Manual Boost Controller questions

[Shane-O]

I did search for the answer first and found one of them.

I bought a MBC off evilbay to put on my GTX. My GTX has 2.5 exhaust, VJ11, and an RX-7 IC. Can the MBC turn the boost down? It is over boosting at the moment and I have to wait to chip the computer to run higher boost. The MBC does not seem to be turning the boost down and the more I think about it, I cannot figure out how the MBC would reduce the boost from stock. I am thinking that the wastegate needs to be resprung to achieve what I want, is this correct? I had the MBC connected to the wastegate and to the intake at the port on the cast aluminum pipe that feeds the TB. I did find via search, that I should use the port on the compressor housing and will try that tomorrow. My GTX does not have the stock air valve set up anymore, but does have a DSM BOV pipe on it, and it is working properly.

Thanks!
Shane-O

[slownrusty]

I did search for the answer first and found one of them.

I bought a MBC off evilbay to put on my GTX. I am thinking that the wastegate needs to be resprung to achieve what I want, is this correct? Thanks!
Shane-O

Yes..correct, the wastegate will set the min. boost pressure.

[trailrider098]

wastegate is around 8lbs from the factory. for many people who add better flowing intakes, exhaust, and intercoolers will end up overboosting the stock system.

unfortunatly, the stock wasetegate is a sealed unit and cant be resprung. Most IHI turbos for this generation will also use 7-9lb springs. if you are still overboosting before you chip the car i would do something to reduce boost pressure so you dont lean out the engine. try putting your stock IC back in or throw a smaller diameter section of pipe back in the exhaust

[Rocketman]

If you want to invest the time, porting the stock wastegate will also help reduce boost creep or overboost

[_Shocker_]

What boost controllers are you guys running ?

[bighed323]

$5 eek-bay special. i did go get a different spring to put in it.

[_Shocker_]

So is this acceptable?

http://cgi.ebay.com/ebaymotors/Manual-Boost-Controller-Control-Porsche-Audi-BMW-Black-_W0QQcmdZViewItemQQhashZitem25574b54a9QQitemZ160378344617QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

[Rocketman]

So is this acceptable?

http://cgi.ebay.com/ebaymotors/Manua...Q5fAccessories

Thats the style I used for a very long time. It worked very well but I needed to change to a different spring I think.