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· Registered
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Discussion Starter · #1 ·
Ive been researching about the Greddy BCC and have a question to ask everyone. After installing the BCC and adjusting the voltage to 4.3V(for 98 engine), at what boost level would it cut or is it infinite? Is there a way to adjust to where it will cut boost at certain PSI?

For example the MR2 turbo, I was able to make a circuit and its adjustable base on where the pod adjustment was set. Everyone say to set it at 4.3V, but does this mean Im going to loose all of my boost cut protection?

To summarize:
The purpose of factory boost cut is to protect the engine correct? Does Greddy BCC elimnate that protection and if not, then at what boost level does it cut at 4.3V setting?
 

· Registered
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that BCC setting is a "clamp" voltage that is just below the threshhold where fuel cut will occur...so clamping it there completely prevents fuel cut used to limit boost. Some people here report experiencing fuel cut even with a BCC but those are "problem" cases, not normal.

Limiting max boost can be done by maintaining some restriction in the exhaust; this is like the JDM guys who use a restrictor plate in the exhaust to prevent boost creeping up too high...they have more problem with that since the JDM wastegate is smaller than the USDM and the turbos are somewhat more "delicate". For example, if you install a full downpipe onto the stock catback, the added restriction will limit boost quite a bit lower than if you had a full 3" catback. Or since you're in CA with nazi car mod laws, maybe consider keeping the stock cats and catback and that will be a good restrictor setup.
 

· Boost4fun
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1,931 Posts
If you still want to retain a boost cut in your car for safety purposes you should buy a HKS FCD. This devise does not clamp the voltage at a given point but is rather a voltage splitter. You can dial it in where you want to have boost cut to occure.
Hope that helps.
 
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