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Old 08-06-2020, 11:12 PM   #1
Savoelh
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Missing: BOOST - if found please post here -

I have found an interesting / complex problem with my turbo frs.

The set up: 10.5 to 1 iag block with precision 5558 turbo as well as an external waste gate by precision. Tuned by delicious

The problem: Not boosting past a certain threshold
The specifics: 91 will not go past 3 psi. E85 with not go past 6 psi (at 1 time it would go up to 7 or 8 but that doesn't happen anymore)

I have a boost controller but I have bypassed it by running the vacuum tube from the turbo to the top of the waste gate. Here I get the same psi as I do when everything is hooked up correctly.3 psi on 91 and 6 psi on e85. My waste gate spring is 6 pounds.

Here's the interesting part. When the vacuum tube is routed into the boost controller / waste gate correctly BUT the vacuum tube has been removed from the turbo the car boosts just fine. I have seen it go up to 16 psi on e85.

What I have done: I have replaced the boost controller as well as the ECU. My tuner is 100% sure that it has nothing to do with the tune. My mechanic says it's not a vacuum leak.

Things you should know: The last thing I did to the car before all of this happened was that I replaced the auto transmission with a manual. That means both front chassis wire and the dash wire harness were replaced. So was the ECU and the abs module. The vacuum tube from the brake booster was routed into the intake manifold as that's how I saw it done on a stock version of our cars.

The question: why does the car boost just fine with the vacuum tube disconnected from the turbo but poorly when everything is routed correctly? Any ideas on what to check next?
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Old 08-10-2020, 06:44 PM   #2
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This probably belongs in the Forced Induction section.
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Old 08-10-2020, 07:47 PM   #3
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I found it! but it escaped out the blow off valve!
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Old 08-10-2020, 07:55 PM   #4
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The line you speak of is pressure to diaphragm to push the waste gate open. I would replace your waste gate actuator next. I would also re-verify you lines are “routed correct”.
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Old 08-10-2020, 10:26 PM   #5
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Quote:
Originally Posted by solidsnake11 View Post
I found it! but it escaped out the blow off valve!
I have noticed that the bov is always fluttering. But it would be a tune issue if that were the case. I have been considering having someone else tune it
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Old 08-10-2020, 10:56 PM   #6
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I have noticed that the bov is always fluttering. But it would be a tune issue if that were the case. I have been considering having someone else tune it
It was a joke
Missing: BOOST - if found please post here -

I found it! but it escaped out the blow off valve!
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Old 08-10-2020, 11:13 PM   #7
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How many ports does the boost controler have? How many lines are going to your waste gate? Did you change exhaust? Did you take waste gate off while changing transmission?
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Old 08-14-2020, 09:19 AM   #8
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Can you share a picture of how your vacuum lines are routed into your boost controller? Is it a standalone boost controller or a boost control solenoid plugged into your EVAP connection?
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Old 08-14-2020, 10:28 PM   #9
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Hey guys thanks for the input. It's a 3 port boost controller. One port is atmosphere. 1 goes to the cold side of the turbo and the 1 goes to the top of the waste gate.

I have been told that the map sensor seems to be malfunctioning by my tuner so that's the direction I'm headed. It doesn't make sense to me but thats the only direction I have atm. I'll post again once it's been installed.
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Old 08-17-2020, 11:49 PM   #10
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The map sensor was reading low pressure. Problem resolved.
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