If a plug is blown out of the head. Would the resulting decrease in backpressure result in an instantaneous increase in boost?
Would the resultant drop in Delta P result in a surge from the blower. Does the bypass pop at a given pressure or only for say an overheated tranny? Physics..what is that?

 

Since boost pressure is a result of restriction in the air path of the motor, I would think if you open a cylinder up you would see less boost since you'd be bleeding pressure off. Just a theoretical speculation.

 

Ah..the old decrease in pressure...increase in velocity thing....

What about the bypass...if in service...will it relieve at a given setpoint or only when the ECM parameters dictate ?
Is there any situation that could increase boost pressure beyond normal parameters..say spike the boost? I know I`m a dumb ***...

Say Sal..the truck is running great.Hope to dyno it again soon.

 

Great!!!


The bypass is simply a mechanically diaphram. Open with vacuum, closed with boost. A drop in boost will still keep the by pass closed as long as boost doesn't drop off 100%, goin back to a vacuum state. The PCM does not read boost, so there is nothing "boost related" that could cause the PCM to dump boost based on boost pressure. As for spiking boost beyond normal, as I said before, boost is caused by air path restrcition, so you'd need something blocking the airpath to cause boost to go up, and I'd think that would have to be somekind of mechanical failure which would be more permanent like clogged exhaust.

 

So..the boost bypass is strictly a device to lowerr parasitic drag from the blower when not in boost? Other than that why would Ford monitor the boost pressure? Just as a tattletale? They planned on using this to void warranties? Should`nt they be up front and tell folks that this is their intent?
I`m bored today.....grin

 

i told them my kid keeps sticking baking potatos in my pipes, and thats the reason for my 16.5psi readings. i think they bought it

 

Nooo...there is NO WAY for the PCM to monitor boost pressure. There is no sensor that does such a thing. There is no way for Ford or a dealer to know how much boost has been put through a motor.

The by pass is there to allow air to by pass the rotors when not under load. If there was no bypass, the rotors would be heating the air charge all the time, and it's also not healthy for the blower to not by pass air on hard decel. Ask any Mustang owner who's had a Kenne Bell. The KB 1500 has no bypass and you can cook your dinner on it. But the KB 2200 has one, and those have no overheating issues.

Try a quick search on the subject, I did a pretty detailed post not long ago about the bypass, boost solenoid, and how they work.

 

So..Maybe I should run with this plugged in? I would never loose boost when I`m in the throttle? It is otherwise beneficial? Just how far can I launch those little red new potatos from the bazzoka tubes? I have seen posts and my dealer told me they knew it was unplugged. A couple codes have been posted ..indicitive of overboost....If I spray the potatoes with W-40 will they go father? lmao

MRBBQMAN

Have you patented the potato, potato sound?

 

Jeff, it sounds like you might be talking about two seperate things. The by pass valve and the boost dump solenoid are two different things, with two different functions. Do a search for that post I made about how it all works and you'll find detailed answers.

 

I tried but, 2 Harley representitives showed up on my doorstep, and advised against it, then spit on my Valkyrie as they left.

 

How dare they Oh Lightning Lord of Nawlins....