Boost drop/spike?¿?

[Bjeezy01]

Ok, So I installed a type-S BOV, and a MBC at the same time. Now when I boost, I hit the stock 15psi for a moment, then drop off to around 11psi and hold there. I am wondering if this is normal? When I had the stock BOV, and BCS set up I would go to 15psi, and hold it all the way to redline.... I am wondering if I should turn up the MBC so I spike higher, then settle at 15psi, but I am running the stock T25, and don't wan't to hurt/stress it. But I do feel a power loss with the new setup. Any ideas, sugestions?

 

[ADrewzki]

Generally you don't want it to spike at all. How many lines do you have hooked up to your type-s? Try using just one line to the upper nipple of the bov if you're not already and leave the bottom one off. Use the shortest hose possible for the mbc. I found that this helps also. Just letting you know things that worked for me. Also, is your bov and mbc tuned properly?

 

[Denji]

mine spikes to like 14 then settles at 11 or 12. I dont foresee that hurting anything. Also its pretty typical of the t-25 to do that.

 

[Bjeezy01]

Generally you don't want it to spike at all. How many lines do you have hooked up to your type-s? Try using just one line to the upper nipple of the bov if you're not already and leave the bottom one off. Use the shortest hose possible for the mbc. I found that this helps also. Just letting you know things that worked for me. Also, is your bov and mbc tuned properly?

I am only running the top nipple right now. And the MBC lines are only about 6-8inch long. I think I have it tuned right, I just played with it, untill it hit 15psi, which it does, but then it droppes off. I know this can be common with the T25, but when I had the stock setup there was no drop at all, boosted to 15, and stayed there....

 

[Bjeezy01]

Also, I don't know if this helps any, but in low gears(1st-3rd) it drops off to around 11psi, but in 4th and 5th it only drops to about 13psi...