[Supras] 57 trim CT@ boost capability

[Dave Henry]

Are you using mild steel or stainless?  FYI, I used mild steel for 
intercooler piping many a year ago, and I ended up with condensation in the 
pipes and rust.  I had orange streaks throughout the IC piping and into the 
throttlebody/intake manifold.  I did not like the idea of the engine 
injesting rustwater so I changed the piping out to aluminum.

DaveH


----- Original Message ----- 
From: <berniek at technicaldevelop.com>
To: "Walker, Brian (Rich. Dist)" <Brian.Walker2 at VDOT.Virginia.gov>
Cc: <Supras at supras.com>
Sent: Wednesday, December 26, 2007 8:04 PM
Subject: Re: [Supras] 57 trim CT@ boost capability


> Brian and group:
>
>
>    Just took a break from making up hard pipes from 2-1/4" thinwall
> steel tubing.  The Treadstone Spearco knockoff is due tomorrow.
> Although I enlarged the stock air box opening, the IC discharge hardpipe
> won't fit there due to the width of the HKS filter on the snout of the
> Lex AFM and the filler neck for the windshield washer.  Yes, the HKS
> lets a lot of dirt though, so it will be changed to something else,
> probably with 3" dryer vent hose to an element located below the
> headlight. I'll put a grille of some sort in the bottom cover there.
> No floods to worry about here.  In the meantime, I'm very careful where
> I drive.
>
>
>    I'm using the stock routing for the IC discharge pipe with a
> coupling hose where it emerges from the fender well (have my BOV in a
> 2", actually 2.4", copper tee there for connection to it).
>
>
>    The car in question is a '91 with 550cc, Lex, 57 trim CT26, 3" turbo
> back and everything that goes with it.  Had a stock '90 before, only
> moving the wastegate actuator diaphragm connection to the 3000 pipe.  On
> cool days I noticed almost no boost difference (plenum boost transducer
> only operates dash gauge, nothing more).  On 80F days, there was 2.5-3
> PSI more (actually 3 PSI occurred when near 100F) with everything
> stock.  Nonetheless, I'm now running 15 PSI at the intake plenum, so the
> upgraded intercooler and piping are a safety measure.
>
>
>    NAPA carries very good worm clamps with Belleville washers and
> radiator hose over 2-1/4" ID.  Wall strength seems more flexible than
> the Supra hose, however.  I may try some.
>
>
>    Bernie
>
> Walker, Brian (Rich. Dist) wrote:
>>
>> Bernie, you're still using stock IC and pipes right? If you're seeing
>> 15-17 psi at the manifold, you're already beyond 18 psi at the turbo.
>> Replacing the pipes and IC with something more headloss efficient
>> generally frees up 3 or so psi so I'd bet you're actually producing
>> 18-20 at the turbo now.
>>
>> Not sure why you you didn't see a difference when switching the WG
>> signal (psi) location. Seems if you moved it to the manifold, there
>> would be 3 or so psi you wouldn't be accounting for (assuming a manual
>> controller) and you'd see the normal max pressure plus any headloss
>> you are now bypassing.
>>
>> Brian
>>
>> Date: Mon, 24 Dec 2007 19:59:08 -0500
>> From: "berniek at technicaldevelop.com" <berniek at technicaldevelop.com>
>> Subject: [Supras] 57 trim CT@ boost capability
>> To: "Supras at supras.com" <Supras at supras.com>
>> Message-ID: <477055DC.4040005 at technicaldevelop.com>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> The fellow (Mario?) at Performance Techniques tells me that the 57 trim
>> mod is good up to 17 PSI from a bearing wear standpoint.  I'm getting
>> 15-17 PSI at the intake plenum so I'm over that at the turbo.  A
>> Treadstone Spearco knockoff is going in later this week, as are 2-1/4"
>> hardpipes, to get the turbo discharge pressure down.  I do know that
>> moving the waste gate actuator connection from the turbo discharge to
>> the 3000 pipe caused very little boost increase under all but hot summer
>> conditions (then it was 2.5 PSI difference with an all stock engine).
>>
>>
>> Anyone have experience with life of a 57 trim CT26 at probably 18 PSI
>> boost at the turbo?  Already thinking about an upgrade.  TO-4?  Needs to
>> fit Lipp elbow and stock exhaust manifold.
>>
>>
>>     BernieK
>>
>>
>>
>
> _______________________________________________
> Supras mailing list
> Supras at supras.com
> http://supras.com/mailman/listinfo/supras_supras.com
>