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Old 01-29-2006, 09:47 PM   #1
hwy61
Scooby Specialist
 
Member#: 87950
Join Date: May 2005
Location: B,ham AL
Vehicle:
2005 STI
Gone....Somewhere in MS

Default What's going on here????

'05 STI, FP Green, stock BOV, stock tmic, Forge MBC, TXS Iron up-pipe, TXS turbo back, Topspeed tune, ecutek, stock box with K&N, stock muffler, etc.....

Ordered the little brass orifice that was inadvertently lost by turbo installer (not Topspeed) and installed it. Able to make boost but here is what is happening. Can find no leaks. 5th or 6th gear can easily obtain 19/20 lb boost, boost gauge needle holds very steady, waste-gate set to allow no more boost than this. No creep is apparent. No high RPM driven in these gears though, at least nothing near red-line.

lower gears, the boost needle fluctuates rapidly between 15 and 18 psi on WOT. All the way to red-line. MBC seems to make no difference on increasing boost beyond this point in free revving gears.

Seems if the system will hold 19 lb boost for an extended period, then there is no leak, and either the turbo is not supplying enough air or something else is going on. Any ideas. The boost gauge is t'd into the intake manifold on the passenger side of the manifold runners at a stock brass port located there. Engine runs fine and car is fast but I don't seem to be making the boost I should when the engine revs quickly and is the fluctuating needle normal. It never did this with the stock turbo. Hwy61
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Last edited by hwy61; 01-29-2006 at 10:01 PM.
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