I just tested this on my bone stock sc. I removed and plugged the rear hose to the solenoid. I did several back to back stints with the car stock and with the bypass in place. Stock: The wheelspin is a problem, not as much power in top range rpm's. Bypass enabled: Car launched with much more traction(didn't have a timer to see if it was faster this way) but felt better off the line. Biggest diff was at higher speeds. Honestly I was suprised at how hard the car pulled from 40-125 it was definately much faster. Just thought I would share my experiment I know many wonder about this method!

 

???how???

 

click ME, and allllll your questions will be answered my friend
its actually quite easy

 

When I did it, I did not notice anything....but then again I didn't notice my exhaust either

 

this will NOT help on a stock pulley. the pulley is only designed to give 12.5psi. the mod is for when u swap to a smaller pulley and boost more than 12.5. the mod prevents the extra psi to stay in the system.

 

Can someone please awnser me this....Is it bad to leave the bypass mod done for daily driving? I heard it was because it's putting the supercharger under "constant load"?????

 

Doesn't put any extra strain on the sc. It still idles and drives like it did without the plug. It definately does provide a noticable difference in my experience. I know people have had mixed results.

 

Does stage 1 resolve this issue? WIth stage 1 is there any need for this mod? I was told the Stage 1 lets you hold boost longer up to 16 psi, am I wrong?

 

again, on a stock pulley, you will NOT get any gains from this

 

It must do something because I could def feel the diff. It seems to enable the sc to boost quicker and longer than with it off. I was not a believer, but it did make the sc kick more at full throttle.

 

its in ur head. the only thing this mod does is when your boosting 12.5+ psi, it retains the extra psi not causing it to bleed off. it doesnt do anything else but that. so if your still on a stock pulley boosting 12.5psi, this mod does nothing

 

Why is it that with the line unpluged and blocked that the car behaves differently? Just trying to figure out exactly what the results im experiencing are? Thanks

 

This has always been considered a useless mod for the L67. I tried it and decided it was no difference and anything I felt was in my head (optimism). I don't see why it would be much different for the LSJ... but I'm willing to accept that it works better maybe... I'm sure I'll try it some day.

 

you shouldnt experience a difference with a stock setup.

.... inhales reasoning is that "its all in your head"....
i would like to think otherwise but test again and make sure u truely feel a difference.

what elevation are you running at?
the reason i ask this is because im running at nearly 7,000ft and i only run 11 pounds of boost if im lucky. if your are passing the 12.5 standard for some reason, things would make a bit more sense

 

I was running the car in Niagara Falls Ontario elevation??? I tested back to back as stated above and there was a difference not in my head its a fact. All I was trying to do was let people know it did make a diff in my case. I have heard people say it made them slower and made them faster.

 

if u are boosting more than 12.5psi on a stock pulley...have the car checked out at GM because your cat might be clogged

 

I found that the by-pass valve does not actually kick in until about 15psi or 103kpa.
that's where it kicks in for my and drops me back to stock level at 85kpa about 12.5psi

 

Switched it back, started to make a poping noise.

 

yeah but why with the stage 2 we dont have to do the by pass mods to boost more....whats the deal??

 

if u swap to an aftermarket pulley (bigger than the stock 3.4"), you will create more boost. stock pulley boosts 12.5psi. now if your running a smaller pulley, you WILL boost more. i believe a 3" pulley gives u 16psi. now when ur WOT with the 3" pulley, youll make 16psi up to 6k rpms. after that, the psi will drop down to stock 12.5psi. the boost bypass mod lets the extra boost stay in the system. it prevents it from bleeding out of the system.

 

i think your wrong because i try a cobalt ss stg 2 without the boost by pass mod and the boost reach 115kpa without droping at all...

 

Stage 2 Cobalt has a ECM reflash to allow for more boost.

 

I had my 3 inch installed today. Don't have the boost bypass mod done. It doesn't seem to drop. If it does, it's not very noticeable. I even stared at the boost gauge for one run and didn't seem to drop until I hit the rev limiter which did go back down to 12.5. But when I don't hit the limiter, it usually won't fall all the way down to 12.5....but then again the gauge can be slow as well.