Boost help!!!!

[breakdancnkid26]

So my brother just bought a 03 MSP with 28,000 miles on it. A few weeks after he bought it he said it feels like the turbo isn't working. I installed a boost gauge and turbo xs manual boost controller. I'm pretty sure they are both hooked up correctly. I t'd the boost gauge off the vac line off the top of the intake manifold. And the MBC is also t'd off the same vac line and the wastegate line. With the bottom of the MBC going to the wastegate line. But his boost gauge reads nothing. With the MBC all the way turned down I turned it up 1/4 of a turn. And still nothing at all. Anyone have any solutions? I read that the wastegates in these cars go bad pretty easily? Maybe I have something hooked up wrong? He's been driving it and it drives fine just no boost. Turbo isn't grinding or making any noise or anything. If more info is needed let me know. I can get pictures of whatever is needed. It also looks like his turbo is leaking oil. I'm hoping it's not a bad turbo but it's looking like it. Thanks for the help!!!

Ryan

 

[BOOSTR]

1/4 turn from your base boost psi won't do much. TXS's adjust by turning it counter clockwise. One to Two complete turns is a good place to start and then test it in 3rd gear to see where it settles and then adjust it from there.

I have mine attached to the hose "T" which is in the original factory line that the BPV also uses. My boost gauge is T'd into another line at the back of the manifold. Also make sure that its mounted in the right direction with the stamped arrow pointing towards the pressure supply versus the firewall.

So I would say that you have yours wrong by sharing the same hose, if I understand your setup.

Vac should be in the -20-22 hg/in range at idle. My original wastegate still works flawlessly.

Where is the oil leak at on the turbo?

 

[breakdancnkid26]

I had the boost gauge t'd off that the small U-shaped vacuum line in the back of the manifold. Is that where you had your's? Also I have the MBC t'd off the same vacuum off that runs to the BPV and the other line runs to the wastegate. The wastegate line runs to the bottom of the MBC and the other line runs to a T on the BPV vacuum line. So I should turn it 1-2 full turns then test it?? I just didn't want to blow the motor knowing they only run like 6ish lbs from the factory.

Thanks,
Ryan

 

[mazdaspeedp]

Sounds like maybe your wastegate is stuck closed.

 

[breakdancnkid26]

Sounds like maybe your wastegate is stuck closed.

Can this be tested? If so how?

 

[mazdaspeedp]

i think theres somesort of blow through test where you blow through the vacume line on the wastegate and if its hard to blow through than its stuck

 

[hornsfan10609]

It actualy sounds like the WGA is stuck open or torn if it isn't boosting at all. Blow into the vac line to the wga, if any air passes through it needs to be replaced.

 

[BOOSTR]

OK then you have it hooked up right. The psi is all over the place due to the ajustable WGA rod from the factory. Some people had less and some more. 1-2 turns won't raise it that much. My psi is 6.9 stock. I have their DSBC and currently run 10 psi for the 2nd stage.

Something else you might want to check is the WG flap at the turbo, it may not be closing and sealing fully. Their have been some post with that problem.

I had the boost gauge t'd off that the small U-shaped vacuum line in the back of the manifold. Is that where you had your's? Also I have the MBC t'd off the same vacuum off that runs to the BPV and the other line runs to the wastegate. The wastegate line runs to the bottom of the MBC and the other line runs to a T on the BPV vacuum line. So I should turn it 1-2 full turns then test it?? I just didn't want to blow the motor knowing they only run like 6ish lbs from the factory.

Thanks,
Ryan

 

[breakdancnkid26]

Ok, so we finally got the car up and running. Thanks to a member on here we were able to pick up a brand new stock turbo and low mileage replacement motor. Installed everything and the car runs fine. Except I don't think the turbo is boosting at all. When you rev the motor up I don't hear any spooling or anything coming out of the turbo. I turned the MBC counter clockwise two full turns and I can hear what seems like air leaking out of the MBC.(Brand new TurboXS MBC but could it be bad?) I'm going to take pics of how the MBC and the boost gauge are hooked up. I'd really appreciate any help on this!

 

[2.0t03speed]

Ok first not to be rude or anything but do you know anything about turbo cars? The turbo doesn't make boost by just revving up the motor you have to actually drive it and put load on it. The turbo xs mbc is a bleed type valve iirc so the more you turn it the more it bleeds of pressure from the wastegate that way the wastegate will stay shut longer allowing you to build more boost.

 

[breakdancnkid26]

I do but I'm obviously no expert and I meant while driving it I was letting the motor rev up before shifting. Sorry should have been more detailed. Also here is the link to the other thread that has the pictures of how the MBC and boost gauge are hooked up.
http://www.mazdas247.com/forum/showthread.php?123798433-Boost-help!!!

 

[2.0t03speed]

is the boost gauge reading anything while wot?

 

[2.0t03speed]

also what mods does the car have

 

[breakdancnkid26]

Car is bone stock and it just a boost gauge so I cant see if there is any vacuum. But as of right now no the car isn't reading any boost. And I do appreciate the info on the turboXS MBC.

 

[breakdancnkid26]

I have read quite a bit about these motors and how they can't handle much boost in stock form. And since he already threw a rod once on stock turbo and boost at 28k miles I don't want to push this one. I'm just trying to get the turbo to run stock boost.

 

[2.0t03speed]

you won't hear the turbo spool with a stock airbox and plastic pipes. Is the wastegate arm hooked up? Can you verify its working?

 

[2.0t03speed]

ehh its all in how you drive the car and what your mods are I ran a 28rs for over 10k miles at 10psi with no issues. Now I'm going to be throwing on a 2871r on the stock motor

 

[breakdancnkid26]

you won't hear the turbo spool with a stock airbox and plastic pipes. Is the wastegate arm hooked up? Can you verify its working?

I did check to make sure the arm was hooked up and it is. As for verifying it's working how would I go about doing that? I really appreciate your help.

 

[breakdancnkid26]

My brother just wants to run a safe amount of boost for now. He plans on just doing a few bolt ons such as intake, exhaust, and possibly either a upgraded stock intercooler with hard pipes or full FMIC. It's his daily driver so he's not looking to put a ton of money into it. So would 7 psi be to much boost on a completely stock motor?

 

[2.0t03speed]

7psi is stock boost so that will be fine. If he does simple boltons he can run 10psi allday. Don't be scared By the naysayers. Just don't constantly beat on it and get a wideband and the car will last a good while. To verify if the wastegate is working get a air compressor with a regulator on it and set it to say 10 psi. Then shoot it into the wastegate line and see if the arm actuates. Also do you have any exhaust leaks before the turbo?