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Author Topic: Boost up in 20's and cant get it down.  (Read 3515 times)

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Offline 2point3turbo

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Boost up in 20's and cant get it down.
« on: April 28, 2007, 11:48:00 PM »
I have a new Merkur and dont want to ask the XR guys because they are not very bright. My boost wont get out of the 20's and I have tried everything. I put on a new WGA and reran all the vacuum lines. They are exactly as my Pinto and I cant seem to figure it out. What else can be wrong here? My gauges are good as well so that cant be it.
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Offline turbowagonman

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Re: Boost up in 20's and cant get it down.
« Reply #1 on: April 29, 2007, 02:20:33 AM »
First off, I can't understand why you want to lower your Boost but I know with a restrictive Exhaust your boost goes down when you free it up. I know with the Exhaust in my fist Turbo Pinto when I would get to the Track and take my "Exhaust Dump" out I would lose around 6-7 psi on my Boost Gage. So I used a "Brass Fish Tank Air Divider"  on the Vacume Line that goes to the WG that way I could create Restriction to the WG and I could use that as a Pressure Regulator. This was with an IHI not a T-3 such as on your Merkur. So what I'm saying is, you might have a restrictive muffler and that is the reason you have "Too Much Boost"  :what: , is there really such a thing?

turbowagonman
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Offline Srt

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Re: Boost up in 20's and cant get it down.
« Reply #2 on: April 29, 2007, 03:40:36 AM »
back in the "old" days less restriction meant more pressure.  unless you're wanting to reduce the boost for reasons of reliability or parts longevity i can't think of any reason why you wouldn't want "All boost.. all the time"
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Offline oldkayaker

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Re: Boost up in 20's and cant get it down.
« Reply #3 on: April 29, 2007, 07:07:57 AM »
I would suggest checking the pneumatic lines, hoses, and fittings to be open (not clogged) and not leaking (split hose).  Also checking operation of the waste gate with a hand pump may show something.
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Offline 2point3turbo

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Re: Boost up in 20's and cant get it down.
« Reply #4 on: April 29, 2007, 03:55:53 PM »
Thanks for all the help and responses. I have replaced all the hoses and took all connections off to make sure I had good flow. I did however just get the stock exhaust off last night and replace with 3" and Flowmaster so that may free up the boost a bit. I did think that the old setup was clogged a bit. I will let you all know the results.
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Offline 2point3turbo

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Re: Boost up in 20's and cant get it down.
« Reply #5 on: April 29, 2007, 08:13:55 PM »
No change except that it spools faster and boosts more now. I have replaced all hoses and even went to a single out on the housing straight to the WGA. I am lost. It is an Air Research not a Garrett. I might just have to replace the turbo and go from there.
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Offline CHEAPRACER

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Re: Boost up in 20's and cant get it down.
« Reply #6 on: April 29, 2007, 10:13:12 PM »
Disconnect the waste gate rod from the valve completly, if you can't pull boost after that, then you know that it's the problem. Is it hitting your inner fender?  The engine will tip slightly to that side under load so make sure you have plenty of clearance.
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Offline turbowagonman

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Re: Boost up in 20's and cant get it down.
« Reply #7 on: April 30, 2007, 04:30:36 PM »
Quote from: CHEAPRACER on April 29, 2007, 10:13:12 PM
Disconnect the waste gate rod from the valve completly, if you can't pull boost after that, then you know that it's the problem. Is it hitting your inner fender?  The engine will tip slightly to that side under load so make sure you have plenty of clearance.

But wont that be "Uncontrolled Boost"? The WG is what Regulates how much boost there is untill it moves the WG open. So if you disconnect the Rod from the Actuator wont it just stay closed, just keeping the boost climing?

Can't you just put a Weaker Spring in the WG Actuator? That would mean the WG would open earlier, giving less Boost.

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Offline 2point3turbo

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Re: Boost up in 20's and cant get it down.
« Reply #8 on: April 30, 2007, 08:25:32 PM »
I will try and disconnect the WGA and see what happens. I already put on a new WGA that I know works so it shouldnt be that. The turbo has lots of room in the XR so that cant be it. I will try the disconnect and let you all know. I have never had this problem before... its frustrating! :wow:
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Offline 2point3turbo

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Re: Boost up in 20's and cant get it down.
« Reply #9 on: April 30, 2007, 08:47:12 PM »
I disconnected the WGA and got no boost so it must be that.
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Offline CHEAPRACER

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Re: Boost up in 20's and cant get it down.
« Reply #10 on: April 30, 2007, 09:46:42 PM »
Quote from: turbowagonman on April 30, 2007, 04:30:36 PM
But wont that be "Uncontrolled Boost"? The WG is what Regulates how much boost there is untill it moves the WG open. So if you disconnect the Rod from the Actuator wont it just stay closed, just keeping the boost climing?

Can't you just put a Weaker Spring in the WG Actuator? That would mean the WG would open earlier, giving less Boost.

turbowagonman

Actually, it's the spring in the WGA that holds the valve closed. You may have a hole in the diaphragm letting boost to escape. Also hooking up the hoses incorrect to your boost controller and cold side housing will do the same thing...trust me. 

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Offline 2point3turbo

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Re: Boost up in 20's and cant get it down.
« Reply #11 on: April 30, 2007, 10:32:28 PM »
How are they supposed to go? I have always hooked them straight from the housing to the WGA. Never had a problem until now.
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Offline 77turbopinto

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Re: Boost up in 20's and cant get it down.
« Reply #12 on: May 01, 2007, 06:57:51 AM »
Yes, make sure you have the WGA hose hooked to the duct AFTER the turbo. (I am sure you do) If so, it is most likely a bad WGA, or it is binding. Do you have another, or have you tested it?

IHI, T-3?

My friend Paul dissconected his BCS and got 18PSI (T-3) all the time and ran it like that for years. An IHI will start to give up at that #.

It take a lot to get one to bind. I moved the WGA on Connie's car (IHI) because it would have hit the frame. It is now at a different angle with less mech. advantage and it is doing fine.

Bill
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Re: Boost up in 20's and cant get it down.
« Reply #13 on: May 01, 2007, 08:57:34 AM »
Hello 2point3turbo \,
 Try Russ at this website http://www.rapidogroup.com/
 COOL stuff at fair prices.
 From Pintony
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