Installed intake, boost trouble... help!

[Acuracy]

Ok, so I got the intake installed fine but now i'm having trouble setting the boost. I have the line going from the hot piping to the boost controller then the boost controller to the wastegate actuator(like in picture in instructions). I can set it all the way open or closed and it just stays at stock boost. Just out of desperation I tried putting the boost controller on backwards and if I unscrew it all the way it stays at stock but if I tighten it all the way it will spike up high(it went to 12 and was still going but I let off) then one click lower it went to 11 like I wanted then fell back down to 8.5 in 3rd then in 4th went close to 12 then dropped down to around under 7. Stock is 8.5 btw

Help?? :confused:

[96ekhatch]

Well sound fine when installed backwords. Is that turbo big enough to hold 12psi. Maybe you got a bad boost controller. What kind of psi were you going for??

[Acuracy]

People hold 13 and 14psi with the stock turbo, I was hitting 11 and dropping to 9ish with I was running just cone filter, now it's all screwed up. The stock intake has a bung for an additional line coming from the boost controller, since the new one doesn't have it it takes that line out of the equation. I can't get mine to work right. Do you think the boost controller could be bad even though I was hitting 11 and dropping to 9(which I assumed was due to lack of air from the stock intake being so restrictive)? I could change it at will easily.

[spicychicken014]

Is it one of those no name manual boost controllers? If it is buy another one and try your luck. My first boost controller was bad and i was spiking all over the place.... If that doesnt work i can meet with you and take a look at it.

[96ekhatch]

I mean its worth a try. I dont see why changing intakes would throw you off that much though. Is it an internal wastegate?? Is it a budget boost controller or a legit one?

[Acuracy]

Thanks spicy, I might try disassembling it and reassembling it to make sure nothing is caught up too.

The intake change shouldn't be/isn't really a big deal, I had to change the entire setup of the MBC but i'm certain i've got it right. The more i read and think about it the more it sounds like my MBC is bad :/

[96ekhatch]

yeah sounds like it to me. Honestly just get like a hallman bc they are pretty cheap and work great. I got one and love it.

[pdexta]

Awww man, I thought you guys said all MBCs were created equal. I bought a super cheap one a few days ago. Fail. :rofl1:

[Acuracy]

Well I could change it for higher or lower boost but I came to the conclusion that I couldn't hold boost because the intake was too restrictive, maybe it was partially that my mbc wasn't working 100% too. Who knows, yours may work fine :/

[2k8OBEVOX]

what MBC do you got??

[Acuracy]

http://i407.photobucket.com/albums/pp159/lateralspeed/MBC1.jpg
http://i407.photobucket.com/albums/pp159/lateralspeed/MBC2.jpg

Just snapped a quick pic this morning.

I also installed it this way:
http://i407.photobucket.com/albums/pp159/lateralspeed/FMIntake.jpg
I could hit whatever psi I want but it would drop back down to 9ish by redline just like before the intake. There are people holding 14psi on the same turbo and intake.

[03scgt]

can they hold that same psi to redline or does it just spike then taper down? check the recirc valve it could be leaking and also check all you connections.if you cant find a problem with any of that then its the mbc

[Acuracy]

They hold the same psi to redline. How do I know if it's the recirc valve that's leaking? I've read that it would be kinda bumpy like it'll hit full boost then drop then hold then drop as the valve tries to maintain the psi, is that true? Mine is a steady drop from whatever I set it to spike at down close to stock boost. I'll recheck all the connections but i'm pretty sure they're good.

[03scgt]

They hold the same psi to redline. How do I know if it's the recirc valve that's leaking? I've read that it would be kinda bumpy like it'll hit full boost then drop then hold then drop as the valve tries to maintain the psi, is that true? Mine is a steady drop from whatever I set it to spike at down close to stock boost. I'll recheck all the connections but i'm pretty sure they're good.


depends on how its leaking.alot of times it can just drop boost slowly without you noticing it or it could have a tear in it and be bumpy.look up homemade boost controllers on google and go to home depot to make one.itll cost like 3$ and you beable to find out if thats the problem or not

[dscivicdx]

where does your boost controller read from?

[96ekhatch]

the hotside pipe...

[Acuracy]

Yup ^

[himsx]

If it's to much work try putting the old intake back on and seeing whats up

[Acuracy]

Hmm... well I took it apart and there is no spring or ball in it...? Does that make it a bleeder type? Anyway, I know that the small blue T in the 3rd picture can have a spring and ball in it, it doesn't right now. I'll try putting them in, does anyone know where I can get a small short spring and ball that will fit in it?

[Acuracy]

I see j00 lerkin in here jew man...

[Victor]

Throw away that BC and buy a real man BC like an HKS EVC 5. (Ok not really but I wanted to give a typical Supra owner answer lol)

See if anyone else has another manual BC you can try before you go buying a new one.

[2k8OBEVOX]

arnt MBC supposed to have a spring and ball???

thats strange..

[dscivicdx]

nm.... cold medicine is messing up my reading comprehension.

[Acuracy]

Throw away that BC and buy a real man BC like an HKS EVC 5. (Ok not really but I wanted to give a typical Supra owner answer lol)

See if anyone else has another manual BC you can try before you go buying a new one.

lol. good idea, i'll see if anyone around here has one I could borrow for a day.

arnt MBC supposed to have a spring and ball???

thats strange..

Yea, from what I read it's a bleeder type. It basically bleeds air instead of using a ball and spring so you set the screw where you want and it only lets that much in. I'm gonna see if I can set it precise enough to maintain about 10-11psi. It may just not be able to do exactly what I want it to though so I might have to order a FM MBC :(

[Sloww]

wastegates :SolidStraight:

[96ekhatch]

Its the boost controller. I got a hallman you can try but i live in lehigh. You shouldnt need that other tee. You should be able to come off pipe to bc to wga. I say you need a legit boost controller. Like i said i got one you can try but sorry you cant keep its already got a home...

[Acuracy]

Its the boost controller. I got a hallman you can try but i live in lehigh. You shouldnt need that other tee. You should be able to come off pipe to bc to wga. I say you need a legit boost controller. Like i said i got one you can try but sorry you cant keep its already got a home...

lol it's cool man, thanks man. Are you gonna be out at a meet any time soon, if so we could swap it real quick take it for a run then swap it back. I would really like to make sure that's what it is before I spend the cash on one :thumbup:

[96ekhatch]

i havent been to a meet in like 3 years,lol. ill try to make it out this weekend, if you havent fixed it by then. my car may be down though

[stevieg]

i didn't read all the post but i had the same BC run the lower line on the BC to the wastegate and the upper line to the intake manifold.your not getting the right amount of vacuum for the BC on the intake pipe the best place is the intake manifold also get longer line and put the controller in the car makes life so much easier.

[dscivicdx]

i didn't read all the post but i had the same BC run the lower line on the BC to the wastegate and the upper line to the intake manifold.your not getting the right amount of vacuum for the BC on the intake pipe the best place is the intake manifold also get longer line and put the controller in the car makes life so much easier.

that was what i was thinking also, but i was having a hard time spitting it out due to the nyquil that i took earlier. its just weird that everything was working fine before the intake.

do you think the ecu is pulling timing?

[Acuracy]

Well no I had a very similar problem before the intake too(when I was running just a cone filter). I assumed it was due to lack of air from the really restrictive intake. I'll try running it back to next to the throttle body(where the stock one went) and see what that does but all MSM's with intakes run it off the hotside piping.

I put it back like the way it is in the 3rd picture since apparently that's the way a bleed style one is supposed to be setup. I'm hitting 11 and holding close to 10ish which is ok for now, I should be able to hold 11 all the way up though so I'll probably try from the throttle body linkup.

I appreciate the help/input guys!

[stevieg]

do u have a wideband?

try not to t-off any line to the BC, one line to the intake manifold and one line to the westgate. it makes a diff if you have 2 things on one line.

[Acuracy]

With a bleed type you have to set it up the way it because it doesn't actually go all the way through it then back to the wastegate, it works by not letting full pressure get to the wastegate by venting a tiny bit to air so the turbo holds boost more. This is the inherent flaw with it though, you'll always lose a little bit up top due to the way it works(i've been reading up on em non stop all day lol). I'll be buying a flyin miata BC soon so that will fix the little bit i'm losing up top now, but it's close i'm hitting 11 and holding close to 10 now. My lack of BC knowledge owned me when I bought the BC, if I knew it was a bleed type and what that meant I wouldn't have gotten this kind :/

And no, I don't have a wideband but I borrowed scotts and tested where the limit of safety is and that's 11 on my car. I should be running rich once i get the injectors cleaned and installed too so I may test again then and put it up to 12 depending.

[dscivicdx]

just as an example, when i first put my kit on, the waste gate was running off the compressor nozzle bung and i was hitting .5 bar and then it would fall off. then i got my vacuum manifold which runs off a large vacuum line hooked to the intake manifold and then i held a solid .5 bar.
there was a pressure variance from the compressor to the intake manifold and the waste gate was reading a higher boost pressure at the compressor, so it was opening up more, bleeding the boost off and lowering boost at the manifold.
when i finally get a new intake manifold, im going to tap it and run everything right off the manifold and get rid of my vacuum manifold.

[Pappy]

is your mbc in line with your stock electronic boost controller? In my car, it never holds boost to redline, it always tapers off towards redline. you dont want it too. high rpm and high boost is bad. are other miatas holding boost to redline?

[Acuracy]

No the stock EBC is removed, and yes other miatas hold boost all the way to redline. It's very common for MSM's to HOLD anywhere from 10psi to 14+(14+ only with aftermarket injectors though and almost always with engine management). I'll hold 11 once I get the flyin miata BC, dyno's have shown time and time again the a/f's stay fine holding that and I used scotts wideband to verify it was ok.

[Acuracy]

Took these with a phone and I don't know what the heck that noise is lol, but just so you guys can see. One is a 2nd gear pull(obviously the shorter one) and the other is a 3rd gear pull. This is with the MBC that AJ made and it's doing the same thing as the other boost controller. I checked my connecitons everywhere looking for a leak but couldn't find one(gonna do a leakdown test with Billy sometime soon, thanks Billy!)

http://www.youtube.com/watch?v=a8kFUSkPgSI
http://www.youtube.com/watch?v=GjwCPAVZZ6Q

WTF... it's clearly not the MBC so... anyone have any other suggestions :confused:

[03scgt]

lol the fucking noise is making me unable to watch the video.check the dv and see if its leaking though.

[titter]

Are you sure your boost gauge is working correctly?

[.]

Call me 239223 2048

[my_slo_srt]

i think the boost controller is bad.. thats ebay... i mean i have a turboxs one we can try on your car.. those are better ;)