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the question is, is there going to be a new redline?

 

i doubt that there will be.
and it wont be a pontiac cuz if i remember right there trying to push pontiac to all rwd.
lets hope the ss/tc stays just chevy

 

Sorry, not bypass valve, the car has a surgevalve that dumps excess boost into the intake when you shift, reducing spool time. It is actually built into the casing of the turbo. It kinda sounds like a BOV just a lot quieter, but they say adding a CAI increases the noise.

Pay attention to what the Sol/Sky guys are doing. All the manual GXP/RL's who have added a BOV have had problems with CELs and have zero increase in power. The automatic transmission actually doesn't throw codes or cause problems, but kinda pointless because the turbo doesn't lose boost when the auto shifts. The auto sol/skys that added a bov did it just for the sound, but it does nothing.

Most of the Sol/Sky guys get up to 21psi if they hammer before 1000 miles, but it levels out to about 19psi after that. Depending on weather, some see 20psi every once in a while.

 

There would be no reason to see a power increase with a blow off valve as a BOV does nothing to add or free up power. The only thing a BOV does is release pressure on the intake side of the turbo so that you don't get compressor surge and warp the fins.

 

Exactly.

Archie,
You were right, it's called a recirculating bypass valve but it has nothing to do with spool timing. That's why I said "que?"

 

I was under the impression that a BOV helps to spool the turbo faster between shifts causing an increase in off throttle power.

But I'm new to turbos, and I'm trying to catch up as quick as I can.

ahhh. and the turbo master speaks. I was hoping you would bail me out sooner or later.

 

If it was rwd or awd and not a GM car, I may consider it.

 

It's alright

Like said, a blow off valve or bypass valve is just used to dropped air pressure in the charge pipes. Picture the throttle plate closing shut, the pressurized air will hit the plate and might revurt backwards...to the turbocharger. Turbochargers are designed to spin in 1 direction, not 2. It would be a opposing force against the compressor wheel blades/fins. It could cause all type of issues.

Also it's needed regardless the type of transmission you have cause no matter what, if you get into boost pressure and release off the gas, this can happen. It's not upon when you shift but upon when you release off the gas/throttle.

 

the only time a bov will gain power is when you have exceeded the spring pressure of it.

they will not pick up power otherwise. the primary goal of the bov, or bypass valve is to save the turbo from compressor surge. nothing more.

 

not sure if this was asked yet, but how much will the new cobalt ss/tc be?

 

eleventy billion doallars!

 

**** i learn so much from this site. wewt. Keep it coming guys

 

a gm maf with a maf translator box will solve the CEL and will allow you to run an atmospheric blow off valve without powerloss or lag when you shift because the box allows you to slightly tune for different rpm ranges to adjust for the lack of the compressed air running back into the airbox (which must be capped off if you remove the recirculatory blow off valve). ive dealt with this problem on 4 of my friends cars that have a maf with a turbo and that solved the lag in power after shifting and CEL's for their cars. i dont know bout the sol/sky but it would prob do the same. altho if anyone ends up getting one of these i highly suggest taking it to a tuner to tune it cuz they are nothing short of a bitch to tune and took me a few hours my very first time with my friends talon tsi

 

if you are venting a bov on a dsm you're effin stupid. you gain nothing by doing this but noise. you gain no power by doing this. "the noise is cool" no it's not. if you want noise, go buy an srt4 and do the mopar sneeze mod.

 

Yeah, I've just seen on certain turbo vehicle forums "how much hp will I gain from xxx BOV?!!11!one!!" So naturally, I made the connection BOV=HP.

However, I do know that the K04 turbo surgevalve cannot simply be removed, due to the fact that the surgevalve is part of the turbo casing. It is possible that it may be tuned closed, but we would probably need HPT help for that.

 

was not my car so i didnt care for any of it. i get paid to do work for friends so i do it. simple as that. if it were my car, it would run back to the intake, my friend is the *******. altho slowboy racing has a rwd eclipse drag car that runs a blowoff atmospheric... so it mustnt be that stupid

are you talking to me on the k04 turbo and that junk???

 

Yep, you weren't sure if you could take off the surge valve on the stock Sol/sky turbo, the K04. Answer is you cannot.

But it might be possible to tune it shut. Just depends on how in depth HPT is with their tuning programming.