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post #1 of 18 Old 01-07-2008, 09:55 PM Thread Starter
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boost ???s

SInce I installed my guages I have been monitoring my boost levels to see what I am pushing. When I got my chip they said it should push around 30-32 psi. Well I have yet to see over 20. Its hits 20 and just stops climbing. I have an ISSPRO guage and there fittings for it. Could I have a leak somewhere? What can I check to see? I was really expecting more out of it. I may hook up my buddies Hypertech instead for a day and see what it does but I was just curious.


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post #2 of 18 Old 01-07-2008, 10:09 PM
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Try unplugging the red hose from the wastegate on the turbo and make a few runs to see what kind of boost it will make then.

Do you have an overboost eliminator of some sort?

Do you have any intake mods? The stock intake is restrictive. The more restrictive the intake, the less boost it can make.

My two guesses are a boost leak or the the PCM is defueling due to the boost pressure. I know it will make more boost with the wastegate umplugged as well. You should be seeing more than 20psi, that is for sure.

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post #3 of 18 Old 01-07-2008, 10:14 PM Thread Starter
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Ya I have a boost fooler. One of the valves that you set. Its set at 21psi. I am doing the DIY tymar next week. Whats odd is before I installed the boost fooler I would Defuel with the chip so I know It can make more power. Im trying to think where it could be leaking at? Maybe the plastic T that they sent me? When the truck shifts I hear a tsss sound alot as well. PLus my truck is making a humming noise under the hood at idle with the brake pressed. Im thinking I need a fuel filter too


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post #4 of 18 Old 01-07-2008, 10:24 PM
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Quote:
Originally Posted by toddy View Post
Ya I have a boost fooler. One of the valves that you set. Its set at 21psi. I am doing the DIY tymar next week. Whats odd is before I installed the boost fooler I would Defuel with the chip so I know It can make more power. Im trying to think where it could be leaking at?Check every boot, maybe even take them off, wash them and inspect them for holes. I had one that had a hole in it on the driverside on the bottom. It was a cut about 1/2" long so they do hide from you Maybe the plastic T that they sent me? When the truck shifts I hear a tsss sound alot as well.Again makes me think there is a leak PLus my truck is making a humming noise under the hood at idle with the brake pressed.Check you power steering fluid level. Mine humms when it is low and I press on the brake. The PS pump is used for the brakes(hydroboost) Im thinking I need a fuel filter too
You put the gauge in line between the valve and the intake?

Not between the valve and the MAP sensor, correct?

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post #5 of 18 Old 01-07-2008, 10:27 PM Thread Starter
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Corrects. Its before the valve


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post #6 of 18 Old 01-08-2008, 02:26 PM Thread Starter
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I pulled the line on the waste gate and now Im hitting about 24. Im gonna put the tymar on this weekend so maybe we'll see more after that. thanks for the help and Il update this weekend


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post #7 of 18 Old 01-08-2008, 02:58 PM
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a wastegated turbo, i could only hit 25, i clamped the wastegate shut, and now i can hit 32

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post #8 of 18 Old 01-08-2008, 03:05 PM Thread Starter
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what do you mean by clamped the waste gate shut?


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post #9 of 18 Old 01-08-2008, 05:57 PM
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you can either use a turnbuckle, or do it through vacuum on the line going to the wastegate actuator, but just trying to accomplish keeping the wastegate shut,

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post #10 of 18 Old 01-08-2008, 08:40 PM
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Quote:
Originally Posted by powerstrokin250 View Post
a wastegated turbo, i could only hit 25, i clamped the wastegate shut, and now i can hit 32
Banks big head or turbo master wastegate controller will do the same and still function as designed. I think the wastegate is there for a reason, to keep the turbo from dying prematurely. 32psi will kill a turbo in short order, it only took me 3 months at that boost level. Keep it around 25 and it will live a long and prosperous life.


My $.02

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