I was just wondering, when does a bolt on evo9 (stock block) hit full boost? I hit full boost about 3400-3500ish (24psi) is that about normal? and its at 21 by 7500rpms. Because b4 my buschurracing intercooler i could of swore it hit boost faster but i could be wrong..Mods are in my sig..

thanks

 

It probably did hit boost faster before. With the larger intercooler, you're going to lose a little pressure. That's why when you read descriptions of larger fmic's, they say "only 1.5 psi pressure drop, or only 1psi pressure drop". Theoretically, I believe you will need to run a little more boost to achieve the same amount after the fmic. The point of upgrading is for more efficiency and support for more power.

Your car sounds about right for a bolt on evo 9. It's supposed to spool quick and hit full boost fast, then drop off towards the end.

 

i've noticed max load hit at about 3400-3500 rpms. i cant log boost yet so i'm thinking that the full boost translates to max load. i'm still on my stock fmic @~23psi

 

Do I have a boost leak or major boost spike? Last night I was driving around and boost was at 23 psi like my orignal post and today I was boosting around and the boost was right there, hit it again and boost hits 18 psi I'm thinking to my self what the heck so I turn My mbc all the way down and set it where I had it and it hits18 from 3000 to 5000 and shoots to 22 by 6000... I'm confused

 

Why MBC's suck.

 

I noticed the same thing when I upgraded my FMIC. Boost took longer to spool but hit harder. My but dyno told me I had better top end.

 

I never had a problem with my mbc til now, i'm going to take it apart and clean it. And the car does have better top end

 

ewwww mbc. Even with temperature change it will go crazy. I have had countless problems with MBC's. Lag, boost creep, slow boost reaction, partial throttle boost unstabilty, you name it...i could go on all day. Best thing to do, which i plan on doing asap is sell your mbc, buy a GM 3-port solenoid and tune it with a tactrix. No more worries after that my friend. Also your boost gauge could be off. Especially if it is mechanical. Do a couple logs and see what your really boosting at.

 

I took it apart and cleaned it and it hit 26 psi with ease but I need to get tuned asap the car feels sluggish after I switch gears

 

Yea, I hated my old MBC. There was always something going wrong. I found a Greddy E-01 and it's been working perfect since day 1.

 

It's just a little bit sluggish I think. If you adjust the actutor rod a bit you should be seeing 24# by 3200.

 

my hallman was screwed so i put a turboxs on and it hits 24psi in everygear if i WOT but if i punch it in 4 or 5th it'll hit 16 psi

 

Im having similiar problems with my buschur racing MBC. Ever since I installed it i've never been able to dial in a consistant boost level. My target is 1.4Bar (21psi), but it spikes well past 1.5Bar on my stock gauge, which is a major concern.

When I turn it down, it goes way down to 1.0Bar. I just can't seem to find the sweet spot. Any ideas? When you guys are cleaning them out, what are you using to re-lubricate it?

 

+1 Gm Solenoid

I have three tunes for different fuels all three boost levels are perfectly handled by the gm..Every time i change a map its at the right boost level already no B.S.

 

i havent ran into issue with my Forge Unos MBC (knock on wood). i've been running it for about 2 years now set at ~23psi

i do like the idea of the GM solenid. so i would like to change that eventually. i have nt had to relube/clean mine yet