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Discussion Starter · #1 ·
What boost levels were you guys achieving on a bone stock truck similar to mine. Right now with my new gauge installed under WOT it does not even reach 5psi, for about 10-12 seconds it got to about 4 but not higher. Maybe if I stay on it longer it will make 5, but I don't know. How much boost were you guys experiencing on your stock trucks?

Thanks, Jacob
 

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It varies quite a bit.

Mine was getting around 9 to 10 wide open. With the exhaust mods and K&N air filter it would hit 11 to 12 wide open. Same as it does with the turbo master. However with the stock boost control it would not hold much boost.

Now I have my turbo master turned up a bit and at 70 I am seeing around 5
 

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Mine would spike to 10psi momentarily and then settle in to about 7 at full throttle. This was seen with a 4" exhaust and K&N filter. After reflash, it will spike to 15 and settle to about 12 at full throttle.
 

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Discussion Starter · #4 ·
Mine doesn't even reach 5psi under 10seconds of WOT.

Jacob
 

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i'll spike to about 14 for a second or to then drop to 8 hold there for a little then gradually taper off until redline but if that boost gauge you jsut installed happens to be the boost and vaccum gauge plug it into your vaccum pump line and see how much vaccum you've got or see if you can push down the wastegate "you shouldnt " but thats a good place to start i've got 25 pounds of vaccum when i stuck my autometer gauge into the vaccum line
 

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Discussion Starter · #6 ·
No this is just the boost gauge. What are you saing about pushing down the wastegate?

Thanks, Jacob
 

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You can get a vacuum gauge at the parts house. If you are going to keep the stock boost setup you need one.

25"HG at the line coming from the pump. 15"HG at the line to the turbo.
 

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the vaccum line that runs to the turbo it sucks up a rod and that rod is connected to the waste gate on the turbo the arm should be flat when the trucks running try removing the vaccum line to the turbo once and observe how the arm drops(points at a downward angle). well when the vaccum lines hooked up at idle you should not be able to move that arm from the up posistion
 

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Discussion Starter · #9 ·
O.K. I understand. I am going to be making a turbo master and setting it to spike to 10psi anyways so I don't think it much matters in the short amount of time between now and the time I do make it. Is 10psi pretty much the highest you want to go on a bone stock 6.5? When I do make the turbo master, all I need to plug is the line going to the turbo(that can mounted on the turbo that operates the wastegate) right?

Thanks, Jacob
 

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You need to monitor the EGT's and boost and you should be OK. 12 psi is not going to hurt it as long as the EGT's are not too high.

Some people say 1125 is the max EGT. Some go for less. I keep my boost below 12psi and EGT below 1000F.


With the turbo master tight it will boost up over 14psi. I try to not push the pedal too hard when it goes over 12psi. Having it tighter makes it do better at low boost levels. Gets rid of the haze of unburnt fuel on acceleration.
 

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mine is 18-20 stock and around 30 with the boost valve :)
 

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Mine runs about 45 or so abnormally. :)
 

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Discussion Starter · #13 ·
So if I monitor, I can run it so that it peaks around 10-12psi at WOT and probably under heavy load.

Jacob
 

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It will go higher under heavy load.

Mainly due to more heat energy to power the turbine side of the turbo.


Watch your gauges and after a while you will be able to drive in the sweet spot without much effort.
 

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Mine was exhibiting the exact same symptoms. Typically mine would spike to 13 drop to 10 then settle around 8. When my vacuum pump went south that is what I saw. I was hauling a car over the sierra's at the time and had to slow way down as my temps were getting higher than normal. Checked the vacuum which was barely anything so I replaced the pump. After that everything worked fine.
 

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Discussion Starter · #16 ·
Right now I dont know what my problem is, I can only get 5psi with vac system. Maybe exhaust isn't helping. Plugged cat maybe, exhaust leak, I don't know right now. I am in problem finding mode right now.

Jacob
 

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Through a collaborative effort of your friendly 6.5 staff a rather descriptive synopsis of how the 6.5 turbo system works can be found in the FAQ sticky, which takes you here http://dieselplace.com/forum/showthread.php?t=39368.

Go through it before giving up all hope, I doubt your turbo problem is as difficult as you imagine, but to fix it you have to do you homework assignments presented above.

Guys/gals I know us mods sound like broken records on the use of the FAQ, but they are there for your benefit there is a lot of great info within them, site veterans please direct the new members there first before jumping up and answering the questions, if you know the material exists but can't remember where PM one of the mods we will be more than willing to help you find it.

Yes FAQs are not ideal and need some tweaking we realize that, point it out in PM to us what changes for the better you desire, if we don't get back to you it is not an implication your idea is a bad one, we may just have not gottin to it, or have gotten overcome by life's everday progress and have forgotten it. If you don't hear from us ask again, also use the multi address feature put all mods on copy, one of us should get back to you, we converse behind scenes often enough one of us will clue in the other one, that somebody here has a question.

There are a lot of members here now to keep happy, so we will have to temper what we do as something that benefits the whole, that said don't say how dumb an idea is as happened last week with a request to consider the sticky name change.

Obviously consensus was a no change vote, fine which is why I asked on behalf of a few others, but I was somewhat disappointed at the blood lust & frenzy that came about with a simple question; and how dumb the idea was we are better than that. Forum will only improve if we don't stiffle enthusiasm to make changes, there may be a good reason to not change we can share that reason without attacking the idea or person/s asking it.
 

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Discussion Starter · #18 ·
I have read this, and I have come to the conclusion that it is prob my soot trap. I will first try and get a mechanical spring actuated system going before I tackel the project of taking the cat off. If the spring mechanism does not do anything then I will know it probably has something to do with the exhaust right? If I tighten down on the spring as much as possible so that the wastegate can't open then I will be able to find out if it is my exhaust or not. For about 5bucks to make a mechanical wastegate it is deffinately worth it to see if that is the problem.

Am I right, thanks, Jacob
 
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