[Syty] overboost

Fri Aug 3 01:04:49 CDT 2007

I cant remember how this thread started in regards to how your truck is 
equipped.. If its a stock turbo/wastegate combination please read on.. If 
its aftermarket disregard the following. It has been common knowledge for 
sometime (atleast as long as I have been in SyTy's (9-10 years)) that it 
will overboost with the stock wastegate. Its been proven time and time again 
that the stock setup is "marginal" at best WITH THE CAT CONVERTER IN PLACE. 
I too had problems with mine wandering when I started to crank up the boost 
past the stock specs (even with the cat in place on my truck). The wastegate 
cylinder & spring setup is just too small to accomodate the pressure change 
with no catalytic converter in place (i.e. the exhaust flow increases enough 
to cause problems here).  The best option is to consider aftermarket 
wastegate setup, or if its still available, there used to be replacement 
wastegate actuators that were larger than stock and helped address this 
problem (think it was a hybrid off a Buick setup).  Most people get an 
external and have the internal welded up if they elect to stay with the 
stock setup.

Hope this information helps, best of luck !

Todd
'92 Ty #0488 <-- Conversion to Turbo LS6 power underway.

----- Original Message ----- 
From: <eqs at frontiernet.net>
To: <syty at syty.org>
Sent: Thursday, August 02, 2007 9:32 PM
Subject: Re: [Syty] overboost

> Run a high flow catalytic instead but there still something wrong there.
>
>
> Quoting Lowell Raison <lowell at raisongroup.com>:
>
>> Replaced the tube and checked the wastegate. It seems to be working 
>> right.
>> Does not shut down every time, but it is not very comforting knowing it
>> might shut off right when you need the power. When it doesn't shut down, 
>> it
>> runs strong. Beginning to think I might need the CAT back on.
>>
>>
>>
>> Anyone know where I can get datamaster (along with tutoring in how to 
>> read
>> it) and cable? With two Tys and no mechanics in the area it is probably 
>> time
>> to get it.
>>
>> Lowell
>>
>>
>>
>>
>
>
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