[Supras] Need CT-26 core and modifier recommendation

Sat Feb 3 20:29:39 CST 2007

Bernie, a quote from Arlene's turbo explanation on Supras.com pertaining to exhaust clipping " However, by just modifying only the compressor side (ie, a non-Gas Light/Innovative turb), the turbo will be limited by the exhaust side. Basically, when one has upgraded the compressor for a higher psi and RPM, the exhaust cannot get out fast enough. So, the turbine wheel is clipped to allow a little more flow at the expense of lag to allow for increased top end. The large compressor wheel also has its share of lag, which most don't mind for the absolute kick in the pants it offers once spooled up."
The article is here http://www.supras.com/06/techcenter/display.php?QID=79

hth,
Rockey 91T

berniek at technicaldevelop.com wrote:    DIV {  MARGIN: 0px }    Rocky, Nick, and group:

     Thanks for the good  information.  I'm wondering why the California rebuilder I spoke with  recommended only 50 trim.  It could have been because at least for the  moment, I'm remaining with two cats.  He also cautioned against exhaust  wheel trimming.  But, each rebuilder has his own opinion.   

     Any leads on a rebuildable core  would be appreciated.  Thanks again.

          Bernie
    ----- Original Message ----- 
   From:    Rockey Fox    
   To: berniek at technicaldevelop.com ;    t72pwrd ;    Supras at supras.com 
   Sent: Saturday, February 03, 2007 5:41    PM
   Subject: Re: [Supras] Need CT-26 core and    modifier recommendation

      Bernie,    FWIW I am pleased with my new 57 trim compressor upgrade. The exhaust was    trimmed a bit as well. It pulls much harder all the way up to redline and    seems to really coming on strong around 3000 rpm. I haven't really missed the    lower rpm spin up of the stock trim due to my driving style as I pretty much    am up in rpm to achieve desired speed then hit cruise control.
Currently    I'm running stock AFM with FIPK, stock 440 injectors and 3" defcon downpipe,    test pipe and 3" crinkly bend exhaust (previous owner). I'll probably put the    random technologies 3" cat back in line next time I have the exhaust apart. I    really didn't notice any difference between the test pipe and the 3" RT cat, I    just removed the cat before the rebuild of the turbo due to the excessive oil    leaking into the intake.
hth,
Rockey 91T

   -----    Original Message ----
From: "berniek at technicaldevelop.com"    <berniek at technicaldevelop.com>
To: t72pwrd    <nholden1 at woh.rr.com>; Supras at supras.com
Sent: Saturday, February 3,    2007 1:02:04 AM
Subject: Re: [Supras] Need CT-26 core and modifier    recommendation

   Nick:

    Thanks for the    info.  In  some manner we have discussed the    NJ
inspection system before.  At some point the dynamometers will    be removed
from the stations since the vast majority of cars are now OBDII    equipped,
and the dyno test takes time and money.  So for now I'm    going to remain with
both cats which means use of a 2.5"    elbow.  I did polish the inside of one,
for all that it might    matter.  Later, if I still have the Supra, I may
upgrade to a    single 3" cat, elbow and downpipe.  Already have an HKS 80
(85?)    mm exhaust installed.

    There was one rebuilder    in California I spoke with about a month ago who
did recommend only 50 trim    for street use.  According to his experience,
boost will start at    around 3000 RPM.  So at least there will be some
reduction of    waste gating to gain some power.  I'm curious what    your
experience has been with bigger compressor    trim.

    The rest of the mods will be a Lexus AFM,    550 RC injectors, Walbro pump,
EGT thermocouple and gauge.  This    may sound nutzoid, but I have an exhaust
gas analyzer with a long hose    which I can put on the driver's seat during
initial operation to insure    sufficient richness at WOT (also bought a camper
domestic water pump to use    with McMaster-Carr nozzles for water injection,
maybe to come much    later).  The analyzer option for tuning does not seem
that crazy,    considering that a wideband O2 sensor cannot be left in place.
Those items    will go in after the engine is in the car and inspected the
first time (its    a year overdue since its been down for 14 months).  I do
have a    mule car to drive for work, in addition to an old van for backup, so
the    Supra can be down again for the mods.  After the bugs are ironed    out, I
intend on making up a 2.5" piping system for the intercooler from    exhaust
tubing, since I have gas and stick welding    equipment.  What makes me scratch
my head a bit is a way of doing    a gradual transition from the stock 2" size
to 2.5".   When I    moved the wastgate actuator diaphragm connection to the
3000 pipe, the    factory boost gauge (and thus boost) read only 2 PSI higher,
maybe 2.5 PSI    on a hot day at most.  From what I've read for daily driver
use,    the stock intercooler is not that bad, but the piping is.  Most of    the
piping will be rigid, since I'm also using late MkIV engine mounts    which are
very stiff.

The the air filter box will go when I have    more time (very precious and hard
to come by).  But I start to    get discouraged when thinking about other
things like beginnings of rust    bubbling, worn driver's seat, 156K miles on
the chassis, and a myriad of    other little things to be done.  I almost
jumped ship and was    about to get a leftover GTO, but I know I'd miss the
Supra (the back of the    GTO is sickening, courtesty of your namesake down
under, nothing personal    of course), not withstanding the $$$ already spent
on Supra parts and time    spent.

Enough blabbing for now.  Gotta get power supply    design done for a client
who can become irate at any    moment.  Please let me know what your larger
trim expernences    are.  Thanks.

          Bernie

-----    Original Message ----- 
From: "t72pwrd" <nholden1 at woh.rr.com>
To:    <berniek at technicaldevelop.com>; <Supras at supras.com>
Sent:    Friday, February 02, 2007 8:25 PM
Subject: Re: [Supras] Need CT-26 core and    modifier recommendation

> I used Turbonetics many years    back:  http://64.225.76.178/main.htm (note
> they're    Performance Techniques not the realTurbonetics).  I was as    pleased
> as possible with their service, product and    delivery.  Turbo did NOT crap
> out or burn oil while I used    it.  The other option, IMHO is Jon ar MDC:
> http://www.mdcmotorsports.com/mdc%20front%20page.htm  No    personal
> experience, but the guy seems to do what he says and stand by    his work.
>
>
> I'd go bigger Bernie;-)
>
> Use    the dark side!
>
>
> ----- Original Message ----- 
>    From: <berniek at technicaldevelop.com>
> To:    <Supras at supras.com>
> Sent: Friday, February 02, 2007 7:31    PM
> Subject: [Supras] Need CT-26 core and modifier    recommendation
>
>
> > In the JDM rebuild I'm doing, I've    decided on a mild 50 trim compressor
> > upgrade.  I'll be    running 15-16 PSI maximum for a daily driver.  If
anyone
>    > has a rebuildable CT-26 core, please let me know.  As long as    the shaft
is
> > straight and there are no cracks or turbine wheel    damage it should be
OK.
> > Loose bearings or worn seals are not a    problem according to most
> > upgraders/rebuilders I've spoken    with.
> >
> > There were quite a few posts several weeks ago    about failure of rebuilt
> > turbos.  Anyone have any idea    of good rebuilder?
> >
> > Thanks.
> >
>    >        BernieK
> >    _______________________________________________
> > Supras mailing    list
> > Supras at supras.com
> > http://supras.com/mailman/listinfo/supras_supras.com
>
>
>

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