Boost bypass mod - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance When the race track beckons, find out how to mod your car, supercharge your GM engine, and start "Winning"

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Old 03-30-2011, 12:58 PM   #1
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Default Boost bypass mod

This is a free mod. This may, or may not have any effect on your car, it all depends on how the bypass is set. This simply adjusts the boost bypass to shorten it'* travel a bit. So you may see a bit more boost sooner.

First locate the boost bypass valve.


Use a 10mm wrench to loosen the bolts holding the valve in place, one on top.


And the other further down. Only loosen these, do not remove them.


Now adjust the valve down a little bit, and then tighten both bolts.


And your done.
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Old 03-09-2012, 11:38 AM   #2
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Default Boost Control

Or , if you really want to control your Boost go to the junk yard and find an electric vacumun control. Most later model GM cars have them. It will have three vacumun outlets. One at one end and two at the other. You have to test it to see which end allows the vacumun to pass thru and which one blocks it when power is applied. Next find the vacumun line that controls the pull-off solinoid and cut it. Put the switch into the line. Wire it to a switch and you have total control over you boost.When it is on you have boost all the time and when it is off the boost is controled by the pull-off.
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Old 03-09-2012, 12:35 PM   #3
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Originally Posted by 63viking View Post
Or , if you really want to control your Boost go to the junk yard and find an electric vacumun control. Most later model GM cars have them. It will have three vacumun outlets. One at one end and two at the other. You have to test it to see which end allows the vacumun to pass thru and which one blocks it when power is applied. Next find the vacumun line that controls the pull-off solinoid and cut it. Put the switch into the line. Wire it to a switch and you have total control over you boost.When it is on you have boost all the time and when it is off the boost is controled by the pull-off.
This has the ability to chip pistons and destroy the transmission much easier than allowing the pcm to control it.
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Old 03-09-2012, 06:59 PM   #4
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Have been running this way for three years and NO problems.
AND, MY car is not in bits and pieces on the garage floor.
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Old 03-09-2012, 08:38 PM   #5
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For a engine running on the raged edge where the tune needs to be adjusted by the season, or even changes in temp. Best to let the PCM deal with it. A engine that has a looser tune this my be OK.
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Old 03-09-2012, 10:36 PM   #6
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Originally Posted by Danthurs View Post
For a engine running on the raged edge where the tune needs to be adjusted by the season, or even changes in temp. Best to let the PCM deal with it. A engine that has a looser tune this my be OK.
My engine still isn't in bits and pieces on the garage floor.
And for your information my looser tune runs 11.50 consistantly.
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Old 03-10-2012, 12:35 PM   #7
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Forget just one time to turn the boost off when you should, and you may be singing a different tune.
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Old 03-11-2012, 01:10 PM   #8
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There are so many "NICE" people on the forum, I don't know why more people don't partake in it. Could it be a "GOD" attitude????
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Old 03-11-2012, 01:55 PM   #9
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Everyone is free to mod their car as they see fit. My way isn't the only way. And this is why we talk about things. Different attitudes come up with different ideas. I like the idea. But for the average person, I suggest not using it. For someone that watches their engine and how it performs, this is an option.
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Old 03-23-2012, 06:51 PM   #10
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Cool

My looser tune has been running on the street and strip for three years now with NO "Chipped Pistons" NO Destroyed Transmissions.
I know my times are slow compared to all of yours, but with my old reaction times (I'm 75yrs old) it still manages 11:50s consistantly. My son who is a bit younger manages to rip off a few 11"10s & 11"15s. By the way the car weighs in at 3270lbs.
Also, letting the PMC control your boost is like giving grandma the gas petal and you get the rest. If the General meant for you to have max HP he would have put in a manual controller. All he was interested in was your money and NO PROBLEMS..
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