gp-7mgte said:
Could be something wrong with the wastegate? If the vacume hose to the waste gate is leaking/off, wouldn't the turbo keep boosting until fc? Or do I have it backwards and the turbo wouldn't boost at all?
turning boost up?
- Thread starter fastsupralife
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Could be something wrong with the wastegate? If the vacume hose to the waste gate is leaking/off, wouldn't the turbo keep boosting until fc? Or do I have it backwards and the turbo wouldn't boost at all?
starscream5000 said:
97TSiAWD said:
It's pressure not vacuum that causes the wategate actuator to function...its source is located on the turbo compressor housing. That why the bleed type MBC's work. They bleed off some of the pressure to prevent the wastegate from opening to allow a higher boost level.
97TSiAWD said:Oops, I meant to say "if it has no vacuum source" instead of signal.
Actually you should have said "if it has no pressure source"...there is no vacuum going to the wastegate actuator
Sorry, that's the DSMer in me talking; we typically run the boost control source off the intake manifold instead of the compressor housing of the turbo.jdub said:Actually you should have said "if it has no pressure source"...there is no vacuum going to the wastegate actuator
But on the topic of Supras, you do have it worded better.
jdub said:That is correct
Fuel cut is triggered by airflow measured at the AFM...it has nothing to do with the psi the stock boost gauge is sensing at the manifold. Classic symtoms of a boost leak is hitting fuel cut (occurs at ~12 psi w/ stock AFM housing) and showing less on the boost gauge (say 6-8 psi).
This assumes you already have the boost turned up to the 12-14 psi level.
this exactly what happend to me but it only happened after i put the elbow back exhaust. before i was just running straight out of the stock elbow and d/p, and i never fit fuel cut at around 8psi. now its reading like 6psi and i get f/c.
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