[Supras] 57 trim CT26 alteration

[Dave Henry]

I had a 60-trim CT26 with a clipped turbine, and it did make more HP than a 
stock CT26 but IMO it was not a very efficient unit.  The lag/hp was not 
what a good setup should be, and if you are going to spend the money you'd 
be better off getting an adapter and a small T4 or T3/T4.  I used a cheapy 
log manifold and a little T4 and it made almost 100 more HP and really 
wasn't much laggier than the trimmed CT26.  Just my $.02

DaveH


----- Original Message ----- 
From: "Rich" <rdp at ix.netcom.com>
To: "Jeff Mohler" <speedtoys.racing at gmail.com>
Cc: <berniek at technicaldevelop.com>; <Supras at supras.com>
Sent: Tuesday, December 11, 2007 8:43 AM
Subject: Re: [Supras] 57 trim CT26 alteration


>I agree with Geoff.  The power loosing restriction on the CT-26 is
> /through /the turbine area, which can be improved by clipping the
> exhaust wheel at the expense of more lag.  Making the wastegate larger
> doesn't increase flow through the turbine area...  If I were to bolt a
> larger external wastegate into my Infiniti, why would I expect any power
> increase?
>
> Also by removing material from an area of the casting already known to
> crack (wastegate flange) probably from heat stress, aren't you further
> provoking a problem in that area?
> -Rich
>
> Jeff Mohler wrote:
>> I have a few friends with VW diesel TDi's with VV turbos..nice.
>>
>>
>> But..the WG doesnt flow exhaust to make HP..it only needs to flow MORE
>> if you have too much boost, IE..creep.
>>
>> I dont see where a lick of power comes from a larger WG transit.
>>
>> On Dec 10, 2007 8:59 PM, berniek at technicaldevelop.com
>> <berniek at technicaldevelop.com> wrote:
>>
>>> After disussing it with (I forget who) at Performance Techniques, he
>>> agreed that the boost would come on faster without clipping the turbine
>>> wheel.  But then, what to do with volume of exhaust gas after spoolup?
>>> Bypass more at the wastegate, which is what we did.  The ideal solution
>>> would be variable geometry inlet guide vanes.  Although they made a
>>> brief appearance on cars some time ago, they seem to have become
>>> relegated to truck use, no doubt due to cost considerations.
>>>
>>>
>>>     Bernie
>
>
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