[Supras] What is Max Boost for a MIII Stock Engine

[Sean Cavanaugh]

Stock intercooler can handle the pressure, but it is nowhere near as 
efficient as an aftermarket. I would definitely upgrade the intercooler, 
especially if yer gonna be running higher boost.

-Sean

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From: "Dan Gyoba" <dgyoba at abstractconsulting.com>
Sent: Wednesday, November 28, 2007 11:33 AM
To: "Daniel Hodges" <daniel at hodgesit.com>; <supras at supras.com>
Subject: Re: [Supras] What is Max Boost for a MIII Stock Engine

> Well, I know that people have done 20+ PSI on a stock bottom end, but 
> there is definitely work to be
> done before that point.
>
> The fuel system is good to about 12 before something needs to be done.  A 
> Lexus AFM and larger
> injectors, or a stand-alone EFI system (and larger injectors) is the real 
> way around that.  An FCD will
> get you by, but you run the risk of a lean mixture, which will result in 
> things breaking.
>
> Some will argue that the stock head gasket/bolts/torque spec aren't up to 
> stock boost.  They may well
> be right.  I think that the stock gasket may not be as bad as all that, 
> but at the very least, the
> torque spec for the factory bolts is too low.  Certainly a proper metal 
> head gasket job is stronger,
> though.  (Yes, I see that you did the head gasket, but you didn't specify 
> details.)
>
> The BOV will need to be better to handle the larger pressures and airflow 
> as well.  The stocker isn't
> up to anything more than the stock fuel system, from what I understand.
>
> The stock intercooler is supposed to be a good one from what I understand, 
> but an upgrade will still
> help you make more power at less boost pressure.
>
> And, as Jeff said, it comes down to POWER.  It's not about boost pressure, 
> it's about the O2 that the
> engine takes in and uses to burn fuel.  That's what makes the power, and 
> puts stress on the engine
> components.  14 PSI on a stock CT24 isn't the same as 14 PSI on an 
> upgraded CT26, which isn't the same
> as 14 PSI on a T04.  Assuming that you have an upgraded CT26 from your 
> description, as long as the rest
> of the system (Fuel, intercooler, BOV) is up to the task, you shouldn't 
> have any real trouble running
> that turbo up.
>
> On 28 Nov 2007 at 14:05, Daniel Hodges wrote:
>
>> Hi Guys,
>>
>>  What is the maximum boost a Stock MIII will take. Turbo has been
>>  redone
>> good for 20 PSI Head and gasket have been redone. Have not touched the
>> bottom end.
>
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