[Supras] 57 trim CT@ boost capability

[Jim Jobe]

Just a tip, Napa also sells t-bolt clamps.  They are
much better than any worm drive clamp.

On Wed, Dec 26, 2007 at 09:04:45PM -0500, berniek at technicaldevelop.com wrote:
> 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
> >
> >
> >
> 
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