I tried to contact TiAL and didn't have any luck so if anyone can help me out it would be appreciated. I am currently running spring pressure off of my TiAl 46mm wastegate for boost control. Electronic boost controls are very cool but I figure simpler is better ( Less to go wrong ) so I am going to try a High temp air regulator. The same design as the Greddy T.V.V.C. but made out of plastic instead. Good for 150F according to the manufacturer. $21.00 with bracket. Right price too. If it dies I won't over boost, I will just loose boost. ( The internal rubber diaphragm will break letting air bypass it dropping me back to standard wastgate spring pressure.) I am unable to post a diagram of my idea. Here's my dilemma. -

TiAl instruction manual states to run 1 line minimum ( 6 mm.) after the compressor - split into 2 directions-
One to the side of the wastegate.
The other with the regulator then a small air bleed then to the bottom of the waste gate.

Easy - now my questions -

1) How big a bleeder hole should I use?

2) If I put a solenoid between the bleeder hole and bottom of the wastegate, could I run off of my spring pressure for low boost ( Solenoid closed )and open the solenoid for higher regulated boost. ( Does the lower opening of the TiAl wastegate need to be open to work properly. I think so. ) Or should I run a 2 way solenoid. One way open to atmospheric pressure the other to regulated pressure. (This would let me run wastegate spring pressure for one boost level and regulated pressure for another.)

3) I can use 2 air regulators with a solenoid in-between them to control 2 different boost settings.( Does anyone have a suggestion for a high temp. 2 way solenoid.) I have looked but haven't come up with much.

I plan on making a bracket mounted behind my steering wheel so I am able to change between 2 different boost settings continuously with a push of a button. 1st and 2nd gear are currently useless to me. ( Excessive tire spin wasting rubber, money and my time)

Thanks in advance for any input or a better idea.

 

I can't believe it 24 hours no response. I just can't see why people spend $300 for a Greddy B-Spec Boost Controller not including shipping ( 2 settings only ) or $200 for a T.V.V.C. mechanical one which only lets you use one boost level when you can put togther a setup for much less than half of that which works just as well if not better. Some one has had to done this before. This is old school stuff. I am just not use to working with an external wastegate. I guess I will figure it out. Maybe for under $60. I just wanted some input. I would love to buy a APEX'i AVCR but I have more pressing needs that need to be addressed first. Making a four point roll bar, insalling suspension, wheels & tires, brakes and painting my beater. Hey it only takes time am $. Oh well stile waiting for input.

 

You can use a 3 way solenoid valve to divert air through the boost controller (manual ball and spring or pressure relief valve), or directly to the wastegate and have the spring control boost. This is a simple way to have 2 boost set points. Ball and spring boost controllers work great and are very cheap to buy on Ebay or make yourself. I'm in the process of putting together an electronic boost controller using a digital pressure switch and a 2 way solenoid valve. I'm doing this for less than $100.