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Old 10-01-2002, 05:27 PM   #1
PeterJ
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2002 impreza RS

Question boost tank

Do you guys think that it could be possible to somehow save the pressure released by the blow off valve in a tank or something? Then it might be possible to dump it back in during acceleration while the turbo is spooling up. The same thing might be possible with the exhaust gasses from the wastegate, but Im not sure it would work as well.
If you are running 20 psi, and 25psi would be unsafe but achievable with your turbo, then why not divert the extra 5psi into something where you can save it for later. Then you would have 25 psi in a tank that you could release while youre at 10psi and waiting for pressure to build. I guess the tank would have to be large... Any thoughts?
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Old 10-01-2002, 06:04 PM   #2
PunKidd
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Default

I don't think that is going to work. Say you run the BOV into the tank... in order to pressurize the tank the pipe that the BOV is supposed to release pressure from would have to remain pressurized. If they are connected, as soon as the pipe pressure dropped then the tank pressure would have to drop as well. If the tank pressure did not drop then the pipe pressure would not drop either and the BOV would do no good.
Same goes w/ the WG.
Maybe if you had some type of BOV that actually switched the throttle body over to an air filter, and diverted the pressure over to the tank, but if you did that then the shock wave from the BOV switching over would damage the turbo, and once again the BOV would be pointless. The whole point of the BOV is to RELISE the pressure in order to minimize the load on the turbo, using the turbo to pressurize a static volume could not be good for the turbo.
One last problem is that even if you could pressurize a tank it would help very little. The volume of air that the engine sucks in is quite large. In order to keep the manifold pressurized it requires a very large volume of air and in turn it would require a huge tank to keep it pressurized for any useful amount of time.
Physics is a pain isn't it?
-Jared.
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Old 10-01-2002, 06:05 PM   #3
yebokmj
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Default Anti-lag

There is a system that is similar in idea and already in use. It's called anti-lag do a search for exact details.
Joshua
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Old 10-01-2002, 07:12 PM   #4
PeterJ
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The anti-lag does work, but it works on a different principal. I was wondering about conserving pressure that was being wasted; most anti-lag systems that I know of temporarily retard the timing and dump raw fuel into the exhaust manifold, creating a fireball to quickly spool up the turbo once the throttle is re-opened. Im thinking that somehow the turbo could keep creating pressure and the excess could be saved somewhere for later. But you guys are correct in saying that it is difficult; I guess someone would have done it already...
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Old 10-01-2002, 10:08 PM   #5
PunKidd
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Close.
An anti-lag system actually just keeps air moving through the engine even when the TB is all the way closed. As long as there is air still moving through the engine there will be air moving through the turbine and keeping the turbo spooled up. In order to keep the engine from revving up it pulls all the timing, and gives it gobs of extra gas. The fireball in the exhaust is just a side effect of the extra gas. Anti-lag can be dangerous to run. W/ all the extra gas burning in the exhaust it takes the EGTs way up there. Defiantly not something that you want to run around town.
-Jared.
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