple
on the front of the hose.  right now i'm getting inconsistent low boost,
just like when the old WGFV started failing.  it's not as bad - sometimes
the old WGFV gave me WG spring pressure only.  this one is still getting
me a decent amount of boost.  just not all of it.  and dammit, i want
every ounce of boost i paid for.  :)

-teddy


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