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Old 04-16-2007, 02:25 PM
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Boost Problems

I have a 97 F250 with 137000. It has an edge evo. 3" downpipe, diy intake. I recently installed a boost gauge shortly after the downpipe and I think it is showing a problem. The boost gauge flutters from 5 lbs on and once it gets to about 15 it flickers so bad you cant read it. Also noticed that turbo almost sounds like the boost is blowing out of the intake and like a blow off valve when I let off throttle. I have tested the gauge, ruled out the ebpv, cleaned and checked the y pipe and couplings. I am completely lost. Sorry about writing a book here, just trying to be as informative about the problem as possible. Boost reference is off of map sensor, also tried to use y pipe but same result.
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Old 04-17-2007, 05:20 AM
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Quote:
Originally Posted by racejunkie93 View Post
............ I recently installed a boost gauge shortly after the downpipe and I think it is showing a problem. .........
The downpipe is where the exhaust exits the turbo and connects to your exhaust pipe. This is not where the boost gauge should be installed. Boost is the amount of pressure that the compressor can develop. Normally boost gauges are installed in the Y-pipe or MAP line.

If you have the gauge installed in the downpipe, you are measuring exhaust backpressure, not boost and it will have a flutter to it as it passes through the turbo exhaust fins.
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Old 04-17-2007, 05:23 AM
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Quote:
Originally Posted by racejunkie93 View Post
I have a 97 F250 with 137000. It has an edge evo. 3" downpipe, diy intake. I recently installed a boost gauge shortly after the downpipe and I think it is showing a problem. The boost gauge flutters from 5 lbs on and once it gets to about 15 it flickers so bad you cant read it. Also noticed that turbo almost sounds like the boost is blowing out of the intake and like a blow off valve when I let off throttle. I have tested the gauge, ruled out the ebpv, cleaned and checked the y pipe and couplings. I am completely lost. Sorry about writing a book here, just trying to be as informative about the problem as possible. Boost reference is off of map sensor, also tried to use y pipe but same result.
Was everything working properly prior to the gauge installed.
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Old 04-17-2007, 05:27 AM
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Boost reference is off of map sensor, also tried to use y pipe but same result.[/QUOTE]

Ok so you have hooked up the boost gauge both ways. How did you hook up to the Y pipe. Did you drill and tap a hole and insert a fitting and then run a line for the guage.

I am thinking that you have a leak at one of the couplings for the tubes comming off the turbo and going to the intercooler. It could be the coupling at the inlet of the intercooler. Or you may have to replace the coupling for the cac tube coming off the Y at the turbo. I had to do this as well when I installed my boost gauge. I had to get a new coupling for the cac tube. It cost me around 30 bucks at the local Ford Dealership.
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Old 04-17-2007, 03:14 PM
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Quote:
Originally Posted by racejunkie93 View Post
I have a 97 F250 with 137000. It has an edge evo. 3" downpipe, diy intake. I recently installed a boost gauge shortly after the downpipe and I think it is showing a problem. The boost gauge flutters from 5 lbs on and once it gets to about 15 it flickers so bad you cant read it. Also noticed that turbo almost sounds like the boost is blowing out of the intake and like a blow off valve when I let off throttle. I have tested the gauge, ruled out the ebpv, cleaned and checked the y pipe and couplings. I am completely lost. Sorry about writing a book here, just trying to be as informative about the problem as possible. Boost reference is off of map sensor, also tried to use y pipe but same result.
I think I read this wrong as well, he mentions "guage installed shortly after the downpipe" I think he meants he hooked up a boost gauge (to a credible non-exhaust reading source) right after he installed a new downpipe, correct?
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Old 04-17-2007, 04:13 PM
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Quote:
Originally Posted by Lord Tauk View Post
I think I read this wrong as well, he mentions "guage installed shortly after the downpipe" I think he meants he hooked up a boost gauge (to a credible non-exhaust reading source) right after he installed a new downpipe, correct?
That is how I am reading it. I believe he installed the down pipe, and now trying to install a boost gauge. I think his problem is the coupling boots on the cac tubes are not sealing.
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Old 04-17-2007, 05:14 PM
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Guess I read it wrong.
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Old 04-17-2007, 05:20 PM
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Sorry about that. The shortly after part was in reference to the time line. I have a 97 and it is not intercooled. I did drill and tap the y pipe. The problem started around the same time as gauge install. All of the boost sounds like it is coming out of the air filter. In between shifts(automatic) and when I let off of the throttle it sounds like a blow off valve. Today I put on a 2000 hpop and new pressure regulator not that that was the problem but wanted to upgrade.
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Old 04-17-2007, 05:21 PM
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The cac tube is the metal y pipe that comes off turbo and feeds air to intake?
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Old 04-17-2007, 05:24 PM
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Actually the cac tube is what runs from the intercooler to the y-pipe.
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