[Supras] 57 trim CT@ boost capability

[berniek at technicaldevelop.com]

    The NAPA here sells worm drive clamps but they are nothing like you 
have ever seen.  The are super heavy duty, 3/4" wide, with a stack of 
Belleville washers under the screw to hold tension.  They are $5.00 each.


       Bernie

Jim Jobe wrote:
> 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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