Do i have to have a MBC if i upgrade my UICP & BOV?

[kmoore]

Hey guys, i am just about ready to purchase my dejon uicp's and greddy type RS BOV. But, i have heard that after installing these things you may infact have uncontrollable boosting. Like, you may be boosting above stock boost levels (10-11 psi). Is this true? And to control this you have to buy a MBC. If i absolutely HAVE to buy a MBC i will, because they aren't that much. But, if i can SAFELY get away without buying one i would like to not buy one (Money is a little tight right now.) What kind of MBC do you recommend also, because in the future i will more then likely buy one? Also, one other question, on the gasket for the uicp gasket (where the upper intercooler flange bolts up to the intake manifold) should i put some rtv on the gasket to keep it from leaking? Thanks

 

[ILLiCliPSE]

I am doin the same thing....Dejon UICP w/ the RS bov...

I know this reply doesnt help at all, but Id like to know also.

It might decrease boost leaks (its one long pipe right?), which in the end means getting the boost back that you were loosing. But if anything, I dont think it'd raise the boost enough to be dangerous.

 

[zachakagoat]

No you won't need a MBC if you get the UICP and BOV, I would even recommend doing the bcs restrictor mod because a stock gst can handle 15psi easy on the T25. www.vfaq.com is your friend

 

[GloriousDSM]

do you have an aftermarket boost gauge yet ??

if so then install the parts and keep it on the stock boost selenoid, your turbo response time will be imporved by the UICP

"Also, one other question, on the gasket for the uicp gasket (where the upper intercooler flange bolts up to the intake manifold) should i put some rtv on the gasket to keep it from leaking? Thanks" you dont need any gasket sealer when you couple from the TB elbow, just use clamps and youll be just fine.

 

[b4christ15]

Make sure you have a boost gauge first before doing anything. As far as those mods go, a MBC isn't needed since an intake and UICP really shouldn't affect boost. However, I suggest picking one up anyway. Forced Performance has Joe P. MBC for like $40 or you can even make your own for cheaper. An uicp, intake, and mbc were my first real mods and I really noticed a difference in my car @ 15 psi. Enjoy

 

[kmoore]

Alright, thanks for the help. And yes i do have an aftermarket boost gauge. So with the uicp and bov, what kind of difference should i notice while driving my car after the install?

 

[95blackGsTurbo]

It will spool louder and the BOV will be louder and spool time will decrease with some power increase. It's one of those mods that you will appreciate more once you get more mods. As far as RTV goes I use it on everything but in small amounts. In this car I would just suggest cleaning both surfaces real good then using CopperCoat but if you want to use RTV that's fine too. Just put some on your finger and spread a thin layer on the elbow, put the gasket on then put a thin layer on the other side of the gasket. Basically so there is a thin film of RTV on it.

 

[kmoore]

Thanks a lot. Thats some good info right there

 

[MrBoxx]

you dont need any gasket sealer when you couple from the TB elbow, just use clamps and youll be just fine.

Dejon's pipes replace the throttle body elbow and flange directly to the throttle body. He even includes new bolts to replace the studs that currently hold the elbow and TB onto the IM. There's one problem with that, though: If you take out the studs to replace them with the bolts, the throttle body falls off. I learned that the hard way after getting three studs out and the throttle body twirled around.

I used a very small amount of RTV on the TB gaskets because I was re-using them. It should be fine as long as you don't get any that squishes out into the inside of the intake tract when you tighten the bolts.

You won't need an MBC for IC pipes and a new BOV. You may notice that your boost level rises due to the BOV not leaking boost, but it won't be drastic. I don't even remember an increase in boost when I installed my Dejon pipes/1g BOV without an MBC.

 

[B0OST]

If you get an MBC, u NEED an aftermarket boost gauge, i also recommend getting an air-fuel ratio gauge to make sure you dont run too rich or too lean

 

[MrBoxx]

i also recommend getting an air-fuel ratio gauge to make sure you dont run too rich or too lean

Absolutely worthless unless it's a wideband. The only GOOD use for a narrowband AF gauge is to make sure the O2 sensor is working correctly. Otherwise, it's just a blinky light show. Even my calibrated A/F gauge (.75v-1.0v as opposed to 0v-1.0v) is still pretty annoying.

 

[95blackGsTurbo]

Absolutely worthless unless it's a wideband. The only GOOD use for a narrowband AF gauge is to make sure the O2 sensor is working correctly. Otherwise, it's just a blinky light show. Even my calibrated A/F gauge (.75v-1.0v as opposed to 0v-1.0v) is still pretty annoying.

Yup...just a pretty light show for you to look at.

 

[kmoore]

Like i said before, i do have an aftermarket boost gauge. Also, about the falling off of the throttle body thing, is that hurting anything if it falls off? What's the big deal if the throttle body falls off? What should i do to prevent that? Thanks

 

[daren_p]

Like i said before, i do have an aftermarket boost gauge. Also, about the falling off of the throttle body thing, is that hurting anything if it falls off? What's the big deal if the throttle body falls off? What should i do to prevent that? Thanks

What exactly are you refering to asking about the falling off of the throttle body thing? No you don't need a MBC but you can pick up a JoeP IL for $45 shipped & since you already have a boost gauge its a good investment, you can turn up the boost abit on the tiny t25 (15-16psi) to get a nice power increase in the mid range (will still drop off in the upper rpms, this is just because the turbo it too small)

 

[kmoore]

Mr. Boxx said that when he took the bolts off of the throttle body the whole throtle body fell off.

 

[MrBoxx]

I wasn't thinking ahead when I installed my UIP. I started removing ALL the studs that hold the throttle body and TB elbow onto the manifold. If you do that, nothing holds the TB on and it seperates from the IM. It's not a problem, per se, but it is annoying to try to fish the new bolts through a new UIP flange, gasket, TB, gasket, and intake mani all by yourself.

My suggestions is to leave one stud intact to keep the throttle body and gaskets aligned. the throttle body still try to fall down, but if you have a friend hold it in place, it won't be that hard to keep everything in line. When the new intercooler pipe is in place and has the other three bolts through it, you can probably remove the stud and replace it with a bolt. The bottom rear bolt is one of the hardest to get to, I'll warn you. Good luck.

 

[EclipseTrbo420A]

A MBC will not allow you to lower boost beyond the stock setting, only raise it.