What is boost bypass?
thanks!
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From: Cookeville, TN
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From: Milford, Ohio USA
WOOOOOT!
That link is to the largest steaming pile I've ever seen!
The boost bypass circuit in the Lightning does nothing but to, strangely enough, BYPASS the supercharger during part-throttle (light-load) conditions where boost is not needed. This improves fuel mileage substantially (honest!) and reduces heat buildup.
As a holder of a Master's Degree in Chemical Enginnering with my thesis in the area of fluid mechanics and heat transfer, I LOVE TO DEATH the way that a wide variety of know-nothings latch onto and throw oround *****-nilly the term "cavitation", with a VEEEEEERY OBVIOUS complete lack of understanding of the term. A ridiculously ignorant usage, in this context.
The kit sold by this and any number of other part hawkers does not affect, IN ANY WAY, the boost bypass circuit, and you can thank your lucky stars for that. What a bunch of ignorant, marketing-driven knuckleheads.
The affected circuit is the BOOST DUMP circuit. This is a failsafe circuit that cuts the boost completely when you, typically, do something stupid ar otherwise uncharitable to the drivetrain (most notably, bash the shizznit out of the rev limiter while doing a burnout in the water boxes). This circuit is there for a reason. Defeating it may not blow you up, or even have the slightest negative effect, but...
GET AT LEAST A SLIGHT UNDERSTANDING OF WHAT YOU ARE ALTERING (DEFEATING), BEFORE YOU DISCUSS (OR BETTER, A D V E R T I S E) A RIDICULOUSLY OVERPRICED PRODUCT!
The boost bypass circuit in the Lightning does nothing but to, strangely enough, BYPASS the supercharger during part-throttle (light-load) conditions where boost is not needed. This improves fuel mileage substantially (honest!) and reduces heat buildup.
As a holder of a Master's Degree in Chemical Enginnering with my thesis in the area of fluid mechanics and heat transfer, I LOVE TO DEATH the way that a wide variety of know-nothings latch onto and throw oround *****-nilly the term "cavitation", with a VEEEEEERY OBVIOUS complete lack of understanding of the term. A ridiculously ignorant usage, in this context.
The kit sold by this and any number of other part hawkers does not affect, IN ANY WAY, the boost bypass circuit, and you can thank your lucky stars for that. What a bunch of ignorant, marketing-driven knuckleheads.
The affected circuit is the BOOST DUMP circuit. This is a failsafe circuit that cuts the boost completely when you, typically, do something stupid ar otherwise uncharitable to the drivetrain (most notably, bash the shizznit out of the rev limiter while doing a burnout in the water boxes). This circuit is there for a reason. Defeating it may not blow you up, or even have the slightest negative effect, but...
GET AT LEAST A SLIGHT UNDERSTANDING OF WHAT YOU ARE ALTERING (DEFEATING), BEFORE YOU DISCUSS (OR BETTER, A D V E R T I S E) A RIDICULOUSLY OVERPRICED PRODUCT!
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From: Milford, Ohio USA
Wait....
Meditate on this, Chief....
Like Forrest said...
Stupid Is As Stupid Does...
(Not directed at you in any way)...
This is a fundamental, simple circuit in the Lighting, yet AT LEAST 90% of threads/posts on this topic FIVE YEARS OUT from the introduction of this vehicle (with NO modification of the citcuit) are TOTALLY, ridiculously, laughably, WRONG!
Baffling.
Like Forrest said...
Stupid Is As Stupid Does...
(Not directed at you in any way)...
This is a fundamental, simple circuit in the Lighting, yet AT LEAST 90% of threads/posts on this topic FIVE YEARS OUT from the introduction of this vehicle (with NO modification of the citcuit) are TOTALLY, ridiculously, laughably, WRONG!
Baffling.
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Joined: Jun 2000
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From: Milford, Ohio USA
DING DING DING!
0328:
DAMN RIGHT!
You defeated the boost dump. You now have taken on the VERY slight risk that you might greande your engine due to a 70000000 RPM excursion in the water boxes or while showing off for Ellie Mae at cruise night, but you have, 100%, eliminated the possibility of blasting off a zero-PSI-16-second-pass on grudge night and ripping the test-and-tune-glory from your grasp.
Look - you understand the tech. My post does not concern you.
I was blasting the unwashed masses.
DAMN RIGHT!
You defeated the boost dump. You now have taken on the VERY slight risk that you might greande your engine due to a 70000000 RPM excursion in the water boxes or while showing off for Ellie Mae at cruise night, but you have, 100%, eliminated the possibility of blasting off a zero-PSI-16-second-pass on grudge night and ripping the test-and-tune-glory from your grasp.
Look - you understand the tech. My post does not concern you.
I was blasting the unwashed masses.
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From: San Diego, CA
Yeah, I know, I wasn't bashing you either, just messing around!
Basicly I made my decision to do it off of some searching I did on here, it seemed like a good thing to do and I never heard anything bad about it untill now. What I had head is taht doing the actuall mod (the RPMoutlet.com) way is bad, but just unplugging the solenoid is ok. If this is wrong, leme know why and I'll plug it back in, I know I don't know everything, and I rely on what I hear in here to make some of my decisions because there's alot more experience here than I have!!
-dennis
Basicly I made my decision to do it off of some searching I did on here, it seemed like a good thing to do and I never heard anything bad about it untill now. What I had head is taht doing the actuall mod (the RPMoutlet.com) way is bad, but just unplugging the solenoid is ok. If this is wrong, leme know why and I'll plug it back in, I know I don't know everything, and I rely on what I hear in here to make some of my decisions because there's alot more experience here than I have!!
-dennis
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From: Milford, Ohio USA
Well....
The Downside seems to be nil, but I suppose the there WAS a reason for Ford to include that circuit, right ?
The Upside is the elimination (ONLY, it seems) to prevent 30 seconds of low-compression F150 Hell if you do something retarded (no apologies to the mentally challenged) in the water box, which you SHOULD AVOID ANYWAY.
This can also be made irrevant if you have your chip properly set up - that is - your REV LIMITER set appropriately above your SHIFT POINT.
I've hit the dump ONCE, and that was only because I wore my hockey helmet by mistake to the drag strip.
The Upside is the elimination (ONLY, it seems) to prevent 30 seconds of low-compression F150 Hell if you do something retarded (no apologies to the mentally challenged) in the water box, which you SHOULD AVOID ANYWAY.
This can also be made irrevant if you have your chip properly set up - that is - your REV LIMITER set appropriately above your SHIFT POINT.
I've hit the dump ONCE, and that was only because I wore my hockey helmet by mistake to the drag strip.
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From: San Diego, CA
I'm sure (I hope) there was a reason for the circuit to be there...the reasons I heard were to dump boost after burnouts (see below)
But I never heard it was directly related to hitting the rev limiter.
I've read that the PCM will dump boost if it 'sees' braking applied (Brake Tourqe) while at WOT (burnouts). heres a link to what I'm talking about..
https://www.f150online.com/forums/sh...ghlight=bypass
But I never heard it was directly related to hitting the rev limiter.
I've read that the PCM will dump boost if it 'sees' braking applied (Brake Tourqe) while at WOT (burnouts). heres a link to what I'm talking about..
https://www.f150online.com/forums/sh...ghlight=bypass
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From: Richmond, VA, USA
I believe that the PCM also dumps boost via the solenoid (which is disabled either way by unplugging it (electrically) or boost bypass mod(physically removing vacuum supply) when it sees other dangerous conditions.
such as OVERHEATING engine, or excessively high IAT2.
it is a failsafe to help protect your engine.
BTW, I have had mine dump in the middle of a run (without making a mistake in a burnout and it sucks) 15.something @ 84mph!
the boost bypass vacuum mod is a joke and is totally un-necessary.
just unplug the solenoid and live with the "soft" code, it doesn't illuminate the light.
my .02
later,
chris
such as OVERHEATING engine, or excessively high IAT2.
it is a failsafe to help protect your engine.
BTW, I have had mine dump in the middle of a run (without making a mistake in a burnout and it sucks) 15.something @ 84mph!
the boost bypass vacuum mod is a joke and is totally un-necessary.
just unplug the solenoid and live with the "soft" code, it doesn't illuminate the light.
my .02
later,
chris
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From: San Diego, CA
Check this thread out, it has a pic...
https://www.f150online.com/forums/sh...t=boost+bypass
-dennis
https://www.f150online.com/forums/sh...t=boost+bypass
-dennis
