| Boost Bypass Valve Mod | |
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+9charlieRobinson deekster_caddy Rickw robotennis61 Mr.Riviera T Riley AA NO 4 EVR jax95riv 13 posters |
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jax95riv Aficionado
Name : Jack Age : 62 Location : Oklahoma City Joined : 2007-01-14 Post Count : 1062 Merit : 6
| Subject: Boost Bypass Valve Mod Wed Feb 07, 2007 1:05 pm | |
| I may have missed it on our forum, but I was reading on another forum about the Boost Bypass Valve Mod...Is that for both Series I and II engines? Worth doing?
http://www3.sympatico.ca/aepa/bypassvalve.html | |
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NO 4 EVR Addict
Name : Troy Age : 39 Location : Sylvania, OH (Toledo) Joined : 2007-01-26 Post Count : 645 Merit : 1
| Subject: Re: Boost Bypass Valve Mod Wed Feb 07, 2007 1:19 pm | |
| Some people do it, but most think it is not worth it. Unless you have a tuner it may be harmful. Something about not having enough fuel to match the air coming in I think. | |
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AA Administrator
Name : Aaron Age : 47 Location : C-bus, Ohio Joined : 2007-01-13 Post Count : 18452 Merit : 252
| Subject: Re: Boost Bypass Valve Mod Wed Feb 07, 2007 1:32 pm | |
| Personally, I wouldn't do it. Doesn't make sense to me why you would want more boost down low. We already have a gob of torque even at 2k RPM. I'm still spinning at 35 mph after a launch. The Series I makes its peak torque even lower than the Series II, so I'm guessing if you did it, you'd be breaking tires loose much easier, chirping tires at shifts... sounds cool, but bad on transmission, imo. Having said that, I've never tried it... it's only my opinion. _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30 3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
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T Riley Guru
Name : Travis Age : 34 Location : Minnesconsin Joined : 2007-02-08 Post Count : 5127 Merit : 10
| Subject: Re: Boost Bypass Valve Mod Thu Feb 08, 2007 10:26 pm | |
| hmmmmmm i read this but i have a series !! and i just dont understand thsi i kno where the bypass valve is but nvr took it off wouldnt it be cool to have a blow off valve LOL jk but what am i doing taking off the bypass valve and putting it back on>>>??? well how much HP is that or how much more boost ??? | |
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jax95riv Aficionado
Name : Jack Age : 62 Location : Oklahoma City Joined : 2007-01-14 Post Count : 1062 Merit : 6
| Subject: Re: Boost Bypass Valve Mod Fri Feb 09, 2007 12:01 pm | |
| I did mine last night. Sometimes it acts like the timing is being retarded when I floor it (sort of like a hesitation, but not really)...sometimes it launches very well. I dunno what the dealio is... I may change it back and see if it fixes it. | |
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T Riley Guru
Name : Travis Age : 34 Location : Minnesconsin Joined : 2007-02-08 Post Count : 5127 Merit : 10
| Subject: Re: Boost Bypass Valve Mod Fri Feb 09, 2007 3:45 pm | |
| - jax95riv wrote:
- I did mine last night. Sometimes it acts like the timing is being retarded when I floor it (sort of like a hesitation, but not really)...sometimes it launches very well. I dunno what the dealio is... I may change it back and see if it fixes it.
so did it feel as though u gained any sort of power?? | |
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Mr.Riviera Expert
Name : Matthew Age : 38 Location : Florida Joined : 2007-01-17 Post Count : 4394 Merit : 101
| Subject: Re: Boost Bypass Valve Mod Fri Feb 09, 2007 3:49 pm | |
| you cant gain any power wiht the BBV mod, only change when you get into + boost #'s. at WOT you still make the same power and boost. this is not a mod i recomend doing, kinda like the MAF screen removal...some ppl have problems. _________________ 1996 with 254k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP AMG C400 White on black. Stage 2 w/E30 - 11.9@117 -daily | |
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jax95riv Aficionado
Name : Jack Age : 62 Location : Oklahoma City Joined : 2007-01-14 Post Count : 1062 Merit : 6
| Subject: Re: Boost Bypass Valve Mod Sun Feb 11, 2007 10:58 pm | |
| OK question...I notice a bog since I moved the valve. But, I've also noticed more low to mid range torque for lack of a better word...Is the bog because I'm not pulling enough air into the engine to keep up? Will the FWI I'm getting ready to do tomorrow help this? Or am I just WAY off base? Or do you recommend I just change it back? | |
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AA Administrator
Name : Aaron Age : 47 Location : C-bus, Ohio Joined : 2007-01-13 Post Count : 18452 Merit : 252
| Subject: Re: Boost Bypass Valve Mod Mon Feb 12, 2007 12:08 am | |
| One of the problems with not having a scanner is that you are modding "blind". The hesitation you feel could very well be retarding of timing, and that can be a result of KR. The BBV mod has been known to cause "flash KR", which could create the symptoms you are seeing.
Another thing you may want to consider is what this is going to do to your fuel economy. With boost kicking in sooner, your car will be burning a lot more gas with a lot less pedal.
I still haven't tried this, so not saying it's all bad, but I'd be scanning very carefully if I did. If it was something for nothing I'd think they'd have set it differently from the factory. _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30 3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
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robotennis61 Guru
Name : robotennis Age : 63 Location : las vegas Joined : 2007-12-17 Post Count : 5562 Merit : 143
| Subject: Re: Boost Bypass Valve Mod Sun Jun 28, 2009 4:19 am | |
| mr. riv wrote: MAF screen removal...some ppl have problems. maf screen? is that the throttle body debris screen? | |
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Rickw Guru
Name : Rick Location : Lancaster, MA Joined : 2008-09-13 Post Count : 6282 Merit : 119
| Subject: Re: Boost Bypass Valve Mod Sun Jun 28, 2009 7:18 am | |
| - robotennis61 wrote:
- mr. riv wrote: MAF screen removal...some ppl have problems. maf screen? is that the throttle body debris screen?
That is not a debris screen, it monitors/measures the amount of air passing into the throttle body. | |
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deekster_caddy Master
Name : Derek Age : 52 Location : Reading, MA Joined : 2007-01-31 Post Count : 7717 Merit : 109
| Subject: Re: Boost Bypass Valve Mod Sun Jun 28, 2009 9:28 am | |
| The screen doesn't measure anything, but it straightens out airflow so the MAF can function properly. Take it away and you'll get some wild MAF readings which can make you rich or lean or anywhere in between...
And to anyone who rereads this and considers it, do NOT do the "BBV Mod", it's useless and gives you a mid throttle KR spike. | |
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Rickw Guru
Name : Rick Location : Lancaster, MA Joined : 2008-09-13 Post Count : 6282 Merit : 119
| Subject: Re: Boost Bypass Valve Mod Sun Jun 28, 2009 9:38 am | |
| Thanks for the correction regarding the function of the screen. Not enough coffee at time of post. That's my story and I'm sticking to it.!!!!!! | |
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charlieRobinson Expert
Name : Charlie Age : 39 Location : Knoxville, TN Joined : 2011-05-17 Post Count : 3924 Merit : 31
| Subject: Re: Boost Bypass Valve Mod Tue Nov 22, 2011 10:05 pm | |
| http://www.fastfieros.com/tech/boost_solenoid_bypass_mod.htm I have been reading all about what the boost control actuator really does. Has anyone ever seen or experienced themselves negative effects from doing this? - Quote :
- Boost Solenoid ByPass mod
Why even do it? Two reasons in my opinion. First and most important, does it hurt the engine, or help the engine? Its really there to relieve the NOISE of the supercharger... Striaght from Eaton's website > > Are superchargers noisy? The Eaton supercharger system incorporates a specially designed bypass valve, which is actuated by a vacuum motor near the throttle body and recalculates the supercharger air flow when boost is not required. During typical driving conditions, the engine is under boost around 5% of the time, which means the remaining 95% of the time the engine is under vacuum, allowing for better fuel economy and a quieter ride. In addition, the helix angled rotors, along with specially designed inlet and outlet port geometry, also reduce pressure variations resulting in a smooth discharge flow and a lower level of noise during operation. Careful attention to the techniques used in installing the supercharger also plays a major role in reducing the noise emitted by the supercharger. | |
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DEMonte1997 Aficionado
Name : Rick Age : 46 Location : CT Joined : 2009-03-03 Post Count : 1429 Merit : 37
| Subject: Re: Boost Bypass Valve Mod Tue Nov 22, 2011 10:54 pm | |
| Never read that before but....
I tried the BBV adjustment mod eons ago and although the car felt torquey at low throttle around town, it took a nasty hit or KR which ultimately killed performance at higher rpms and with quick stabs of the go pedal. This was in my Regal. I thought about doing it in the Riv just because it almost never sees boost but realized it could be fatal to the motor. My belief is putting the valve all the way down does not allow for as much if any boost to be bled off so the PCM has a heck of a time adjusting fueling and keeping up with it when you drop the hammer.
I ended up adjusting it all the way up. No more odd KR spikes. MUCH better. | |
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deekster_caddy Master
Name : Derek Age : 52 Location : Reading, MA Joined : 2007-01-31 Post Count : 7717 Merit : 109
| Subject: Re: Boost Bypass Valve Mod Wed Nov 23, 2011 10:31 am | |
| I have tuned cars with the BBV "mod" and you need to readjust the timing table a lot bit to avoid some medium throttle KR spikes. If you do that, then it works - you get "quicker" boost. But in all reality the valve opens so quick anyway there is really no gain to this. It's a stupid "mod", don't waste your time, leave it where it belongs. Your performance will be better in the long run for having the valve open later. It still opens just as much when you step on it. | |
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AA Administrator
Name : Aaron Age : 47 Location : C-bus, Ohio Joined : 2007-01-13 Post Count : 18452 Merit : 252
| Subject: Re: Boost Bypass Valve Mod Wed Nov 23, 2011 10:43 am | |
| Agree 100% with previous two posts. I'm repeating myself, but it's not like we need any more low-end torque than we already have. Our throttle response is near the very best - it's one of those things the 3800 SC does very well, even stock. No, I haven't actually done the mod, but this is one of those things, when you think about what it really does, it just doesn't make sense. No reason to try it.
PS - I disagree with the quoted link on the previous page that says the BBV valve is mostly for noise control. Changing its operation could impact fuel economy, and driveability. And as mentioned, it could produce dangerous KR. Besides, if we assumed it was just for suppressing blower whine, then adjusting it obviously cannot improve performance!
_________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30 3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
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matt270avian Expert
Name : Matt Age : 28 Location : Frederick, MD Joined : 2012-01-15 Post Count : 2681 Merit : 54
| Subject: Re: Boost Bypass Valve Mod Mon Nov 04, 2013 6:59 pm | |
| Was just searching around and I found this.
http://www.zzperformance.com/blog/boost-bypass-mod-free-mod/
Anybody? I'll be a guinea pig on this one. | |
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AA Administrator
Name : Aaron Age : 47 Location : C-bus, Ohio Joined : 2007-01-13 Post Count : 18452 Merit : 252
| Subject: Re: Boost Bypass Valve Mod Mon Nov 04, 2013 7:06 pm | |
| Already stated my opinion above and on page 1. There's no good reason to do it.
ZZP: "It also helps some cars achieve full boost that were having problems with the bypass not closing all the way during WOT."
Or... replace your bad BBV with one that works! _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30 3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
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turtleman Expert
Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08 Post Count : 3671 Merit : 140
| Subject: Re: Boost Bypass Valve Mod Wed Nov 06, 2013 1:31 am | |
| Basically, re-biasing the boost bypass valve isn't doing anything for throttle response that you couldn't replicate by pressing the gas a little more, but based off what Derek is saying, it can hurt so I would just say don't. | |
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ironclyde Enthusiast
Name : Cody Age : 62 Location : Tucson Joined : 2014-01-19 Post Count : 156 Merit : 1
| Subject: Re: Boost Bypass Valve Mod Mon Jan 20, 2014 2:41 pm | |
| I think using a smaller pulley maybe a better solution. You won't change the nature of the valve operation. However, when the boost is needed you'll have a little more of it. | |
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