Boost isn't Steady

[kwiktsi]

are there no options regarding the replacement of the stock WG's spring, to a stiffer one? i'm not familar with which turbos use the same wastegates.

You can possibly get a heavier one- my turbo guy said he could probably match one up, but he needs either a PN or my stock one to look at and I don't have a PN and I can't take my car apart, I need it .

the stock gate is adjustable, just a b**** to get off and do it. You will still have variations on boost though, just not quite as bad.
Joe

 

[low_psi]

You can possibly get a heavier one- my turbo guy said he could probably match one up, but he needs either a PN or my stock one to look at and I don't have a PN and I can't take my car apart, I need it .

the stock gate is adjustable, just a b**** to get off and do it. You will still have variations on boost though, just not quite as bad.
Joe

yes, those options kind of kill the idea for me, spud needs his car running everyday... i'm sure he doesn't want to leave it with me for the night to tinker with

what would you change in the stock WG though? there a way to make the spring tighter(stiffer), i'm guessing?

 

[kwiktsi]

yes, those options kind of kill the idea for me, spud needs his car running everyday... i'm sure he doesn't want to leave it with me for the night to tinker with

what would you change in the stock WG though? there a way to make the spring tighter(stiffer), i'm guessing?

The stock rod is adjustable (threaded), so you just tighten/shorten it. The thing is if you do that, it will increase boost and if you bring it in for any type of work where they check for psi, you will get nailed for tampering with it.
Joe

 

[Brian MP5T]

Re: Re: Re: Varing Boost

Well said..

Nice car BTW. How's it run ? Any #'s on it?
Joe

I Just got it together a week ago. The Turbo is brand new and I wanted to give it a rest and fine tune the fuel management system before seeing what it will do under " Adverse Throttle Position " I'll keep you posted. Later

 

[brennan]

Ok, for people who have the mbc, how many threads do you guys have left on your knob? to sit at 9.5psi, I'm just wondering, Also how high does this joep mbc boost to? 20psi or 30psi? again just wonderin

 

[perfworks]

Hey Perfworks,

Where does one buy this Bosch recirculating valve? I went to the Bosch web site, and could find no such animal.

Thanks.

We are a direct distributor for them. You can contact me thru email and we can send it to you. I believe they are $58 + shipping. They are a great upgrade. I use it now and i run well over 13-14 psi on a T3T4 right now. We use them all the time for up to 20psi on much larger turbos with no leak. You should really look into it. At our last meet here in NJ A new member bought one and is very satisfied.

 

[low_psi]

Ok, for people who have the mbc, how many threads do you guys have left on your knob? to sit at 9.5psi, I'm just wondering, Also how high does this joep mbc boost to? 20psi or 30psi? again just wonderin

joe- the spring adjusts exactly how i thought. since its adjustable, you can always just re-adjust it back down to stock

brennan- when spud gets back, i'll look at his for you. my suggestion is that you keep it threaded OUT, and slowy thread it in after checking the boost. when we installed it on my friend's gst, we hit 2bar the first run we shat ourselves...

 

[unwrittenLaw]

I wanted to bump this, because I'm interested to see if anyone else has adjusted their wastegate spring...

 

[t3ase]

I've been thinking about trying it but Joe told me it was a total pain in the ass to do.

 

[unwrittenLaw]

Yeah, well I'm curious because I think since I took mine into the dealer about a cel, they did something to the wastegate, because I put my mbc back in a week later and can not get past stock boost, no matter how much I turn the screw in on the mbc...They didnt tell me they did anything, but I dont trust them...its pissin me off..

 

[t3ase]

Here's some info from our PMs.. (read from bottom up)

quote:
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kwiktsi wrote:
Under the exhaust manifold. Adjusting it is the right way to do it (although Mazda won't like either ), but bending it is how I did it after I got pissed trying to adjust it. If you look at the wastegate actuator, you will see that the rod coming off it is adjustable- loosen the lock nut and thread it in (clockwise about 2 full turns to start. I don't know if you can get it better from underneath the car or not, I know it looked like I had to pull the damn turbo to do it right .
Joe


quote:
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t3ase wrote:
What, bending it or adjusting it? I should be fine adjusting it.. So, I'd want to look at the intake manifold (from under the car?) and find a lock nut. Loosen the nut and what exactly do I tighten once that's loose?


quote:
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kwiktsi wrote:
The rod on it is adjustable- it is a b**** to do though. If you look down under the manifold, you will see a lock nut on it, you need to loosen this and tighten the rod. If you can't get it, you can get pissed off and bend it like I did . But that will end the warranty since it will be kind of noticeable .
Joe

quote:
--------------------------------------------------------------------------------
t3ase wrote:
How'd you tighten the wastegate? I thought the discussion was that we had an internal wastegate which was not adjustable.

 

[t3ase]

Hope that helps ya

 

[unwrittenLaw]

Thanks for the info...see I dont want to mess with the wastegate if its something that the dealer is going to be able to notice... I mean if they gonna b**** about me removing the weatherstripping and putting a K&N filter on...I can only imagine what they'd do if they saw the wastegate being messed around with...man this blows...I put in colder plugs so I could run higher boost, and now I'm stuck at stock boost...

 

[t3ase]

Did you check all of the connections and stuff?

 

[unwrittenLaw]

Yeah, everything looks normal...but I cant see the wastegate very well and wouldnt really know what to look for down around there..but all the vacuum lines look normal from what i can tell. The line from the T down to the wastegate is that hard plastic crap and its starting to crack, but the cracks arent deep enough to be leaking I dont think..I hold steady boost, it just wont increase with the mbc in there...

 

[t3ase]

If you really can't figure it out, I'd drop another $45 to Joe or email him and see if he can send you one out for free just to try and make sure it's not the MBC.

Edit: I wouldn't think that there was something physically that the dealership could change so it ONLY handles up to 6.9psi of boost or whatever you said you were pushin'

 

[unwrittenLaw]

Yeah I was thinking that, but it worked fine before when I was using it and I blew through it before I put it on and checked it, seemed good...I dunno, its just strange how it runs fine and holds stock boost very well...better than before I took it in...
It seems that since the dealer thought the cel was from a "boost concern" as they put in the invoice, that they adjusted the wastegate to where it wont take more than normal boost...wish they would've told me what the heck they were doing to my car, instead of trying to be all secretive on me like I did something wrong...I guess I'll take out the mbc and check it....