Boost Leak??

[Mike Marnik]

Ok so this weekend i decided it was time to turn the boost up past 15 psi. Well i backed the screw out about 2 turns on my turboxs mbc (yes the correct direction) and it would shoot up to 17psi then drop off to 15 then come back to 16. So i screwed it out some more tonight because it was only getting 15psi, and it didnt do anything. Im assuming that i have a boost leak somewhere because i have the screw backed out to almost flush with the top of the boost controller also sometimes when at wot near 15 psi or so it will start to backfrie/pop. So im assuming that i have a boost leak and my system can only hold 15 psi. I also would like to know how much boost i can theoretically run using the turboxs mbc. My local dragstrip opens this friday and a few local dsmer are going out and i want to get this nailed down before then so i can run 17-18 psi on race gas.
Also where cant i get 2.5in outside diameter hose so i can finish off my boost leak tester i asked at advance auto and the hardware store.

 

[DSMcamaro]

You should be able to get a 2 1/2" piece of hose from any hardware store. Check the plumbing section. I believe 2" plumbing house is actually close to 2 1/2". Dont ask me why, thats just what I found. I also have a turbo XS MBC and when I first hooked it up i ran about 20psi but now im at about 15.

 

[majik2k5]

From a few people I've talked to, the TurboXS MBC is rumored to be unreliable and prone to leaking. I wouldn't know for sure though.

 

[Mike Marnik]

i will have to try my friends out today although his is the same one. I might be able to do a boost leak test today but its kinda hard when im away at school and my stuff is back home.

 

[majik2k5]

You can ebay an MBC for like 4 or 5$, if that. Or, you can always build your own. There's a tutorial in the Tech section on how to build them.