Cheap supercharger kit: Part II
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Teching In
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From: Oregon
Joined: Apr 2006
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From: Grand Rapids, Michigan
@turtlefab8 This forum is 25 years old. I've been on it for 20 of those years. It's not being unfriendly to tell someone that they've resurrected an old thread. The point is, half the people who started these old threads are no longer participating on the forum, and bringing it to the top again serves no purpose. However, that's not the case here. @Pocket is still active from what I can see, so he may chime in, now that I've alerted him. If you want to get a members attention in a thread, simply type the @ symbol followed by their screen name ( no space between ). Welcome to the site, you aren't going to find another LS oriented page with the wealth of knowledge contained here.
Teching In
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@LS1Formulation I thought replying to a post would alert the member, I didn't realize the @ was necessary so thank you for explaining that. I looked at Pockets profile before I posted and saw that he was still active, that's why I brought this old thread back. thanks!
did this require a BOV or did the bypass valve serve that purpose?
Teching In
Joined: Jan 2026
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No sorry, the M122 kit was only ran briefly before going to a Techco 3.0L supercharger
On the initial M90, a BOV was attempted before switching to an external bypass valve. The M122 had an internal bypass valve to regulate unneeded pressure. With the gift of experience, I'd suggest only using BOVs on undersized SC's, centrifugal blowers and turbos. Large PD blowers require a bypass valve of some sort
On the initial M90, a BOV was attempted before switching to an external bypass valve. The M122 had an internal bypass valve to regulate unneeded pressure. With the gift of experience, I'd suggest only using BOVs on undersized SC's, centrifugal blowers and turbos. Large PD blowers require a bypass valve of some sort
air filter - blower - BOV? - intercooler - TB - stock intake manifold.
Part of the problem is that the search function isn't all that great. If you do a word search it brings up al kinds of non related threads. So sometimes it's better to start a new thread asking questions that have been asked hundreds of times. What oil is best for my LS1 and so on and so forth.
On a typical PD blower, the TB is closed most of the time so only a minor amount of air seeps by. This creates a near vacuum behind the TB, so the blower has almost no air to compress, thus no noise. When winding out an engine, the TB is open, so the blower gets ample air to compress and thus the whine, but the engine RPM is also pretty high and changing so the sound changes as the blower goes in and out of efficiency range
With the side mount unit I built, the TB is downstream, so the blower perpetually has all the air it can use. The BPV kept the boost level manageable outside of spirited driving, but the blower was always compressing air. Since the air speed/boost was relatively static, the whine was also an ear splitting mono-tone
To counter that, the TB needed to be moved to the SC inlet. Simple to do, but the problem would become an absurd increase in plenum volume. The SC, all pipes, the IC and actual intake would be plenum volume and since the volume wasn't uniform, it was impossible to tune. Atleast the tuner I used couldn't get anything usable from it like that
I'm not sure what SC you're planning to use, but swap the BOV for a BPV and it should be viable
