newbie question: boost curve.

[BMF_Racing]

Ok, just dynoed the car and i havn't pressure checked yet for boost leaks but I think thats not it. It would spike 21psi and this fall fast to 17.5 ish and hold steady from there. Is this something that the Red's 93 chip is controlling? or is it because of the mbc (Buscher) that im using?

it seemed like all i could ever get it to hold was 17.5 to 18 psi.

thank you in advance,

Brad

 

[BMF_Racing]

anyone ? ttt

 

[TurboBuRick]

What kind of wastegate?

Stock boost selonoid?

How are you cotrolling boost? Electronic device or mechanical?

 

[BMF_Racing]

What kind of wastegate?

Stock boost selonoid?

How are you cotrolling boost? Electronic device or mechanical?

- adjustable wastegate

- stock boost solenoid

- boost controlled mechanically ---> mbc
---> Buschur Racing manual boost controller




is the Red's 93 chip pulling the boost out ?

 

[Adam Connell]

Im using an RJC unit and I had leaks that caused unsteady boost like you describe. Also how is it hooked up?

 

[RUQWKNF]

Well for one thing, if you are still using the wastegate solenoid in conjunction with the Buschur controller, you will see this spike. The manual controllers are designed to work without the factory electric solenoid being hooked up vacuum line wise. With the solenoid still hooked up and controlling the final boost signal that the wastegate will receive, the 93 chip will command the boost solenoid to relieve some of the signal pressure, therefore lowering the boost.
You won't have any real boost control if you try to use the solenoid and the manual valve at the same time. It's either one or the other.
HTH

Patrick

 

[BMF_Racing]

Well for one thing, if you are still using the wastegate solenoid in conjunction with the Buschur controller, you will see this spike. The manual controllers are designed to work without the factory electric solenoid being hooked up vacuum line wise. With the solenoid still hooked up and controlling the final boost signal that the wastegate will receive, the 93 chip will command the boost solenoid to relieve some of the signal pressure, therefore lowering the boost.
You won't have any real boost control if you try to use the solenoid and the manual valve at the same time. It's either one or the other.
HTH

Patrick

Ok, after reveiwing the dyno graph below that looks like that is what is happening. It starts out strong and then the solenoid takes over and lowers boost to 17 psi.

so do I disconnect the vacum line from the boost solenoid on the pass. valve cover and let it breath the atmosheric pressure only using the mbc totally to control the boost?