Boost issue

[josh408]

So here's the deal. I switched from a mbc back to a stock BCS with a restrictor in the line that goes to my intercooler pipe so I would be able to regulate boost through the feature in link V3. On the mbc I was running 18psi but when I switched over to BCS I'm stuck at 10psi and creeps to 15psi. Its an mhi evo 3 16G turbo with a fp side mound and hard piping all around with a 1G blow off valve. I've boost leak tested it. So far found no leaks other than the slight amount of air that gets into the crank case. The stock restrictor has be removed from the BCS I'm using a brass tee. The boost tables are set to 100 percent yet still 10psi. What could this be?


http://www.youtube.com/watch?v=Pq9YegIoby0&feature=youtube_gdata_player

 

[Spanky_DSM]

did you hook up the T from the intake to the wastegate?

I would also recirculate the air from the crankcase pressure back into the intake if it isnt already

 

[josh408]

I believe top port of the BCS is hooked up to the snorkel and bottom his hooked up to a T. 1 end goes to the waste gate and the other end with the restrictor goes to the nipple on my intercooler pipe. I'm running a non circulated oil catch can but plan on capping off the breather filter I have on it a running another line back to the intake tube

 

[josh408]

So anyone else?

 

[josh408]

I'm stumped. I recirculated my oil catch can. Installed a check valve between the line that connects my PCV to the intake manifold. And still sound is still there. Time to do another boost leak test.

 

[TimeWillTell]

I heard a similar whistling noise before and it was deceiving. I did a boost leak test and found no leaks... drove it again and heard the noise... boost leak tested again and started fiddling with clamps and what not. I moved the throttle body springs and there it was... bad throttle body shaft seals. I had to move it in order to hear the leak. Not sure if that's your problem but it's worth a look next time you boost leak test.

 

[josh408]

I'll have to check that out. Thanks

 

[josh408]

I heard a similar whistling noise before and it was deceiving. I did a boost leak test and found no leaks... drove it again and heard the noise... boost leak tested again and started fiddling with clamps and what not. I moved the throttle body springs and there it was... bad throttle body shaft seals. I had to move it in order to hear the leak. Not sure if that's your problem but it's worth a look next time you boost leak test.

You sir, hit the nail on the head with this one. I put the tester on the throttle body elbow and moved the spring, there it was hissing. I made a video but you can't here the hissing in the video because of some noise outside. But thanks man!

 

[clipto]

You need to do the boost leak on the mouth of the turbo. The stock bsc is just a restricted your not gonna get good boost put of not. Try a good 3 port ebc with a map sensor if you wanna do it right boost by gears.

 

[josh408]

It's been done the way I'm doing it to regulate boost through link v3. I took out the stock restrictor and added a restrictor in one of the nipples that go to the nipple on my intercooler pipe.

 

[josh408]

Boost leak fixed. Here are my old seals and I installed mil.spec seals.

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[Efalcon]

This is related to my boost, but not to this specific issue. Hope you don't mind.

My boost kicks in at 5k rpm. Set from prev owner.
I was thinking like 3,000-3,500 would be better. How would you adjust that?

This is related to my boost, but not to this specific issue. Hope you don't mind.

My boost kicks in at 5k rpm. Set from prev owner.
I was thinking like 3,000-3,500 would be better. How would you adjust that?

Also my turbo is after market and prev owner set it like that

 

[josh408]

Doesn't make sense. What are your mods?

 

[Efalcon]

As far as I know. Garrett turbo, intake, wastegate.

You can check out my pics. Can't post on app.

 

[josh408]

As far as I know. Garrett turbo, intake, wastegate.

You can check out my pics. Can't post on app.

No front mount? And what the heck is that razo thing in your glove compartment? I don't think I've ever seen that but it says RPM and stuff on it so that might control it. From what I seen there's no reason you should be barely spooling at 5k rpm you even have an external o2 dump on that. Best thing I can say is tinker with that razo thing.

 

[Breezio69]

I think that's an old school turbo timer ^^^ the "razo" thing you speak of... but I could be mistaken.

 

[Efalcon]

Lol bro you got me. The prev owner didn't even know. I tried looking it up to couldn't find anything. Ya that is what I was thinking. He said he disconnected it, but the light still comes on Above my intake there is a little box that says pro. He said they were related.

Ya I just got the car so I haven't had a chance to front mount it.

What have you done with your car so far?

Okay it's a shift light.

Did further digging.
It's suppose to come with lights you mount somewhere on you dash or in front of steering wheel.

 

[josh408]

Mods I've done are in my mods list. But I think that's what's controlling your Rpm. It's really the only thing I notice that really different. Because if you had that big of a boost leak your car wouldn't even start let alone drive. I asked if it had a front mount installed because that usually doesn't get full boost until about 4k rpm-ish

 

[Breezio69]

Turbo lag? Vac leak at bcs or boost controller or in any of those lines. Highly doubt its anything related to the box in the glove box.

 

[Efalcon]

Maybe that's what it is. Because when I put my foot down I hear it spooling low to mid 4k maybe It doesn't get full boost till 5k so then I really hear it.

Ill check them out I can really look at anything since I am on my iPhone app

 

[josh408]

I'm using the iPhone app, just touch the persons avatar picture and it'll take you to there profile. Turbo lag could be a reason but 5K rpm with no front mount which means its running to a side mount is still high to me

 

[Breezio69]

how high of boost are you running? how large is the turbo? I know its a garrett but there is such a thing as turbos being too big for a car.

Im still going to go with boost leaks or somethings not right with the hose routing for the wastegate/ bov/everything.

I looked through your pics again, there wasnt really any that told a story, since they all seemed to be of the intake /turbo area. The two pics that caught my eye were the turbo outlet, worm drive clamp is a no no. The only real success ive had with worm drives on intercooler piping or post turbo piping is doubling them up, with one directly over the flange and another on the pipe, or in this case on the turbo... or just spend the $3 on a t clamp.

The other photo I couldnt really figure out is I believe your last one, the crappy quality one

It appears a vac line goes from the wastegate to the blue mbc, then one from the turbo comes off and you cant really see whats going on... the radiator hose is in the way, and something comes off in a loop from that area as well and goes out of frame to the left. Either way, that seems like 1 too many lines in the area. If other vac sources are tee'd into the mbc line then it can affect how the mbc works, which is the signal for opening and closing the wastegate.

 

[josh408]

I'm going to have to thread jack my own thread. so the my throttle shaft seals weren't the problem (well they were a problem but not the one I was trying to solve). The sound is still there and I'm just stumped now.

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Here are the mil.spec seals installed. And I replaced all the gaskets fiav, biss, oring. Etc any help please?

 

[josh408]

Anyone? Any ideas?

 

[josh408]

No one at all?